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Description

Elegant iOS form builder in Swift

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Eureka: Elegant form builder in Swift

Build status Platform iOS Swift 5 compatible Carthage compatible CocoaPods compatible License: MIT codebeat badge

Made with ❤️ by XMARTLABS. This is the re-creation of XLForm in Swift.

简体中文

Overview

Contents

For more information look at our blog post that introduces Eureka.

Requirements (for latest release)

  • Xcode 11+
  • Swift 5.0+

Example project

You can clone and run the Example project to see examples of most of Eureka's features.

Usage

How to create a form

By extending

FormViewController
you can then simply add sections and rows to the
form
variable.
import Eureka

class MyFormViewController: FormViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    form +++ Section("Section1")
        <<< TextRow(){ row in
            row.title = "Text Row"
            row.placeholder = "Enter text here"
        }
        <<< PhoneRow(){
            $0.title = "Phone Row"
            $0.placeholder = "And numbers here"
        }
    +++ Section("Section2")
        <<< DateRow(){
            $0.title = "Date Row"
            $0.value = Date(timeIntervalSinceReferenceDate: 0)
        }
}

}

In the example we create two sections with standard rows, the result is this:

Screenshot of Custom Cells

You could create a form by just setting up the

form
property by yourself without extending from
FormViewController
but this method is typically more convenient.

Configuring the keyboard navigation accesory

To change the behaviour of this you should set the navigation options of your controller. The

FormViewController
has a
navigationOptions
variable which is an enum and can have one or more of the following values:
  • disabled: no view at all
  • enabled: enable view at the bottom
  • stopDisabledRow: if the navigation should stop when the next row is disabled
  • skipCanNotBecomeFirstResponderRow: if the navigation should skip the rows that return false to
    canBecomeFirstResponder()

The default value is

enabled & skipCanNotBecomeFirstResponderRow

To enable smooth scrolling to off-screen rows, enable it via the

animateScroll
property. By default, the
FormViewController
jumps immediately between rows when the user hits the next or previous buttons in the keyboard navigation accesory, including when the next row is off screen.

To set the amount of space between the keyboard and the highlighted row following a navigation event, set the

rowKeyboardSpacing
property. By default, when the form scrolls to an offscreen view no space will be left between the top of the keyboard and the bottom of the row.
class MyFormViewController: FormViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    form = ...

// Enables the navigation accessory and stops navigation when a disabled row is encountered
navigationOptions = RowNavigationOptions.Enabled.union(.StopDisabledRow)
// Enables smooth scrolling on navigation to off-screen rows
animateScroll = true
// Leaves 20pt of space between the keyboard and the highlighted row after scrolling to an off screen row
rowKeyboardSpacing = 20
}

}

If you want to change the whole navigation accessory view, you will have to override the

navigationAccessoryView
variable in your subclass of
FormViewController
.

Getting row values

The

Row
object holds a value of a specific type. For example, a
SwitchRow
holds a
Bool
value, while a
TextRow
holds a
String
value.
// Get the value of a single row
let row: TextRow? = form.rowBy(tag: "MyRowTag")
let value = row.value

// Get the value of all rows which have a Tag assigned // The dictionary contains the 'rowTag':value pairs. let valuesDictionary = form.values()

Operators

Eureka includes custom operators to make form creation easy:

+++       Add a section

form +++ Section()

// Chain it to add multiple Sections form +++ Section("First Section") +++ Section("Another Section")

// Or use it with rows and get a blank section for free form +++ TextRow() +++ TextRow() // Each row will be on a separate section

<<<       Insert a row

form +++ Section()
        <<< TextRow()
        <<< DateRow()

// Or implicitly create the Section form +++ TextRow() <<< DateRow()

+=        Append an array

// Append Sections into a Form
form += [Section("A"), Section("B"), Section("C")]

// Append Rows into a Section section += [TextRow(), DateRow()]

Using the callbacks

Eureka includes callbacks to change the appearance and behavior of a row.

Understanding Row and Cell

A

Row
is an abstraction Eureka uses which holds a value and contains the view
Cell
. The
Cell
manages the view and subclasses
UITableViewCell
.

Here is an example:

let row  = SwitchRow("SwitchRow") { row in      // initializer
                        row.title = "The title"
                    }.onChange { row in
                        row.title = (row.value ?? false) ? "The title expands when on" : "The title"
                        row.updateCell()
                    }.cellSetup { cell, row in
                        cell.backgroundColor = .lightGray
                    }.cellUpdate { cell, row in
                        cell.textLabel?.font = .italicSystemFont(ofSize: 18.0)
                }

Screenshot of Disabled Row

Callbacks list

  • onChange()

    Called when the value of a row changes. You might be interested in adjusting some parameters here or even make some other rows appear or disappear.

  • onCellSelection()

    Called each time the user taps on the row and it gets selected.

  • cellSetup()

    Called only once when the cell is first configured. Set permanent settings here.

  • cellUpdate()

    Called each time the cell appears on screen. You can change the appearance here using variables that may not be present on cellSetup().

  • onCellHighlightChanged()

Called whenever the cell or any subview become or resign the first responder.

  • onRowValidationChanged()

    Called whenever the the validation errors associated with a row changes.

  • onExpandInlineRow()

Called before expanding the inline row. Applies to rows conforming

InlineRowType
protocol.
  • onCollapseInlineRow()

Called before collapsing the inline row. Applies to rows conforming

InlineRowType
protocol.
  • onPresent()

    Called by a row just before presenting another view controller. Applies to rows conforming

    PresenterRowType
    protocol. Use it to set up the presented controller.

Section Header and Footer

You can set a title

String
or a custom
View
as the header or footer of a
Section
.

String title

Section("Title")

Section(header: "Title", footer: "Footer Title")

Section(footer: "Footer Title")

Custom view

You can use a Custom View from a

.xib
file:
Section() { section in
    var header = HeaderFooterView(.nibFile(name: "MyHeaderNibFile", bundle: nil))

// Will be called every time the header appears on screen
header.onSetupView = { view, _ in
    // Commonly used to setup texts inside the view
    // Don't change the view hierarchy or size here!
}
section.header = header

}

Or a custom

UIView
created programmatically
Section(){ section in
    var header = HeaderFooterView(.class)
    header.height = {100}
    header.onSetupView = { view, _ in
        view.backgroundColor = .red
    }
    section.header = header
}

Or just build the view with a Callback

swift
Section(){ section in
    section.header = {
          var header = HeaderFooterView(.callback({
              let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
              view.backgroundColor = .red
              return view
          }))
          header.height = { 100 }
          return header
        }()
}

Dynamically hide and show rows (or sections)

Screenshot of Hidden Rows

In this case we are hiding and showing whole sections.

To accomplish this each row has a

hidden
variable of optional type
Condition
which can be set using a function or
NSPredicate
.

Hiding using a function condition

Using the

function
case of
Condition
:
swift
Condition.function([String], (Form)->Bool)
The array of
String
to pass should contain the tags of the rows this row depends on. Each time the value of any of those rows changes the function is reevaluated. The function then takes the
Form
and returns a
Bool
indicating whether the row should be hidden or not. This the most powerful way of setting up the
hidden
property as it has no explicit limitations of what can be done.
form +++ Section()
            <<< SwitchRow("switchRowTag"){
                $0.title = "Show message"
            }
            <<< LabelRow(){

            $0.hidden = Condition.function(["switchRowTag"], { form in
                return !((form.rowBy(tag: "switchRowTag") as? SwitchRow)?.value ?? false)
            })
            $0.title = "Switch is on!"
    }

Screenshot of Hidden Rows

public enum Condition {
    case function([String], (Form)->Bool)
    case predicate(NSPredicate)
}

Hiding using an NSPredicate

The

hidden
variable can also be set with a NSPredicate. In the predicate string you can reference values of other rows by their tags to determine if a row should be hidden or visible. This will only work if the values of the rows the predicate has to check are NSObjects (String and Int will work as they are bridged to their ObjC counterparts, but enums won't work). Why could it then be useful to use predicates when they are more limited? Well, they can be much simpler, shorter and readable than functions. Look at this example:
$0.hidden = Condition.predicate(NSPredicate(format: "$switchTag == false"))

And we can write it even shorter since

Condition
conforms to
ExpressibleByStringLiteral
:
$0.hidden = "$switchTag == false"

Note: we will substitute the value of the row whose tag is 'switchTag' instead of '$switchTag'

For all of this to work, all of the implicated rows must have a tag as the tag will identify them.

We can also hide a row by doing:

swift
$0.hidden = true
as
Condition
conforms to
ExpressibleByBooleanLiteral
.

Not setting the

hidden
variable will leave the row always visible.
Sections

For sections this works just the same. That means we can set up section

hidden
property to show/hide it dynamically.
Disabling rows

To disable rows, each row has an

disabled
variable which is also an optional
Condition
type property. This variable also works the same as the
hidden
variable so that it requires the rows to have a tag.

Note that if you want to disable a row permanently you can also set

disabled
variable to
true
.

List Sections

To display a list of options, Eureka includes a special section called

SelectableSection
. When creating one you need to pass the type of row to use in the options and the
selectionType
. The
selectionType
is an enum which can be either
multipleSelection
or
singleSelection(enableDeselection: Bool)
where the
enableDeselection
parameter determines if the selected rows can be deselected or not.
form +++ SelectableSection>("Where do you live", selectionType: .singleSelection(enableDeselection: true))

let continents = ["Africa", "Antarctica", "Asia", "Australia", "Europe", "North America", "South America"] for option in continents { form.last! <<< ListCheckRow(option){ listRow in listRow.title = option listRow.selectableValue = option listRow.value = nil } }

What kind of rows can be used?

To create such a section you have to create a row that conforms the

SelectableRowType
protocol.
public protocol SelectableRowType : RowType {
    var selectableValue : Value? { get set }
}

This

selectableValue
is where the value of the row will be permanently stored. The
value
variable will be used to determine if the row is selected or not, being 'selectableValue' if selected or nil otherwise. Eureka includes the
ListCheckRow
which is used for example. In the custom rows of the Examples project you can also find the
ImageCheckRow
.
Getting the selected rows

To easily get the selected row/s of a

SelectableSection
there are two methods:
selectedRow()
and
selectedRows()
which can be called to get the selected row in case it is a
SingleSelection
section or all the selected rows if it is a
MultipleSelection
section.
Grouping options in sections

Additionally you can setup list of options to be grouped by sections using following properties of

SelectorViewController
:
  • sectionKeyForValue
    - a closure that should return key for particular row value. This key is later used to break options by sections.
  • sectionHeaderTitleForKey
    - a closure that returns header title for a section for particular key. By default returns the key itself.
  • sectionFooterTitleForKey
    - a closure that returns footer title for a section for particular key.

Multivalued Sections

Eureka supports multiple values for a certain field (such as telephone numbers in a contact) by using Multivalued sections. It allows us to easily create insertable, deletable and reorderable sections.

Screenshot of Multivalued Section

How to create a multivalued section

In order to create a multivalued section we have to use

MultivaluedSection
type instead of the regular
Section
type.
MultivaluedSection
extends
Section
and has some additional properties to configure multivalued section behavior.

let's dive into a code example...

form +++
    MultivaluedSection(multivaluedOptions: [.Reorder, .Insert, .Delete],
                       header: "Multivalued TextField",
                       footer: ".Insert adds a 'Add Item' (Add New Tag) button row as last cell.") {
        $0.addButtonProvider = { section in
            return ButtonRow(){
                $0.title = "Add New Tag"
            }
        }
        $0.multivaluedRowToInsertAt = { index in
            return NameRow() {
                $0.placeholder = "Tag Name"
            }
        }
        $0 <<< NameRow() {
            $0.placeholder = "Tag Name"
        }
    }

Previous code snippet shows how to create a multivalued section. In this case we want to insert, delete and reorder rows as multivaluedOptions argument indicates.

addButtonProvider
allows us to customize the button row which inserts a new row when tapped and
multivaluedOptions
contains
.Insert
value.

multivaluedRowToInsertAt
closure property is called by Eureka each time a new row needs to be inserted. In order to provide the row to add into multivalued section we should set this property. Eureka passes the index as closure parameter. Notice that we can return any kind of row, even custom rows, even though in most cases multivalued section rows are of the same type.

Eureka automatically adds a button row when we create a insertable multivalued section. We can customize how the this button row looks like as we explained before.

showInsertIconInAddButton
property indicates if plus button (insert style) should appear in the left of the button, true by default.

There are some considerations we need to have in mind when creating insertable sections. Any row added to the insertable multivalued section should be placed above the row that Eureka automatically adds to insert new rows. This can be easily achieved by adding these additional rows to the section from inside the section's initializer closure (last parameter of section initializer) so then Eureka adds the adds insert button at the end of the section.

Editing mode

By default Eureka will set the tableView's

isEditing
to true only if there is a MultivaluedSection in the form. This will be done in
viewWillAppear
the first time a form is presented.

For more information on how to use multivalued sections please take a look at Eureka example project which contains several usage examples.

Custom add button

If you want to use an add button which is not a

ButtonRow
then you can use
GenericMultivaluedSection
, where
AddButtonType
is the type of the row you want to use as add button. This is useful if you want to use a custom row to change the UI of the button.

Example:

GenericMultivaluedSection(multivaluedOptions: [.Reorder, .Insert, .Delete], {
    $0.addButtonProvider = { section in
        return LabelRow(){
            $0.title = "A Label row as add button"
        }
    }
    // ...
}

Validations

Eureka 2.0.0 introduces the much requested built-in validations feature.

A row has a collection of

Rules
and a specific configuration that determines when validation rules should be evaluated.

There are some rules provided by default, but you can also create new ones on your own.

The provided rules are: * RuleRequired * RuleEmail * RuleURL * RuleGreaterThan, RuleGreaterOrEqualThan, RuleSmallerThan, RuleSmallerOrEqualThan * RuleMinLength, RuleMaxLength * RuleClosure

Let's see how to set up the validation rules.

override func viewDidLoad() {
        super.viewDidLoad()
        form
          +++ Section(header: "Required Rule", footer: "Options: Validates on change")

        &lt;&lt;&lt; TextRow() {
            $0.title = "Required Rule"
            $0.add(rule: RuleRequired())

    // This could also have been achieved using a closure that returns nil if valid, or a ValidationError otherwise.
    /*
    let ruleRequiredViaClosure = RuleClosure<string> { rowValue in
    return (rowValue == nil || rowValue!.isEmpty) ? ValidationError(msg: "Field required!") : nil
    }
    $0.add(rule: ruleRequiredViaClosure)
    */

            $0.validationOptions = .validatesOnChange
        }
        .cellUpdate { cell, row in
            if !row.isValid {
                cell.titleLabel?.textColor = .systemRed
            }
        }

      +++ Section(header: "Email Rule, Required Rule", footer: "Options: Validates on change after blurred")

        &lt;&lt;&lt; TextRow() {
            $0.title = "Email Rule"
            $0.add(rule: RuleRequired())
            $0.add(rule: RuleEmail())
            $0.validationOptions = .validatesOnChangeAfterBlurred
        }
        .cellUpdate { cell, row in
            if !row.isValid {
                cell.titleLabel?.textColor = .systemRed
            }
        }

As you can see in the previous code snippet we can set up as many rules as we want in a row by invoking row's

add(rule:)
function.

Row also provides

func remove(ruleWithIdentifier identifier: String)
to remove a rule. In order to use it we must assign an id to the rule after creating it.

Sometimes the collection of rules we want to use on a row is the same we want to use on many other rows. In this case we can set up all validation rules using a

RuleSet
which is a collection of validation rules.
var rules = RuleSet()
rules.add(rule: RuleRequired())
rules.add(rule: RuleEmail())

let row = TextRow() { $0.title = "Email Rule" $0.add(ruleSet: rules) $0.validationOptions = .validatesOnChangeAfterBlurred }

Eureka allows us to specify when validation rules should be evaluated. We can do it by setting up

validationOptions
row's property, which can have the following values:
  • .validatesOnChange
    - Validates whenever a row value changes.
  • .validatesOnBlur
    - (Default value) validates right after the cell resigns first responder. Not applicable for all rows.
  • .validatesOnChangeAfterBlurred
    - Validates whenever the row value changes after it resigns first responder for the first time.
  • .validatesOnDemand
    - We should manually validate the row or form by invoking
    validate()
    method.

If you want to validate the entire form (all the rows) you can manually invoke Form

validate()
method.

How to get validation errors

Each row has the

validationErrors
property that can be used to retrieve all validation errors. This property just holds the validation error list of the latest row validation execution, which means it doesn't evaluate the validation rules of the row.

Note on types

As expected, the Rules must use the same types as the Row object. Be extra careful to check the row type used. You might see a compiler error ("Incorrect arugment label in call (have 'rule:' expected 'ruleSet:')" that is not pointing to the problem when mixing types.

Swipe Actions

By using swipe actions we can define multiple

leadingSwipe
and
trailingSwipe
actions per row. As swipe actions depend on iOS system features,
leadingSwipe
is available on iOS 11.0+ only.

Let's see how to define swipe actions.

let row = TextRow() {
            let deleteAction = SwipeAction(
                style: .destructive,
                title: "Delete",
                handler: { (action, row, completionHandler) in
                    //add your code here.
                    //make sure you call the completionHandler once done.
                    completionHandler?(true)
                })
            deleteAction.image = UIImage(named: "icon-trash")

        $0.trailingSwipe.actions = [deleteAction]
        $0.trailingSwipe.performsFirstActionWithFullSwipe = true

        //please be aware: `leadingSwipe` is only available on iOS 11+ only
        let infoAction = SwipeAction(
            style: .normal,
            title: "Info",
            handler: { (action, row, completionHandler) in
                //add your code here.
                //make sure you call the completionHandler once done.
                completionHandler?(true)
            })
        infoAction.actionBackgroundColor = .blue
        infoAction.image = UIImage(named: "icon-info")

        $0.leadingSwipe.actions = [infoAction]
        $0.leadingSwipe.performsFirstActionWithFullSwipe = true
    }

Swipe Actions need

tableView.isEditing
be set to
false
. Eureka will set this to
true
if there is a MultivaluedSection in the form (in the
viewWillAppear
). If you have both MultivaluedSections and swipe actions in the same form you should set
isEditing
according to your needs.

Custom rows

It is very common that you need a row that is different from those included in Eureka. If this is the case you will have to create your own row but this should not be difficult. You can read this tutorial on how to create custom rows to get started. You might also want to have a look at EurekaCommunity which includes some extra rows ready to be added to Eureka.

Basic custom rows

To create a row with custom behaviour and appearance you'll probably want to create subclasses of

Row
and
Cell
.

Remember that

Row
is the abstraction Eureka uses, while the
Cell
is the actual
UITableViewCell
in charge of the view. As the
Row
contains the
Cell
, both
Row
and
Cell
must be defined for the same value type.
// Custom Cell with value type: Bool
// The cell is defined using a .xib, so we can set outlets :)
public class CustomCell: Cell, CellType {
    @IBOutlet weak var switchControl: UISwitch!
    @IBOutlet weak var label: UILabel!

public override func setup() {
    super.setup()
    switchControl.addTarget(self, action: #selector(CustomCell.switchValueChanged), for: .valueChanged)
}

func switchValueChanged(){
    row.value = switchControl.on
    row.updateCell() // Re-draws the cell which calls 'update' bellow
}

public override func update() {
    super.update()
    backgroundColor = (row.value ?? false) ? .white : .black
}

}

// The custom Row also has the cell: CustomCell and its correspond value public final class CustomRow: Row, RowType { required public init(tag: String?) { super.init(tag: tag) // We set the cellProvider to load the .xib corresponding to our cell cellProvider = CellProvider(nibName: "CustomCell") } }

The result:
Screenshot of Disabled Row


Custom rows need to subclass

Row
and conform to
RowType
protocol. Custom cells need to subclass
Cell
and conform to
CellType
protocol.

Just like the callbacks cellSetup and CellUpdate, the

Cell
has the setup and update methods where you can customize it.

Custom inline rows

An inline row is a specific type of row that shows dynamically a row below it, normally an inline row changes between an expanded and collapsed mode whenever the row is tapped.

So to create an inline row we need 2 rows, the row that is "always" visible and the row that will expand/collapse.

Another requirement is that the value type of these 2 rows must be the same. This means if one row holds a

String
value then the other must have a
String
value too.

Once we have these 2 rows, we should make the top row type conform to

InlineRowType
. This protocol requires you to define an
InlineRow
typealias and a
setupInlineRow
function. The
InlineRow
type will be the type of the row that will expand/collapse. Take this as an example:
class PickerInlineRow : Row> where T: Equatable {

public typealias InlineRow = PickerRow<t>
open var options = [T]()

required public init(tag: String?) {
    super.init(tag: tag)
}

public func setupInlineRow(_ inlineRow: InlineRow) {
    inlineRow.options = self.options
    inlineRow.displayValueFor = self.displayValueFor
    inlineRow.cell.height = { UITableViewAutomaticDimension }
}

}

The

InlineRowType
will also add some methods to your inline row:
func expandInlineRow()
func collapseInlineRow()
func toggleInlineRow()

These methods should work fine but should you want to override them keep in mind that it is

toggleInlineRow
that has to call
expandInlineRow
and
collapseInlineRow
.

Finally you must invoke

toggleInlineRow()
when the row is selected, for example overriding
customDidSelect
:
public override func customDidSelect() {
    super.customDidSelect()
    if !isDisabled {
        toggleInlineRow()
    }
}

Custom Presenter rows

Note: A Presenter row is a row that presents a new UIViewController.

To create a custom Presenter row you must create a class that conforms the

PresenterRowType
protocol. It is highly recommended to subclass
SelectorRow
as it does conform to that protocol and adds other useful functionality.

The PresenterRowType protocol is defined as follows: ```swift public protocol PresenterRowType: TypedRowType {

 associatedtype PresentedControllerType : UIViewController, TypedRowControllerType

/// Defines how the view controller will be presented, pushed, etc. var presentationMode: PresentationMode? { get set }

/// Will be called before the presentation occurs. var onPresentCallback: ((FormViewController, PresentedControllerType) -> Void)? { get set }

} ```

The onPresentCallback will be called when the row is about to present another view controller. This is done in the

SelectorRow
so if you do not subclass it you will have to call it yourself.

The

presentationMode
is what defines how the controller is presented and which controller is presented. This presentation can be using a Segue identifier, a segue class, presenting a controller modally or pushing to a specific view controller. For example a CustomPushRow can be defined like this:

Let's see an example..

/// Generic row type where a user must select a value among several options.
open class SelectorRow: OptionsRow, PresenterRowType where Cell: BaseCell {


/// Defines how the view controller will be presented, pushed, etc.
open var presentationMode: PresentationMode<selectorviewcontroller>&gt;&gt;?

/// Will be called before the presentation occurs.
open var onPresentCallback: ((FormViewController, SelectorViewController<selectorrow>&gt;) -&gt; Void)?

required public init(tag: String?) {
    super.init(tag: tag)
}

/**
 Extends `didSelect` method
 */
open override func customDidSelect() {
    super.customDidSelect()
    guard let presentationMode = presentationMode, !isDisabled else { return }
    if let controller = presentationMode.makeController() {
        controller.row = self
        controller.title = selectorTitle ?? controller.title
        onPresentCallback?(cell.formViewController()!, controller)
        presentationMode.present(controller, row: self, presentingController: self.cell.formViewController()!)
    } else {
        presentationMode.present(nil, row: self, presentingController: self.cell.formViewController()!)
    }
}

/**
 Prepares the pushed row setting its title and completion callback.
 */
open override func prepare(for segue: UIStoryboardSegue) {
    super.prepare(for: segue)
    guard let rowVC = segue.destination as Any as? SelectorViewController<selectorrow>&gt; else { return }
    rowVC.title = selectorTitle ?? rowVC.title
    rowVC.onDismissCallback = presentationMode?.onDismissCallback ?? rowVC.onDismissCallback
    onPresentCallback?(cell.formViewController()!, rowVC)
    rowVC.row = self
}

}

// SelectorRow conforms to PresenterRowType public final class CustomPushRow<t: equatable>: SelectorRow>, RowType {

public required init(tag: String?) {
    super.init(tag: tag)
    presentationMode = .show(controllerProvider: ControllerProvider.callback {
        return SelectorViewController<t>(){ _ in }
        }, onDismiss: { vc in
            _ = vc.navigationController?.popViewController(animated: true)
    })
}

}

Subclassing cells using the same row

Sometimes we want to change the UI look of one of our rows but without changing the row type and all the logic associated to one row. There is currently one way to do this if you are using cells that are instantiated from nib files. Currently, none of Eureka's core rows are instantiated from nib files but some of the custom rows in EurekaCommunity are, in particular the PostalAddressRow which was moved there.

What you have to do is: * Create a nib file containing the cell you want to create. * Then set the class of the cell to be the existing cell you want to modify (if you want to change something more apart from pure UI then you should subclass that cell). Make sure the module of that class is correctly set * Connect the outlets to your class * Tell your row to use the new nib file. This is done by setting the

cellProvider
variable to use this nib. You should do this in the initialiser, either in each concrete instantiation or using the
defaultRowInitializer
. For example:
<<< PostalAddressRow() {
     $0.cellProvider = CellProvider(nibName: "CustomNib", bundle: Bundle.main)
}

You could also create a new row for this. In that case try to inherit from the same superclass as the row you want to change to inherit its logic.

There are some things to consider when you do this: * If you want to see an example have a look at the PostalAddressRow or the CreditCardRow which have use a custom nib file in their examples. * If you get an error saying

Unknown class  in Interface Builder file
, it might be that you have to instantiate that new type somewhere in your code to load it in the runtime. Calling
let t = YourClass.self
helped in my case.

Row catalog

Controls Rows

Label Row


Button Row


Check Row


Switch Row


Slider Row


Stepper Row


Text Area Row


Field Rows

These rows have a textfield on the right side of the cell. The difference between each one of them consists in a different capitalization, autocorrection and keyboard type configuration.

TextRow

NameRow

URLRow

IntRow

PhoneRow

PasswordRow

EmailRow

DecimalRow

TwitterRow

AccountRow

ZipCodeRow

All of the

FieldRow
subtypes above have a
formatter
property of type
NSFormatter
which can be set to determine how that row's value should be displayed. A custom formatter for numbers with two digits after the decimal mark is included with Eureka (
DecimalFormatter
). The Example project also contains a
CurrencyFormatter
which displays a number as currency according to the user's locale.

By default, setting a row's

formatter
only affects how a value is displayed when it is not being edited. To also format the value while the row is being edited, set
useFormatterDuringInput
to
true
when initializing the row. Formatting the value as it is being edited may require updating the cursor position and Eureka provides the following protocol that your formatter should conform to in order to handle cursor position:
public protocol FormatterProtocol {
    func getNewPosition(forPosition forPosition: UITextPosition, inTextInput textInput: UITextInput, oldValue: String?, newValue: String?) -> UITextPosition
}

Additionally,

FieldRow
subtypes have a
useFormatterOnDidBeginEditing
property. When using a
DecimalRow
with a formatter that allows decimal values and conforms to the user's locale (e.g.
DecimalFormatter
), if
useFormatterDuringInput
is
false
,
useFormatterOnDidBeginEditing
must be set to
true
so that the decimal mark in the value being edited matches the decimal mark on the keyboard.

Date Rows

Date Rows hold a Date and allow us to set up a new value through UIDatePicker control. The mode of the UIDatePicker and the way how the date picker view is shown is what changes between them.

Date Row
Picker shown in the keyboard.
Date Row (Inline)
The row expands.
Date Row (Picker)
The picker is always visible.

With those 3 styles (Normal, Inline & Picker), Eureka includes:

  • DateRow
  • TimeRow
  • DateTimeRow
  • CountDownRow

Option Rows

These are rows with a list of options associated from which the user must choose.

<<< ActionSheetRow() {
                $0.title = "ActionSheetRow"
                $0.selectorTitle = "Pick a number"
                $0.options = ["One","Two","Three"]
                $0.value = "Two"    // initially selected
            }
Alert Row

Will show an alert with the options to choose from.
ActionSheet Row

Will show an action sheet with the options to choose from.
Push Row

Will push to a new controller from where to choose options listed using Check rows.
Multiple Selector Row

Like PushRow but allows the selection of multiple options.
Segmented Row
Segmented Row (w/Title)
Picker Row

Presents options of a generic type through a picker view
(There is also Picker Inline Row)

Built your own custom row?

Let us know about it, we would be glad to mention it here. :)

  • LocationRow (Included as custom row in the example project)

Screenshot of Location Row

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects.

Specify Eureka into your project's

Podfile
:
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
use_frameworks!

pod 'Eureka'

Then run the following command:

$ pod install

Swift Package Manager

Swift Package Manager is a tool for managing the distribution of Swift code.

After you set up your

Package.swift
manifest file, you can add Eureka as a dependency by adding it to the dependencies value of your
Package.swift
.

dependencies: [ .package(url: "https://github.com/xmartlabs/Eureka.git", from: "5.3.2") ]

Carthage

Carthage is a simple, decentralized dependency manager for Cocoa.

Specify Eureka into your project's

Cartfile
:
github "xmartlabs/Eureka" ~> 5.3

Manually as Embedded Framework

  • Clone Eureka as a git submodule by running the following command from your project root git folder.
$ git submodule add https://github.com/xmartlabs/Eureka.git
  • Open Eureka folder that was created by the previous git submodule command and drag the Eureka.xcodeproj into the Project Navigator of your application's Xcode project.

  • Select the Eureka.xcodeproj in the Project Navigator and verify the deployment target matches with your application deployment target.

  • Select your project in the Xcode Navigation and then select your application target from the sidebar. Next select the "General" tab and click on the + button under the "Embedded Binaries" section.

  • Select

    Eureka.framework
    and we are done!

Getting involved

  • If you want to contribute please feel free to submit pull requests.
  • If you have a feature request please open an issue.
  • If you found a bug check older issues before submitting an issue.
  • If you need help or would like to ask general question, use StackOverflow. (Tag
    eureka-forms
    ).

Before contribute check the CONTRIBUTING file for more info.

If you use Eureka in your app We would love to hear about it! Drop us a line on twitter.

Authors

FAQ

How to change the text representation of the row value shown in the cell.

Every row has the following property:

/// Block variable used to get the String that should be displayed for the value of this row.
public var displayValueFor: ((T?) -> String?)? = {
    return $0.map { String(describing: $0) }
}

You can set

displayValueFor
according the string value you want to display.

How to get a Row using its tag value

We can get a particular row by invoking any of the following functions exposed by the

Form
class:
public func rowBy(tag: String) -> RowOf?
public func rowBy(tag: String) -> Row?
public func rowBy(tag: String) -> BaseRow?

For instance:

let dateRow : DateRow? = form.rowBy(tag: "dateRowTag")
let labelRow: LabelRow? = form.rowBy(tag: "labelRowTag")

let dateRow2: Row? = form.rowBy(tag: "dateRowTag")

let labelRow2: BaseRow? = form.rowBy(tag: "labelRowTag")

How to get a Section using its tag value

let section: Section?  = form.sectionBy(tag: "sectionTag")

How to set the form values using a dictionary

Invoking

setValues(values: [String: Any?])
which is exposed by
Form
class.

For example:

form.setValues(["IntRowTag": 8, "TextRowTag": "Hello world!", "PushRowTag": Company(name:"Xmartlabs")])

Where

"IntRowTag"
,
"TextRowTag"
,
"PushRowTag"
are row tags (each one uniquely identifies a row) and
8
,
"Hello world!"
,
Company(name:"Xmartlabs")
are the corresponding row value to assign.

The value type of a row must match with the value type of the corresponding dictionary value otherwise nil will be assigned.

If the form was already displayed we have to reload the visible rows either by reloading the table view

tableView.reloadData()
or invoking
updateCell()
to each visible row.

Row does not update after changing hidden or disabled condition

After setting a condition, this condition is not automatically evaluated. If you want it to do so immediately you can call

.evaluateHidden()
or
.evaluateDisabled()
.

This functions are just called when a row is added to the form and when a row it depends on changes. If the condition is changed when the row is being displayed then it must be reevaluated manually.

onCellUnHighlight doesn't get called unless onCellHighlight is also defined

Look at this issue.

How to update a Section header/footer

  • Set up a new header/footer data ....
section.header = HeaderFooterView(title: "Header title \(variable)") // use String interpolation
//or
var header = HeaderFooterView(.class) // most flexible way to set up a header using any view type
header.height = { 60 }  // height can be calculated
header.onSetupView = { view, section in  // each time the view is about to be displayed onSetupView is invoked.
    view.backgroundColor = .orange
}
section.header = header
  • Reload the Section to perform the changes
section.reload()

How to customize Selector and MultipleSelector option cells

selectableRowSetup
,
selectableRowCellUpdate
and
selectableRowCellSetup
properties are provided to be able to customize SelectorViewController and MultipleSelectorViewController selectable cells.
let row = PushRow() {
              $0.title = "PushRow"
              $0.options = [💁🏻, 🍐, 👦🏼, 🐗, 🐼, 🐻]
              $0.value = 👦🏼
              $0.selectorTitle = "Choose an Emoji!"
          }.onPresent { from, to in
              to.dismissOnSelection = false
              to.dismissOnChange = false
              to.selectableRowSetup = { row in
                  row.cellProvider = CellProvider>(nibName: "EmojiCell", bundle: Bundle.main)
              }
              to.selectableRowCellUpdate = { cell, row in
                  cell.textLabel?.text = "Text " + row.selectableValue!  // customization
                  cell.detailTextLabel?.text = "Detail " +  row.selectableValue!
              }
          }

Don't want to use Eureka custom operators?

As we've said

Form
and
Section
types conform to
MutableCollection
and
RangeReplaceableCollection
. A Form is a collection of Sections and a Section is a collection of Rows.

RangeReplaceableCollection
protocol extension provides many useful methods to modify collection.
extension RangeReplaceableCollection {
    public mutating func append(_ newElement: Self.Element)
    public mutating func append(contentsOf newElements: S) where S : Sequence, Self.Element == S.Element
    public mutating func insert(_ newElement: Self.Element, at i: Self.Index)
    public mutating func insert(contentsOf newElements: S, at i: Self.Index) where S : Collection, Self.Element == S.Element
    public mutating func remove(at i: Self.Index) -> Self.Element
    public mutating func removeSubrange(_ bounds: Range)
    public mutating func removeFirst(_ n: Int)
    public mutating func removeFirst() -> Self.Element
    public mutating func removeAll(keepingCapacity keepCapacity: Bool)
    public mutating func reserveCapacity(_ n: Self.IndexDistance)
}

These methods are used internally to implement the custom operators as shown bellow:

public func +++(left: Form, right: Section) -> Form {
    left.append(right)
    return left
}

public func +=(inout lhs: Form, rhs: C) where C.Element == Section { lhs.append(contentsOf: rhs) }

public func << Section { left.append(right) return left }

public func +=(inout lhs: Section, rhs: C) where C.Element == BaseRow { lhs.append(contentsOf: rhs) }

You can see how the rest of custom operators are implemented here.

It's up to you to decide if you want to use Eureka custom operators or not.

How to set up your form from a storyboard

The form is always displayed in a

UITableView
. You can set up your view controller in a storyboard and add a UITableView where you want it to be and then connect the outlet to FormViewController's
tableView
variable. This allows you to define a custom frame (possibly with constraints) for your form.

All of this can also be done by programmatically changing frame, margins, etc. of the

tableView
of your FormViewController.

Donate to Eureka

So we can make Eureka even better!

Change Log

This can be found in the CHANGELOG.md file.

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