SVPullToRefresh + SVInfiniteScrolling

These UIScrollView categories makes it super easy to add pull-to-refresh and infinite scrolling fonctionalities to any UIScrollView (or any of its subclass). Instead of relying on delegates and/or subclassing

UIViewController

UIScrollView

- (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler;
- (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler position:(SVPullToRefreshPosition)position;
- (void)addInfiniteScrollingWithActionHandler:(void (^)(void))actionHandler;

Installation

From CocoaPods

Add

pod 'SVPullToRefresh'

pod 'SVPullToRefresh', :head

Manually

Important note if your project doesn't use ARC: you must add the

-fobjc-arc

UIScrollView+SVPullToRefresh.m

UIScrollView+SVInfiniteScrolling.m

• Drag the

  SVPullToRefresh/SVPullToRefresh

  folder into your project.
• Add the QuartzCore framework to your project.
• Import

  UIScrollView+SVPullToRefresh.h

  and/or

  UIScrollView+SVInfiniteScrolling.h

Usage

(see sample Xcode project in

/Demo

Adding Pull to Refresh

[tableView addPullToRefreshWithActionHandler:^{
    // prepend data to dataSource, insert cells at top of table view
    // call [tableView.pullToRefreshView stopAnimating] when done
}];

or if you want pull to refresh from the bottom

[tableView addPullToRefreshWithActionHandler:^{
    // prepend data to dataSource, insert cells at top of table view
    // call [tableView.pullToRefreshView stopAnimating] when done
} position:SVPullToRefreshPositionBottom];

If you’d like to programmatically trigger the refresh (for instance in

viewDidAppear:

[tableView triggerPullToRefresh];

You can temporarily hide the pull to refresh view by setting the

showsPullToRefresh

tableView.showsPullToRefresh = NO;

Customization

The pull to refresh view can be customized using the following properties/methods:

@property (nonatomic, strong) UIColor *arrowColor;
@property (nonatomic, strong) UIColor *textColor;
@property (nonatomic, readwrite) UIActivityIndicatorViewStyle activityIndicatorViewStyle;


(void)setTitle:(NSString *)title forState:(SVPullToRefreshState)state;
(void)setSubtitle:(NSString *)subtitle forState:(SVPullToRefreshState)state;
(void)setCustomView:(UIView *)view forState:(SVPullToRefreshState)state;

You can access these properties through your scroll view's

pullToRefreshView

For instance, you would set the

arrowColor

tableView.pullToRefreshView.arrowColor = [UIColor whiteColor];

Adding Infinite Scrolling

[tableView addInfiniteScrollingWithActionHandler:^{
    // append data to data source, insert new cells at the end of table view
    // call [tableView.infiniteScrollingView stopAnimating] when done
}];

If you’d like to programmatically trigger the loading (for instance in

viewDidAppear:

[tableView triggerInfiniteScrolling];

You can temporarily hide the infinite scrolling view by setting the

showsInfiniteScrolling

tableView.showsInfiniteScrolling = NO;

Customization

The infinite scrolling view can be customized using the following methods:

- (void)setActivityIndicatorViewStyle:(UIActivityIndicatorViewStyle)activityIndicatorViewStyle;
- (void)setCustomView:(UIView *)view forState:(SVInfiniteScrollingState)state;

You can access these properties through your scroll view's

infiniteScrollingView

Under the hood

SVPullToRefresh extends

UIScrollView

It uses key-value observing to track the scrollView's

contentOffset

Credits

SVPullToRefresh is brought to you by Sam Vermette and contributors to the project. If you have feature suggestions or bug reports, feel free to help out by sending pull requests or by creating new issues. If you're using SVPullToRefresh in your project, attribution would be nice.

Big thanks to @seb_morel for his Demistifying the Objective-C runtime talk which really helped for this project.

Hat tip to Loren Brichter for inventing pull-to-refresh.