I want to implement pull-down-to-refresh in a UICollectionViewController
under iOS 6. This was easy to achieve with a UITableViewController
, like so:
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(startRefresh:)
forControlEvents:UIControlEventValueChanged];
self.refreshControl = refreshControl;
The above implements a nice liquid-drop animation as part of a native widget.
As UICollectionViewController
is a "more evolved" UITableViewController
one would expect somewhat of a parity of features, but I can't find a reference anywhere to a built-in way to implement this.
UIRefreshControl
be used somehow with UICollectionViewController
despite the header and docs both stating that it's meant to be used with a table view?The answers to both (1) and (2) are yes.
Simply add a UIRefreshControl
instance as a subview of .collectionView
and it just works.
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(startRefresh:)
forControlEvents:UIControlEventValueChanged];
[self.collectionView addSubview:refreshControl];
That's it! I wish this had been mentioned in the documentation somewhere, even though sometimes a simple experiment does the trick.
EDIT: this solution won't work if the collection is not big enough to have an active scrollbar. If you add this statement,
self.collectionView.alwaysBounceVertical = YES;
then everything works perfectly. This fix taken from another post on the same topic (referenced in a comment in the other posted answer).