问题
Using iOS6's awesome new UICollectionView how am I able to delete all of the UICollectionViewCell objects in a big loop?
Say I've loaded all my data into it already, I hit refresh, I want to delete everything currently in there, then just call my stuff again.
I've found deleteItemsAtIndexPaths which takes an NSArray, so how can I get all items into it?
回答1:
The proper way of clearing out a UICollectionVew is to simply clear the data source and then reload the collection view.
So if your data source was an array:
self.dataArray = nil;
[self.collectionView reloadData];
Boom, you're cleared out.
回答2:
Turns out I can use deleteSections and pass a NSIndexSet through to it, making a range of 0,0 and it'll delete the one and only section.
NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 0)];
[self.collectionView deleteSections:indexSet];
I could probably just use indexSetWithIndex but when I did my app crashed.
来源：https://stackoverflow.com/questions/13113850/empty-all-cells-from-uicollectionview