How do I know that the UICollectionView has been loaded completely?

uicollectionview delegates reload
Jirune picture Jirune · Dec 24, 2012 · Viewed 71.1k times · Source

I have to do some operation whenever UICollectionView has been loaded completely, i.e. at that time all the UICollectionView's datasource / layout methods should be called. How do I know that?? Is there any delegate method to know UICollectionView loaded status?

Answer

myeyesareblind picture myeyesareblind · Jun 5, 2015

This worked for me:

[self.collectionView reloadData];
[self.collectionView performBatchUpdates:^{}
                              completion:^(BOOL finished) {
                                  /// collection-view finished reload
                              }];

Swift 4 syntax:

self.collectionView.reloadData()
self.collectionView.performBatchUpdates(nil, completion: {
    (result) in
    // ready
})

Related questions

Cell spacing in UICollectionView

How do I set cell spacing in a section of UICollectionView? I know there is a property minimumInteritemSpacing I have set it to 5.0 still the spacing is not appearing 5.0. I have implemented the flowout delegate method. - (CGFloat)collectionView:(UICollectionView *)…

Read More
Fatal error: unexpectedly found nil while unwrapping an Optional values

I was using an UICollectionView in Swift but I get when I try to change the text of the cell's label. func collectionView(collectionView: UICollectionView!, numberOfItemsInSection section: Int) -> Int { return 5 } func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -&…

Read More
UICollectionView Self Sizing Cells with Auto Layout

I'm trying to get self sizing UICollectionViewCells working with Auto Layout, but I can't seem to get the cells to size themselves to the content. I'm having trouble understanding how the cell's size is updated from the contents of what's …

Read More