UIRefreshControl on UICollectionView only works if the collection fills the height of the container

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Try this:

self.collectionView.alwaysBounceVertical = YES;

Complete code for a UIRefreshControl

UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
refreshControl.tintColor = [UIColor grayColor];
[refreshControl addTarget:self action:@selector(refershControlAction) forControlEvents:UIControlEventValueChanged];
[self.collectionView addSubview:refreshControl];
self.collectionView.alwaysBounceVertical = YES;

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