Some problems with refresh UICollectionView

//BUG:
    [self.collectionView reloadData];
//Solution:
    [self.collectionView reloadData];
    [self.collectionView setNeedsLayout];
    [self.collectionView layoutIfNeeded];

//One way:
[UIView setAnimationsEnabled:NO];
[collectionView performBatchUpdates:^{
    [collectionView reloadItemsAtIndexPaths:indexPaths];
} completion:^(BOOL finished) {
    [UIView setAnimationsEnabled:YES];
}];
//Besides:
[UIView animateWithDuration:0 animations:^{
    [collectionView performBatchUpdates:^{
        [collectionView reloadItemsAtIndexPaths:indexPaths];
    } completion:nil];
}];
//In addition:
[UIView performWithoutAnimation:^{
    [self.collectionView reloadItemsAtIndexPaths:indexPaths];
}];

//insert data:
@try{
     [self.collectionView performBatchUpdates:^{
            [self.datas insertObjects:items];
            [collectionView insertItemsAtIndexPaths:indexPaths];
     } completion:^(BOOL finished) {
     }];
}
@catch ( NSException * e ) {
     [self reloadCollectionView];
}
//reload data:
@try{
     [self.collectionView performBatchUpdates:^{
            [self.datas replaceItems:items];
            [collectionView reloadItemsAtIndexPaths:indexPaths];
     } completion:^(BOOL finished) {
     }];
}
@catch ( NSException * e ) {
     [self reloadCollectionView];
}
//remove data:
@try{
     [self.collectionView performBatchUpdates:^{
            [self.datas deleteItems:items];
            [collectionView deleteItemsAtIndexPaths:indexPaths];
     } completion:^(BOOL finished) {
     }];
}
@catch ( NSException * e ) {
     [self reloadCollectionView];
}