方式一:
[UIView setAnimationsEnabled:NO];
[collectionView performBatchUpdates:^{
[collectionView reloadData];
} completion:^(BOOL finished) {
[UIView setAnimationsEnabled:YES];
}];
方式二:
[UIView animateWithDuration:0 animations:^{
[collectionView performBatchUpdates:^{
[collectionView reloadData];
} completion:nil];
}];