-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
didDeselectItemAtIndexPath 是取消选择点击事件
didSelectItemAtIndexPath 是点击事件
就是因为方法名称太像了,每次didDeselectItemAtIndexPath点击的都会选中上次点击的按钮
搞得我检查了半天才把问题解决
这个坑爬的我是醉了