UICollectionView 点击空白 继续传递事件

gistfile1.txt

继承并实现
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [[self nextResponder] touchesBegan:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch * touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:self];
    NSIndexPath * tappedCellPath = [self indexPathForItemAtPoint:touchPoint];//获取点击处的cell的indexPath
    if (tappedCellPath == nil) {
        [[self nextResponder] touchesEnded:touches withEvent:event];
    }else{
        [self.delegate collectionView:self didSelectItemAtIndexPath:tappedCellPath];
    }
}