ios – 如何在UICollectionView上触摸背景(即不是单元格)？

我已经尝试了子类化UICollectionView并覆盖touchesBegan：withEvent：和hitTest：WithEvent：,当我触摸单元格时,这两个方法都会触发.但是,如果我触摸单元格之间的空间,则根本不会发生任何事情.这是我创造的：

@interface WSImagegalleryCollectionView : UICollectionView
@end

..和..

@implementation WSImagegalleryCollectionView

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"touches began");
    [super touchesBegan:touches withEvent:event];
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    NSLog(@"Hit test reached");
    return [super hitTest:point withEvent:event];
}

@end

注意：手势识别器似乎有完全相同的问题,这就是为什么我尝试使用touchesBegan进行更低级别的操作.

collectionView.backgroundView = [[UIView alloc] init];
[collectionView.backgroundView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOnBackgroundRecognized)]];