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当 superview 有 tapGesture 时，collectionView 没有调用 didSelectItemAtIndexPath？这是为什么？
为什么它根据响应者链打印“doGesture”？

1. initCollectionView 然后添加到 self.view
2. 在 self.view 中添加TapGesture
3. 单击 iPhone 中的项目。

4. 不调用 didSelectItemAtIndexPath。

   - (void)viewDidLoad {
       [super viewDidLoad];
       UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
       self.collectionView = [[MyCollectionView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height - 100) collectionViewLayout:flowLayout];
       [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"abc"];
       self.collectionView.delegate = self;
       self.collectionView.dataSource = self;
       [self.view addSubview:self.collectionView];
   
       UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doGesture)];
       tapGesture.delegate = self;
       [self.view addGestureRecognizer:tapGesture];
   }
   
   - (void)doGesture
   {
       NSLog(@"%@",@"doGesture");
   }
   
   - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
   {
       return 100; …

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