UIView关联多个Gesture

如果一个UIView关联多个UIGestureRecognizer, 会发生一个奇怪的问题，如下面代码

[cpp]
    UIPanGestureRecognizer *pang = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panned:)];
    [self.view addGestureRecognizer:pang];

    UISwipeGestureRecognizer *swip = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swip:)];
    [self.view addGestureRecognizer:swip];
- (void)swip:(UISwipeGestureRecognizer *)gesture {
    NSLog(@"swip");
}

- (void)panned:(UIPanGestureRecognizer *)gesture {
    NSLog(@"pan");
}

    UIPanGestureRecognizer *pang = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panned:)];
    [self.view addGestureRecognizer:pang];

    UISwipeGestureRecognizer *swip = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swip:)];
    [self.view addGestureRecognizer:swip];
- (void)swip:(UISwipeGestureRecognizer *)gesture {
    NSLog(@"swip");
}

- (void)panned:(UIPanGestureRecognizer *)gesture {
NSLog(@"pan");
}
结果是看不到swip的手势触发。

原因是系统event传递是，当有一个相响了，event就不会传递下去了。

要想两个gesturerecognizer都起作用，只需要加几行代码就可以了

[cpp]
swip.delegate = self;

swip.delegate = self;
然后实现，返回YES,表示还要响应otherGestureRecognizer.

[cpp]
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
这下就可以看到swip在consol中打印出来。

补充：移动开发 , IOS ,