当PinchGesture处于活动状态时，RotationGesture不会调用

Question

我有drawingView并在其上收听UIPanGestureRecognizer，UIRotationGestureRecognizer和UIPinchGestureRecognizer。

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
    [self.drawingView addGestureRecognizer:panRecognizer];

    UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateRecognizer:)];
    [self.drawingView addGestureRecognizer:rotateRecognizer];

    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRecognizer:)];
    [self.drawingView addGestureRecognizer:pinchRecognizer];
    [self.drawingView reloadData];
}

-(void) pinchRecognizer:(UIPinchGestureRecognizer*) recognizer {
    return;
    NSLog(@"Call scale");
}

- (void)rotateRecognizer:(UIRotationGestureRecognizer*)recognizer {
    NSLog(@"Call rotaion");
}

如果我只选择UIRotationGestureRecognizer或UIPinchGestureRecognizer，那就完美了。但是如果使用UIRotationGestureRecognizer和UIPinchGestureRecognizer只调用UIPinchGestureRecognizer，则不会调用UIRotationGestureRecognizer。 我的代码有什么问题？ 我想我会做一个UISegmented选择模式，UIRotationGestureRecognizer或UIPinchGestureRecognizer，我该怎么办？

非常感谢

Answer 1

如果您想同时识别多个手势，请尝试使用gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer，例如：

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

编辑：除了在.h中包含代理人外，请确保将UIGestureRecognizer的代理人设置为自己，例如：

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
panRecognizer.delegate = self;
[self.drawingView addGestureRecognizer:panRecognizer];

UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateRecognizer:)];
rotateRecognizer.delegate = self;
[self.drawingView addGestureRecognizer:rotateRecognizer];

Answer 2

如果其他手势识别器未执行，请使用requireGestureRecognizerToFail:识别手势。

[rotateRecognizer requireGestureRecognizerToFail: pinchRecognizer];