ios - 当PinchGesture处于事件状态时，不会调用RotationGesture

我有drawingView并在其上监听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，那是完美的。但是，如果仅使用UIRotationGestureRecognizer和UIPinchGestureRecognizer来调用，则不会调用UIRotationGestureRecognizer。
我的代码有什么问题？
我想我将使UISegmented选择模式，UIRotationGestureRecognizer或UIPinchGestureRecognizer，我该怎么办？

非常感谢

最佳答案

如果要一次识别多个手势，请尝试使用gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer，例如：

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

编辑：除了将委托包含在您的.h中之外，请确保将UIGestureRecognizer的委托设置为self，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];

关于ios - 当PinchGesture处于事件状态时，不会调用RotationGesture，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22160816/