ios - PinchGesture 事件时不调用 RotationGesture

Question

我在上面有 drawingView 和 listen 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 就完美了。但是，如果使用 UIRotationGestureRecognizer 和 UIPinchGestureRecognizer 仅调用 UIPinchGestureRecognizer，则不会调用 UIRotationGestureRecognizer。我的代码有什么问题？我想我会制作一个 UISegmented 来选择模式，UIRotationGestureRecognizer 或 UIPinchGestureRecognizer，我应该怎么做？

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:除了在您的 .h 中包含委托(delegate)之外，请确保将您的 UIGestureRecognizer 的委托(delegate)设置为自身，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];