使 UIPinchGestureRecognizer 和 UIRotationGestureRecognizer 一起工作答案

【问题标题】：making UIPinchGestureRecognizer and UIRotationGestureRecognizer working together使 UIPinchGestureRecognizer 和 UIRotationGestureRecognizer 一起工作
【发布时间】：2012-12-03 08:27:12
【问题描述】：

我尝试使用手势缩放和旋转 UIImageView。我在网上看到过几个例子，我已经实现了，但是不能一起工作。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    imgView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
   // imgView.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height);
    imgView.image = [UIImage imageNamed:@"spotItInLondonIcon.png"];
    [imgView setContentMode:UIViewContentModeScaleAspectFit];
    [imgView setMultipleTouchEnabled:YES];
    [imgView setUserInteractionEnabled:YES];
    [self.view addSubview:imgView];

    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];
    [imgView addGestureRecognizer:pinch];
    pinch.delegate = self;

    UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];
    [imgView addGestureRecognizer:rotate];
    rotate.delegate = self;
}
-(void)pinch: (UIPinchGestureRecognizer*)sender
{
    CGFloat scale = sender.scale;
    imgView.transform = CGAffineTransformScale(imgView.transform, scale, scale);
    sender.scale = 1.0;
    NSLog(@"pinch executed");
}
-(void)rotation: (UIRotationGestureRecognizer*)rotationDetected
{
    CGFloat angle = rotationDetected.rotation;
    imgView.transform = CGAffineTransformRotate(imgView.transform, angle);
    rotationDetected.rotation = 0.0;
    NSLog(@"rotation executed");
}

然后我将委托添加到 .h 文件并将方法添加到应用程序委托.m，但当时仍然只有一个手势有效。

@interface ViewController : UIViewController <UIGestureRecognizerDelegate>

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

有人可以帮我吗？

【问题讨论】：

识别器总是一样有效吗？您是否检查过它们是否分别工作？即只添加它们。
如果我开始捏合，它会缩放图像，但我不能同时捏合和旋转。如果我将开始旋转，然后尝试同时捏，那么再次只有旋转有效。

标签： objective-c xcode uiview uigesturerecognizer

【解决方案1】：

应用程序 delegate.m 的方法？？您必须在要添加手势的类中添加方法，在您的情况下是 viewcontroller.m

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

viewcontroller.m 中的这个方法不在 appdelegate.m 中

【讨论】：

这就是解决方案！我不知道，该方法看起来应该在 appDelegate 中，但现在我知道我错了。谢谢你的回答。