旋转UIImageView时，图像移出屏幕/视线外

Question

我在屏幕上有一个UIImageView的视图。 用户可以平移，缩放和旋转。

我有一个旋转手势设置，旋转时一切正常，除了旋转图像时移出屏幕/离开视图。

任何想法会导致这种行为吗？ 我要寻找的预期行为是旋转图像时它根本不动（旋转除外）。

我尝试设置父视图层的锚点，但是似乎没有任何帮助。

编辑：我已经在旋转手势上进行了一些记录，正在发生的是图像视图中心（X）正在下车，因此它不在屏幕上。

为什么旋转时坐标会改变？ Y保持不变。 我什至尝试关闭其他手势，但旋转手势肯定有些古怪。

下面的代码：

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

    CALayer *l = [self.viewCase layer];
    [l setMasksToBounds:YES];
    [l setCornerRadius:30.0];

    self.imgUserPhoto.userInteractionEnabled = YES;
    [self.imgUserPhoto setClipsToBounds:NO];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
    panRecognizer.maximumNumberOfTouches = 1;
    [self.view addGestureRecognizer:panRecognizer];

    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchDetected:)];
    [self.view addGestureRecognizer:pinchRecognizer];

    UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationDetected:)];
    [self.view addGestureRecognizer:rotationRecognizer];

    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected:)];
    tapRecognizer.numberOfTapsRequired = 2;
    [self.view addGestureRecognizer:tapRecognizer];

    panRecognizer.delegate = self;
    pinchRecognizer.delegate = self;
    rotationRecognizer.delegate = self;
}

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
    CGPoint translation = [panRecognizer translationInView:self.view];
    CGPoint imageViewPosition = self.imageView.center;
    imageViewPosition.x += translation.x;
    imageViewPosition.y += translation.y;

    self.imageView.center = imageViewPosition;
    [panRecognizer setTranslation:CGPointZero inView:self.view];
}

- (void)pinchDetected:(UIPinchGestureRecognizer *)pinchRecognizer
{
    CGFloat scale = pinchRecognizer.scale;
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, scale, scale);
    pinchRecognizer.scale = 1.0;
}

- (void)rotationDetected:(UIRotationGestureRecognizer *)rotationRecognizer
{
    CGFloat angle = rotationRecognizer.rotation;
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, angle);
    rotationRecognizer.rotation = 0.0;
}

- (void)tapDetected:(UITapGestureRecognizer *)tapRecognizer
{
    [UIView animateWithDuration:0.25 animations:^{
        self.imageView.center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));
        self.imageView.transform = CGAffineTransformIdentity;
    }];
}

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

Answer 1

也许是因为泛姿态也越来越称为：尝试设置maximumNumberOfTouches您到1 UIPanGestureRecognizer