Question

我的屏幕上有一个UIImageView视图。用户可以平移，缩放和旋转。

我有一个旋转手势设置，除旋转图像移出屏幕/离开视图外，旋转一切都很好。

知道会导致这种行为的原因是什么吗？我正在寻找的预期行为是当你旋转它根本不移动的图像时（旋转除外）。

我已经尝试设置父视图层的锚点，但它似乎没有任何帮助。

编辑：我已经对旋转手势进行了一些记录，发生的事情是图像视图中心（X）正在下降，因此它会离开屏幕。

为什么这个坐标会在旋转时发生变化？ Y保持不变。我甚至尝试过关闭其他手势，这对于旋转手势来说肯定是不可思议的。

以下代码：

- (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

也许是因为平移手势也被调用：尝试将maximumNumberOfTouches设置为UIPanGestureRecognizer

旋转UIImageView时图像移出屏幕/视野外

1 个答案: