Question

我有一个名为PhotoBoothController的类，我用它来使用手势操作图像。我在iPhone上运行时工作正常。但是当我在iPad上运行它时，我在UIPopoverController中显示PhotoBoothController。图像看起来很好，但我无法操纵它，因为我的手势似乎没有被识别。我不知道如何让UIPopoverController控制手势。

我呈现popovercontroller并配置视图：

- (void)presentPhotoBoothForPhoto:(UIImage *)photo button:(UIButton *)button {

    //Create a photoBooth and set its contents
    PhotoBoothController *photoBoothController = [[PhotoBoothController alloc] init];
    photoBoothController.photoImage.image = [button backgroundImageForState:UIControlStateNormal];

    //set up all the elements programmatically.
    photoBoothController.view.backgroundColor = [UIColor whiteColor];

    //Add frame (static)
    UIImage *frame = [[UIImage imageNamed:@"HumptyLine1Frame.png"] adjustForResolution];
    UIImageView *frameView = [[UIImageView alloc] initWithImage:frame];
    frameView.frame = CGRectMake(50, 50, frame.size.width, frame.size.height);
    [photoBoothController.view addSubview:frameView];

    //Configure image
    UIImageView *photoView = [[UIImageView alloc] initWithImage:photo];
    photoView.frame = CGRectMake(50, 50, photo.size.width, photo.size.height);
    photoBoothController.photoImage = photoView;

    //Add canvas
    UIView *canvas = [[UIView alloc] initWithFrame:frameView.frame];
    photoBoothController.canvas = canvas;
    [canvas addSubview:photoView];
    [canvas becomeFirstResponder];

    [photoBoothController.view addSubview:canvas];
    [photoBoothController.view bringSubviewToFront:frameView];

    //resize the popover view shown in the current view to the view's size
    photoBoothController.contentSizeForViewInPopover = CGSizeMake(frameView.frame.size.width+100, frameView.frame.size.height+400);

    self.photoBooth = [[UIPopoverController alloc] initWithContentViewController:photoBoothController];
    [self.photoBooth presentPopoverFromRect:button.frame
                                     inView:self.view
                   permittedArrowDirections:UIPopoverArrowDirectionAny
                                   animated:YES];
}

我认为[canvas becomeFirstResponder]可能会这样做，但似乎没有什么区别。

任何建议都非常感谢，谢谢。

更新：根据评论添加代码

- (void)viewDidLoad {
  [super viewDidLoad];

  if (!_marque) {
    _marque = [CAShapeLayer layer];
    _marque.fillColor = [[UIColor clearColor] CGColor];
    _marque.strokeColor = [[UIColor grayColor] CGColor];
    _marque.lineWidth = 1.0f;
    _marque.lineJoin = kCALineJoinRound;
    _marque.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:10],[NSNumber numberWithInt:5], nil];
    _marque.bounds = CGRectMake(photoImage.frame.origin.x, photoImage.frame.origin.y, 0, 0);
    _marque.position = CGPointMake(photoImage.frame.origin.x + canvas.frame.origin.x, photoImage.frame.origin.y + canvas.frame.origin.y);
  }
  [[self.view layer] addSublayer:_marque];

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

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

  UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
  [panRecognizer setMinimumNumberOfTouches:1];
  [panRecognizer setMaximumNumberOfTouches:1];
  [panRecognizer setDelegate:self];
  [canvas addGestureRecognizer:panRecognizer];

  UITapGestureRecognizer *tapProfileImageRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
  [tapProfileImageRecognizer setNumberOfTapsRequired:1];
  [tapProfileImageRecognizer setDelegate:self];
  [canvas addGestureRecognizer:tapProfileImageRecognizer];

}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
  return ![gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] && ![gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]];
}

Answer 1

我正在开发一个类似的应用程序，我可以轻松地在画布上操作图像。

1）检查画布的 userInteractionEnabled 属性是否设置为是。
2）您可以尝试将手势添加到ImageView而不是画布。（我猜你想要缩放，旋转n滑动图像）。

Answer 2

一些猜测：

这是因为在设置cavas属性之前调用了viewDidLoad方法吗？在这种情况下，您可以尝试在其他方法（例如viewDidAppear）中添加当前弹出窗口后的识别器。
我也同意关键可能是UIPopoverController允许与popover之外的其他视图进行交互。因此，我建议将[canvas becomeFirstResponder];移至viewDidLoad PhotoBoothController方法的末尾并在此处尝试self.view becomeFirstResponder，因为您实际上会在self.view中添加识别器。
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在UIPopoverController中丢失手势识别器

2 个答案: