UIImageView 像素完美的“触摸开始”，用于 UIImage 的非透明部分

发布于 2024-12-27 05:48:49 字数 545 浏览 0 评论 0原文

开发iPhone应用程序，我使用了UIImageview，并且设置了不规则形状的图像

// uiimageview type shutter
shutter = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,32.5)];

//setting image on shutter
UIImage* shutterimg = [UIImage imageNamed:@"trayshutter.png"];
[shutter setImage:shutterimg];
// User interaction
shutter.userInteractionEnabled=YES;

，并且使用touchesbegan进行触摸，

一切都很好，但问题是我还在CGRectMake占用的所有矩形区域中获取事件（即0,0,320， 32.5）的 imageview，而我只需要图像上的事件（其形状为 -----|||||-----）。

如何确保我仅在图像上获取事件，而不是在 cgrectmake 覆盖的其余区域上获取事件？

原文

developing iphone app, I have used a UIImageview and i have set an image of irregular shape

// uiimageview type shutter
shutter = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,32.5)];

//setting image on shutter
UIImage* shutterimg = [UIImage imageNamed:@"trayshutter.png"];
[shutter setImage:shutterimg];
// User interaction
shutter.userInteractionEnabled=YES;

and i get touches using touchesbegan

everything is fine, but issue is I also get events in all the rectangle area occupied by the CGRectMake (i.e. 0,0,320,32.5) of imageview, whereas i require events only on the image (which is of shape of -----|||||-----).

How can i make sure that i get events only on the image and not on the rest of area covered by cgrectmake ?

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薄凉少年不暖心 2025-01-03 05:48:49

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [touches anyObject];
  if ([touch view] == yourDesiredImage) {
    // Do something here
  }
}

编辑：也许你可以尝试 UITapGestureRecognizer 代替：

UITapGestureRecognizer * tapGestureRecognizer = [[UITapGestureRecognizer alloc] init];
[tapGestureRecognizer addTarget:self action:@selector(yourTouchMethod:)];
[tapGestureRecognizer setNumberOfTapsRequired:1];
[shutter addGestureRecognizer:tapGestureRecognizer];
[tapGestureRecognizer release];

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [touches anyObject];
  if ([touch view] == yourDesiredImage) {
    // Do something here
  }
}

EDIT: maybe you can try UITapGestureRecognizer instead:

UITapGestureRecognizer * tapGestureRecognizer = [[UITapGestureRecognizer alloc] init];
[tapGestureRecognizer addTarget:self action:@selector(yourTouchMethod:)];
[tapGestureRecognizer setNumberOfTapsRequired:1];
[shutter addGestureRecognizer:tapGestureRecognizer];
[tapGestureRecognizer release];

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