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

Question

开发 iphone 应用程序，我使用了 UIImageview 并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;

我使用 touchesbegan 进行接触

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

如何确保我只在图像上而不是在 cgrectmake 覆盖的其余区域上获得事件？

Answer 1

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

编辑：也许你可以试试UITapGestureRecognizer：

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