objective-c 触摸事件

Question

我有一组图像，想知道我触摸了哪些图像。我怎么能实现那个......？ 更准确地说: “Home-Class”将实例化几个图像类:

Image *myImageView = [[Image alloc] initWithImage:myImage];

图像类看起来像这样:

- (id) initWithImage: (UIImage *) anImage 
{
    if ((self = [super initWithImage:anImage])) 
    {
        self.userInteractionEnabled = YES;
    }
    return self;
}

稍后，我也在图像类中使用了这些触摸事件方法:

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{}
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{}

我目前的问题:无论我触摸屏幕的哪个位置，touchesBegan/Ended 方法都会被触发，但我想找出哪些图像被触摸了......

Answer 1

无论何时触摸，您都会检查该触摸是否发生在您的图像区域之间。这是示例代码，假设您有一个名为 img 的 UIImage 对象。

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];

    CGPoint location = [touch locationInView:self.view];

    if (location.x >= img.x && location.x <= img.x && location.y >= img.y && location.y <= img.y) {
        // your code here...
    }


}