ios 触发 UIButton 时如何获取 touchesBegan 坐标？
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How do you get the touchesBegan coordinates when a UIButton is triggered?
提问by Kevin Peters
I have a touchesBegan method set up to pick up the coordinates when the user touches the screen. It works great except when I touch down on a UIButton. How do I make it so that the button triggers the touchesBegan method too?
我设置了一个 touchesBegan 方法来在用户触摸屏幕时获取坐标。除了当我按下 UIButton 时，它工作得很好。如何使按钮也触发 touchesBegan 方法？
回答by EmptyStack
Add event handlers to the button, something like the following,
向按钮添加事件处理程序，如下所示，
[myButton addTarget:self action:@selector(dragBegan:withEvent:) forControlEvents: UIControlEventTouchDown];
[myButton addTarget:self action:@selector(dragMoving:withEvent:) forControlEvents: UIControlEventTouchDragInside];
[myButton addTarget:self action:@selector(dragEnded:withEvent:) forControlEvents: UIControlEventTouchUpInside | UIControlEventTouchUpOutside];
Handle the events as the following, you can get the touch point from the event evas below,
处理事件如下，您可以从事件ev 中获取接触点，如下所示，
- (void)dragBegan:(UIControl *)c withEvent:ev {
NSLog(@"dragBegan......");
UITouch *touch = [[ev allTouches] anyObject];
CGPoint touchPoint = [touch locationInView:self.view];
NSLog(@"Touch x : %f y : %f", touchPoint.x, touchPoint.y);
}
- (void)dragMoving:(UIControl *)c withEvent:ev {
NSLog(@"dragMoving......");
}
- (void)dragEnded:(UIControl *)c withEvent:ev {
NSLog(@"dragEnded......");
}
This is not my own answer. I got this code from http://sree.cc/iphone/handling-touche-events-for-uibuttons-in-iphoneand made some minor changes.
这不是我自己的答案。我从http://sree.cc/iphone/handling-touche-events-for-uibuttons-in-iphone得到了这个代码并做了一些小改动。
回答by Chandan Shetty SP
Try overriding UIButton class and in the touchesBegan method call [super touchesBegan..].
尝试覆盖 UIButton 类并在 touchesBegan 方法中调用 [super touchesBegan..]。
