ContinueTrackingWithTouch:withEvent: 方法没有被调用？
我有一个自定义 UIView 类。在该视图内，有一个图像视图。 （我正在从头开始制作 UISlider）。
我试图让图像视图（滑块的拇指）在视图上移动。下面是 UIView 类中的代码
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
CGPoint touchPoint = [touch locationInView:self];
if ( CGRectContainsPoint(self.thumb.frame, touchPoint))
self.thumb.center = CGPointMake(touchPoint.x, self.thumb.center.y);
return YES;
}
当我将手指放在滑块的拇指上并尝试拖动它时，没有任何反应。然而，当我触摸滑块的拇指外侧时，将手指拖到拇指上不放手，然后尝试拖动拇指，效果很好。
如何修改我的代码，以便当有人握住拇指并尝试拖动它时调用该方法？
I have a custom UIView class. Inside that view, there is an image view. (I'm making a UISlider from scratch).
I am trying to get the image view -- the thumb of the slider -- to move across the view. Below is the code from the UIView class
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
CGPoint touchPoint = [touch locationInView:self];
if ( CGRectContainsPoint(self.thumb.frame, touchPoint))
self.thumb.center = CGPointMake(touchPoint.x, self.thumb.center.y);
return YES;
}
When I place my finger on the thumb of the slider and try to drag it, nothing happens. However, when I touch outside the thumb of the slider, drag my finger to the thumb without letting go, and then try dragging the thumb, it works fine.
How can I modify my code so that the method will be called when someone holds the thumb and tries to drag it?
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我的猜测是，您在图像视图上启用了用户交互，这反过来又不会将触摸事件中继到支持逻辑视图。做这样的事情：
将其放入您正在使用的任何初始化方法中，拇指视图将不再中断触摸事件。
My guess is that you have user interaction enabled on your image view, which is in turn not relaying the touch events to the backing logic view. Do something like this:
Put that in whatever init method you are using and the thumb view will not interrupt the touch events anymore.