xcode 如何在iphone的手势识别器中获取原始附加视图？
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How to get the original attached view in gesture recognizer in iphone?
提问by Reyjohn
By the following code I attatched a button in a gesture recognizer:
通过以下代码，我在手势识别器中附加了一个按钮：
UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(addLongpressGesture:)];
[longPress setDelegate:self];
[BUTTON addGestureRecognizer:longPress];
Here is my addLongpressGesture method:
这是我的 addLongpressGesture 方法：
- (void)addLongpressGesture:(UILongPressGestureRecognizer *)sender {
UIView *view = sender.view;
CGPoint point = [sender locationInView:view.superview];
if (sender.state == UIGestureRecognizerStateBegan){
// GESTURE STATE BEGAN
}
}
by this code sender.viewI am getting the attached view as UIViewBut I want the view as it was attached (UIButton), how do I get the UIView as UIButton?
通过这段代码，sender.view我获得了附加的视图，UIView但是我想要附加的视图（UIButton），如何将 UIView 获取为 UIButton？
回答by Patel
change this
改变这个
UIView *view = sender.view;
to this
对此
UIButton *btn = (UIButton*)sender.view;
回答by dasblinkenlight
Like this:
像这样：
UIButton *button = (UIButton*)sender.view;
UIButtonis a UIView. If you know that your gesture recognizer is attached to a button, this cast is safe.
UIButton是一个UIView。如果您知道您的手势识别器附加到按钮上，则此转换是安全的。
回答by n00bProgrammer
UIView* yourView = yourGestureRecogniser.view;
Since each gestureRecogniserhas only one viewproperty, this explains why a gesture recogniser can be added to 1 view only.
由于每个gestureRecogniser都只有一个view属性，这就解释了为什么只能将手势识别器添加到 1 个视图中。
