在UIView上触摸事件

Question

有没有人有任何示例代码来检测动态创建的UIView上的触摸？我找到了一些touchesBegan的引用,但无法弄清楚如何实现它...

Answer 1

获取触摸的一般方法是在自定义UIView子类中重写这些方法:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event

这些方法的官方文档位于UIResponder类文档中的响应触摸事件(UIView继承了这些方法,因为它是UIResponder的子类).iOS的" 事件处理指南"中可以找到更长和更多的介绍性文档.

如果您只想检测点击(触摸,然后在视图UIButton中进行修饰),最简单的方法是添加一个视图的子视图,并添加自己的自定义方法作为该按钮的目标/操作对.自定义按钮默认不可见,因此不会影响视图的外观.

如果您正在寻找更高级的互动,那么了解该UIGestureRecognizer课程也是一件好事.

Answer 2

在UIView上使用UIAnimation创建触摸事件,您可以在任何地方管理UIView上的触摸.

以下代码:这里self.finalScore是一个UIView,而cup是一个UIImageView.我处理

UIImageView上的触摸事件,它出现在UIView中.

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

UITouch *touch1 = [touches anyObject];
CGPoint touchLocation = [touch1 locationInView:self.finalScore];
CGRect startRect = [[[cup layer] presentationLayer] frame];
CGRectContainsPoint(startRect, touchLocation);

[UIView animateWithDuration:0.7 
                      delay:0.0 
                    options:UIViewAnimationCurveEaseOut 
                 animations:^{cup.transform = CGAffineTransformMakeScale(1.25, 0.75);} 
                 completion:^(BOOL finished) {  
                     [UIView animateWithDuration:2.0 
                                           delay:2.0 
                                         options:0
                                      animations:^{cup.alpha = 0.0;} 
                                      completion:^(BOOL finished) {
                                          [cup removeFromSuperview];
                                          cup = nil;}];                 
                 }];

}

像UITapGestureRecognizer一样处理UIView上的触摸事件....

UITapGestureRecognizer *touchOnView = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(releaseButAction)] autorelease];

// Set required taps and number of touches
[touchOnView setNumberOfTapsRequired:1];
[touchOnView setNumberOfTouchesRequired:1];

// Add the gesture to the view
[[self view] addGestureRecognizer:touchOnView];

Answer 3

UIView通过继承UIView并覆盖子类中的以下方法，从创建的子类中创建自己的自定义项，

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

}