UIGestureRecognizer 手势识别器

概述:
UIGestureRecognizer(手势识别器)继承与NSObject类, 作为一个抽象类, 为一系列基础的手势识别器提供了基础定义,其子类化手势识别器如下:
* UITapGestureRecognizer 轻拍手势识别器
* UIPinchGestureRecognizer 捏合手势识别器
* UIRotationGestureRecognizer 旋转手势识别器
* UISwipeGestureRecognizer 清扫手势识别器
* UIPanGestureRecognizer 平移手势识别器
* UIScreenEdgePanGestureRecognizer 屏幕边缘轻扫收拾识别器
* UILongPressGestureRecognizer 长按手势识别器

自定义手势,需要实现以下方法:

11、自定义手势 自定义手势继承：UIGestureRecognizer，实现下面的方法： [cpp] view plaincopy 1 – touchesBegan:withEvent: 2 – touchesMoved:withEvent: 3 – touchesEnded:withEvent: 4 - touchesCancelled:withEvent: 新建一个类，继承UIGestureRecognizer，代码如下： http://blog.csdn.net/totogo2010/article/details/8615940/

UIGestureRecognizer 属性方法

初始化方法 - (instancetype)initWithTarget:(id) target action:(SEL) action
添加或者移除动作 - (void)addTarget:(id) target action:(SEL) action - (void)removeTarget:(id) target action:(SEL) action
获取触摸/位置 - (CGPoint)locationInView:(UIView *) view - (CGPoint)locationOfTouch:(NSUInteger) touchIndex inView:(UIView *) view - (NSUInteger)numberOfTouches	手势在指定视图上的位置 指定手势 在指定视图上的位置 Returns the number of touches involved in the gesture represented by the receiver.
获取手势的状态和所在视图 @property(nonatomic, readonly) UIGestureRecognizerState state @property(nonatomic, readonly) UIView *view @property(nonatomic, getter=isEnabled) BOOL enabled	获取手势状态 获取手势所属视图 设置手势是否可用
取消或者延迟手势
建立一个关联手势 - (void)requireGestureRecognizerToFail:(UIGestureRecognizer *) otherGestureRecognizer	当前手势失败时, 会执行与之相关联的手势, 比如轻拍于 从长安 轻扫于屏幕边缘轻扫
代理 @property(nonatomic, assign) id< UIGestureRecognizerDelegate > delegate

协议方法

.- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer • - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch · 协议方法 之是否允许某个指定手势可以同时识别多个动作; - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer • - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 边缘平扫 和平扫的识别 • - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer

同时识别两个手势

只需要将其返回YES即可同时执行多种手势；如果手势之间或手势对应的视图有冲突或者有不同的需求，可以在这个方法里面添加一些相应的判断，例如一个uiview里面有3个手势分别是移动、缩放、旋转，而我只需要同时执行缩放和旋转的话： // called when the recognition of one of gestureRecognizer or otherGestureRecognizer would be blocked by the other // return YES to allow both to recognize simultaneously. the default implementation returns NO (by default no two gestures can be recognized simultaneously) // // note: returning YES is guaranteed to allow simultaneous recognition. returning NO is not guaranteed to prevent simultaneous recognition, as the other gesture's delegate may return YES - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { if ([gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]] && [otherGestureRecognizer isKindOfClass:[UIRotationGestureRecognizer class]]) { return YES; } returnNO; }

1. 轻拍手势识别器(UITapGestureRecognizer)
基本属性

@property(nonatomic) NSUInteger numberOfTapsRequired @property(nonatomic) NSUInteger numberOfTouchesRequired

实例

创建轻拍手势识别器 UITapGestureRecognizer *tap =[ [UITapGestureRecognizer alloc] initWithTarget:self action:@Selector(handleTap:)]; [aView addGestureRecognizer: tap]; [tap release]; 执行方法

2. 捏合手势识别器(UIPinchGestureRecognizer)

属性

@property(nonatomic) CGFloat scale @property(nonatomic, readonly) CGFloat velocity

两个手指间的坐标差 缩放速度

实例

//创建缩放手势识别器视图对象 UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)]; //为缩放手势设置代理对象 pinch.delegate = self; [aView addGestureRecognizer:pinch]; [pinch release]; - (void)handlePinch:(UIPinchGestureRecognizer *)sender { //获取手势作用的视图 UIView *aView = sender.view; //通过2D仿射变换函数中的缩放函数来修改view的transform属性 aView.transform = CGAffineTransformScale(aView.transform, sender.scale,sender.scale); sender.scale = 1; //每次缩放完成后,将缩放比例设置成100%,表示下一次缩放将以当前视图为原始比例开始缩放 }

3. 旋转手势识别器(UIRotationGestureRecognizer)

属性

@property(nonatomic) CGFloat rotation @property(nonatomic, readonly) CGFloat velocity

旋转弧度 速度

实例

//创建旋转手势识别器对象 UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotaion:)]; [aView addGestureRecognizer:rotation]; [rotation release]; //获取手势作用的视图 UIView *aView = sender.view; //通过2D仿射变换函数中的旋转函数修改视图中的transform属性 aView.transform = CGAffineTransformRotate(aView.transform, sender.rotation); //将角度差归零 sender.rotation = 0;

4. 轻扫手势识别器(UISwipeGestureRecognizer)

属性

@property(nonatomic) UISwipeGestureRecognizerDirection direction @property(nonatomic) NSUInteger numberOfTouchesRequired	轻扫的方向
UISwipeGestureRecognizerDirectionRight = 1 << 0, UISwipeGestureRecognizerDirectionLeft = 1 << 1, UISwipeGestureRecognizerDirectionUp = 1 << 2, UISwipeGestureRecognizerDirectionDown = 1 << 3

实例

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe)]; 可获取轻扫方向

5. 轻拍手势识别器(UIPanGestureRecognizer)
基本属性

配置手势适配器 @property(nonatomic) NSUInteger maximumNumberOfTouches @property(nonatomic) NSUInteger minimumNumberOfTouches The minimum number of fingers that can be touching the view for this gesture to be recognized. 这个触摸事件能够处理的最多的手指数量 默认为最大整数 最小默认为1

实例

//创建平移手势识别器 UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handPan:)]; //将手势识别器指定给需要识别的视图 [aView addGestureRecognizer:pan]; [pan release]; - (void)handPan:(UIPanGestureRecognizer *)sender { //一旦一个识别器对象被添加到某个试图上,那么该识别器对象的view属相就会指向被作用的视图 UIView *aView = sender.view; //通过修改View的transform属性完成形变操作 CGPoint currentPoint = [sender translationInView:aView.superview]; //transform可以让视图产生位移形变,借助与位移相关的2D仿射变换函数来完成操作 // aView.transform = CGAffineTransformMakeTranslation(currentPoint.x, currentPoint.y); //简化版--适用于一次平移 aView.transform = CGAffineTransformTranslate(aView.transform, currentPoint.x, currentPoint.y); [sender setTranslation:CGPointZero inView:aView.superview]; }

6. 长按手势识别器(UILongPressGestureRecognizer)

属性

@property(nonatomic) CFTimeInterval minimumPressDuration @property(nonatomic) NSUInteger numberOfTouchesRequired @property(nonatomic) NSUInteger numberOfTapsRequired @property(nonatomic) CGFloat allowableMovement

最短按压时间 允许按压时移动的距离 默认时10

实例

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget: self action :@Selecor(handleLongPress) longPress.minimumPressDuration = 3;

7. 屏幕边缘轻扫手势识别器(UIScreenEdgePanGestureRecognizer)

属性

@property(readwrite, nonatomic, assign) UIRectEdge edges

轻扫的边缘

实例

实例化后可通过获取轻扫的边缘 进行操作