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1.继承链：NSObject
2.UIGestureRecognizer的子类有以下：
UIScreenEdgePanGestureRecognizer ：拖动，不过要从侧边拖动UILongPressGestureRecognizer ：长按
3.想要使用手势一系列的行为需要遵守 UIGestureRecognizerDelegate协议
4.初始化手势识别器
(1)- (instancetype)initWithTarget:(id)target action:(SEL)action :为一个对象初始化和分配空间，并设定手势的行为
5.添加和移除target和行为
(1)- (void)addTarget:(id)target action:(SEL)action :为手势识别器对象添加一个target，并设定指定的行为
(2)- (void)removeTarget:(id)target action:(SEL)action :从手势识别器中移除指定的target和指定的action
6.获取手势的touches和位置
(1)- (CGPoint)locationInView:(UIView *)view :返回指定视图被触摸的位置
(2)- (CGPoint)locationOfTouch:(NSUInteger)touchIndex inView:(UIView *)view ：触摸点相对于指定视图的位置
(3)- (NSUInteger)numberOfTouches ：触摸点的数量
7.获取手势的状态和视图
(1)@property(nonatomic, readonly) UIGestureRecognizerStatestate ：获取手势的状态
(2)@property(nonatomic, readonly) UIView*view ：获取接受手势的视图
(3)@property(nonatomic, getter=isEnabled) BOOL enabled :手势是否可用
8.取消和延迟触摸
(1)@property(nonatomic) BOOL cancelsTouchesInView :取消视图的触摸
(2)@property(nonatomic) BOOL delaysTouchesBegan :延迟触摸的开始
(3)@property(nonatomic) BOOL delaysTouchesEnded ：延迟触摸的结束
9.指定两个手势识别器的依赖
(1)- (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer :只有当别的识别器触发失败的时候才使用该识别
10.设定委托
(1)@property(nonatomic, weak) id< UIGestureRecognizerDelegate> delegate :设定指定的委托
11.子类的方法
(1)- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event :触摸屏幕时开始执行这个方法
(2)- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event :触摸移动过程中执行这个方法
(3)- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event :触摸结束的时候执行这个方法
(4)- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event :当触摸因为意外情况而取消就会执行这个方法
(5)- (void)reset :重置手势
(6)- (void)ignoreTouch:(UITouch *)touch forEvent:(UIEvent *)event :忽略某个事件的手势
(7)- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer :重载这个方法能够执行UIGestureRecognizerDelegate协议里面的方法gestureRecognizerShouldBegin: and gestureRecognizer:shouldReceiveTouch:.
(8)- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer :Overridden to indicate that the receiver can prevent the specified gesture recognizer from recognizing its gesture.
(9)- (BOOL)shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer :重载这个方法来设定接收者不响应指定的手势
(10)- (BOOL)shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer :重载这个方法来指定接收者应该被要求失败通过指定的手势识别器，Overridden to indicate that the receiver should be required to fail by the specified gesture recognizer.
(11)- (void)ignorePress:(UIPress *)button forEvent:(UIPressesEvent *)event :告诉手势识别器忽视按的事件
(12)- (void)pressesBegan:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event :当按钮被按的时候发送事件到接收者
(13)- (void)pressesChanged:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event :当按钮的压力变化的时候发送事件到接收者
(14)- (void)pressesEnded:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event ：当按钮结束按的动作的时候发送事件给接收者
(15)- (void)pressesCancelled:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event :当按钮的按动作被取消的时候发送事件到接收者
12.配置不同的手势
(1)@property(nonatomic, copy) NSArray<NSNumber *> *allowedPressTypes :一组不同按的类型来区分按钮被按
(2)@property(nonatomic, copy) NSArray<NSNumber *> *allowedTouchTypes :一组不同的触摸类型，用来区分不同的touches
13.数据类型
UIGestureRecognizerStatePossible,
UIGestureRecognizerStateBegan,
UIGestureRecognizerStateChanged,
UIGestureRecognizerStateEnded,
UIGestureRecognizerStateCancelled,
UIGestureRecognizerStateFailed,
UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded
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