- (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;

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event; 
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event; 
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event;

- (void)remoteControlReceivedWithEvent:(UIEvent *)event;

- (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

觸摸產(chǎn)生時(shí)所處的窗口
@property(nonatomic,readonly,retain) UIWindow *window;
觸摸產(chǎn)生時(shí)所處的視圖
@property(nonatomic,readonly,retain) UIView  *view;
短時(shí)間內(nèi)點(diǎn)按屏幕的次數(shù)，可以根據(jù)tapCount判斷單擊、雙擊或更多的點(diǎn)擊
@property(nonatomic,readonly) NSUInteger tapCount;
記錄了觸摸事件產(chǎn)生或變化時(shí)的時(shí)間，單位是秒
@property(nonatomic,readonly) NSTimeInterval  timestamp;
當(dāng)前觸摸事件所處的狀態(tài)
@property(nonatomic,readonly) UITouchPhase phase;

- (CGPoint)locationInView:(UIView *)view;
返回值表示觸摸在view上的位置
這里返回的位置是針對(duì)view的坐標(biāo)系的（以view的左上角為原點(diǎn)(0, 0)）
調(diào)用時(shí)傳入的view參數(shù)為nil的話，返回的是觸摸點(diǎn)在UIWindow的位置
- (CGPoint)previousLocationInView:(UIView *)view;
該方法記錄了前一個(gè)觸摸點(diǎn)的位置

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{

 //取得UITouch對(duì)象
 UITouch *touch = [touches anyObject];
 //獲取上一個(gè)點(diǎn)
 CGPoint p = [touch previousLocationInView:self];
 //獲取當(dāng)前點(diǎn)
 CGPoint currp = [touch locationInView:self];
 //產(chǎn)生平移拖拽效果
 self.transform = CGAffineTransformTranslate(self.transform, currp.x - p.x, currp.y - p.y);

}

private int x, y;
@Override
 public boolean onTouchEvent(MotionEvent event) {
  switch (event.getAction()){
   case MotionEvent.ACTION_DOWN:
    x = (int) event.getRawX();
    y = (int) event.getRawY();
    break;
   case MotionEvent.ACTION_MOVE:
    int mx = (int)event.getRawX();
    int my = (int)event.getRawY();

//    setTranslationX(getTranslationX()+mx-x);
//    setTranslationY(getTranslationY()+my-y);

    layout(getLeft()+mx-x,getTop()+my-y,getLeft()+getMeasuredWidth()+mx-x,getTop()+getMeasuredHeight()+my-y);

    x = mx;
    y = my;
    break;
  }
  return true;
 }

UIGestureRecognizer

UIGestureRecognizer是一個(gè)抽象類，定義了所有手勢(shì)的基本行為，使用它的子類才能處理具體的手勢(shì)
UITapGestureRecognizer(敲擊)
UIPinchGestureRecognizer(捏合，用于縮放)
UIPanGestureRecognizer(拖拽)
UISwipeGestureRecognizer(輕掃)
UIRotationGestureRecognizer(旋轉(zhuǎn))
UILongPressGestureRecognizer(長(zhǎng)按)

//創(chuàng)建手勢(shì)識(shí)別器對(duì)象
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
//設(shè)置手勢(shì)識(shí)別器對(duì)象的具體屬性
// 連續(xù)敲擊2次
tap.numberOfTapsRequired = 2;
// 需要2根手指一起敲擊
tap.numberOfTouchesRequired = 2;
//添加手勢(shì)識(shí)別器到對(duì)應(yīng)的view上
[self.iconView addGestureRecognizer:tap];
監(jiān)聽手勢(shì)的觸發(fā)
[tap addTarget:self action:@selector(tapIconView:)];

//頁(yè)面加載完成時(shí)調(diào)用
- (void)viewDidLoad {
 [super viewDidLoad];
 //創(chuàng)建手勢(shì)識(shí)別器對(duì)象
  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
 //添加手勢(shì)識(shí)別器到對(duì)應(yīng)的view上
 [self.imageView addGestureRecognizer:pan];
}

- (void)pan:(UIPanGestureRecognizer *)pan
{
 // 獲取手勢(shì)的觸摸點(diǎn)
 // CGPoint curP = [pan locationInView:self.imageView];

 // 獲取手勢(shì)的移動(dòng)，也是相對(duì)于最開始的位置
 CGPoint transP = [pan translationInView:self.imageView];

 self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);

 // 復(fù)位
 [pan setTranslation:CGPointZero inView:self.imageView];
 //判斷當(dāng)前手指狀態(tài)
 //if (pan.state == UIGestureRecognizerStateBegan) {//手指按下時(shí)類似于Android中的ACTION_DOWN
 //}
}

// 沒有觸摸事件發(fā)生，所有手勢(shì)識(shí)別的默認(rèn)狀態(tài)
 UIGestureRecognizerStatePossible,
 // 一個(gè)手勢(shì)已經(jīng)開始但尚未改變或者完成時(shí)
 UIGestureRecognizerStateBegan,
 // 手勢(shì)狀態(tài)改變
 UIGestureRecognizerStateChanged,
 // 手勢(shì)完成
 UIGestureRecognizerStateEnded,
 // 手勢(shì)取消，恢復(fù)至Possible狀態(tài)
 UIGestureRecognizerStateCancelled, 
 // 手勢(shì)失敗，恢復(fù)至Possible狀態(tài)
 UIGestureRecognizerStateFailed,
 // 識(shí)別到手勢(shì)識(shí)別
 UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded 

#pragma mark - 手勢(shì)代理方法
// 是否允許開始觸發(fā)手勢(shì)
//- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
//{
// return NO;
//}

// 是否允許同時(shí)支持多個(gè)手勢(shì)，默認(rèn)是不支持多個(gè)手勢(shì)
// 返回yes表示支持多個(gè)手勢(shì)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
 return YES;
}

// 是否允許接收手指的觸摸點(diǎn)
//- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
// // 獲取當(dāng)前的觸摸點(diǎn)
// CGPoint curP = [touch locationInView:self.imageView];
//  return YES;
//}

// 事件傳遞的時(shí)候調(diào)用
// 當(dāng)事件傳遞給控件的時(shí)候，就會(huì)調(diào)用控件的這個(gè)方法，尋找最合適的view
// point：當(dāng)前的觸摸點(diǎn)，point這個(gè)點(diǎn)的坐標(biāo)系就是方法調(diào)用者
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
 // 調(diào)用系統(tǒng)的做法去尋找最合適的view，返回最合適的view
 UIView *fitView = [super hitTest:point withEvent:event];

// NSLog(@"fitView--%@",fitView);
 return fitView;
}

// 作用：判斷當(dāng)前這個(gè)點(diǎn)在不在方法調(diào)用者（控件）上
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
 return YES;
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{

 // 1.判斷當(dāng)前控件能否接收事件
 if (self.userInteractionEnabled == NO || self.hidden == YES || self.alpha <= 0.01) return nil;

 // 2. 判斷點(diǎn)在不在當(dāng)前控件
 if ([self pointInside:point withEvent:event] == NO) return nil;

 // 3.從后往前遍歷自己的子控件
 NSInteger count = self.subviews.count;

 for (NSInteger i = count - 1; i >= 0; i--) {
  UIView *childView = self.subviews[i];

  // 把當(dāng)前控件上的坐標(biāo)系轉(zhuǎn)換成子控件上的坐標(biāo)系
  CGPoint childP = [self convertPoint:point toView:childView];

  UIView *fitView = [childView hitTest:childP withEvent:event];


  if (fitView) { // 尋找到最合適的view
   return fitView;
  }
 }
 // 循環(huán)結(jié)束,表示沒有比自己更合適的view
 return self;
}