iOS事件机制，以及不同手势使用touchesBegan等表现形式

#import "MyView.h" @implementation MyView -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {  for (UITouch *aTouch in touches) {  if (aTouch.tapCount == 2) {  // 处理双击事件  [self respondToDoubleTapGesture];  }  } } -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { } -(void)respondToDoubleTapGesture {  NSLog(@"respondToDoubleTapGesture"); } @end 

#import "MyView.h" #define HORIZ_SWIPE_DRAG_MIN 12 //水平滑动最小间距 #define VERT_SWIPE_DRAG_MAX 4 //垂直方向最大偏移量 @implementation MyView -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {  UITouch *aTouch = [touches anyObject];  // startTouchPosition是一个CGPoint类型的属性，用来存储当前touch事件的位置  self.startTouchPosition = [aTouch locationInView:self]; } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {  UITouch *aTouch = [touches anyObject];  CGPoint currentTouchPosition = [aTouch locationInView:self];  // 判断水平滑动的距离是否达到了设置的最小距离，并且是否是在接近直线的路线上滑动（y轴偏移量）  if (fabsf(self.startTouchPosition.x - currentTouchPosition.x) >= HORIZ_SWIPE_DRAG_MIN &&  fabsf(self.startTouchPosition.y - currentTouchPosition.y) <= VERT_SWIPE_DRAG_MAX)  {  // 满足if条件则认为是一次成功的滑动事件，根据x坐标变化判断是左滑还是右滑  if (self.startTouchPosition.x < currentTouchPosition.x) {  [self rightSwipe];//右滑响应方法  } else {  [self leftSwipe];//左滑响应方法  }  //重置开始点坐标值  self.startTouchPosition = CGPointZero;  } } -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {  //当事件因某些原因取消时，重置开始点坐标值  self.startTouchPosition = CGPointZero; } -(void)rightSwipe {  NSLog(@"rightSwipe"); } -(void)leftSwipe {  NSLog(@"leftSwipe"); } @end 

#import "MyView.h" @implementation MyView -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {  UITouch *aTouch = [touches anyObject];  //获取当前触摸操作的位置坐标  CGPoint loc = [aTouch locationInView:self];  //获取上一个触摸点的位置坐标  CGPoint prevloc = [aTouch previousLocationInView:self];  CGRect myFrame = self.frame;  //改变View的x、y坐标值  float deltaX = loc.x - prevloc.x;  float deltaY = loc.y - prevloc.y;  myFrame.origin.x += deltaX;  myFrame.origin.y += deltaY;  //重新设置View的显示位置  [self setFrame:myFrame]; } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { } -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { } @end 

#import "MyView.h" @implementation MyView {  BOOL pinchZoom;  CGFloat previousDistance;  CGFloat zoomFactor; } -(id)init {  self = [super init];  if (self) {  pinchZoom = NO;  //缩放前两个触摸点间的距离  previousDistance = 0.0f;  zoomFactor = 1.0f;  }  return self; } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {  if(event.allTouches.count == 2) {  pinchZoom = YES;  NSArray *touches = [event.allTouches allObjects];  //接收两个手指的触摸操作  CGPoint pointOne = [[touches objectAtIndex:0] locationInView:self];  CGPoint pointTwo = [[touches objectAtIndex:1] locationInView:self];  //计算出缩放前后两个手指间的距离绝对值（勾股定理）  previousDistance = sqrt(pow(pointOne.x - pointTwo.x, 2.0f) +  pow(pointOne.y - pointTwo.y, 2.0f));  } else {  pinchZoom = NO;  } } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {  if(YES == pinchZoom && event.allTouches.count == 2) {  NSArray *touches = [event.allTouches allObjects];  CGPoint pointOne = [[touches objectAtIndex:0] locationInView:self];  CGPoint pointTwo = [[touches objectAtIndex:1] locationInView:self];  //两个手指移动过程中，两点之间距离  CGFloat distance = sqrt(pow(pointOne.x - pointTwo.x, 2.0f) +  pow(pointOne.y - pointTwo.y, 2.0f));  //换算出缩放比例  zoomFactor += (distance - previousDistance) / previousDistance;  zoomFactor = fabs(zoomFactor);  previousDistance = distance;  //缩放  self.layer.transform = CATransform3DMakeScale(zoomFactor, zoomFactor, 1.0f);  } } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {  if(event.allTouches.count != 2) {  pinchZoom = NO;  previousDistance = 0.0f;  } } -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { } @end 转自：http://www.cnblogs.com/zhw511006/p/3517249.html