各种手势使用

Touch触摸
// 碰到屏幕就会触发该方法

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
  {
  NSLog(@"触碰到了");
  UITouch *touch = [touches anyObject];
  // 获取点击坐标
  CGPoint point = [touch locationInView:self.view];
  NSLog(@"%f, %f", point.x, point.y);
  }
  Tap点按
  UITapGestureRecognizer *doubleTgr = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTagr:)];
  // 点击的次数
  //doubleTgr.numberOfTapsRequired = 2;
  [self.imageView addGestureRecognizer:doubleTgr];
  LongPress长按
  UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(lpgrStart:)];
  [self.imageView addGestureRecognizer:lpgr];
  Swipe轻扫
  // 由于轻扫只能识别一个方向，所以把他的四个方向放在一个数组里留着以后辨别，这样就能识别四个方向了
  NSArray *arr = @[[NSNumber numberWithUnsignedInteger:UISwipeGestureRecognizerDirectionDown],[NSNumber numberWithUnsignedInteger:UISwipeGestureRecognizerDirectionUp],[NSNumber numberWithUnsignedInteger:UISwipeGestureRecognizerDirectionLeft],[NSNumber numberWithUnsignedInteger:UISwipeGestureRecognizerDirectionRight]];
  for (int i=0; i<arr.count; i++) {
  UISwipeGestureRecognizer *swiper = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swiper:)];
  //把方向取出来
  NSNumber *direction = arr[i];
  // 把方向转为Integer类型赋给轻扫的方向
  swiper.direction = [direction unsignedIntegerValue];
  [self.imageView addGestureRecognizer:swiper];
  }

• (void)swiper:(UISwipeGestureRecognizer *)swiper
  {
  if (swiper.direction == UISwipeGestureRecognizerDirectionDown) {
  NSLog(@"向下");
  }
  if (swiper.direction & UISwipeGestureRecognizerDirectionLeft) {
  NSLog(@"向左");
  }
  if (swiper.direction & UISwipeGestureRecognizerDirectionRight) {
  NSLog(@"向右");
  }
  if (swiper.direction & UISwipeGestureRecognizerDirectionUp) {
  NSLog(@"向上");
  }
  }
  Rotation旋转
  // 创建一个手势
  UIRotationGestureRecognizer *rotion = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotion:)];
  // 手势添加在控件上
  [self.imageView addGestureRecognizer:rotion];

• (void)rotion:(UIRotationGestureRecognizer *)rotion
  {
  NSLog(@"%f", rotion.rotation);
  rotion.view.transform = CGAffineTransformRotate(rotion.view.transform, rotion.rotation);
  // 由于此方法是旋转过程中反复调用的，所以旋转弧度很容易叠加，要及时清零才正常一点
  rotion.rotation = 0;
  }
  Pinch捏合
  UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];
  [self.imageView addGestureRecognizer:pinch];

• (void)pinch:(UIPinchGestureRecognizer *)pinch
  {
  // 放大缩小的比例
  NSLog(@"%f", pinch.scale);

  pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
  // 把伸缩比例及时变为1，防止伸缩效果叠加
  pinch.scale = 1;
  }
  Pan拖拽
  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
  [self.imageView addGestureRecognizer:pan] ;

• (void)pan:(UIPanGestureRecognizer *)pan
  {
  // 记录原来的位置
  static CGPoint center;

  if (pan.state == UIGestureRecognizerStateBegan) {
  center = pan.view.center;
  }

  // 获取偏移量
  CGPoint point = [pan translationInView:self.view];
  // 最后拖拽手势所在view的中心点，就是原来的位置加上变动的位置
  pan.view.center = CGPointMake(center.x + point.x, center.y + point.y);
  }
  Double手势叠加
  //可以添加多个手势
  // 一个控件可以添加多个手势，但一个手势不能添加在多个控件上
  添加多个手势时要遵守<UIGestureRecognizerDelegate>协议

// 返回yes，允许同时添加多个手势

• (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
  {
  return YES;
  }