手势 Gesture

• (void)createLabel {
  label = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
  label.backgroundColor = [UIColor magentaColor];
  label.text = @"How old are you?";
  label.numberOfLines = 0;
  label.textColor = [UIColor blackColor];
  label.textAlignment = NSTextAlignmentCenter;
  label.userInteractionEnabled = YES;

  [self.view addSubview:label];
  }

• (void)createRotation {
  UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGesture:)];
  UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchGesture:)];
  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGesture:)];
  UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeGesture:)];
  swipeGesture.numberOfTouchesRequired = 1;
  swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight;

  [label addGestureRecognizer:swipeGesture];
  [label addGestureRecognizer:pan];
  [label addGestureRecognizer:pinch];
  [label addGestureRecognizer:rotation];
  }

• (void)rotationGesture:(UIRotationGestureRecognizer *)rotation {
  label.transform = CGAffineTransformRotate(label.transform, rotation.rotation);
  // 复位
  rotation.rotation = 0;
  }

-(void)pinchGesture:(UIPinchGestureRecognizer *)pinch {
label.transform = CGAffineTransformScale(label.transform, pinch.scale, pinch.scale);
// 复位
pinch.scale = 1;
}

• (void)panGesture:(UIPanGestureRecognizer *)pan{

  //获取偏移量
  // 返回的是相对于最原始的手指的偏移量
  CGPoint transP = [pan translationInView:label];
  // 移动图片控件
  label.transform = CGAffineTransformTranslate(label.transform, transP.x, transP.y);
  // 复位,表示相对上一次
  [pan setTranslation:CGPointZero inView:label];
  }

• (void)swipeGesture:(UISwipeGestureRecognizer *)swipe{
  NSLog(@"执行的swipe");
  swipe.direction = UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight;
  }