手勢，有規(guī)律的觸摸事件的封裝
手勢類，抽象類，使用他的子類
UIGestureRecognizer 手勢識別器

輕拍
UITapGestureRecognizer
長按
UILongPressGestureRecognizer
旋轉
UIRotationGestureRecognizer
捏合
UIPinchGestureRecognizer
平移
UIPanGestureRecognizer
清掃
UISwipeGestureRecognizer
屏幕邊緣清掃
UIScreenEdgePanGestureRecognizer


self.view.backgroundColor = [UIColor lightGrayColor];

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 100, 350, 350)];

imageView.backgroundColor = [UIColor greenColor];
[self.view addSubview:imageView];

imageView.image = [UIImage imageNamed:@"6.jpg"];
imageView.contentMode = UIViewContentModeCenter;
//imageView， label 的用戶交互默認是關閉的
imageView.userInteractionEnabled = YES;

//輕拍
//Target: 由誰來調用這個方法
//? 多態(tài) =>
{
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
    
   //需要輕拍幾次
   tap.numberOfTapsRequired = 1;
    //需要幾根手指
    tap.numberOfTouchesRequired = 1;
    
    //將輕拍手勢添加到imageView上，別的控件也可以添加手勢
    [imageView addGestureRecognizer:tap];

}

//清掃
//在平移方法實現(xiàn)的情況下，清掃的優(yōu)先級就沒有平移的高

// {
// UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
// //從左往右劃，沖右往左劃
// //對于NS_OPTIONS類型的枚舉，可以使用或（ | ）來連接多個值
// //不能同時支持上下左右滑動
// swipe.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;
// swipe.numberOfTouchesRequired = 1;
// [imageView addGestureRecognizer:swipe];
// }

//長按

// {
// UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAction:)];
//
// //長按運行了兩次
// [imageView addGestureRecognizer:longPress];
// }

//旋轉

// {
// UIRotationGestureRecognizer *rotain = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
//
// [imageView addGestureRecognizer:rotain];
// }

//平移
{
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
    
    [imageView addGestureRecognizer:pan];
    
    
}

//捏合
{
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
    [imageView addGestureRecognizer:pinch];
    
}

}

//方法寫在那里就是哪里的方法

• (void)tapAction:(UITapGestureRecognizer *)tap{

  NSLog(@"點擊");
  //tap.view 獲取手勢所在的視圖
  //強轉保證要強轉的類型就是你需要的類型
  UIImageView *imageView = (UIImageView *)tap.view;
  imageView.image = [UIImage imageNamed:@"3.jpg"];
  //怎么多次改變

}

• (void)swipeAction:(UISwipeGestureRecognizer *)swipe{

  NSLog(@"清掃");
  UIImageView *imageView = (UIImageView *)swipe.view;
  imageView.image = [UIImage imageNamed:@"3.jpg"];
  }

• (void)longAction:(UILongPressGestureRecognizer *)longPress{

  //判斷，在長按手勢生效的時候執(zhí)行一次代碼
  if (longPress.state == UIGestureRecognizerStateBegan) {

    NSLog(@"長按");
    UIImageView *imageView = (UIImageView *)longPress.view;
    imageView.image = [UIImage imageNamed:@"3.jpg"];
  

  }
  }

• (void)rotationAction:(UIRotationGestureRecognizer *)rotation{

// 動畫， transform2D放射變換

UIImageView *imageView = (UIImageView *)rotation.view;

imageView.transform = CGAffineTransformRotate(imageView.transform, rotation.rotation);
rotation.rotation = 0;

}

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

  UIImageView *imageView = (UIImageView *)pan.view;
  //獲取平移手勢在視圖上移動的距離
  CGPoint change = [pan translationInView:imageView];

imageView.transform = CGAffineTransformTranslate(imageView.transform, change.x , change.y);
[pan  setTranslation:CGPointZero inView:imageView];

}

• (void)pinchAction:(UIPinchGestureRecognizer *)pinch{

  UIImageView *imageView = (UIImageView *)pinch.view;
  imageView.transform = CGAffineTransformScale(imageView.transform, pinch.scale, pinch.scale);
  //復位
  pinch.scale = 1;
  }