IOS  手势操作详解及实例总结篇

iOS手势操作总结

手势操作种类

• UITapGestureRecognizer: 敲击，点击
• UILongPressGestureRecognizer: 长按
• UIPinchGestureRecognizer: 缩放
• UIRotationGestureRecognizer: 旋转
• UISwipeGestureRecongizer: 轻扫
• UIPanGestureRecognizer: 拖拽

手势操作的代理方法(UIGestureRecognizerDelegate)

手势可能发生的条件，返回NO可以阻止此手势的发生或者此手势不产生任何效果

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;

是否允许多个手势同时发生

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)
gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:
(UIGestureRecognizer *)otherGestureRecognizer;

UITapGestureRecognier敲击，点击手势

• 设置属性numberOfTapsRequired可以指定需要几根手指才能触发事件
• numberOfTouchesRequired：可以设置需要敲击几次触发事件

 UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];

  // 设置代理
  tap.delegate = self;

  // 设置点击次数触发手势事件
  tap.numberOfTapsRequired = 1;

  // 设置需要点击的手指数
  tap.numberOfTouchesRequired = 1;

  [self.image addGestureRecognizer:tap];

UILongPressGestureRecongnizer长按

• minimumPressDuration设置长按的最小间隔时间，也就是说按下开始和手指离开时的中间间隔，如果小于这个值则不会被认为是长按操作
• allowableMovement：长按过程中是否允许移动

  UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];

  // 代理
  longPress.delegate = self;

  // 设置最小间隔时间, 手指按下与离开间隔时间
  longPress.minimumPressDuration = 1.0;

  // 按下过程中允许移动的像素
  longPress.allowableMovement = 30;

  [self.image addGestureRecognizer:longPress];

UIPinchGestureRecognizer缩放手势

scale: 设置缩放比例，相对于原来大小

 UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];

  // 代理
  pinch.delegate = self;

  // 设置缩放比例
  pinch.scale = 1.2;

  [self.image addGestureRecognizer:pinch];

UIRotationGestureRecognizer旋转手势

rotation: 旋转弧度，要保证每次都在上一次位置开始旋转，而不是回归初始位置，必须要在动作方法里将此值清零

- (void)setupRotation
{
  UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];

  // 设置代理
  rotation.delegate = self;

  [self.image addGestureRecognizer:rotation];
}

- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
  // 旋转角度
  CGFloat radian = rotation.rotation;

  self.image.transform = CGAffineTransformRotate(self.image.transform, radian);

  // 复位，保证每次都是在上一次位置开始转，而不是每次都回归初始位置再转
  rotation.rotation = 0;
}

UISwipeGestureRecognizer轻扫, 手指按下然后在屏幕上滑动

轻扫分四个方向（上下左右），并且如果要在一个控件上同时添加一个以上的轻扫动作，必须对每个动作添加一个对象。也就是说每个方向的动作对应一个对象。

direction: 指定轻扫动作的方向

typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
  UISwipeGestureRecognizerDirectionRight = 1 << 0, // 从左向右
  UISwipeGestureRecognizerDirectionLeft = 1 << 1, // 从右向左
  UISwipeGestureRecognizerDirectionUp  = 1 << 2, // 从下往上
  UISwipeGestureRecognizerDirectionDown = 1 << 3 // 从上往下
};

 UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];

  // 设置代理
  swipeUp.delegate = self;

  // 修改方向, 从下往上
  swipeUp.direction = UISwipeGestureRecognizerDirectionUp;

  [self.image addGestureRecognizer:swipeUp];

  // 添加其他方向手势
  UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];

  // 修改方向, 从下往上
  swipeDown.direction = UISwipeGestureRecognizerDirectionDown;

  [self.image addGestureRecognizer:swipeDown];

UIPanGestureRecognizer拖拽，按下拖动控件操作

注意点：手势的触摸点locationInView和手势的移动点translationInView是不一样的，前者是用locationInView取得是指手指在当前控件中的坐标，后者表示相对于父view的rect

  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];

  // 设置代理
  pan.delegate = self;

  [self.image addGestureRecognizer:pan];

  // 手势的触摸点
  // CGPoint p = [pan locationInView:self.image];

  // 手势的移动点(每次移动的位移点)
  CGPoint transP = [pan translationInView:self.image];

  NSLog(@"%f, %f", transP.x, transP.y);

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

  // 复位
  [pan setTranslation:CGPointZero inView:self.image];

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