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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