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1、北京尚学堂提供感觉有必要把iOS开发中的手势识别做一个小小的总结。在上一篇iOS开发之自定义表情键盘(组件封装与自动布局)博客中用到了一个轻击手势,就是在轻击Textview时从表情键盘回到系统键盘,在TextView中的手是用storyboard添加的。下面会先给出如何用storyboard给相应的控件添加手势,然后在用纯代码的方式给我们的控件添加手势,手势的用法比较简单。和button的用法类似,也是目标动作回调,话不多说,切入今天的正题。总共有六种手势识别:轻击手势(TapGestureRecognizer),轻扫手势(SwipeGestureRecognizer), 长按手势(Long
2、PressGestureRecognizer), 拖动手势(PanGestureRecognizer), 捏合手势(PinchGestureRecognizer),旋转手势(RotationGestureRecognizer);其实这些手势用touche事件完全可以实现,苹果就是把常用的触摸事件封装成手势,来提供给用户。读者完全可以用TouchesMoved来写拖动手势等一,用storyboard给控件添加手势识别,当然啦用storyboard得截张图啦1.用storyboard添加手势识别,和添加一个Button的步骤一样,首先我们得找到相应的手势,把手势识别的控件拖到我们要添加手势的控件中
3、,截图如下2.给我们拖出的手势添加回调事件,和给Button回调事件没啥区别的,在回调方法中添加要实现的业务逻辑即可,截图如下:二,纯代码添加手势识别用storyboard可以大大简化我们的操作,不过纯代码的方式还是要会的,就像 要Dreamwear编辑网页一样(当然啦,storyboard的拖拽功能要比Dreamwear的拖拽强大的多),用纯代码敲出来的更为灵活,更加便 于维护。不过用storyboard可以减少我们的工作量,这两个要配合着使用才能大大的提高我们的开发效率。个人感觉用storyboard把框架搭起 来(Controller间的关系),一下小的东西还是用纯代码敲出来更好一些。下
4、面就给出如何给我们的控件用纯代码的方式来添加手势识别。1.轻击手势(TapGestureRecognizer)的添加初始化代码TapGestureRecongnizer的代码如下: /新建tap手势 UITapGestureRecognizer *tapGesture = UITapGestureRecognizer alloc initWithTarget:self action:selector(tapGesture:); /设置点击次数和点击手指数 tapGesture.numberOfTapsRequired = 1; /点击次数 tapGesture.numberOfTouchesR
5、equired = 1; /点击手指数 self.view addGestureRecognizer:tapGesture;在回调方法中添加相应的业务逻辑: /轻击手势触发方法 -(void)tapGesture:(id)sender /轻击后要做的事情 2.长按手势(LongPressGestureRecognizer)初始化代码:/添加长摁手势 UILongPressGestureRecognizer *longPressGesture = UILongPressGestureRecognizer alloc initWithTarget:self action:selector(long
6、PressGesture:); /设置长按时间 longPressGesture.minimumPressDuration = 0.5; /(2秒) self.view addGestureRecognizer:longPressGesture;在对应的回调方法中添加相应的方法(当手势开始时执行): /常摁手势触发方法 -(void)longPressGesture:(id)sender UILongPressGestureRecognizer *longPress = sender; if (longPress.state = UIGestureRecognizerStateBegan) U
7、IAlertView *alter = UIAlertView alloc initWithTitle:提示 message:长按触发 delegate:nil cancelButtonTitle:取消 otherButtonTitles: nil; alter show; 代码说明:手势的常用状态如下开始:UIGestureRecognizerStateBegan改变:UIGestureRecognizerStateChanged结束:UIGestureRecognizerStateEnded取消:UIGestureRecognizerStateCancelled失败:UIGestureRe
8、cognizerStateFailed3.轻扫手势(SwipeGestureRecognizer)在初始化轻扫手势的时候得指定轻扫的方向,上下左右。 如果要要添加多个轻扫方向,就得添加多个轻扫手势,不过回调的是同一个方法。添加轻扫手势,一个向左一个向右,代码如下: /添加轻扫手势 UISwipeGestureRecognizer *swipeGesture = UISwipeGestureRecognizer alloc initWithTarget:self action:selector(swipeGesture:); /设置轻扫的方向 swipeGesture.direction = U
9、ISwipeGestureRecognizerDirectionRight; /默认向右 self.view addGestureRecognizer:swipeGesture; /添加轻扫手势 UISwipeGestureRecognizer *swipeGestureLeft = UISwipeGestureRecognizer alloc initWithTarget:self action:selector(swipeGesture:); /设置轻扫的方向 swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLef
10、t; /默认向右 self.view addGestureRecognizer:swipeGestureLeft;回调方法如下: /轻扫手势触发方法 -(void)swipeGesture:(id)sender UISwipeGestureRecognizer *swipe = sender; if (swipe.direction = UISwipeGestureRecognizerDirectionLeft) /向左轻扫做的事情 if (swipe.direction = UISwipeGestureRecognizerDirectionRight) /向右轻扫做的事情 4.捏合手势(Pi
11、nchGestureRecognizer)捏合手势初始化 /添加捏合手势 UIPinchGestureRecognizer *pinchGesture = UIPinchGestureRecognizer alloc initWithTarget:self action:selector(pinchGesture:); self.view addGestureRecognizer:pinchGesture;捏合手势要触发的方法(放大或者缩小图片): /捏合手势触发方法 -(void) pinchGesture:(id)sender UIPinchGestureRecognizer *gestu
12、re = sender; /手势改变时 if (gesture.state = UIGestureRecognizerStateChanged) /捏合手势中scale属性记录的缩放比例 _imageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale); /结束后恢复 if(gesture.state=UIGestureRecognizerStateEnded) UIView animateWithDuration:0.5 animations: _imageView.transform = CGAf
13、fineTransformIdentity;/取消一切形变 ; 5.拖动手势(PanGestureRecognizer)拖动手势的初始化/添加拖动手势 UIPanGestureRecognizer *panGesture = UIPanGestureRecognizer alloc initWithTarget:self action:selector(panGesture:); self.view addGestureRecognizer:panGesture;拖动手势要做的方法(通过translationInView获取移动的点,和TouchesMoved方法类似) /拖动手势 -(voi
14、d) panGesture:(id)sender UIPanGestureRecognizer *panGesture = sender; CGPoint movePoint = panGesture translationInView:self.view; /做你想做的事儿 6.旋转手势(RotationGestureRecognizer)旋转手势的初始化/添加旋转手势 UIRotationGestureRecognizer *rotationGesture = UIRotationGestureRecognizer alloc initWithTarget:self action:selector(rotationGesture:); self.view