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(LongPressGestureRecognizer), 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,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:
- 1 //新建tap手势
- 2 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
- 3 //设置点击次数和点击手指数
- 4 tapGesture.numberOfTapsRequired = 1; //点击次数
- 5 tapGesture.numberOfTouchesRequired = 1; //点击手指数
- 6 [self.view addGestureRecognizer:tapGesture];
在回调方法中添加相应的业务逻辑:
- 1 //轻击手势触发方法
- 2 -(void)tapGesture:(id)sender
- 3 {
- 4 //轻击后要做的事情
- 5 }
2.长按手势(LongPressGestureRecognizer)
初始化代码:
- //添加长摁手势
- 2 UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
- 3 //设置长按时间
- 4 longPressGesture.minimumPressDuration = 0.5; //(2秒)
- 5 [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):
- 1 //常摁手势触发方法
- 2 -(void)longPressGesture:(id)sender
- 3 {
- 4 UILongPressGestureRecognizer *longPress = sender;
- 5 if (longPress.state == UIGestureRecognizerStateBegan)
- 6 {
- 7 UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"长按触发" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil];
- 8 [alter show];
- 9 }
- 0 }
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:UIGestureRecognizerStateFailed
3.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:
- 1 //添加轻扫手势
- 2 UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
- 3 //设置轻扫的方向
- 4 swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; //默认向右
- 5 [self.view addGestureRecognizer:swipeGesture];
- 6
- 7 //添加轻扫手势
- 8 UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
- 9 //设置轻扫的方向
- 10 swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; //默认向右
- 11 [self.view addGestureRecognizer:swipeGestureLeft];
回调方法如下:
- 1 //轻扫手势触发方法
- 2 -(void)swipeGesture:(id)sender
- 3 {
- 4 UISwipeGestureRecognizer *swipe = sender;
- 5 if (swipe.direction == UISwipeGestureRecognizerDirectionLeft)
- 6 {
- 7 //向左轻扫做的事情
- 8 }
- 9 if (swipe.direction == UISwipeGestureRecognizerDirectionRight)
- 10 {
- 11 //向右轻扫做的事情
- 12 }
- 13 }
- 14
4.捏合手势(PinchGestureRecognizer)
捏合手势初始化
- //添加捏合手势
- 2 UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)];
- 3 [self.view addGestureRecognizer:pinchGesture];
捏合手势要触发的方法(放大或者缩小图片):
- 1 ////捏合手势触发方法
- 2 -(void) pinchGesture:(id)sender
- 3 {
- 4 UIPinchGestureRecognizer *gesture = sender;
- 5
- 6 //手势改变时
- 7 if (gesture.state == UIGestureRecognizerStateChanged)
- 8 {
- 9 //捏合手势中scale属性记录的缩放比例
- 10 _imageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);
- 11 }
- 12
- 13 //结束后恢复
- 14 if(gesture.state==UIGestureRecognizerStateEnded)
- 15 {
- 16 [UIView animateWithDuration:0.5 animations:^{
- 17 _imageView.transform = CGAffineTransformIdentity;//取消一切形变
- 18 }];
- 19 }
- 20 }
5.拖动手势(PanGestureRecognizer)
拖动手势的初始化
- //添加拖动手势
- 2 UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
- 3 [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)
- 1 //拖动手势
- 2 -(void) panGesture:(id)sender
- 3 {
- 4 UIPanGestureRecognizer *panGesture = sender;
- 5
- 6 CGPoint movePoint = [panGesture translationInView:self.view];
- 7
- 8 //做你想做的事儿
- 9 }
6.旋转手势(RotationGestureRecognizer)
旋转手势的初始化
- //添加旋转手势
- 2 UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
- 3 [self.view addGestureRecognizer:rotationGesture];
旋转手势调用的方法:
- 复制代码
- 1 //旋转手势
- 2 -(void)rotationGesture:(id)sender
- 3 {
- 4
- 5 UIRotationGestureRecognizer *gesture = sender;
- 6
- 7 if (gesture.state==UIGestureRecognizerStateChanged)
- 8 {
- 9 _imageView.transform=CGAffineTransformMakeRotation(gesture.rotation);
- 10 }
- 11
- 12 if(gesture.state==UIGestureRecognizerStateEnded)
- 13 {
- 14
- 15 [UIView animateWithDuration:1 animations:^{
- 16 _imageView.transform=CGAffineTransformIdentity;//取消形变
- 17 }];
- 18 }
- 19
- 20 }
本文链接:http://www.cnblogs.com/ludashi/p/3983008.html