IOS问题汇总:2015-2-10 手势用法

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 }

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