iphone练习之手势识别(双击、捏、旋转、拖动、划动、长按）

http://blog.csdn.net/rhljiayou/article/details/7553927

v

首先新建一个基于Sigle view Application的项目，名为GestureTest;我的项目结构如下：

往viewController.xib文件里拖动一个imageView,并使覆盖整个屏幕，改动属性为：

viewController.h文件：

[cpp] view plaincopy

1. #import <UIKit/UIKit.h>  
2.   
3. @interface ViewController : UIViewController{  
4.     IBOutlet UIImageView *imageView;  
5. }  
6. @property (nonatomic,retain)IBOutlet UIImageView *imageView;  
7. @end  

并使xib文件里的imageView与之连接；

然后是viewController.m文件的实现部分：

[cpp] view plaincopy

1. @synthesize imageView;  
2.   
3. CGFloat lastScaleFactor=1;//放大、缩小  
4. CGFloat  netRotation;//旋转  
5. CGPoint netTranslation;//平衡  
6. NSArray *images;//图片数组  
7. int imageIndex=0;//数组下标  
8.   
9. - (void)viewDidLoad  
10. {  
11.     //1、创建手势实例，并连接方法handleTapGesture,点击手势  
12.     UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTapGesture:)];  
13.     //设置手势点击数,双击：点2下  
14.     tapGesture.numberOfTapsRequired=2;  
15.     // imageView添加手势识别  
16.     [imageView addGestureRecognizer:tapGesture];  
17.     //释放内存  
18.     [tapGesture release];  
19.       
20.     //2、手势为捏的姿势:按住option按钮配合鼠标来做这个动作在虚拟器上  
21.     UIPinchGestureRecognizer *pinchGesture=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinchGesture:)];  
22.     [imageView addGestureRecognizer:pinchGesture];//imageView添加手势识别  
23.     [pinchGesture release];  
24.       
25.     //3、旋转手势:按住option按钮配合鼠标来做这个动作在虚拟器上  
26.     UIRotationGestureRecognizer *rotateGesture=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotateGesture:)];  
27.     [imageView addGestureRecognizer:rotateGesture];  
28.     [rotateGesture release];  
29.       
30.     //4、拖手势  
31.     UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePanGesture:)];  
32.    // [imageView addGestureRecognizer:panGesture];  
33.     [panGesture release];  
34.       
35.     //5、划动手势  
36.     images=[[NSArray alloc]initWithObjects:@"cell.jpg",@"heihua.jpg",@"xuanyi.jpg", nil];  
37.     //右划  
38.     UISwipeGestureRecognizer *swipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];  
39.     [imageView addGestureRecognizer:swipeGesture];  
40.     [swipeGesture release];  
41.     //左划  
42.     UISwipeGestureRecognizer *swipeLeftGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];  
43.     swipeGesture.direction=UISwipeGestureRecognizerDirectionLeft;//不设置黑夜是右  
44.     [imageView addGestureRecognizer:swipeLeftGesture];  
45.     [swipeLeftGesture release];  
46.       
47.     //6、长按手势  
48.     UILongPressGestureRecognizer *longpressGesutre=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongpressGesture:)];  
49.     //长按时间为1秒  
50.     longpressGesutre.minimumPressDuration=1;  
51.     //允许15秒中运动  
52.     longpressGesutre.allowableMovement=15;  
53.     //所需触摸1次  
54.     longpressGesutre.numberOfTouchesRequired=1;  
55.     [imageView addGestureRecognizer:longpressGesutre];  
56.     [longpressGesutre release];  
57.       
58.     [super viewDidLoad];  
59.     // Do any additional setup after loading the view, typically from a nib.  
60. }  
61. //双击屏幕时会调用此方法,放大和缩小图片  
62. -(IBAction)handleTapGesture:(UIGestureRecognizer*)sender{  
63.     //判断imageView的内容模式是否是UIViewContentModeScaleAspectFit,该模式是原比例，按照图片原时比例显示大小  
64.     if(sender.view.contentMode==UIViewContentModeScaleAspectFit){  
65.         //把imageView模式改成UIViewContentModeCenter，按照图片原先的大小显示中心的一部分在imageView  
66.         sender.view.contentMode=UIViewContentModeCenter;  
67.     }else{  
68.         sender.view.contentMode=UIViewContentModeScaleAspectFit;  
69.     }  
70. }  
71. //捏的手势，使图片放大和缩小，捏的动作是一个连续的动作  
72. -(IBAction)handlePinchGesture:(UIGestureRecognizer*)sender{  
73.     //得到sender捏手势的大小  
74.     CGFloat factor=[(UIPinchGestureRecognizer*)sender scale];  
75.     if(factor>1){  
76.         //图片放大  
77.         sender.view.transform=CGAffineTransformMakeScale(lastScaleFactor+(factor-1), (lastScaleFactor+(factor-1)));  
78.                                                            
79.     }else{  
80.         //缩小  
81.         sender.view.transform=CGAffineTransformMakeScale(lastScaleFactor*factor, lastScaleFactor*factor);  
82.                                                            
83.     }  
84.     //状态是否结束，如果结束保存数据  
85.     if(sender.state==UIGestureRecognizerStateEnded){  
86.         if(factor>1){  
87.             lastScaleFactor+=(factor-1);  
88.         }else{  
89.             lastScaleFactor*=factor;  
90.         }  
91.     }  
92. }  
93. //旋转手势  
94. -(IBAction)handleRotateGesture:(UIGestureRecognizer*)sender{  
95.     //浮点类型，得到sender的旋转度数  
96.     CGFloat rotation=[(UIRotationGestureRecognizer*)sender rotation];  
97.     //旋转角度CGAffineTransformMakeRotation  
98.     CGAffineTransform transform=CGAffineTransformMakeRotation(rotation+netRotation);  
99.     //改变图像角度  
100.     sender.view.transform=transform;  
101.     //状态结束，保存数据  
102.     if(sender.state==UIGestureRecognizerStateEnded){  
103.         netRotation+=rotation;  
104.     }  
105.        
106. }  
107. //拖手势  
108. -(IBAction)handlePanGesture:(UIGestureRecognizer*)sender{  
109.     //得到拖的过程中的xy坐标  
110.     CGPoint translation=[(UIPanGestureRecognizer*)sender translationInView:imageView];  
111.     //平移图片CGAffineTransformMakeTranslation  
112.     sender.view.transform=CGAffineTransformMakeTranslation(netTranslation.x+translation.x, netTranslation.y+translation.y);  
113.     //状态结束，保存数据  
114.     if(sender.state==UIGestureRecognizerStateEnded){  
115.         netTranslation.x+=translation.x;  
116.         netTranslation.y+=translation.y;  
117.     }  
118.       
119. }  
120. //划动手势  
121. -(IBAction)handleSwipeGesture:(UIGestureRecognizer*)sender{  
122.     //划动的方向  
123.     UISwipeGestureRecognizerDirection direction=[(UISwipeGestureRecognizer*) sender direction];  
124.     //判断是上下左右  
125.     switch (direction) {  
126.         case UISwipeGestureRecognizerDirectionUp:  
127.             NSLog(@"up");  
128.             break;  
129.         case UISwipeGestureRecognizerDirectionDown:  
130.             NSLog(@"down");  
131.             break;  
132.         case UISwipeGestureRecognizerDirectionLeft:  
133.             NSLog(@"left");  
134.             imageIndex++;//下标++  
135.             break;  
136.         case UISwipeGestureRecognizerDirectionRight:  
137.             NSLog(@"right");  
138.             imageIndex--;//下标--  
139.             break;  
140.         default:  
141.             break;  
142.     }  
143.     //得到不越界不<0的下标  
144.     imageIndex=(imageIndex<0)?([images count]-1):imageIndex%[images count];  
145.     //imageView显示图片  
146.     imageView.image=[UIImage imageNamed:[images objectAtIndex:imageIndex]];  
147.       
148. }  
149. //长按手势  
150. -(IBAction)handleLongpressGesture:(UIGestureRecognizer*)sender{  
151.     //创建警告  
152.     UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:@"Image options" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"Save Image",@"Copy", nil];  
153.     //当前view显示警告  
154.     [actionSheet showInView:self.view];  
155.     [actionSheet release];  
156. }  
157. -(void)dealloc{  
158.     [images release];  
159.     [imageView release];  
160.     [super dealloc];  
161. }  

嗯，试试效果吧！

本博客是我自己的练习，有好多地方没有讲太清楚，还请谅解！