iphone練習之手勢識別(雙擊、捏、旋轉、拖動、划動、長按）

首先新建一個基於Sigle view Application的項目，名爲GestureTest;個人項目結構以下：

往viewController.xib文件裏拖動一個imageView,並使覆蓋整個屏幕，改動屬性爲：

viewController.h文件：

 #import <UIKit/UIKit.h>

 @interface ViewController : UIViewController{
     IBOutlet UIImageView *imageView;
 }
 @property (nonatomic,retain)IBOutlet UIImageView *imageView;
 @end

並使xib文件裏的imageView與之鏈接；

而後是viewController.m文件的實現部分：

 @synthesize imageView;

 CGFloat lastScaleFactor=1;//放大、縮小
 CGFloat  netRotation;//旋轉
 CGPoint netTranslation;//平衡
 NSArray *images;//圖片數組
 int imageIndex=0;//數組下標

 - (void)viewDidLoad
 {
     //一、建立手勢實例，並鏈接方法handleTapGesture,點擊手勢
     UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTapGesture:)];
     //設置手勢點擊數,雙擊：點2下
     tapGesture.numberOfTapsRequired=2;
     // imageView添加手勢識別
     [imageView addGestureRecognizer:tapGesture];
     //釋放內存
     [tapGesture release];

     //二、手勢爲捏的姿式:按住option按鈕配合鼠標來作這個動做在虛擬器上
     UIPinchGestureRecognizer *pinchGesture=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinchGesture:)];
     [imageView addGestureRecognizer:pinchGesture];//imageView添加手勢識別
     [pinchGesture release];

     //三、旋轉手勢:按住option按鈕配合鼠標來作這個動做在虛擬器上
     UIRotationGestureRecognizer *rotateGesture=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotateGesture:)];
     [imageView addGestureRecognizer:rotateGesture];
     [rotateGesture release];

     //四、拖手勢
     UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePanGesture:)];
    // [imageView addGestureRecognizer:panGesture];
     [panGesture release];

     //五、划動手勢
     images=[[NSArray alloc]initWithObjects:@"cell.jpg",@"heihua.jpg",@"xuanyi.jpg", nil];
     //右劃
     UISwipeGestureRecognizer *swipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];
     [imageView addGestureRecognizer:swipeGesture];
     [swipeGesture release];
     //左劃
     UISwipeGestureRecognizer *swipeLeftGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];
     swipeGesture.direction=UISwipeGestureRecognizerDirectionLeft;//不設置黑夜是右
     [imageView addGestureRecognizer:swipeLeftGesture];
     [swipeLeftGesture release];

     //六、長按手勢
     UILongPressGestureRecognizer *longpressGesutre=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongpressGesture:)];
     //長按時間爲1秒
     longpressGesutre.minimumPressDuration=1;
     //容許15秒中運動
     longpressGesutre.allowableMovement=15;
     //所需觸摸1次
     longpressGesutre.numberOfTouchesRequired=1;
     [imageView addGestureRecognizer:longpressGesutre];
     [longpressGesutre release];

     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
 }
 //雙擊屏幕時會調用此方法,放大和縮小圖片
 -(IBAction)handleTapGesture:(UIGestureRecognizer*)sender{
     //判斷imageView的內容模式是不是UIViewContentModeScaleAspectFit,該模式是原比例，按照圖片原時比例顯示大小
     if(sender.view.contentMode==UIViewContentModeScaleAspectFit){
         //把imageView模式改爲UIViewContentModeCenter，按照圖片原先的大小顯示中心的一部分在imageView
         sender.view.contentMode=UIViewContentModeCenter;
     }else{
         sender.view.contentMode=UIViewContentModeScaleAspectFit;
     }
 }
 //捏的手勢，使圖片放大和縮小，捏的動做是一個連續的動做
 -(IBAction)handlePinchGesture:(UIGestureRecognizer*)sender{
     //獲得sender捏手勢的大小
     CGFloat factor=[(UIPinchGestureRecognizer*)sender scale];
     if(factor>1){
         //圖片放大
         sender.view.transform=CGAffineTransformMakeScale(lastScaleFactor+(factor-1), (lastScaleFactor+(factor-1)));

     }else{
         //縮小
         sender.view.transform=CGAffineTransformMakeScale(lastScaleFactor*factor, lastScaleFactor*factor);

     }
     //狀態是否結束，若是結束保存數據
     if(sender.state==UIGestureRecognizerStateEnded){
         if(factor>1){
             lastScaleFactor+=(factor-1);
         }else{
             lastScaleFactor*=factor;
         }
     }
 }
 //旋轉手勢
 -(IBAction)handleRotateGesture:(UIGestureRecognizer*)sender{
     //浮點類型，獲得sender的旋轉度數
     CGFloat rotation=[(UIRotationGestureRecognizer*)sender rotation];
     //旋轉角度CGAffineTransformMakeRotation
     CGAffineTransform transform=CGAffineTransformMakeRotation(rotation+netRotation);
     //改變圖像角度
     sender.view.transform=transform;
     //狀態結束，保存數據
     if(sender.state==UIGestureRecognizerStateEnded){
         netRotation+=rotation;
     }

 }
 //拖手勢
 -(IBAction)handlePanGesture:(UIGestureRecognizer*)sender{
     //獲得拖的過程當中的xy座標
     CGPoint translation=[(UIPanGestureRecognizer*)sender translationInView:imageView];
     //平移圖片CGAffineTransformMakeTranslation
     sender.view.transform=CGAffineTransformMakeTranslation(netTranslation.x+translation.x, netTranslation.y+translation.y);
     //狀態結束，保存數據
     if(sender.state==UIGestureRecognizerStateEnded){
         netTranslation.x+=translation.x;
         netTranslation.y+=translation.y;
     }

 }
 //划動手勢
 -(IBAction)handleSwipeGesture:(UIGestureRecognizer*)sender{
     //划動的方向
     UISwipeGestureRecognizerDirection direction=[(UISwipeGestureRecognizer*) sender direction];
     //判斷是上下左右
     switch (direction) {
         case UISwipeGestureRecognizerDirectionUp:
             NSLog(@"up");
             break;
         case UISwipeGestureRecognizerDirectionDown:
             NSLog(@"down");
             break;
         case UISwipeGestureRecognizerDirectionLeft:
             NSLog(@"left");
             imageIndex++;//下標++
             break;
         case UISwipeGestureRecognizerDirectionRight:
             NSLog(@"right");
             imageIndex--;//下標--
             break;
         default:
             break;
     }
     //獲得不越界不<0的下標
     imageIndex=(imageIndex<0)?([images count]-1):imageIndex%[images count];
     //imageView顯示圖片
     imageView.image=[UIImage imageNamed:[images objectAtIndex:imageIndex]];

 }
 //長按手勢
 -(IBAction)handleLongpressGesture:(UIGestureRecognizer*)sender{
     //建立警告
     UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:@"Image options" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"Save Image",@"Copy", nil];
     //當前view顯示警告
     [actionSheet showInView:self.view];
     [actionSheet release];
 }
 -(void)dealloc{
     [images release];
     [imageView release];
     [super dealloc];
 }