iphone练习之手势识别(双击、捏、旋转、拖动、划动、长按）

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：

#import <UIKit/UIKit.h>

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

@synthesize imageView;

CGFloat lastScaleFactor=1;//放大、缩小
CGFloat  netRotation;//旋转
CGPoint netTranslation;//平衡
NSArray *images;//图片数组
int imageIndex=0;//数组下标

- (void)viewDidLoad
{
    //1、创建手势实例，并连接方法handleTapGesture,点击手势
    UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTapGesture:)];
    //设置手势点击数,双击：点2下
    tapGesture.numberOfTapsRequired=2;
    // imageView添加手势识别
    [imageView addGestureRecognizer:tapGesture];
    //释放内存
    [tapGesture release];
    
    //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
    UIPinchGestureRecognizer *pinchGesture=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinchGesture:)];
    [imageView addGestureRecognizer:pinchGesture];//imageView添加手势识别
    [pinchGesture release];
    
    //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
    UIRotationGestureRecognizer *rotateGesture=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotateGesture:)];
    [imageView addGestureRecognizer:rotateGesture];
    [rotateGesture release];
    
    //4、拖手势
    UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePanGesture:)];
   // [imageView addGestureRecognizer:panGesture];
    [panGesture release];
    
    //5、划动手势
    images=[[NSArray alloc]initWithObjects:@"cell.jpg",@"heihua.jpg",@"xuanyi.jpg", nil];
    //右划
    UISwipeGestureRecognizer *swipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];
    [imageView addGestureRecognizer:swipeGesture];
    [swipeGesture release];
    //左划
    UISwipeGestureRecognizer *swipeLeftGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];
    swipeGesture.direction=UISwipeGestureRecognizerDirectionLeft;//不设置黑夜是右
    [imageView addGestureRecognizer:swipeLeftGesture];
    [swipeLeftGesture release];
    
    //6、长按手势
    UILongPressGestureRecognizer *longpressGesutre=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongpressGesture:)];
    //长按时间为1秒
    longpressGesutre.minimumPressDuration=1;
    //允许15秒中运动
    longpressGesutre.allowableMovement=15;
    //所需触摸1次
    longpressGesutre.numberOfTouchesRequired=1;
    [imageView addGestureRecognizer:longpressGesutre];
    [longpressGesutre release];
    
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}
//双击屏幕时会调用此方法,放大和缩小图片
-(IBAction)handleTapGesture:(UIGestureRecognizer*)sender{
    //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
    if(sender.view.contentMode==UIViewContentModeScaleAspectFit){
        //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
        sender.view.contentMode=UIViewContentModeCenter;
    }else{
        sender.view.contentMode=UIViewContentModeScaleAspectFit;
    }
}
//捏的手势，使图片放大和缩小，捏的动作是一个连续的动作
-(IBAction)handlePinchGesture:(UIGestureRecognizer*)sender{
    //得到sender捏手势的大小
    CGFloat factor=[(UIPinchGestureRecognizer*)sender scale];
    if(factor>1){
        //图片放大
        sender.view.transform=CGAffineTransformMakeScale(lastScaleFactor+(factor-1), (lastScaleFactor+(factor-1)));
                                                         
    }else{
        //缩小
        sender.view.transform=CGAffineTransformMakeScale(lastScaleFactor*factor, lastScaleFactor*factor);
                                                         
    }
    //状态是否结束，如果结束保存数据
    if(sender.state==UIGestureRecognizerStateEnded){
        if(factor>1){
            lastScaleFactor+=(factor-1);
        }else{
            lastScaleFactor*=factor;
        }
    }
}
//旋转手势
-(IBAction)handleRotateGesture:(UIGestureRecognizer*)sender{
    //浮点类型，得到sender的旋转度数
    CGFloat rotation=[(UIRotationGestureRecognizer*)sender rotation];
    //旋转角度CGAffineTransformMakeRotation
    CGAffineTransform transform=CGAffineTransformMakeRotation(rotation+netRotation);
    //改变图像角度
    sender.view.transform=transform;
    //状态结束，保存数据
    if(sender.state==UIGestureRecognizerStateEnded){
        netRotation+=rotation;
    }
     
}
//拖手势
-(IBAction)handlePanGesture:(UIGestureRecognizer*)sender{
    //得到拖的过程中的xy坐标
    CGPoint translation=[(UIPanGestureRecognizer*)sender translationInView:imageView];
    //平移图片CGAffineTransformMakeTranslation
    sender.view.transform=CGAffineTransformMakeTranslation(netTranslation.x+translation.x, netTranslation.y+translation.y);
    //状态结束，保存数据
    if(sender.state==UIGestureRecognizerStateEnded){
        netTranslation.x+=translation.x;
        netTranslation.y+=translation.y;
    }
    
}
//划动手势
-(IBAction)handleSwipeGesture:(UIGestureRecognizer*)sender{
    //划动的方向
    UISwipeGestureRecognizerDirection direction=[(UISwipeGestureRecognizer*) sender direction];
    //判断是上下左右
    switch (direction) {
        case UISwipeGestureRecognizerDirectionUp:
            NSLog(@"up");
            break;
        case UISwipeGestureRecognizerDirectionDown:
            NSLog(@"down");
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            NSLog(@"left");
            imageIndex++;//下标++
            break;
        case UISwipeGestureRecognizerDirectionRight:
            NSLog(@"right");
            imageIndex--;//下标--
            break;
        default:
            break;
    }
    //得到不越界不<0的下标
    imageIndex=(imageIndex<0)?([images count]-1):imageIndex%[images count];
    //imageView显示图片
    imageView.image=[UIImage imageNamed:[images objectAtIndex:imageIndex]];
    
}
//长按手势
-(IBAction)handleLongpressGesture:(UIGestureRecognizer*)sender{
    //创建警告
    UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:@"Image options" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"Save Image",@"Copy", nil];
    //当前view显示警告
    [actionSheet showInView:self.view];
    [actionSheet release];
}
-(void)dealloc{
    [images release];
    [imageView release];
    [super dealloc];
}

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！