[绍棠] iOS手势识别(双击、捏、旋转、拖动、划动、长按）详解

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

UIImageView
*imageView;

//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];

//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];

}