ios手势识别(双击、捏、旋转、拖动、划动、长按, 上下左右滑动）

ios的手势操作之UIGestureRecognizer浅析

一、概述

iPhone中处理触摸屏的操作，在3.2之前是主要使用的是由UIResponder而来的如下4种方式：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

但是这种方式甄别不同的手势操作实在是麻烦，需要你自己计算做不同的手势分辨。后来。。。

苹果就给出了一个比较简便的方式，就是使用UIGestureRecognizer。

二、UIGestureRecognizer

UIGestureRecognizer基类

是一个抽象类，我们主要是使用它的子类（名字包含链接，可以点击跳到ios Developer library，看官方文档）：

UITapGestureRecognizer

UIPinchGestureRecognizer

UIRotationGestureRecognizer

UISwipeGestureRecognizer

UIPanGestureRecognizer

UILongPressGestureRecognizer

从名字上我们就能知道，

Tap（点击）、Pinch（捏合）、Rotation（旋转）、Swipe（滑动，快速移动，是用于监测滑动的方向的）、Pan （拖移，慢速移动，是用于监测偏移的量的）以及 LongPress（长按）。

举个例子，可以在viewDidLoad函数里面添加：

[cpp] view plaincopyprint?

-(void) viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanFrom:)];
[self.view addGestureRecognizer:panRecognizer];//关键语句，给self.view添加一个手势监测；
panRecognizer.maximumNumberOfTouches = 1;
panRecognizer.delegate = self;
[panRecognizer release];
}

其它手势方法类似。

其核心就是设置delegate和在需要手势监测的view上使用addGestureRecognizer添加指定的手势监测。

当然要记得在作为delegate的view的头文件加上<UIGestureRecognizerDelegate>。

不过有些手势是关联的，怎么办呢？例如 Tap 与 LongPress、Swipe与 Pan，或是 Tap 一次与Tap 兩次。

手势识别是具有互斥的原则的，比如单击和双击，如果它识别出一种手势，其后的手势将不被识别。所以对于关联手势，要做特殊处理以帮助程序甄别，应该把当前手势归结到哪一类手势里面。

比如，单击和双击并存时，如果不做处理，它就只能发送出单击的消息。为了能够识别出双击手势，就需要做一个特殊处理逻辑，即先判断手势是否是双击，在双击失效的情况下作为单击手势处理。使用

[A requireGestureRecognizerToFail：B]函数，它可以指定当A手势发生时，即便A已经滿足条件了，也不会立刻触发，会等到指定的手势B确定失败之后才触发。

[cpp] view plaincopyprint?

- (void)viewDidLoad
{
// 单击的 Recognizer
UITapGestureRecognizer* singleRecognizer;
singleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(SingleTap：)];
//点击的次数
singleTapRecognizer.numberOfTapsRequired = 1; // 单击

//给self.view添加一个手势监测；

[self.view addGestureRecognizer:singleRecognizer];

// 双击的 Recognizer
UITapGestureRecognizer* double;
doubleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(DoubleTap：)];
doubleTapRecognizer.numberOfTapsRequired = 2; // 双击
//关键语句，给self.view添加一个手势监测；
[self.view addGestureRecognizer:doubleRecognizer];

// 关键在这一行，双击手势确定监测失败才会触发单击手势的相应操作
[singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];
[singleRecognizer release];
[doubleRecognizer release];
}

-(void)SingleTap:(UITapGestureRecognizer*)recognizer
{
//处理单击操作
}

-(void)DoubleTap:(UITapGestureRecognizer*)recognizer
{
//处理双击操作
}

三、iphone操作手势的大概种类

1.点击(Tap)

点击作为最常用手势，用于按下或选择一个控件或条目（类似于普通的鼠标点击）、

2.拖动(Drag)

拖动用于实现一些页面的滚动，以及对控件的移动功能。

3.滑动(Flick)

滑动用于实现页面的快速滚动和翻页的功能。

4.横扫(Swipe)

横扫手势用于激活列表项的快捷操作菜单

5.双击(Double Tap)

双击放大并居中显示图片，或恢复原大小（如果当前已经放大）。同时，双击能够激活针对文字编辑菜单。

6.放大(Pinch open)

放大手势可以实现以下功能：打开订阅源，打开文章的详情。在照片查看的时候，放大手势也可实现放大图片的功能。

7.缩小(Pinch close)

缩小手势，可以实现与放大手势相反且对应的功能的功能：关闭订阅源退出到首页，关闭文章退出至索引页。在照片查看的时候，缩小手势也可实现缩小图片的功能。

8.长按(Touch &Hold)

在我的订阅页，长按订阅源将自动进入编辑模式，同时选中手指当前按下的订阅源。这时可直接拖动订阅源移动位置。

针对文字长按，将出现放大镜辅助功能。松开后，则出现编辑菜单。

针对图片长按，将出现编辑菜单。

9.摇晃(Shake)

摇晃手势，将出现撤销与重做菜单。主要是针对用户文本输入的。

/article/2292359.html

iOS－响应上下左右滑动手势

-(void)viewDidLoad{

UISwipeGestureRecognizer *recognizer;

recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];

[recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];

[[selfview] addGestureRecognizer:recognizer];

[recognizerrelease];

recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];

[recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];

[[selfview] addGestureRecognizer:recognizer];

[recognizerrelease];

recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];

[recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];

[[selfview] addGestureRecognizer:recognizer];

[recognizerrelease];

UISwipeGestureRecognizer *recognizer;

recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];

[recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];

[[selfview] addGestureRecognizer:recognizer];

[recognizerrelease];

}

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer{

if(recognizer.direction==UISwipeGestureRecognizerDirectionDown)
{

NSLog(@"swipe down");

//执行程序

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionUp)
{

NSLog(@"swipe up");

//执行程序

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft)
{

NSLog(@"swipe left");

//执行程序

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionRight)
{

NSLog(@"swipe right");

//执行程序

}

}

/article/9051453.html

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：

[cpp] view plaincopy

#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：

[cpp] view plaincopy

@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];
}