IOS 七种手势详解（动图＋Demo下载）

原创Blog，转载请注明出处
blog.csdn.net/hello_hwc
欢迎关注我的博客专栏，这个关于IOS SDK的专栏我会持续更新
IOS SDK详解

前言：
触摸是交互的核心，而手势是触摸的上层封装，易于使用，不易出错。本文介绍了7种常用手势，多数手势我都配合Core Animation举了一个例子。给读者一些参考。最后，Demo的链接我会放到最后。

Demo源代码下载

CSDN下载
GitHub下载

一 UIGestureRecognizer

UIGestureRecognizer是一个抽象类，定义了手势所需的一些基本的属性和方法。当然，也可以自定义自己的手势，近期不会更新相关文章，所以不在本文的考虑范畴。七种子类是常用的也是IOS SDK提供的类。

UITapGestureRecognizer

UIPinchGestureRecognizer

UIRotationGestureRecognizer

UISwipeGestureRecognizer

UIPanGestureRecognizer

UIScreenEdgePanGestureRecognizer

UILongPressGestureRecognizer

一些常用的方法

位置信息

获得触摸的位置
- (CGPoint)locationInView:(UIView *)view

获得某一个触摸的位置
- (CGPoint)locationOfTouch:(NSUInteger)touchIndex
                    inView:(UIView *)view

当前手势有几个触摸
- (NSUInteger)numberOfTouches

State

这个很重要，因为要通过State来判断手势的情况

@property(nonatomic, readwrite) UIGestureRecognizerState state

绑定手势的view
@property(nonatomic, readonly) UIView *view

取消或者延迟

@property(nonatomic) BOOL cancelsTouchesInView
@property(nonatomic) BOOL delaysTouchesBegan
@property(nonatomic) BOOL delaysTouchesEnded

两个手势之间关系

- (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer

二 UITapGestureRecognizer

Demo的效果图－tap一下，图片抖动

第一个手势，我在storyboard上添加

然后，在响应手势的函数中添加动画

- (IBAction)tap:(UITapGestureRecognizer *)sender {
    CAKeyframeAnimation * animation = [CAKeyframeAnimation animation];
    animation.keyPath = @"position.x";
    NSInteger initalPositionX = self.imageview.layer.position.x;
    animation.values = @[@(initalPositionX),
                         @(initalPositionX + 10),
                         @(initalPositionX - 10),
                         @(initalPositionX + 10),
                         @(initalPositionX)];
    animation.keyTimes = @[
                           @(0),
                           @(1/6.0),
                           @(3/6.0),
                           @(5/6.0),
                           @(1)];
    animation.removedOnCompletion = YES;
    [self.imageview.layer addAnimation:animation forKey:@"keyFrame"];
}

属性和方法介绍

@property(nonatomic) NSUInteger numberOfTapsRequired //手势需要tap几下
@property(nonatomic) NSUInteger numberOfTapsRequired //手势需要几根手指

三 UIPinchGestureRecognizer

效果如－pinch则放大图片

实现代码

-(void)viewWillAppear:(BOOL)animated{
    CGRect imageFrame;
    //按照设备的不同调整大小
    if ([[UIDevice currentDevice].model isEqualToString:@"ipad"]) {
        imageFrame = CGRectMake(0,0,300,200);
    }else
    {
        imageFrame = CGRectMake(0,0,240,160);
    }
    self.imageview = [[UIImageView alloc] initWithFrame:imageFrame];
    self.imageview.image = [UIImage imageNamed:@"Image3.jpg"];
    self.imageview.center = self.view.center;
    [self.view addSubview:self.imageview];
    [self.imageview setUserInteractionEnabled:YES];
    //绑定手势
    UIPinchGestureRecognizer * pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    [self.imageview addGestureRecognizer:pinch];
    self.isLargeView = NO;
    self.oldFrame = self.imageview.frame;
}

-(void)pinch:(UIPinchGestureRecognizer *)pinch{
    if (pinch.state == UIGestureRecognizerStateRecognized) {
        if (!self.isLargeView && pinch.velocity > 0) {
            self.backgroundView = [[UIView alloc] initWithFrame:self.view.frame];
            self.backgroundView.backgroundColor = [UIColor blackColor];
            self.backgroundView.alpha = 0.0;
            self.imageview.backgroundColor = [UIColor blueColor];
            [self.view insertSubview:self.backgroundView belowSubview:self.imageview];
            [UIView animateWithDuration:0.8
                                  delay:0.0
                                options:UIViewAnimationOptionCurveEaseInOut
                             animations:^{
                                 self.backgroundView.alpha = 1.0;
                                 if ([[UIDevice currentDevice].model isEqualToString:@"ipad"]) {
                                     self.imageview.frame = CGRectMake(0,300,768,512);
                                 }else
                                 {
                                     self.imageview.frame = CGRectMake(0,220,320,210);
                                 }
                             }
                             completion:^(BOOL finished) {
                                 self.isLargeView = YES;

                             }];
        }
        if (self.isLargeView &&  pinch.velocity < 0) {
            [UIView animateWithDuration:0.8
                             animations:^{
                                 self.backgroundView.alpha = 0.0;
                                 self.imageview.frame = self.oldFrame;

                             }
                             completion:^(BOOL finished) {
                                 [self.backgroundView removeFromSuperview];
                                 self.backgroundView = nil;
                                 self.isLargeView = NO;
                             }];
        }
    }
}

属性和方法介绍
@property(nonatomic) CGFloat scale //scale的绝对值（相对最初的距离）
@property(nonatomic, readonly) CGFloat velocity //速度

四 UIRotationGestureRecognizer

效果如图－旋转

实现代码

-(void)viewDidLoad{
    self.imageview.userInteractionEnabled = YES;
    UIRotationGestureRecognizer * rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    [self.imageview addGestureRecognizer:rotate];
}
-(void)rotate:(UIRotationGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateChanged) {
        self.imageview.transform = CGAffineTransformMakeRotation(sender.rotation);
    }
}

属性和方法介绍
@property(nonatomic) CGFloat rotation //旋转的绝对值（相对最初）
@property(nonatomic, readonly) CGFloat velocity //速度

五 UISwipeGestureRecognizer

效果如图－翻页

实现代码

-(void)viewDidLoad{
    UISwipeGestureRecognizer * swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    swipe.numberOfTouchesRequired = 2;
    [swipe setDirection:UISwipeGestureRecognizerDirectionUp];
    [self.containview addGestureRecognizer:swipe];
    self.image2.userInteractionEnabled = YES;
    self.image2.hidden = YES;
    self.image3.userInteractionEnabled = YES;
    self.image3.hidden = NO;
}
-(void)swipe:(UISwipeGestureRecognizer *)sender{

    if (sender.state == UIGestureRecognizerStateRecognized) {
        [UIView transitionWithView:self.containview
                          duration:0.8
                           options:UIViewAnimationOptionTransitionCurlUp
                        animations:^{
                            self.image3.hidden = !self.image3.hidden;
                            self.image2.hidden = !self.image2.hidden;
                        } completion:^(BOOL finished) {

                        }];
    }

}

属性和方法介绍
@property(nonatomic) UISwipeGestureRecognizerDirection direction //方向
@property(nonatomic) NSUInteger numberOfTouchesRequired //需要的触摸（手指）数量

六 UIPanGestureRecognizer

效果如图－拖动图片随着移动，停止后回到原始位置

实现代码

-(void)viewDidLoad{
    CGRect imageFrame;
    if ([[UIDevice currentDevice].model isEqualToString:@"ipad"]) {
        imageFrame = CGRectMake(0,0,300,200);
    }else
    {
        imageFrame = CGRectMake(0,0,240,160);
    }

    self.imageview = [[UIImageView alloc] initWithFrame:imageFrame];
    self.imageview.image = [UIImage imageNamed:@"Image3.jpg"];
    self.imageview.center = self.view.center;
    [self.view addSubview:self.imageview];
    UIPanGestureRecognizer * pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    self.imageview.userInteractionEnabled = YES;
    [self.imageview addGestureRecognizer:pan];
    self.initalCenter = self.imageview.center;
}
-(void)pan:(UIPanGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateBegan) {

    }else if(sender.state == UIGestureRecognizerStateChanged){
        CGPoint translation = [sender translationInView:self.view];
        self.imageview.center = CGPointMake(self.initalCenter.x + translation.x,self.initalCenter.y + translation.y);
    }else{
        [UIView animateWithDuration:0.5
                              delay:0.0
                            options:UIViewAnimationOptionCurveEaseInOut animations:^{
                                self.imageview.center = self.initalCenter;
                            } completion:^(BOOL finished) {

                        }];
    }
}

属性方法介绍
@property(nonatomic) NSUInteger maximumNumberOfTouches //手势所需的最大手指数
@property(nonatomic) NSUInteger minimumNumberOfTouches //手势所需的最小手指数
- (CGPoint)translationInView:(UIView *)view //在view中移动的距离
- (CGPoint)velocityInView:(UIView *)view //移动速度

七 UIScreenEdgePanGestureRecognizer

效果如图－实现简单的侧拉效果

实现代码

-(void)viewDidLoad{
    UIScreenEdgePanGestureRecognizer * edge = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(edgePan:)];
    edge.edges = UIRectEdgeRight;
    [self.view addGestureRecognizer:edge];
}
-(void)edgePan:(UIScreenEdgePanGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateBegan) {
        self.edgeView = [[UIView alloc] initWithFrame:CGRectOffset(self.view.frame,CGRectGetWidth(self.view.frame),0)];
        self.edgeView.backgroundColor = [UIColor blueColor];
        self.offsetCenter = self.edgeView.center;
        [self.view addSubview:self.edgeView];
    }else if(sender.state == UIGestureRecognizerStateChanged){
        CGPoint translation = [sender translationInView:self.view];
        self.edgeView.center = CGPointMake(self.offsetCenter.x + translation.x,self.offsetCenter.y);
    }else if(sender.state == UIGestureRecognizerStateEnded)
    {
        if ([sender velocityInView:self.view].x < 0) {
            [UIView animateWithDuration:0.3 animations:^{
                self.edgeView.center = self.view.center;
            }];
        }else{
            [UIView animateWithDuration:0.3
                                  delay:0.0
                                options:UIViewAnimationOptionBeginFromCurrentState
                             animations:^{
                                 self.edgeView.center = self.offsetCenter;
                             }
                             completion:^(BOOL finished) {
                                 [self.edgeView removeFromSuperview];
                                 self.edgeView = nil;
                             }];
        }
    }else{
        [UIView animateWithDuration:0.3
                              delay:0.0
                            options:UIViewAnimationOptionBeginFromCurrentState
                         animations:^{
                             self.edgeView.center = self.offsetCenter;
                         }
                         completion:^(BOOL finished) {
                             [self.edgeView removeFromSuperview];
                             self.edgeView = nil;
                         }];
    }
}

属性和方法介绍
@property(readwrite, nonatomic, assign) UIRectEdge edges //哪些边缘添加edgePan

八 UILongPressGestureRecognizer

效果如图－长按删除图片

实现代码

-(void)viewDidLoad{
    self.imageview.userInteractionEnabled = YES;
    UILongPressGestureRecognizer * longpress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longpress:)];
    longpress.minimumPressDuration = 0.5;
    longpress.numberOfTapsRequired = 0;
    longpress.cancelsTouchesInView = YES;
    longpress.delegate = self;
    [self.imageview addGestureRecognizer:longpress];
}
-(void)longpress:(UILongPressGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateBegan){
        UIAlertView * alertview = [[UIAlertView alloc] initWithTitle:@"Warning"
                                                             message:@"Delete this image?"
                                                            delegate:self
                                                   cancelButtonTitle:@"Cancel"
                                                   otherButtonTitles:@"OK", nil];
        [alertview show];
        [sender cancelsTouchesInView];
    }
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 1) {
        [UIView animateWithDuration:1.0
                              delay:0.0
                            options:0
                         animations:^{
                             self.imageview.alpha = 0.0;
                         } completion:^(BOOL finished) {
                             [self.imageview removeFromSuperview];
                         }];
    }
    self.imageview.userInteractionEnabled = YES;
}

属性和方法介绍
@property(nonatomic) CFTimeInterval minimumPressDuration //手势识别的最小按压时间
@property(nonatomic) NSUInteger numberOfTouchesRequired //几根手指
@property(nonatomic) NSUInteger numberOfTapsRequired //识别手势需要的预先点击数目，通常为0
@property(nonatomic) CGFloat allowableMovement //允许移动的距离