ios多手势事件

开发ios应用时我们经常用到多手势来处理事情，如给scrollView增加点击事件，scrollView不能响应view的touch事件,但有时候却要用到多手势事件，那么我们可以给这个scrollView增加自己的手指事件。给imageView增加点击、放大、旋转等都可以通过多手势来完成。
下面就介绍下各种的手势的使用方法，及注意事项。
- (void)viewDidLoad

{
    [super viewDidLoad];
    //为了能响应多手势事件，imageView的userInteractionEnabled属性要设为YES.
    self.imageView.userInteractionEnabled=YES;

    //1、手指点击事件
    //单指单击
    UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                                                      action:@selector(fingerIncident:)];
//手指数
    singleFingerOne.numberOfTouchesRequired = 1;
//点击次数
    singleFingerOne.numberOfTapsRequired = 1;
//设置代理方法
    singleFingerOne.delegate= self;
//增加事件者响应者，
    [self.imageView addGestureRecognizer:singleFingerOne]; 

    //单指双击
    UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                                                      action:@selector(fingerIncident:)];
    singleFingerTwo.numberOfTouchesRequired = 1;
    singleFingerTwo.numberOfTapsRequired = 2;
    singleFingerTwo.delegate= self;
    [self.imageView addGestureRecognizer:singleFingerTwo];

    //双指单击
    UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                                                      action:@selector(fingerIncident:)];
    doubleFingerOne.numberOfTouchesRequired = 2;
    doubleFingerOne.numberOfTapsRequired = 1;
    doubleFingerOne.delegate= self;
    [self.imageView addGestureRecognizer:doubleFingerOne];

    //双指双击
    UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                                                      action:@selector(fingerIncident:)];
    doubleFingerTwo.numberOfTouchesRequired = 2;
    doubleFingerTwo.numberOfTapsRequired = 2;
    doubleFingerTwo.delegate= self;
    [self.imageView addGestureRecognizer:doubleFingerTwo];

    //如果不加下面的话，当单指双击时，会先调用单指单击中的处理，再调用单指双击中的处理
    [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];
    //同理双指也是如此
    [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

    //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:)];
    [self.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:)];
    [self.imageView addGestureRecognizer:rotateGesture];
    [rotateGesture release];

    //4、拖手势
    UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePanGesture:)];
    [self.imageView addGestureRecognizer:panGesture];
    [panGesture release];

    //当实现上面拖手势（UIPanGestureRecognizer）后将不能响应下面的左右划（UISwipeGestureRecognizer）事件，事件会被拖手势栏截，所以左右划和拖手势只能选其一
    //右划
    UISwipeGestureRecognizer *swipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];
    [self.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
    [self.imageView addGestureRecognizer:swipeLeftGesture];
    [swipeLeftGesture release];

    UILongPressGestureRecognizer *longpressGesutre=[[UILongPressGestureRecognizer alloc]initWithTarget:self
                                                                                                action:@selector(handleLongpressGesture:)];
    //长按时间为1秒
    longpressGesutre.minimumPressDuration=0.5;
    //允许15秒中运动
    longpressGesutre.allowableMovement=3;
    //所需触摸1次
    longpressGesutre.numberOfTouchesRequired=1;
    [self.imageView addGestureRecognizer:longpressGesutre];
    [longpressGesutre release];
}

//手指点击事件
- (void)fingerIncident:(UITapGestureRecognizer *)sender
{
    if (sender.numberOfTouchesRequired==1) {
        //单指点击事件
        if(sender.numberOfTapsRequired == 1) {
            //单指单击
            NSLog(@"单指单击");
            [sender.view.layer removeAllAnimations];
        }
        else if(sender.numberOfTapsRequired ==2 ){
            //单指双击
            NSLog(@"单指双击");
        }
    }
    else if (sender.numberOfTouchesRequired==2) {
        //双指点击事件
        if(sender.numberOfTapsRequired == 1) {
            //双指单击
            NSLog(@"双指单击");
        }
        else if(sender.numberOfTapsRequired ==2 ){
            //双指双击
            NSLog(@"双指双击");
        }
    }
}

//手指左右滑动事件
-(void)handleSwipeGesture:(UISwipeGestureRecognizer *)sender{
    if (sender.direction==UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"左滑");
    }
    else{
        NSLog(@"右滑");
    }
}

//手指捏事件
-(void)handlePinchGesture:(UIPinchGestureRecognizer *)sender{
    NSLog(@"捏");

    if([sender state] == UIGestureRecognizerStateEnded) {
        lastScale = 1.0;
        return;
    }

    CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]);

    CGAffineTransform newTransform = CGAffineTransformScale(sender.view.transform, scale, scale);

    [sender.view setTransform:newTransform];
    lastScale = [sender scale];
}

//手指旋转事件
-(void)handleRotateGesture:(UIRotationGestureRecognizer *)sender{
    NSLog(@"旋转");

    NSLog(@"sender.scale=%f",sender.rotation);
    NSLog(@"sender.velocity=%f",sender.velocity);

    sender.view.transform=CGAffineTransformRotate(sender.view.transform, sender.rotation);
    sender.rotation=0;
}

//手指拖事件
-(void)handlePanGesture:(UIPanGestureRecognizer *)sender{
    NSLog(@"拖");
    NSLog(@"sender＝%@",sender);
    CGPoint translation=[(UIPanGestureRecognizer*)sender translationInView:self.view];

    //开始
    if (sender.state==UIGestureRecognizerStateBegan) {
        x=sender.view.center.x;
        y=sender.view.center.y;
    }
    //进行中
    if (sender.state==UIGestureRecognizerStateChanged) {
        sender.view.center=CGPointMake(x+translation.x, y+translation.y);
    }
    //结束
    if (sender.state==UIGestureRecognizerStateEnded) {
        sender.view.center=CGPointMake(x+translation.x, y+translation.y);
    }
}

//手指长按事件
-(void)handleLongpressGesture:(UILongPressGestureRecognizer *)sender{
    NSLog(@"长按");
    if (sender.state==UIGestureRecognizerStateBegan) {
        CABasicAnimation* rotationAnimation_ = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
        //角度转弧度
        rotationAnimation_.fromValue = [NSNumber numberWithFloat:(-0.02)];
        rotationAnimation_.toValue = [NSNumber numberWithFloat:(0.02)];
        //动画时间
        rotationAnimation_.duration = 0.1f;
        //动画次数
        rotationAnimation_.repeatCount=FLT_MAX;
        //回退动画
        rotationAnimation_.autoreverses = YES;
        //动画开始结束的快慢，设置为加速
        rotationAnimation_.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        [[sender.view layer] addAnimation:rotationAnimation_ forKey:@"revItUpAnimation"];
    }
}