手势识别器

创建一个UIImageView类的对象

注意要把对象imageView的交互开了

// 创建一个imageView 添加手势用    UIImage *image = [UIImage imageNamed:@"Selected"];    UIImageView *imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];    imageView.image = image;    imageView.userInteractionEnabled = YES;    [self.view addSubview:imageView];    [imageView release];

创建好imageView后 把创建的手势对象添加到imageView上去:

tap – 轻拍

手势类 UIGestureRecognizer
这个类是个抽象类 其具体功能 交给子类去实现
抽象类就是省代码的类

// 初始化一个轻拍手势的对象    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];// 添加手势到视图上    [imageView addGestureRecognizer:tap];// 释放    [tap release];

// 实现轻拍方法- (void)tapAction:(UITapGestureRecognizer *)tap{       NSLog(@"你拍我了, 很轻");       UIImageView *imageView = (UIImageView *)tap.view;       imageView.image = [UIImage imageNamed:@"Highlighted"];}

longPress – 长按

// 长按// 添加手势步骤// 1. 初始化手势 添加手势触发调用的方法// 2. 把手势添加到视图上// 3. 释放手势    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];// 设置长按时间    longPress.minimumPressDuration = 2.0;    [imageView addGestureRecognizer:longPress];    [longPress release];

// 实现长按手势- (void)longPressAction:(UILongPressGestureRecognizer *)longPress{    // 判断一下状态 长按 只需要出发一次方法    if (longPress.state == UIGestureRecognizerStateBegan) {        NSLog(@"长按触发了多少次");    }}

rotation – 旋转

 UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAciton:)];    [imageView addGestureRecognizer:rotation];    [rotation release];

// 实现旋转手势- (void)rotationAciton:(UIRotationGestureRecognizer *)rotation{    NSLog(@"旋转...跳跃...");// 形变属性 transform// 参数一 要改变对应视图的形变属性// 参数二 根据弧度去创建    rotation.view.transform = CGAffineTransformRotate(rotation.view.transform, rotation.rotation);// 每次转需要把旋转的角度 重置为0// 因为要接替上一次的角度 开始旋转    rotation.rotation = 0;}

pinch – 捏合

UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAciton:)];    [imageView addGestureRecognizer:pinch];    [pinch release];

// 实现捏合收拾方法- (void)pinchAciton:(UIPinchGestureRecognizer *)pinch{    NSLog(@"捏合");// 相册的捏合 跟这个手势 没什么关系// 根据缩放的刻度(比例)改变形变属性    pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);// 重置捏合的比例    pinch.scale = 1;}

pan – 平移

    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];    [imageView addGestureRecognizer:pan];    [pan release];

// 实现平移方法- (void)panAction:(UIPanGestureRecognizer *)pan{    NSLog(@"平移");// 获取平移的点(相对于要平移的视图)    CGPoint p = [pan translationInView:pan.view];    pan.view.transform = CGAffineTransformTranslate(pan.view.transform, p.x, p.y);    [pan setTranslation:CGPointMake(0, 0) inView:pan.view];}

swipe – 清扫

    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];    swipe.direction = UISwipeGestureRecognizerDirectionLeft;    [imageView addGestureRecognizer:swipe];    [swipe release];

// 实现轻扫方法- (void)swipeAction:(UISwipeGestureRecognizer *)swipe{    NSLog(@"左扫");}

screenEdgePan – 边缘扫

这个类继承于UIPanGestureRecognizer

 UIScreenEdgePanGestureRecognizer *screenEdgePan = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(screenEdgePanAction:)];// 设置下从哪个边缘开始扫    screenEdgePan.edges = UIRectEdgeRight;    [imageView addGestureRecognizer:screenEdgePan];    [screenEdgePan release];

// 实现边缘扫- (void)screenEdgePanAction:(UIScreenEdgePanGestureRecognizer *)screenEdgePan{    NSLog(@"一定是 靠近屏幕边缘开始扫 才能触发");}