ios 手势识别

手势识别在iOS上非常重要，手势操作移动设备的重要特征，极大的增加了移动设备使用便捷性。iOS 中手势包括：UITapGestureRecognizer(点击)，UIPinchGestureRecognizer(捏合)，UIRotationGestureRecognizer(旋转)，UISwipeGestureRecognizer(轻扫)，UIPanGestureRecognizer(移动)，UILongPressGestureRecognizer(长按)。上面的类属性和方法都比较简单，有几个方法个人感觉不容易理解的，在这里说明一下。

- (void)viewDidLoad {    [super viewDidLoad];    image1 = [[UIImageView alloc]initWithFrame:CGRectMake(80, 20, 200, 200)];    image1.image = [UIImage imageNamed:@"0.jpg"];    image1.userInteractionEnabled = YES;    [self.view addSubview:image1];    //点击    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];    [image1 addGestureRecognizer:tap];    //捏合    UIPinchGestureRecognizer *pin = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pin:)];    [image1 addGestureRecognizer:pin];    //旋转    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];    [image1 addGestureRecognizer:rotation];    //轻扫    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];    [image1 addGestureRecognizer:swipe];    //移动    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];    [image1 addGestureRecognizer:pan];    // Do any additional setup after loading the view, typically from a nib.}-(void) tap:(UITapGestureRecognizer *)gestureRecognizer{    CGPoint point1 = [gestureRecognizer locationInView:image1];    NSLog(@"point1 = %@",NSStringFromCGPoint(point1));}- (void)pin:(UIPinchGestureRecognizer *)gestureRecognizer{    NSLog(@"scale = %f;velocity = %f",gestureRecognizer.scale,gestureRecognizer.velocity);    image1.transform = CGAffineTransformMakeScale(gestureRecognizer.scale, gestureRecognizer.scale);}- (void)rotation:(UIRotationGestureRecognizer *)gestureRecognizer{    image1.transform = CGAffineTransformMakeRotation(gestureRecognizer.rotation);}- (void)swipe:(UISwipeGestureRecognizer *)gestureRecognizer{    image1.image = [UIImage imageNamed:@"2.jpg"];}- (void)pan:(UIPanGestureRecognizer *)gestureRecognizer{    //相对于手指开始的位置    CGPoint point1 = [gestureRecognizer translationInView:image1];    //相对于View左上角的位置    CGPoint point2 = [gestureRecognizer locationInView:image1];    CGFloat centerX  = image1.center.x;    CGFloat centerY = image1.center.y;    image1.center = CGPointMake(centerX + point1.x, centerY + point1.y);    //注意这里    [gestureRecognizer setTranslation:CGPointMake(0, 0) inView:image1];    NSLog(@"point1 = %@ ; point2 = %@",NSStringFromCGPoint(point1),NSStringFromCGPoint(point2));}

BLOG:http://www.cnblogs.com/yzvictory/p/5291111.html