iOS中簡單的手勢操作：長按、捏合、移動和旋轉

新建一個single view工程

ViewController.h文件

#import 

@interface ViewController : UIViewController {
    UIImageView *_imgView;
    float _rotation;
}
@end

ViewController.m文件

#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	
    _imgView = [[UIImageView alloc] initWithFrame:CGRectMake(110, 160, 100, 150)];
    _imgView.image = [UIImage imageNamed:@"10_0.jpg"];
    [self.view addSubview:_imgView];
    [_imgView release];
    
    _imgView.userInteractionEnabled = YES;
    
    //長按
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
//    longPress.minimumPressDuration = 0;//效果等於輕觸
    longPress.minimumPressDuration = 2;//最少按兩秒才會觸發事件
//    [_imgView addGestureRecognizer:longPress];
    [longPress release];
    
    //捏合
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchPress:)];
    [_imgView addGestureRecognizer:pinch];
    [pinch release];
    
    //移動
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [_imgView addGestureRecognizer:pan];
    [pan release];
    
    //旋轉
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    [_imgView addGestureRecognizer:rotation];
    [rotation release];
}

- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
    _imgView.transform = CGAffineTransformMakeRotation(_rotation + rotation.rotation);
    if (rotation.state == UIGestureRecognizerStateCancelled) {
        _rotation = rotation.rotation+_rotation;
    }
    NSLog(@"%f", _rotation);
}

- (void)pan:(UIPanGestureRecognizer *)pan 
{
    CGPoint point = [pan translationInView:self.view];
    _imgView.center = CGPointMake(_imgView.center.x+point.x, _imgView.center.y+point.y);
    [pan setTranslation:CGPointZero inView:self.view];//重置參考位置
}

- (void)pinchPress:(UIPinchGestureRecognizer *)pinch
{
    CGSize _imgSize = CGSizeMake(100, 150);
    float scale = pinch.scale;
    _imgView.bounds = CGRectMake(0, 0, _imgSize.width*scale, _imgSize.height*scale);
    //判斷手勢狀態
    if (pinch.state == UIGestureRecognizerStateCancelled) {
        _imgSize = _imgView.bounds.size;
    }
    if (_imgSize.height <= 75) {
        _imgSize.height = 75;
        _imgSize.width = 50;
    }
}

- (void)longPress:(UILongPressGestureRecognizer *)lp
{
    NSLog(@"長按");
}

@end