iOS 拖动手势

@interface ViewController ()

{

    UIImageView * imageView; 要拖动的图片

    CGPoint  begin; 纪录开始拖动点

}

@end

 

@implementation ViewController

 

- (void)viewDidLoad

{

    [super viewDidLoad];

     imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];

    imageView.image =[UIImage imageNamed:@"1"];

    [self.view addSubview:imageView];

    

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch * touch = [touches anyObject];

   begin=[touch locationInView:imageView];开始点

    

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch * touch =[touches anyObject];

    CGPoint  last =[touch locationInView:imageView];移动点

    float offsetX=last.x-begin.x;

    float offsetY=last.y-begin.y;

    imageView.center=CGPointMake(imageView.center.x+offsetX, imageView.center.y+ offsetY);

    

    }

}

第二种

一、注册拖动动画

UIPanGestureRecognizer * panGestureRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self

                                                                                           action:@selector(doHandlePanAction:)];

    [self.vLight addGestureRecognizer:panGestureRecognizer];

 

注：vLight就是要加入拖动的View子类。

 

二、拖动处理函数

- (void) doHandlePanAction:(UIPanGestureRecognizer *)paramSender{

    

    CGPoint point = [paramSender translationInView:self.view];

    NSLog(@"X:%f;Y:%f",point.x,point.y);

    

    paramSender.view.center = CGPointMake(paramSender.view.center.x + point.x, paramSender.view.center.y + point.y);

    [paramSender setTranslation:CGPointMake(0, 0) inView:self.view];

    

 

}

第三者

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

   UITouch * touch =[touches anyObject];

//   lastPoint=[touch locationInView:self.helloWorldLabel];

    CGPoint point =[touch locationInView:self.helloWorldLabel];

    CGPoint Ppoint =[touch locationInView:self.helloWorldLabel];

    float x= point.x-Ppoint.x;

    float y= point.y-Ppoint.y;

    self.helloWorldLabel.center=CGPointMake(self.helloWorldLabel.center.x+x, self.helloWorldLabel.center.y+y);

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