iOS触摸移动动画

@interface ViewController ()

@property UIView *renview;

@end

@implementation ViewController

- (void)viewDidLoad

{

    UIView *renview=[[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];

    

    renview.backgroundColor=[UIColor blackColor];

    [self.view addSubview:renview];

    

    self.renview=renview;

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

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

    UITouch *touch=[touches anyObject];

    CGPoint location=[touch locationInView:self.view];

    CGPoint plocation=[touch previousLocationInView:self.view];

    CGPoint  deltapLocation=CGPointMake(location.x-plocation.x, location.y-plocation.y);

    

    CGPoint newcenter=CGPointMake(self.renview.center.x+deltapLocation.x, self.renview.center.y+deltapLocation.y);

 

    [self.renview setCenter:newcenter];

}