ios实现无限图片跑马灯

-(void)startMove{    CGFloat w = CGRectGetWidth(self.frame);        _houseView = [[UIImageView alloc] init];    _houseView.image = [UIImage imageNamed:@"Anihouse"];    _houseView.frame =  CGRectMake(-w, 64, w*2, 45);    [self addSubview:_houseView];        [self animation];}- (void)animation{    CGFloat w = CGRectGetWidth(self.frame);        [UIView animateWithDuration:2.0                          delay:0                        options:UIViewAnimationOptionRepeat|UIViewAnimationOptionCurveLinear                     animations:^{                         _houseView.frame = CGRectMake(0, 64, w*2, 45);                     }                     completion:^(BOOL finished) {                     }     ];    }