UISlider *_uislider;  //新建一个滑动条UILabel *_uilabel;    //新建一个label用来显示滑动的位置//滑动条
-(void)testSlider
{NSLog(@"begin slider");//设置滑动条slider的一些基本属性_uislider = [[UISlider alloc]init];_uislider.frame = CGRectMake(10, 365, 300, 50); //滑动条的位置，大小_uislider.minimumValue = 0;   //最小值_uislider.maximumValue = 500;  //最大值_uislider.value = 0;      //默认值//sliderValueChanged事件
    [_uislider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];//设置label的属性_uilabel = [[UILabel alloc]initWithFrame:CGRectMake(_uislider.frame.origin.x, _uislider.frame.origin.y-10, 70, 20)];[_uilabel setTextAlignment:UITextAlignmentCenter];[_uilabel setBackgroundColor:[UIColor clearColor]];//表示一开始为隐藏，不显示label，如果不用下面这句一开始进去是不显示label[_uilabel setAlpha:0.f];//_uilabel.text = @"aaaaaaaa";
    [self.view addSubview:_uislider];[self.view addSubview:_uilabel];
}-(void)sliderValueChanged:(id)sender
{UIImageView *imageView = [_uislider.subviews objectAtIndex:2];CGRect theRect = [self.view convertRect:imageView.frame fromView:imageView.superview];[_uilabel setFrame:CGRectMake(theRect.origin.x-22, theRect.origin.y-38, _uilabel.frame.size.width, _uislider.frame.size.height)];NSLog(@"slider value%f",_uislider.value);NSInteger v = _uislider.value+0.5;//label的显示数字。为滑动条移动后的位置的value [_uilabel setText:[NSString stringWithFormat:@"%d",v]];//动画效果[UIView animateWithDuration:0.5  animations:^{  [_uilabel setAlpha:1.f];}  completion:^(BOOL finished){  // 动画结束时的处理
     }];//[timer invalidate];timer = nil;timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(stopanimate) userInfo:nil repeats:NO];
}-(void)stopanimate
{[UIView animateWithDuration:0.5  animations:^{  [_uilabel setAlpha:0.f];}  completion:^(BOOL finished){  // 动画结束时的处理
                     }];
}