FirstApp，iphone开发学习总结5，Slider改变Label的值

在总结4的基础上创建一个Slider，添加代码如下：

- (void)viewDidLoad
{
    //....
    UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(40.0, 200.0, 240.0, 20.0)];
    slider.minimumValue = 0;
    slider.maximumValue = 100;
    slider.value = 50;
    [slider addTarget:self action:@selector(sliderValueChange:) forControlEvents:UIControlEventValueChanged];
    
    [[self view] addSubview:slider];
    [slider release];
}

事件实现：

- (void)sliderValueChange:(id)sender
{
    UISlider *sli = (UISlider *)sender;
    resultLbl.text = [NSString stringWithFormat:@"%.2f",sli.value];
}

求规范，求指点。谢谢！