ios-關於設置滾動條的默認值

關於設置滾動條的默認值

如何在每次應用返回背景時設置滾動條的默認值？

滾動條如下：

- (IBAction)slider1:(id)sender
{
    UISlider *slider = (UISlider *)sender;  //declare slider
    NSLog(@"%f",slider.value;
}

如何設置？

最佳回答：

添加 observer 到 UIApplicationWillEnterForegroundNotification

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willEnterForeground:) name:UIApplicationWillEnterForegroundNotification object:nil];


- (void)willEnterForeground:(NSNotification *)n {
    self.slider.value = 0.0f;
}