UISegmentedControl UISlider

    self.view.backgroundColor = [UIColor whiteColor];
    //UISegmentedControl 是iOS中的分段控件,事实上是多个button的组合视图,通过切换不同的segment(严格来说,点击不同的button),响应不同的操作.
    NSArray *titles = @[@"轻拍", @"长按",@"轻扫",@"平移"];
    UISegmentedControl *segmentControl = [[UISegmentedControl alloc] initWithItems:titles];
//    //设置默认选中的分段
    segmentControl.selectedSegmentIndex  = 0;
    segmentControl.frame = CGRectMake(10, 40, 300, 30);
//    //给segmentedControl加入响应事件
    [segmentControl addTarget:self action:@selector(handleSegmentControl:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:segmentControl];
    [segmentControl release];
    
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    view.backgroundColor = [UIColor blackColor];
    view.tag = 200;
    [self.view addSubview:view];
    [view release];

    //UISlider 滑块控件,比方控制音量,以及控制视频播放进度的滑杆.
    //滑竿上有一系列的值,代表了一个值的范围,滑动滑竿,依据滑竿的值做出对应的改变.
    UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(30, 60, 200, 30)];
    //设置滑竿的最大值
    slider.maximumValue = 1.0;
    //设置滑竿的最小值
    slider.minimumValue = 0.0;
    //给slider加入响应事件
    [slider addTarget:self action:@selector(handleSlider:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:slider];
    [slider release];
    //代码截屏
    //(1)设置要截屏的图片大小
    UIGraphicsBeginImageContext(self.view.frame.size);
    //(2)对哪个视图截图固定大小的图片
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
//    //(3)获取截图的图片对象
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
//    //(4)结束绘制图片
    UIGraphicsEndImageContext();
//    //(5)保存到相冊
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);