UISegmentedControl UISlider

时间：2022-04-21 13:22:06
    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);

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