IOS开发之UI进阶（UISegmentedControl原生选择框）

UISegmentedControl的简单使用

    //直接获取并强转为UISegmentedControl
    //除了强制转换获取还可以SB中拖线获取也是👌
    UISegmentedControl *seg = (UISegmentedControl *)self.navigationItem.titleView;
    //设置默认背景图片
    [seg setBackgroundImage:[UIImage imageNamed:@"name_no"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    //设置选中背景图片
    [seg setBackgroundImage:[UIImage imageNamed:@"name_sel"] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    //设置文字颜色
    [seg setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]} forState:UIControlStateNormal];
    [seg setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]} forState:UIControlStateSelected];
    //设置默认颜色
    [seg setTintColor:[UIColor clearColor]];

barMetrics枚举
UIBarMetricsDefault//横竖屏都显示
UIBarMetricsCompact//横屏显示，竖屏不显示
UIBarMetricsDefaultPrompt//竖屏有副标题显示 横屏有副标题不显示
UIBarMetricsCompactPrompt//竖屏有副标题不显示 横屏有副标题显示