UIWindow - 02键盘和状态栏

• 键盘和状态栏其实都是窗口。
• 窗口是可以设置级别得。

UITextField *textF = [[UITextField alloc]init]; -- 创建键盘
[textF becomeFirstResponder]; -- 设置为第一响应者
[self.window addSubview:textF]; -- 将键盘添加到窗口上

• ⌘ + K 弹出键盘

//创建状态栏
self.stateWind = [[UIWindow alloc]initWithFrame:CGRectMake(0, 0, 375, 20)];
self.stateWind.backgroundColor = [UIColor blueColor];
UIViewController *viewController = [[UIViewController alloc]init];
self.stateWind.rootViewController = viewController;
[self.stateWind makeKeyAndVisible];

//设置窗口的等级
//等级一样,最后的覆盖上面得
//UIWindowLevelAlert > UIWindowLevelStatusBar > UIWindowLevelNormal
self.window.windowLevel = UIWindowLevelStatusBar;
self.stateWind.windowLevel = UIWindowLevelAlert;

• 示例图:

• 多个窗口之间,相同等级的情况下,最后的窗口覆盖上面的窗口
• 等级的划分:
  UIWindowLevelAlert > UIWindowLevelStatusBar > UIWindowLevelNormal
self.window.windowLevel = XX; //设置窗口的等级