WindowLevel是UIWindow的一個屬性。系統定義的一共有3種。
UIKIT_EXTERN const UIWindowLevel UIWindowLevelNormal;
UIKIT_EXTERN const UIWindowLevel UIWindowLevelAlert;
UIKIT_EXTERN const UIWindowLevel UIWindowLevelStatusBar;
代碼：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. NSLog(@"UIWindowLevelNormal=%f UIWindowLeveStatusBar=%f UIWindowLevelAlert=%f",UIWindowLevelNormal,UIWindowLevelStatusBar,UIWindowLevelAlert); return YES;}
輸出結果：
2015-07-19 21:02:45.448 WindowLevelDemo[775:24283] UIWindowLevelNormal=0.000000 UIWindowLeveStatusBar=1000.000000 UIWindowLevelAlert=2000.000000
參考資料：《iOS開發進階》-唐巧
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