UIWindow-WindowLevel，windowlevel

UIWindow-WindowLevel，windowlevel

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