//
正常的window
UIKIT_EXTERNconstUIWindowLevel
UIWindowLevelNormal;
//
遮盖住状态栏的window
UIKIT_EXTERNconstUIWindowLevel
UIWindowLevelAlert;
//
遮盖住状态栏的window
UIKIT_EXTERNconstUIWindowLevel
UIWindowLevelStatusBar;
-
(void)makeKeyAndVisible;
//
convenience. most apps call this to show the main window and also make it key.
otherwise use view hidden property
除了makeKeyAndVisible方法设置主window,其他window可以使用hidden来显示。
原文地址:http://www.cnblogs.com/yangyang1987/p/3746726.html