implementation of 'application:supportedInterfaceOrientationsForWindow:': 'UIInterfaceOrientationMask' (aka
下面这个方法是写在AppDelegate.m文件中的锁定屏幕的方法:-(NSUInteger)application:(UIApplication*)applicationsupportedInterfaceOrientationsForWindow:(UIWindow*)window但是如果直接写这个方法会报下面的警告:Conflictingreturntypeinimplementationo