xcode4.2里自定义viewController和view切换

1)添加自定义 viewController

??在新版的view ? 和window工程里没有mainWindow.xib, 如何添加自定义的viewController为启示view,修改AppDelete.m文件

? ?self.viewController = [[coreDataViewController alloc]initWithNibName:@"coreDataViewController"bundle:nil];

关键是[self.window.addSubview:slef.viewController]或者是self.window.rootViewContrller = self.viewController;

2)多个view切换

??http://www.cnblogs.com/neozhu/archive/2012/02/16/2354568.html