新手入门，关于xcode4.3下非storyboard的single view问题
我建立了一个single view工程，没有勾选storyboard，拖了一个按钮过去，然后编译，运行出来就出问题了，模拟器就是黑屏的

[解决办法]
self.switchViewController = [[XSwitchViewController alloc] initWithNibName:@"SwitchView" bundle:nil];
UIView *switchView = self.switchViewController.view;
CGRect switchViewFrame = switchView.frame;
switchViewFrame.origin.y = [UIApplication sharedApplication].statusBarFrame.size.height;
switchView.frame = switchViewFrame;
[self.window addSubview:switchView];