视图不可见，直到多任务栏打开 - iPhone

Question

我第一次在iPhone 3.5英寸显示器上运行时出现自动布局崩溃ios 5.1 - 通过关闭自动布局来修复。但是，现在，当我运行应用程序时，屏幕是黑色的。只有当我双击主页按钮唤起多任务栏时，该视图才可见。奇怪，对吧？

应用程序启动时：

当唤起多任务处理。

代码片段：

if(screenSize.height == 480) { 
     // iPhone Classic 
     welcomeViewController = [welcomeViewController initWithNibName:@"WelcomeViewController~iphone3.5" bundle:nil]; 
     viewController = [viewController initWithNibName:@"selectZone~iphone3.5" bundle:nil]; 
     fixtureViewController = [fixtureViewController initWithNibName:@"fixture~iphone3.5" bundle:nil]; 

     [windowOldiPhone addSubview:fixtureViewController.view]; 
     [windowOldiPhone addSubview:viewController.view]; 
     [windowOldiPhone addSubview:welcomeViewController.view]; 
     [windowOldiPhone makeKeyAndVisible]; 
     [windowOldiPhone bringSubviewToFront:welcomeViewController.view]; 
    } 

注：这并不用iPhone/iPad运行iOS 6

Answer 1

呼叫bringSubviewToFront调用makeKeyAndVisible之前发生。像下面这样做

if(screenSize.height == 480) { 
     // iPhone Classic 
     welcomeViewController = [welcomeViewController initWithNibName:@"WelcomeViewController~iphone3.5" bundle:nil]; 
     viewController = [viewController initWithNibName:@"selectZone~iphone3.5" bundle:nil]; 
     fixtureViewController = [fixtureViewController initWithNibName:@"fixture~iphone3.5" bundle:nil]; 

     [windowOldiPhone addSubview:fixtureViewController.view]; 
     [windowOldiPhone addSubview:viewController.view]; 
     [windowOldiPhone addSubview:welcomeViewController.view]; 

     [windowOldiPhone bringSubviewToFront:welcomeViewController.view]; 
[windowOldiPhone makeKeyAndVisible]; 
    }