iphone - 在打开多任务栏之前视图不可见 - iPhone

Question

在 iPhone 3.5 英寸显示器 ios 5.1 上运行时，我第一次遇到自动布局崩溃 - 通过关闭自动布局来解决这个问题。但是，现在，当我运行应用程序时，屏幕是黑色的。仅当我双击主页按钮以唤起多任务栏时，该视图才可见。很奇怪，对吧？

在应用启动时：

当唤起多任务处理时。

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];
    }

注意：这不会发生在运行 iOS 6 的 iPhone/iPad 上。

Answer 1

先打电话bringSubviewToFront再打电话makeKeyAndVisible。像下面这样

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];
    }