Application windows are expected to have a root view controller at the end of application launch问题分析

最新推荐文章于 2021-12-24 17:12:00 发布

原创最新推荐文章于 2021-12-24 17:12:00 发布 · 1.8k 阅读

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#iOS iphone #xcode 4

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博主在Xcode 4.3.2中新建项目并删除xib文件后，AppDelegate代码报错，提示应用窗口在启动结束时应具有根视图控制器。有人建议在特定方法里写代码，博主进行了相应修改，但仍在尝试解决该问题。

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Xcode 4.3.2中

我新建了一个项目，然后将xib文件删除掉了，我AppDelegate中的代码如下
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[MyViewController alloc] init] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
然后就老是报这个错Application windows are expected to have a root view controller at the end of application launch。有人说应该在- (void) applicationDidFinishLaunching:(UIApplication *)application里面写着写代码，我就将代码改为

-(void)applicationDidFinishLaunching:(UIApplication *)application

{

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[MyViewController alloc] init] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
return YES;
}

运行之后，黑屏什么都不显示。我又将代码改为

-(void)applicationDidFinishLaunching:(UIApplication *)application

{

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
   self.viewController = [[[MyViewController alloc] init] autorelease];
   self.window.rootViewController = self.viewController;
   [self.window makeKeyAndVisible];

return YES;
}

运行就不报错误了，界面也好了。但我感觉并没找到真正的解决原因，希望大家给予指导，谢谢！