ios9应用程序窗口应具有根视图控制器

Question

发布后我遇到了崩溃：

  

2015-11-13 17：47：50.744 app [18380：611105] ***由于未捕获的异常终止应用程序＆＃39; NSInternalInconsistencyException＆＃39;，原因：   ＆＃39;应用程序窗口应具有根视图控制器   应用程序启动结束＆＃39;

我已经阅读了ios9和root视图控制器的其他问题，现在我的appdelegate：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    MainViewController *main = [[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];

    NSArray *windows = [[UIApplication sharedApplication] windows];
    for(UIWindow *window in windows) {
        NSLog(@"window: %@",window.description);
        if(window.rootViewController == nil){
            UIViewController *vc = [[UIViewController alloc]initWithNibName:nil bundle:nil];
            window.rootViewController = vc;
        }
    }

    self.window.rootViewController = main;
    [self.window setRootViewController:main];
    [self.window makeKeyAndVisible];

    return YES;
}

不幸的是问题仍然存在。

Answer 1

也许尝试摆脱循环：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    window.backgroundColor = [UIColor whiteColor];

    MainViewController *main = [[MainViewController alloc] initWithNibName:@"MainViewController" bundle:nil];
    window.rootViewController = main;
    self.window = window;

    [window makeKeyAndVisible];
    return YES;
}