Xcode错误：应用程序启动结束时预计会有一个根视图控制器

Question

我收到此错误（应用程序在应用程序启动结束时应该有一个根视图控制器），我不知道为什么？我期待像令牌这样的东西：38c866dd bb323b39 ffa73487 5e157ee5 a85e0b7c e90d56e9 fe145bcc 6c2c594b。但不是：（

真的希望有人能解决这个问题。谢谢你，请你花时间在这上面。

代码如下。

#import "AppDelegate.h"
#import "ViewController.h"

@implementation AppDelegate

@synthesize window;
@synthesize viewController;

 - (void)applicationDidFinishLaunching:(UIApplication *)application {    

[window addSubview:viewController.view];
//[self.window setRootViewController:viewController];

[window makeKeyAndVisible];

NSLog(@"Registering for push notifications...");    
[[UIApplication sharedApplication] 
 registerForRemoteNotificationTypes:
 (UIRemoteNotificationTypeAlert | 
  UIRemoteNotificationTypeBadge | 
  UIRemoteNotificationTypeSound)];

}

- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken { 

NSString *str = [NSString 
                 stringWithFormat:@"Device Token=%@",deviceToken];
NSLog(str);

}

- (void)application:(UIApplication *)app didFailToRegisterForRemoteNotificationsWithError:     (NSError *)err { 

NSString *str = [NSString stringWithFormat: @"Error: %@", err];
NSLog(str);    

}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {

for (id key in userInfo) {
    NSLog(@"key: %@, value: %@", key, [userInfo objectForKey:key]);
 }    

 }


- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
 }

@end

Answer 1

您的代码已过期。您不应该将视图控制器的视图添加为窗口的子视图。您应该将窗口的rootViewController属性设置为视图控制器：

window.rootViewController = viewController;