Iphone屏幕黑色啓動

Question

我正在開發一個iPhone應用程序併合並解析。最初是Parse.com的入門項目。這個文件使用了xib而不是storyboard;我刪除了xib並創建了自己的故事板，並將其更改爲主要故事板文件名稱庫：Main_iPhone，放在我的info.plist文件中。然後我拖出一個視圖控制器並設置指向該視圖控制器的小箭頭，但是當應用程序啓動時屏幕只是黑色。發生什麼事？ 這裏我代表AP代碼：

// 
// ParseStarterProjectAppDelegate.m 
// ParseStarterProject 
// 
// Copyright 2014 Parse, Inc. All rights reserved. 
// 

#import <Parse/Parse.h> 

// If you want to use any of the UI components, uncomment this line 
// #import <ParseUI/ParseUI.h> 

// If you are using Facebook, uncomment this line 
// #import <ParseFacebookUtils/PFFacebookUtils.h> 

// If you want to use Crash Reporting - uncomment this line 
// #import <ParseCrashReporting/ParseCrashReporting.h> 

#import "ParseStarterProjectAppDelegate.h" 


@implementation ParseStarterProjectAppDelegate 

#pragma mark - UIApplicationDelegate 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; 

    // Instantiate the initial view controller object from the storyboard 
    //self.window.rootViewController = [storyboard instantiateInitialViewController]; 

    // Enable storing and querying data from Local Datastore. Remove this line if you don't want to 
    // use Local Datastore features or want to use cachePolicy. 
    [Parse enableLocalDatastore]; 

    // **************************************************************************** 
    // Uncomment this line if you want to enable Crash Reporting 
    // [ParseCrashReporting enable]; 
    // 
    // Uncomment and fill in with your Parse credentials: 
    [Parse setApplicationId:@"privatecrap" clientKey:@"privatecrap"]; 
    // 
    // If you are using Facebook, uncomment and add your FacebookAppID to your bundle's plist as 
    // described here: https://developers.facebook.com/docs/getting-started/facebook-sdk-for-ios/ 
    // [PFFacebookUtils initializeFacebook]; 
    // **************************************************************************** 

    [PFUser enableAutomaticUser]; 

    PFACL *defaultACL = [PFACL ACL]; 

    // If you would like all objects to be private by default, remove this line. 
    [defaultACL setPublicReadAccess:YES]; 

    [PFACL setDefaultACL:defaultACL withAccessForCurrentUser:YES]; 

    // Override point for customization after application launch. 

    //self.window.rootViewController = self.viewController; 
    //[self.window makeKeyAndVisible]; 

    if (application.applicationState != UIApplicationStateBackground) { 
     // Track an app open here if we launch with a push, unless 
     // "content_available" was used to trigger a background push (introduced in iOS 7). 
     // In that case, we skip tracking here to avoid double counting the app-open. 
     BOOL preBackgroundPush = ![application respondsToSelector:@selector(backgroundRefreshStatus)]; 
     BOOL oldPushHandlerOnly = ![self respondsToSelector:@selector(application:didReceiveRemoteNotification:fetchCompletionHandler:)]; 
     BOOL noPushPayload = ![launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey]; 
     if (preBackgroundPush || oldPushHandlerOnly || noPushPayload) { 
      [PFAnalytics trackAppOpenedWithLaunchOptions:launchOptions]; 
     } 
    } 

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000 
    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) { 
     UIUserNotificationType userNotificationTypes = (UIUserNotificationTypeAlert | 
                 UIUserNotificationTypeBadge | 
                 UIUserNotificationTypeSound); 
     UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:userNotificationTypes 
                       categories:nil]; 
     [application registerUserNotificationSettings:settings]; 
     [application registerForRemoteNotifications]; 
    } else 
#endif 
    { 
     [application registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | 
                 UIRemoteNotificationTypeAlert | 
                 UIRemoteNotificationTypeSound)]; 
    } 



// self.window.rootViewController=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"emailStoryboard"]; 

    return YES; 
} 

/* 

/////////////////////////////////////////////////////////// 
// Uncomment this method if you are using Facebook 
/////////////////////////////////////////////////////////// 

- (BOOL)application:(UIApplication *)application 
      openURL:(NSURL *)url 
    sourceApplication:(NSString *)sourceApplication 
     annotation:(id)annotation { 
    return [PFFacebookUtils handleOpenURL:url]; 
} 

*/ 

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)newDeviceToken { 
    [PFPush storeDeviceToken:newDeviceToken]; 
    [PFPush subscribeToChannelInBackground:@"" target:self selector:@selector(subscribeFinished:error:)]; 
} 

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error { 
    if (error.code == 3010) { 
     NSLog(@"Push notifications are not supported in the iOS Simulator."); 
    } else { 
     // show some alert or otherwise handle the failure to register. 
     NSLog(@"application:didFailToRegisterForRemoteNotificationsWithError: %@", error); 
    } 
} 

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo { 
    [PFPush handlePush:userInfo]; 

    if (application.applicationState == UIApplicationStateInactive) { 
     [PFAnalytics trackAppOpenedWithRemoteNotificationPayload:userInfo]; 
    } 
} 

/////////////////////////////////////////////////////////// 
// Uncomment this method if you want to use Push Notifications with Background App Refresh 
/////////////////////////////////////////////////////////// 
/* 
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler { 
    if (application.applicationState == UIApplicationStateInactive) { 
     [PFAnalytics trackAppOpenedWithRemoteNotificationPayload:userInfo]; 
    } 
} 
*/ 

- (void)applicationWillResignActive:(UIApplication *)application { 
    /* 
    Sent when the application is about to move from active to inactive state. 
    This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) 
    or when the user quits the application and it begins the transition to the background state. 
    Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. 
    Games should use this method to pause the game. 
    */ 
} 

- (void)applicationDidEnterBackground:(UIApplication *)application { 
    /* 
    Use this method to release shared resources, save user data, invalidate timers, and store enough application state 
    information to restore your application to its current state in case it is terminated later. 
    If your application supports background execution, 
    this method is called instead of applicationWillTerminate: when the user quits. 
    */ 
} 

- (void)applicationWillEnterForeground:(UIApplication *)application { 
    /* 
    Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background. 
    */ 
} 

- (void)applicationDidBecomeActive:(UIApplication *)application { 
    /* 
    Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. 
    */ 
} 

- (void)applicationWillTerminate:(UIApplication *)application { 
    /* 
    Called when the application is about to terminate. 
    Save data if appropriate. 
    See also applicationDidEnterBackground:. 
    */ 
} 

#pragma mark -() 

- (void)subscribeFinished:(NSNumber *)result error:(NSError *)error { 
    if ([result boolValue]) { 
     NSLog(@"ParseStarterProject successfully subscribed to push notifications on the broadcast channel."); 
    } else { 
     NSLog(@"ParseStarterProject failed to subscribe to push notifications on the broadcast channel."); 
    } 
} 

@end 

Answer 1

如果你點擊左側的文件瀏覽器項目，在一般不會「主界面」包含你的故事板的名稱？

而且你說的（我認爲），那你的故事板是調用Main_iPhone，但是你的代碼是調用Main，然後用故事板無所作爲或檢查如果nil等

你要麼需要在目標中設置主界面，要麼在didFinishLaunchingWithOptions中初始化viewController，並將其設置爲窗口的rootViewController。例如

self.window.rootViewController=[[UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil] instantiateInitialViewController]; 

你不需要同時做兩個，只有一個或另一個。