发射时Iphone屏幕黑色

Question

我正在开发一个iPhone应用程序并整合解析。最初是Parse.com的初级项目。此文件使用xib而不是storyboard;我删除了xib并制作了自己的故事板，并在我的info.plist文件中更改为主故事板文件名基：Main_iPhone。然后我拖出一个视图控制器并设置指向该视图控制器的小箭头，但是当应用程序启动时屏幕只是黑色。怎么了？ 这是我的ap代理代码：

//
//  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

如果您单击左侧文件资源管理器中的项目，一般情况下“主界面”是否包含故事板的名称？

你也说过（我认为）你的故事板是Main_iPhone，但你的代码正在调用Main，然后对故事板不做任何事情或检查它是否nil等

您需要在目标中设置主界面，或者在viewController内实例化初始didFinishLaunchingWithOptions并将其设置为窗口的rootViewController。 e.g。

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

你不需要同时做这两件事。