Ios 从欢迎屏幕推送视图控制器时出现问题

我有一个欢迎屏幕，只显示用户第一次打开应用程序时的情况。屏幕工作得很好，但我无法让它在用户单击“完成”时显示正常屏幕

以下是应用程序委托中创建正常屏幕的代码-

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

    if([[NSUserDefaults standardUserDefaults] boolForKey:@"TermsAccepted"]!=YES)
    {
        [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"TermsAccepted"];
    }

    // Override point for customization after application launch.
    FeedViewController *feedViewController = [[FeedViewController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc]  initWithRootViewController:feedViewController];
    [self.window addSubview:nav.view];
    self.window.rootViewController = nav;

    [self.window makeKeyAndVisible];

    self.tabBarController = [[UITabBarController alloc] init];
    [[UITabBar appearance] setTintColor:[UIColor redColor]];


    // FeedViewController
    feedViewController=[[FeedViewController alloc] init];
    feedViewController.tabBarItem.image=[UIImage imageNamed:@"Describe-Home_Icon_NormalArtboard-1"];
    feedViewController.title = @"Timeline";
    feedViewController.tabBarItem.title = nil;

    //TodayViewController
    TodayViewController *todayViewController = [[TodayViewController alloc] init];
    todayViewController.tabBarItem.image = [UIImage imageNamed:@"Today_Icon"];
    todayViewController.title = @"Today";
    todayViewController.tabBarItem.title = nil;

    //CreateViewController
    self.createViewController = [[CreateViewController alloc] init];
    self.createViewController.tabBarItem.image = [UIImage imageNamed:@"Create_Icon"];
    self.createViewController.title = @"Create";
    self.createViewController.tabBarItem.title = nil;

    //AlertViewController
    AlertsViewController *alertsViewController = [[AlertsViewController alloc] init];
    alertsViewController.tabBarItem.image=[UIImage imageNamed:@"Alerts_IconArtboard-1"];
    alertsViewController.title=@"Alerts";
    alertsViewController.tabBarItem.title = nil;

    //ProfileViewController
    ProfileViewController *profileViewController = [[ProfileViewController alloc] init];
    profileViewController.tabBarItem.image=[UIImage imageNamed:@"Profile_IconArtboard-1"];
    profileViewController.title=@"Profile";
    profileViewController.tabBarItem.title = nil;

    NSMutableArray *tabBarViewControllers = [[NSMutableArray alloc] initWithCapacity:2];

    self.tabBarController = [[UITabBarController alloc] init];


    UINavigationController *feedNavigationController = [[UINavigationController alloc] initWithRootViewController:feedViewController];
    [tabBarViewControllers addObject:feedNavigationController];
    feedNavigationController = nil;

    UINavigationController *todayNavigationController = [[UINavigationController alloc] initWithRootViewController:todayViewController];
    [tabBarViewControllers addObject:todayNavigationController];
    todayNavigationController = nil;

    UINavigationController *createNavigationController = [[UINavigationController alloc] initWithRootViewController:self.createViewController];
    [tabBarViewControllers addObject:createNavigationController];
    createNavigationController = nil;

    UINavigationController *alertsNavigationController = [[UINavigationController alloc] initWithRootViewController:alertsViewController];
    [tabBarViewControllers addObject:alertsNavigationController];
    alertsNavigationController = nil;

    UINavigationController *profileNavigationController = [[UINavigationController alloc] initWithRootViewController:profileViewController];
    [tabBarViewControllers addObject:profileNavigationController];
    profileNavigationController = nil;

    self.tabBarController.viewControllers = tabBarViewControllers;
    tabBarViewControllers = nil;

    [self.window addSubview:self.tabBarController.view];

    return YES;
}

在feedViewController中，按下欢迎视图控制器-

if ([[NSUserDefaults standardUserDefaults] boolForKey:@"TermsAccepted"]){
    NSLog(@"Second time opening the app");
}
else{
    WelcomeViewController *welcomeViewController = [[WelcomeViewController alloc] init];
    [self.navigationController pushViewController:welcomeViewController animated:NO];
}

回去喂不起作用的食物-

-(void)showDone:(UIButton *)sender {

    if (self.navigationItem.rightBarButtonItem.tintColor == [UIColor redColor]) {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"TermsAccepted"];

        FeedViewController *feedViewController = [[FeedViewController alloc] init];
        [[UIApplication sharedApplication] keyWindow].rootViewController = feedViewController;

        self.tabBarController.tabBar.hidden = NO;
        self.navigationController.navigationBar.hidden = NO;
    }
}

---

看起来，当您显示欢迎屏幕时，您将其推到

UINavigatonController

上。但是，当您单击“完成”时，您将尝试在窗口上设置根视图控制器，而不是从导航控制器中弹出视图控制器。看起来您正在创建

FeedViewController

的新实例，而不是使用已创建的实例

另外，您是否检查过它是否正在执行

showDone:

方法中的代码？您正在使用

=

将

UIBarButtonItem

的

tintColor

与

UIColor

进行比较，但是使用

=

只会在它们都是完全相同的

UIColor

实例时返回true，而它们可能不是。您需要使用方法

isEqual:

来比较两种颜色，因此您可以执行以下操作：

[self.navigationItem.rightBarButtonItem.tintColor isEqual:[UIColor redColor]]

请注意，如果颜色在不同的颜色空间中，对于相同的颜色，这并不总是返回

YES

，但大多数情况下，这应该是可行的

此外，您应该考虑将代码从应用程序委托中移出，因为通常“代码>应用程序：DIDFixIdStudioCopyOuts:仅用于启动时需要立即完成的事情。它不应用于初始化一组视图控制器，这些视图控制器只应在显示它们时初始化。

-（BOOL）应用程序：（UIApplication*）应用程序使用选项完成启动：（NSDictionary*）launchOptions（启动选项）

不是一个用来存放初始化应用程序所需的所有slop的槽。