在AppDelegate上显示条款和条件

Question

我想首先在appdelegate上显示条款的UIAlertController ，如果用户单击“同意”，则可以执行我的viewController，但是如果用户单击“取消”，则该应用程序应保留在启动屏幕上。 我有以下代码，但它显示了没有uinavigationController且没有功能的viewController。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.

    userDefaults = [NSUserDefaults standardUserDefaults];
    if (![userDefaults boolForKey:@"TermsAndConditions"]) {

        _window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
        _window.rootViewController = [[UIViewController alloc] init];
        _window.windowLevel = UIWindowLevelAlert;
        _window.backgroundColor = [UIColor prosenseWhiteColor];

        UIImageView *windowImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Defaulte"]];
        [windowImage setFrame:[UIScreen mainScreen].bounds];
        [windowImage setContentMode:UIViewContentModeScaleAspectFit];
        [_window addSubview:windowImage];

        [_window makeKeyAndVisible];

        NSString *path = [[NSBundle mainBundle] pathForResource:@"termsAndConditions" ofType:@"txt"];
        NSString *tsAndCs = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:NULL];

        UIAlertController *termsAndConditionsController = [UIAlertController alertControllerWithTitle:@"Terms and conditions" message:tsAndCs preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *agree = [UIAlertAction actionWithTitle:@"Agree" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){

            [self.window.rootViewController dismissViewControllerAnimated:YES completion:nil];

            [userDefaults setBool:YES forKey:@"TermsAndConditions"];
            [userDefaults synchronize];

                        UIStoryboard *st_board = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
                        PTPdfFileListViewController *pdfFileListView = (PTPdfFileListViewController*)[st_board instantiateViewControllerWithIdentifier:@"PTPdfFileListViewController"];
                        self.window.windowLevel = UIWindowLevelNormal;
                        [self.window makeKeyAndVisible];
                        [(UINavigationController*)self.window.rootViewController presentViewController:pdfFileListView animated:NO completion:nil];
        }];

        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action){
            NSLog(@"Cancel");
        }];

        [termsAndConditionsController addAction:cancel];
        [termsAndConditionsController addAction:agree];
        [_window.rootViewController presentViewController:termsAndConditionsController animated:YES completion:nil];

    }else {
        NSLog(@"accepted terms already");
    }
}

我做错了什么？

Answer 1

您应该以根用户身份将PTPdfFileListViewController嵌入UINavigationController中，并提供该UINavigationController。

Answer 2

尝试使用pushViewController代替presentViewController ，它将出现在主应用程序的导航控制器中。

用户将可以返回，因此我不确定这是您正在寻找的解决方案。

不带返回按钮的解决方案：

[(UINavigationController*)self.window.rootViewController setViewControllers:@[pdfFileListView] animated:NO];