xcode11创建新项目nav+tab无效
在AppDelegate里面写发现没有用:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { FirstViewController *first = [FirstViewController new]; UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:first]; UITabBarItem *item1 = [[UITabBarItem alloc]init]; item1.title = @"tab1"; item1.image = [UIImage imageNamed:@"iPhone_患者端首页_医院_未选中"]; nav1.tabBarItem = item1; SecondViewController *second = [SecondViewController new]; UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:second]; UITabBarItem *item2 = [[UITabBarItem alloc]init]; item2.title = @"tab2"; item2.image = [UIImage imageNamed:@"iPhone_患者端首页_医院_未选中"]; nav2.tabBarItem = item2; UITabBarController *tab = [[UITabBarController alloc] init]; tab.viewControllers = @[nav1,nav2]; self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; [self.window setBackgroundColor:[UIColor whiteColor]]; self.window.rootViewController = tab; [self.window makeKeyAndVisible]; return YES; }
怎么办呢?
解:
1. info.plist删除 Application Scene Manifest选项
2. 注释掉:
//- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options { // // Called when a new scene session is being created. // // Use this method to select a configuration to create the new scene with. // return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role]; //} // // //- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions { // // Called when the user discards a scene session. // // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions. // // Use this method to release any resources that were specific to the discarded scenes, as they will not return. //}
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