Question

我的编码是

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

FirstTabBarItem = [[FirstMuseum alloc] init];
SecondTabBarItem = [[SecondMaps alloc] init];
ThirdTabBarItem = [[ThirdExhibition alloc] init];
FourthTabBarItem = [[FourthTabBarItem alloc] init];


first = [[UINavigationController alloc] initWithRootViewController:FirstTabBarItem];
second = [[UINavigationController alloc] initWithRootViewController:SecondTabBarItem];
third = [[UINavigationController alloc] initWithRootViewController:ThirdTabBarItem];
fourth = [[UINavigationController alloc] initWithRootViewController:FourthTabBarItem];


first.title = @"Hello";
second.title = @"Hello";
third.title = @"Hello";
fourth.title = @"Hello";

myControllerArray = [[NSMutableArray alloc] init];

[myControllerArray addObject:first];
[myControllerArray addObject:second];
[myControllerArray addObject:third];
[myControllerArray addObject:fourth];


myTabBar = [[UITabBarController alloc] init];

[myTabBar setViewControllers:myControllerArray];

localNavigationController = [[UINavigationController alloc] initWithRootViewController:myTabBar];

NSLog(@"Hello, You Tapped !");  }

什么是错误，我正在尝试使用四个项目制作UITabBarController，所以现在该怎么做 ??????

Answer 1

这意味着尝试推送的视图控制器尚未正确分配。请检查视图控制器的分配，看看它是否干净地分配

Answer 2

是的，你可以忘记分配视图控制器，所以试试我的代码：

1）tapaction表示按钮操作

_forgotviewcontroller means my second view property eg:

@property (nonatomic,strong) ForgotPassword *forgotviewController;

在我的第一次观看中声明

-(void) tapAction:(id)sender
{
    _forgotviewController=[[ForgotPassword alloc]init];
    [self.navigationController pushViewController:self.forgotviewController animated:YES];
}

试试这个你会得到导航

什么是错误“应用程序试图在目标上推送一个nil视图控制器<uinavigationcontroller：0x498efa0 =”“>。”？</uinavigationcontroller：>

2 个答案: