导航栏仅显示在第1页，另一个不再显示

Question

我恢复了我的项目并得到了以下故事标题

在CollectionViewController中我有以下代码，我的问题是当我调用其他页面时，导航栏消失了

<pre> - (void)viewDidLoad {
    [super viewDidLoad];

    //navigation bar
    UIImage *image = [UIImage imageNamed:@"home.png"];
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    backButton.frame = CGRectMake(0, 0, 50, 50);
    [backButton setImage:image forState:UIControlStateNormal];
    UIBarButtonItem *button2 = [[UIBarButtonItem alloc] initWithCustomView:backButton];
    self.navigationItem.leftBarButtonItem = button2;
    self.title = @"Welcome User";

    marrImages=[[NSMutableArray alloc]init];

    mdictImageData=[[NSMutableDictionary alloc]initWithObjectsAndKeys:@"circlshadow_parking.png",@"imageFile",@"Parking",@"Info",nil];
    [marrImages addObject:mdictImageData];

}

-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[self navigationController] setNavigationBarHidden:NO animated:YES];
}


- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSUInteger lastIndex = [indexPath indexAtPosition:[indexPath length] - 1];
    if(lastIndex == 0)
    {
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        UIViewController *myVC = (UIViewController *)[storyboard instantiateViewControllerWithIdentifier:@"ParkingMenu"];
        myVC.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
        [self presentModalViewController:myVC animated:YES];  
    }
}<code>

Answer 1

根据Storyboard的设置，你真的应该使用segues而不是手动实例化和呈现视图控制器。

根据故事板截图中的模糊图标，看起来您已成功将其设置为“显示”细分。您的问题很可能存在于其他地方，但这肯定会让您采用更“标准”和最佳实践的做事方式。

要更正此问题，请在Collection View Controller和Parking Menu View Controller之间的segue上设置segue标识符。我们假设segue被识别为“ParkingMenuSegue”。然后，当您需要提供时，请使用：

<强>目标-C：

[self performSegueWithIdentifier:@"ParkingMenuSegue" sender:sender];

<强>夫特：

 performSegueWithIdentifier("ParkingMenuSegue", sender: nil)