ios - 无法弹出 iOS viewController。不确定，但我认为这与导航 Controller 有关

Question

我在尝试弹出 View 时遇到问题

应用委托(delegate)

@implementation MAAppDelegate
@synthesize navController;
@synthesize detailViewController;

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

    // Init the navController for the Master Detail View of the grade cells

    UINavigationController *navController = [[UINavigationController alloc] init];


    detailViewController = [[UIViewController alloc] init]; //step6
    navController = [[UINavigationController alloc] initWithRootViewController:[[MAController alloc] init]]; //step7


    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    self.window.rootViewController = navController; //step8
    [self.window makeKeyAndVisible];


    // Set MAController as rootViewController
    //self.window.rootViewController = [[MAController alloc] init];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];




    // Use the insanely cool TSMessages to show network alerts
    [TSMessage setDefaultViewController: self.window.rootViewController];
    return YES;
}

viewController的第一部分

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.


    [self.navigationController setNavigationBarHidden:YES];
    UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle:@"Home" style:UIBarButtonItemStyleBordered target:self action:@selector(home:)];
    self.navigationItem.leftBarButtonItem=newBackButton;

稍后，当我更改 viewController 时

    NSLog(@"Opened progress report");

    UIViewController *detailViewControl = [[UIViewController alloc] init];

    // Set progress report as the view controller
    [self.navigationController pushViewController:detailViewControl animated:YES];

    UIImage *background = [UIImage imageNamed:@"bg"];

    // Add static image bg
    self.backgroundImageView = [[UIImageView alloc] initWithImage:background];
    self.backgroundImageView.contentMode = UIViewContentModeScaleAspectFill;
    [self.view addSubview:self.backgroundImageView];

    // Add blurred layer to image when tableView goes in front of it
    self.blurredImageView = [[UIImageView alloc] init];
    self.blurredImageView.contentMode = UIViewContentModeScaleAspectFill;
    self.blurredImageView.alpha = 0;
    [self.blurredImageView setImageToBlur:background blurRadius:10 completionBlock:nil];
    [self.view addSubview:self.blurredImageView];



    [self.navigationController setNavigationBarHidden:NO];

所以我不明白为什么当我这样做时，按钮中的选择器(我知道会触发，因为我在日志中得到了 Righthtere):

    -(void)home:(UIBarButtonItem *)sender {
    NSLog(@"Righthtere");
    // Set progress report as the view controller
    [self.navigationController popToViewController:self animated:YES];

    }

它不会返回到初始 View Controller 。

Answer 1

您似乎混淆了 popToViewController 和 popViewControllerAnimated。 popViewControllerAnimated 从堆栈中移除当前 View ，并将新堆栈置于事件 View Controller 的顶部。 popToViewController 弹出堆栈，直到列出的 View Controller 位于堆栈顶部。

由于您正在使用 self 调用 popToViewController，它会查看请求的 View Controller 已经在堆栈顶部并且什么都不做。如果你想返回一个 View Controller ，那么你的电话应该是。

[self.navigationController popViewControllerAnimated:YES];