iphone - 包含导航栏和标签栏的 View 向下移动了大约 4mm

Question

在我的应用程序中，我从登录屏幕导航到一个类 classA ，就像这样

classA *objUserHome = [[classA alloc]init];
        [self presentModalViewController:objUserHome animated:YES];
        [objUserHome release];

ClassA 有一个导航栏和一个标签栏(里面有 5 个标签)，我已经像这样以编程方式创建了我的标签栏

- (void)viewDidLoad
{
    [super viewDidLoad];
    //Create tab bar controller and navigation bar controller

    tabBarController = [[UITabBarController alloc] init];

    NSMutableArray *arrControllers = [[NSMutableArray alloc] initWithCapacity:5];

    //Add PunchClock to tab View Controller
    PunchClock* objPunchClock = [[PunchClock alloc] initWithTabBar];
    NavigationController = [[UINavigationController alloc] initWithRootViewController:objPunchClock];
    NavigationController.navigationBar.tintColor = [UIColor brownColor];
    [arrControllers addObject:NavigationController];
    [NavigationController release];
    [objPunchClock release];

    //Add Time_Sheet to tab View Controller
    Time_Sheet* objTime_Sheet = [[Time_Sheet alloc] initWithTabBar];
    NavigationController = [[UINavigationController alloc] initWithRootViewController:objTime_Sheet];
    NavigationController.navigationBar.tintColor = [UIColor brownColor];
    [arrControllers addObject:NavigationController];
    [NavigationController release];
    [objTime_Sheet release];

    //Add PTO to tab View Controller
    PTO* objPTO = [[PTO alloc] initWithTabBar];
    NavigationController = [[UINavigationController alloc] initWithRootViewController:objPTO];
    NavigationController.navigationBar.tintColor = [UIColor brownColor];
    [arrControllers addObject:NavigationController];
    [NavigationController release];
    [objPTO release];

    //Add PunchClock to tab View Controller
    CrewPunch* objCrewPunch = [[CrewPunch alloc] initWithTabBar];
    NavigationController = [[UINavigationController alloc] initWithRootViewController:objCrewPunch];
    NavigationController.navigationBar.tintColor = [UIColor brownColor];
    [arrControllers addObject:NavigationController];
    [NavigationController release];
    [objCrewPunch release];

    //Add PunchClock to tab View Controller
    Reports* objReports = [[Reports alloc] initWithTabBar];
    NavigationController = [[UINavigationController alloc] initWithRootViewController:objReports];
    NavigationController.navigationBar.tintColor = [UIColor brownColor];
    [arrControllers addObject:NavigationController];
    [NavigationController release];
    [objReports release];

    // Add this view controller array into the tab bar

    //self .viewControllers = arrControllers;
     tabBarController .viewControllers = arrControllers;

    [arrControllers release];
    [self.view addSubview:[tabBarController view]];


}

而ClassA是继承自UIViewController

现在的问题是，在导航到 classA 之后，classA 的 View 向下移动了大约 4mm 为什么会这样？？我该如何解决这个问题，请提前帮助我，谢谢

Answer 1

在 2 个或更多 View 之间使用 Storyboard和Modal Transition 时，您可能会遇到与上述类似的错误。

如果您使用从 ViewControllerA 到 ViewControllerZ 的 Modal Transition，然后尝试从 进行 Modal Transition ViewControllerZ 回到 ViewControllerA 有时 ViewControllerA 的 View 会稍微向下推窗口。

这可以通过以下方式阻止:

[self.presentingViewController dismissViewControllerAnimated:YES completion:nil];

在 ViewControllerZ 上从 ViewControllerZ 上的事件返回到 ViewControllerA