Question

我是移动开发人员的新手，请原谅我，如果其中一些似乎微不足道。但是我试图让一个基本的PageViewController在Xamarin iOS中运行，我有许多不同的注册控制器，用于app注册的不同阶段。因此，用户将填写第一页，单击“继续”并转到第二步，依此类推。

我使用了一个来自GitHub的示例PageViewController项目，并且在我的模拟器上工作正常。但是，当我尝试将其与我的注册控制器一起使用时，我收到错误

Foundation.MonoTouchException：抛出Objective-C异常。名称： NSUnknownKeyException原因：[ setValue：forUndefinedKey：]：此类不是键值符合编码的关键DateOfBirthText。

这是父视图控制器OnLoad方法

public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            _pageViewController = Storyboard.InstantiateViewController("SignInPageViewController") as UIPageViewController;
            _pageViewController.DataSource = new PageViewControllerDataSource(this, _userInput);

            var startVc = ViewControllerAtIndex(0);
            var viewControllers = new[] {startVc};

            _pageViewController.SetViewControllers(viewControllers, UIPageViewControllerNavigationDirection.Forward, false, null);
            _pageViewController.View.Frame = new CGRect(0, 0, View.Frame.Width, View.Frame.Size.Height - 50);
            AddChildViewController(_pageViewController);
            View.AddSubview(_pageViewController.View);
            _pageViewController.DidMoveToParentViewController(this);            
        }

它会在行上抛出错误

_pageViewController.SetViewControllers

这是子控制器的设计器代码，它试图加载到PageViewController并抛出错误

{
    [Register ("SigninViewControllerStageOne")]
    partial class SigninViewControllerStageOne
    {
        [Outlet]
        [GeneratedCode ("iOS Designer", "1.0")]
        UITextField DateOfBirthText { get; set; }

        [Outlet]
        [GeneratedCode ("iOS Designer", "1.0")]
        UITextField NameText { get; set; }

        [Outlet]
        [GeneratedCode ("iOS Designer", "1.0")]
        UIButton NextStepButton { get; set; }

        [Outlet]
        [GeneratedCode ("iOS Designer", "1.0")]
        UITextField PhoneNumberText { get; set; }

        [Outlet]
        [GeneratedCode ("iOS Designer", "1.0")]
        UILabel TitleLabel { get; set; }

        void ReleaseDesignerOutlets ()
        {
            if (DateOfBirthText != null) {
                DateOfBirthText.Dispose ();
                DateOfBirthText = null;
            }
            if (NameText != null) {
                NameText.Dispose ();
                NameText = null;
            }
            if (NextStepButton != null) {
                NextStepButton.Dispose ();
                NextStepButton = null;
            }
            if (PhoneNumberText != null) {
                PhoneNumberText.Dispose ();
                PhoneNumberText = null;
            }
            if (TitleLabel != null) {
                TitleLabel.Dispose ();
                TitleLabel = null;
            }
        }
    }
}

更新：完整堆栈跟踪

未处理的例外：

Foundation.MonoTouchException：抛出Objective-C异常。名称：   NSUnknownKeyException原因：[   setValue：forUndefinedKey：]：此类不是键值   符合编码的关键DateOfBirthText。

本机堆栈跟踪：

0 CoreFoundation 0x00958494   __exceptionPreprocess + 180

1 libobjc.A.dylib 0x08fd3e02   objc_exception_throw + 50

2 CoreFoundation 0x009580b1 - [NSException   提高] + 17

3基金会0x014777f8    - [NSObject（NSKeyValueCoding）setValue：forUndefinedKey：] + 282

4基金会0x013d1e6a   _NSSetUsingKeyValueSetter + 115

5 Foundation 0x013d1def    - [NSObject（NSKeyValueCoding）setValue：forKey：] + 295

6 UIKit 0x0397b931 - [UIViewController   setValue：forKey：] + 85

7基金会0x0140654b    - [NSObject（NSKeyValueCoding）setValue：forKeyPath：] + 384

8 UIKit 0x03bf8a62    - [UIRuntimeOutletConnection连接] + 132

9 libobjc.A.dylib 0x08fe800c - [NSObject   performSelector：] + 62

10 CoreFoundation 0x00881131 - [NSArray   makeObjectsPerformSelector：] + 273

11 UIKit 0x03bf70fc - [UINib   instantiateWithOwner：options：] + 2102

12 UIKit 0x03983380 - [UIViewController   _loadViewFromNibNamed：bundle：] + 429

13 UIKit 0x03983db8 - [UIViewController   loadView] + 189

14 UIKit 0x039841c4 - [UIViewController   loadViewIfRequired] + 154

15 UIKit 0x03984ab1 - [UIViewController   查看] + 35

16 UIKit 0x04038649    - [UIPageViewController _setViewControllers：withCurlOfType：fromLocation：direction：animated：notifyDelegate：completion：]   + 2250

17 UIKit 0x0403a76a    - [UIPageViewController setViewControllers：direction：animated：completion：] + 309
     18 p ??? 0x1a6a07cc 0x0 + 443156428

19 ??? 0x1a69f6d0 0x0 + 443152080

20 ??? 0x18d3200f 0x0 + 416489487

21 ??? 0x18d29c1d 0x0 + 416455709

22 BarPandaApp 0x001be859   mono_jit_runtime_invoke + 921

23 BarPandaApp 0x0027d0ce   mono_runtime_invoke + 142

24 BarPandaApp 0x0035e225 xamarin_trampoline   + 5605

25 UIKit 0x0397fb72 - [UIViewController   _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 44

26 UIKit 0x03984692 - [UIViewController   loadViewIfRequired] + 1384

27 UIKit 0x039d02bb    - [UINavigationController _layoutViewController：] + 52

28 UIKit 0x039d0b75    - [UINavigationController _updateScrollViewFromViewController：toViewController：] + 421

29 UIKit 0x039d0d1c    - [UINavigationController _startTransition：fromViewController：toViewController：] + 145

30 UIKit 0x039d2118    - [UINavigationController _startDeferredTransitionIfNeeded：] + 1038

31 UIKit 0x039d339e    - [UINavigationController __viewWillLayoutSubviews] + 68

32 UIKit 0x03bb84b7    - [UILayoutContainerView layoutSubviews] + 252

33 UIKit 0x038843d4    - [UIView（CALayerDelegate）layoutSublayersOfLayer：] + 810

34 libobjc.A.dylib 0x08fe8059 - [NSObject   performSelector：withObject：] + 70

35 QuartzCore 0x0b607096 - [CALayer   layoutSublayers] + 144

36 QuartzCore 0x0b5fa8b6   _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 388

37 QuartzCore 0x0b5fa71a   _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26

38 QuartzCore 0x0b5ecee7   _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 317

39 QuartzCore 0x0b621847   _ZN2CA11Transaction6commitEv + 561

40 QuartzCore 0x0b622108   _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92

41 CoreFoundation 0x0086a75e    CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 30

42 CoreFoundation 0x0086a6be   __CFRunLoopDoObservers + 398

43 CoreFoundation 0x0085f868   CFRunLoopRunSpecific + 504

44 CoreFoundation 0x0085f65b CFRunLoopRunInMode   + 123

45 UIKit 0x037ae2da - [UIApplication   _run] + 540

46 UIKit 0x037b3eb9 UIApplicationMain   + 160

47 ??? 0x18d27144 0x0 + 416444740

48 ??? 0x18d26ef4 0x0 + 416444148
     49 p ??? 0x18d249a0 0x0 + 416434592

50 ??? 0x18d24620 0x0 + 416433696

51 ??? 0x18d24823 0x0 + 416434211

52 BarPandaApp 0x001be859   mono_jit_runtime_invoke + 921

53 BarPandaApp 0x0027d0ce   mono_runtime_invoke + 142

54 BarPandaApp 0x002822d1   mono_runtime_exec_main + 401

55 BarPandaApp 0x00282095   mono_runtime_run_main + 645

56 BarPandaApp 0x0013a3d5 mono_jit_exec +   213

57 BarPandaApp 0x0036d73a xamarin_main +   2474

58 BarPandaApp 0x0036e351 main + 65

59 libdyld.dylib 0x094ada25 start + 1

Answer 1

实际上，我认为您不应该使用UIPageViewController来实现注册进度。

但是如果你只是需要它，我会为其他人写一个样本，你可以查看这个链接来获取它：

xamarin.ios implement PageController with images only code

我建议您使用UINavigationController，它可以满足您的所有需求，有一个例子：

这是AppDelegate的代码（覆盖方法＆＃34; FinishedLaunching＆＃34;）：

public override bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
    {
        SignUpStepViewController step1 = new SignUpStepViewController (1, UIColor.Red);
        SignUpStepViewController step2 = new SignUpStepViewController (2, UIColor.Green);
        SignUpStepViewController step3 = new SignUpStepViewController (3, UIColor.Blue);
        step1.SetNextController(step2);
        step2.SetNextController(step3);

        UINavigationController myNavigationController = new UINavigationController (step1);
        this.Window = new UIWindow (UIScreen.MainScreen.Bounds);
        this.Window.RootViewController = myNavigationController;
        this.Window.MakeKeyAndVisible ();
        return true;
    }

这是SignUpStepViewController的代码：

public class SignUpStepViewController : UIViewController
{
    public SignUpStepViewController (int index,UIColor color)
    {
        this.Title = "Step " + index;
        this.View.BackgroundColor = color;
    }

    public void SetNextController(SignUpStepViewController nextC)
    {
        UIBarButtonItem btnContinue = new UIBarButtonItem ("Continue",UIBarButtonItemStyle.Done, delegate {
            this.NavigationController.PushViewController(nextC,true);
        });
        this.NavigationItem.SetRightBarButtonItem (btnContinue,true);
    }
}

希望它可以帮到你。

如果您仍需要帮助，请将此消息留在此处，我会检查后者。

Xamarin上的PageViewController不会加载子内容

1 个答案: