PageViewController on Xamarin will not load child content - ios

Question

I am quite new to mobile dev so forgive me if some of this seems trivial. But I am trying to get a basic PageViewController working in Xamarin iOS with a number of different sign up controllers I have, for different stages of the app signup. So a user will fill in page one, click continue and be taken to step two and so forth.
I used a sample PageViewController project from GitHub and got that working on my simulator fine. However when I try and use it with my sign up controllers, I get an error
Foundation.MonoTouchException: Objective-C exception thrown. Name:
NSUnknownKeyException Reason: [
setValue:forUndefinedKey:]: this class is not key value
coding-compliant for the key DateOfBirthText.
This is the parent view controller OnLoad method
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);
}
It throws the error on line
_pageViewController.SetViewControllers
And this is the designer code for the child controller that tries to be loaded into the PageViewController and throws the error
{
[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;
}
}
}
}
Update: Full stack trace
Unhandled Exception:
Foundation.MonoTouchException: Objective-C exception thrown. Name:
NSUnknownKeyException Reason: [
setValue:forUndefinedKey:]: this class is not key value
coding-compliant for the key DateOfBirthText.
Native stack trace:
0 CoreFoundation 0x00958494
__exceptionPreprocess + 180
1 libobjc.A.dylib 0x08fd3e02
objc_exception_throw + 50
2 CoreFoundation 0x009580b1 -[NSException
raise] + 17
3 Foundation 0x014777f8
-[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
4 Foundation 0x013d1e6a
_NSSetUsingKeyValueSetter + 115
5 Foundation 0x013d1def
-[NSObject(NSKeyValueCoding) setValue:forKey:] + 295
6 UIKit 0x0397b931 -[UIViewController
setValue:forKey:] + 85
7 Foundation 0x0140654b
-[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 384
8 UIKit 0x03bf8a62
-[UIRuntimeOutletConnection connect] + 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
view] + 35
16 UIKit 0x04038649
-[UIPageViewController _setViewControllers:withCurlOfType:fromLocation:direction:animated:notifyDelegate:completion:]
+ 2250
17 UIKit 0x0403a76a
-[UIPageViewController setViewControllers:direction:animated:completion:] + 309
18 ??? 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 ??? 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

Actually, I don't think you should use UIPageViewController to implement the sign up progress.
But if you just need it, there is a sample I wrote for other, you can check this link to get it:
xamarin.ios implement PageController with images only code
I suggest you to use UINavigationController, It can make all you need, there is an example:
This is the code for AppDelegate(override the method "FinishedLaunching"):
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;
}
This is the code for SignUpStepViewController:
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);
}
}
Hope it can help you.
If you still need help, just leave the message here, I will check latter.