在IOS上使用mvvmcross绑定的问题（在模拟器上工作，但某些属性在设备上不起作用）

问题在于绑定到UIBarButtonItem，代码在Simulator上工作，但在设备上属性Enable不起作用，Clicked Works …

textViewItem中存在同样的问题，但这次text或enable都不起作用。

public partial class ProcessDetailViewController : MvxBindingTouchViewController { public ProcessDetailViewController (MvxShowViewModelRequest request) : base (request,"ProcessDetailViewController", null) { } public override void DidReceiveMemoryWarning () { // Releases the view if it doesn't have a superview. base.DidReceiveMemoryWarning (); // Release any cached data, images, etc that aren't in use. } public override void ViewDidLoad () { base.ViewDidLoad (); this.AddBindings( new Dictionary() { { this.lblSeguradoraNome , "{'Text':{'Path':'AssuranceCompanyID'}}" }, { this.lblSeguradoraGestor , "{'Text':{'Path':'AssuranceManager'}}" }, { this.lblApoliceData , "{'Text':{'Path':'InsurancePolicyStartDate'}}" }, { this.lblApoliceNum , "{'Text':{'Path':'InsurancePolicyNumber'}}" }, { this.lblApoliceRamo , "{'Text':{'Path':'InsurancePolicyBranch'}}" }, { this.lblDataPedido , "{'Text':{'Path':'RequestDate'}}" }, { this.lblGestor , "{'Text':{'Path':'InternalManager'}}" }, { this.lblLocalRiscoCodPostal , "{'Text':{'Path':'InsurancedLocationAddressCityZipCode'}}" }, { this.lblLocalRiscoConcelho , "{'Text':{'Path':'InsurancedLocationAddressCity'}}" }, { this.lblLocalRiscoMorada , "{'Text':{'Path':'InsurancedLocationAddress'}}" }, { this.lblPerito , "{'Text':{'Path':'Surveyer'}}" }, { this.lblSeguradoCodPostal , "{'Text':{'Path':'InsuredPersonAddressCityZipCode'}}" }, { this.lblSeguradoConcelho , "{'Text':{'Path':'InsuredPersonAddressCity'}}" }, { this.lblSeguradoContacto , "{'Text':{'Path':'InsuredPersonPhone'}}" }, { this.lblSeguradoMorada , "{'Text':{'Path':'InsuredPersonAddress'}}" }, { this.lblSeguradoNome , "{'Text':{'Path':'InsuredPersonName'}}" }, { this.btnDownload , "{'Clicked':{'Path':'DownloadProcessButton'},'Enabled':{'Path':'HideIfDownloaded'}}" }, { this.btnTerminarVisita , "{'Clicked':{'Path':'EndVisitButton'},'Enabled':{'Path':'ShowIfOnVisit'}}" }, { this.btnObterLocalizacao , "{'Clicked':{'Path':'AdquireLocationButton'},'Enabled':{'Path':'ShowIfOnVisit'}}" }, { this.btnIniciarVisita , "{'Clicked':{'Path':'BeginVisitButton'},'Enabled':{'Path':'HideIfOnVisit'}}" }, { this.btnTirarFoto , "{'Clicked':{'Path':'TakePhotoButton'},'Enabled':{'Path':'ShowIfOnVisit'}}" }, { this.btnVoltar , "{'Clicked':{'Path':'ReturnButton'}}" }, { this.btnUpload , "{'Clicked':{'Path':'UploadProcessButton'},'Enabled':{'Path':'CanUpload'}}" }, } ); // var a= NavigationItem.LeftBarButtonItems[0].Enabled // Perform any additional setup after loading the view, typically from a nib. } public override void ViewDidUnload () { base.ViewDidUnload (); // Clear any references to subviews of the main view in order to // allow the Garbage Collector to collect them sooner. // // eg myOutlet.Dispose (); myOutlet = null; ReleaseDesignerOutlets (); } public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation) { // Return true for supported orientations return true; } } 

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  public class ProcessDetailViewModel : ProcessNavigationBaseViewModel {(...)} 

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 public class ProcessNavigationBaseViewModel : BaseViewModel { (...) #region Properties private Process _currentProcess; private static User _user; private bool _isGPSLocationStarted; private double _latitude; private double _longitude; private string _photoFilename = ""; public Process CurrentProcess { get { return _currentProcess; } set { _currentProcess = value; FirePropertyChanged(() => CurrentProcess); } } public User User { get { return _user; } set { _user = value; FirePropertyChanged(() => User); } } private bool _isDownloaded { get { return CurrentProcess.IsLockedInServer && !(CurrentProcess.ProcessState == ProcessState.WaitingReportProduction.ToString()); } set { CurrentProcess.IsLockedInServer = value; FirePropertyChanged(() => ShowIfDownloaded); FirePropertyChanged(() => HideIfDownloaded); } } public bool ShowIfDownloaded { get { return _isDownloaded; } } public bool HideIfDownloaded { get { return !_isDownloaded; } } public bool CanUpload { get { return ( CurrentProcess.ProcessState == ProcessState.WaitingUpload.ToString()); } } public bool CanDownload { get { return (CurrentProcess.ProcessState != ProcessState.WaitingReportProduction.ToString() && CurrentProcess.ProcessState == ProcessState.WaitingSurveyorAcceptionDecision.ToString()) ; } } public bool ShowIfOnVisit { get { return (CurrentProcess.ProcessState == ProcessState.OnVisist.ToString()); } } public bool HideIfOnVisit { get { return (!(CurrentProcess.ProcessState == ProcessState.OnVisist.ToString())) && ShowIfDownloaded; } } public string ProcessDescription { get { return string.Format("{0} - {1}", CurrentProcess.ProcessNumber, CurrentProcess.RequestedService.RequestedServiceType); } } (...) } 

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提前致谢

[编辑]

应用程序输出：2013-01-11 09：16：56.369 LinkFENACAMSIGEPMobileUIIPad [6496：c07]导航：诊断：2.24使用args导航到MainMenuViewModel

2013-01-11 09：16：56.369 LinkFENACAMSIGEPMobileUIIPad [6496：c07] TouchNavigation：Diagnostic：2.24 Navigate required

2013-01-11 09：16：56.421 LinkFENACAMSIGEPMobileUIIPad [6496：c07] MvxBind：警告：2.29无法绑定到源是null

2013-01-11 09：16：56.423 LinkFENACAMSIGEPMobileUIIPad [6496：c07] MvxBind：警告：2.29无法绑定到源是null

[编辑20130111：11：12] – 链接器行为：仅链接SDK程序集

类似于： MvvmCross Monotouch – 无法在真正的iPad上绑定属性，但它可以在模拟器上运行 （我无法使其工作……）

Answer 1

我看不到示例代码中的barbutton – 所以我会根据Text，Clicked，Enabled等来回答。

如果这在Simulator中有效，但在设备上没有，则可能与链接器有关 – 就像在MvvmCross Monotouch中一样 – 无法在真正的iPad上绑定属性，但它可以在模拟器上运行

要测试此理论，请尝试将链接器转为包含所有符号

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假设这是问题的原因…然后要解决它，你需要包含一个LinkerPleaseInclude.cs文件，它会欺骗链接器包含这些属性。

例如，它可能看起来像：

 public class LinkerIncludePlease { private void IncludeClicked(UIButton button) { button.Clicked += (s, e) => { }; } private void IncludeEnabled(UIButton button) { button.Enabled = !button.Enabled; } private void IncludeText(UILabel label) { label.Text = label.Text + "test"; } } 

注意：此代码从未实际执行过，但在构建时由链接器进行分析。