MVVMCROSS Ios绑定ShowViewModel [英] MVVMCROSS Ios Binding ShowViewModel
问题描述
在模型中通过调用showviewmodel-method进行导航后，在mvvmcross中存在数据绑定问题.在Android方面，它可以正常工作.
问题是导航本身正在工作，但是我没有从模型中获取任何数据.
模型中的导航:
ShowViewModel<TeamEventDetailsViewModel>(new { eventID = item.ID });
包含数据的ViewModel:
public class TeamEventDetailsViewModel
: EventDetailsViewModel
{
public TeamEventModel CurrentEvent
{
get { return MyCurrentEvent as TeamEventModel; }
set
{
MyCurrentEvent = value;
RaisePropertyChanged(() => CurrentEvent);
TickerModel.Comments = value.Comments;
RaisePropertyChanged(() => TickerModel);
LineupModel.Team1Players = value.Team1Players;
LineupModel.Team2Players = value.Team2Players;
RaisePropertyChanged(() => LineupModel);
}
}
private EventDetailsLineupViewModel _lineupModel = new EventDetailsLineupViewModel();
public EventDetailsLineupViewModel LineupModel
{
get { return _lineupModel; }
set { _lineupModel = value; RaisePropertyChanged(() => LineupModel); }
}
public TeamEventDetailsViewModel()
{
EventToken = MvxMessenger.Subscribe<EventUpdateMessage>(OnEventUpdateMessage);
}
private void OnEventUpdateMessage(EventUpdateMessage eventUpdate)
{
if (MyCurrentEvent != null && eventUpdate.Event.ID == MyCurrentEvent.ID)
{
var updatedEvent = (TeamEventModel)eventUpdate.Event;
var myEvent = CurrentEvent;
if(updatedEvent.Score!=null)
myEvent.Score = updatedEvent.Score;
if (updatedEvent.Team1Players != null)
myEvent.Team1Players = updatedEvent.Team1Players;
if (updatedEvent.Team2Players != null)
myEvent.Team2Players = updatedEvent.Team2Players;
CurrentEvent = myEvent;
}
}
protected override void Update(EventModel eventdetails)
{
CurrentEvent = (TeamEventModel) eventdetails;
}
private string _teststring = "success";
public string Teststring
{
get { return _teststring; }
set
{
_teststring = value;
RaisePropertyChanged(()=>_teststring);
}
}
}
正如您在底部看到的那样，我实现了一个测试字符串以证明其功能.
在视图中绑定:
public class TeamEventDetailsView : MvxViewController
{
public UILabel TestLabel = new UILabel();
public TeamEventDetailsViewModel TeamEventDetailsViewModel
{
get { return (TeamEventDetailsViewModel)base.ViewModel; }
set { base.ViewModel = value; }
}
public override void ViewDidLoad()
{
View.AddSubview(TestLabel);
this.CreateBinding(TestLabel).To<TeamEventDetailsViewModel>(vm => vm.Teststring).Apply();
TestLabel.BackgroundColor = UIColor.Orange;
}
public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
TestLabel.Frame=new RectangleF(0,20,View.Frame.Width,80);
}
}
因此，我重复一遍，导航本身可以工作，但是模型中的数据没有显示在视图上.
如果我在View中手动创建ViewModel，那么绑定也可以工作，但是在我的情况下，我无法做到这一点，因为数据是根据ViewModel生成的数据(调用导航过程)提取的. >
手动ViewModel:
TeamEventDetailsViewModel = new TeamEventDetailsViewModel();
TeamEventDetailsViewModel.Init(9816);
正如我所知，我所做的与Stuard在其教程中所做的完全相同:
https://www.youtube.com/watch?v=cbdPDZmuHk8
有人对我有建议吗? 谢谢.
MvvmCross在base.ViewDidLoad()中创建ViewModel-如果将该调用添加到您的ViewDidLoad覆盖中，则一切正常
I've got problem with data-binding in mvvmcross after doing the navigation in the model by calling the showviewmodel-method. On the android side it works.
So the Problem is, that the navigation itself is working but I don't get any data from the model.
Navigation in the model:
ShowViewModel<TeamEventDetailsViewModel>(new { eventID = item.ID });
ViewModel which containts the Data:
public class TeamEventDetailsViewModel
: EventDetailsViewModel
{
public TeamEventModel CurrentEvent
{
get { return MyCurrentEvent as TeamEventModel; }
set
{
MyCurrentEvent = value;
RaisePropertyChanged(() => CurrentEvent);
TickerModel.Comments = value.Comments;
RaisePropertyChanged(() => TickerModel);
LineupModel.Team1Players = value.Team1Players;
LineupModel.Team2Players = value.Team2Players;
RaisePropertyChanged(() => LineupModel);
}
}
private EventDetailsLineupViewModel _lineupModel = new EventDetailsLineupViewModel();
public EventDetailsLineupViewModel LineupModel
{
get { return _lineupModel; }
set { _lineupModel = value; RaisePropertyChanged(() => LineupModel); }
}
public TeamEventDetailsViewModel()
{
EventToken = MvxMessenger.Subscribe<EventUpdateMessage>(OnEventUpdateMessage);
}
private void OnEventUpdateMessage(EventUpdateMessage eventUpdate)
{
if (MyCurrentEvent != null && eventUpdate.Event.ID == MyCurrentEvent.ID)
{
var updatedEvent = (TeamEventModel)eventUpdate.Event;
var myEvent = CurrentEvent;
if(updatedEvent.Score!=null)
myEvent.Score = updatedEvent.Score;
if (updatedEvent.Team1Players != null)
myEvent.Team1Players = updatedEvent.Team1Players;
if (updatedEvent.Team2Players != null)
myEvent.Team2Players = updatedEvent.Team2Players;
CurrentEvent = myEvent;
}
}
protected override void Update(EventModel eventdetails)
{
CurrentEvent = (TeamEventModel) eventdetails;
}
private string _teststring = "success";
public string Teststring
{
get { return _teststring; }
set
{
_teststring = value;
RaisePropertyChanged(()=>_teststring);
}
}
}
As you can see at the bottom I implemented a teststring to prove functionality.
Binding in the View:
public class TeamEventDetailsView : MvxViewController
{
public UILabel TestLabel = new UILabel();
public TeamEventDetailsViewModel TeamEventDetailsViewModel
{
get { return (TeamEventDetailsViewModel)base.ViewModel; }
set { base.ViewModel = value; }
}
public override void ViewDidLoad()
{
View.AddSubview(TestLabel);
this.CreateBinding(TestLabel).To<TeamEventDetailsViewModel>(vm => vm.Teststring).Apply();
TestLabel.BackgroundColor = UIColor.Orange;
}
public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
TestLabel.Frame=new RectangleF(0,20,View.Frame.Width,80);
}
}
So I repeat, the navigation itself works but the data from model doesn't get shown on the view.
If I create the ViewModel manually in the View then the binding works also, but in my Situation I can't do that because the Data is pulled depending on the generated Data from the ViewModel which calls the navigation-proceed.
Manual ViewModel:
TeamEventDetailsViewModel = new TeamEventDetailsViewModel();
TeamEventDetailsViewModel.Init(9816);
As I can tell I did exactly the same as Stuard does in his Tutorial:
https://www.youtube.com/watch?v=cbdPDZmuHk8
Does anyone has an advice for me? Thanks.
MvvmCross does the ViewModel create in base.ViewDidLoad() - if you add that call to your ViewDidLoad override then everything should work ok
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