Xamarin.iOS中使用MvvmLight框架

如何在Xamarin.iOS 中使用MvvmLight框架：

1. 通过NuGet包管理器安装MvvmLight包

2. 创建对应的ViewModel

3. 在Controller中使用ViewModel（需要在Controller中添加引用：using GalaSoft.MvvmLight.Helpers 才能使用binding技术）

 

UpdateTargetTrigger方法已经不被推荐使用，推荐使用ObserveTargetEvent。

ViewModel：

public class TextViewModel : ViewModelBase{    private string text;     public string Text    {        get { return text; }        set { 　　　　　　　　if (value != _text)              {
                    _text= value;                  RaisePropertyChanged("Text");              } 　　　　　　}    }}

UIViewController:

需要在Controller中添加引用：

using GalaSoft.MvvmLight.Helpers;

public class TextViewController : UIViewController    {        private TextViewModel textViewModel;         private Binding
     
       textFieldBinding;        private UITextField textField;         private UITextField TextField        {            get { return textField; }        }         private TextViewModel TextViewModel        {            get { return textViewModel; }        }         public override void ViewDidLoad()        {            base.ViewDidLoad();            textViewModel = new TextViewModel();             textField = new UITextField(new CoreGraphics.CGRect(20, 75, 280, 40));            textField.BackgroundColor = UIColor.White;             textFieldBinding = this.SetBinding(                () => TextViewModel.Text,                () => TextField.Text,                BindingMode.TwoWay)                .ObserveTargetEvent(nameof(UITextField.EditingChanged));             View.AddSubview(textField);        }    }
     

 

 UISlider:

this.SetBinding(() => mDetailViewModel.PasswordLength, () => SliderCount.Value, BindingMode.TwoWay).ObserveTargetEvent(nameof(UISlider.ValueChanged));

BEMCheckBox:

this.SetBinding(() => mDetailViewModel.CheckLower, () => CheckBoxContainer.CheckBoxLower.On, BindingMode.TwoWay).ObserveTargetEvent(nameof(BEMCheckBox.AnimationDidStopForCheckBox));