从 ViewModel class 调用 FFImageLoading 的 GetImageAsPngAsync？

Question

将 https://github.com/luberda-molinet/FFImageLoading 用于 Xamarin Forms

我的XAML:

 <forms:CachedImage
CacheType="All"
RetryDelay="1000"
DownsampleHeight="150"
RetryCount="5"
CacheDuration="1"
BackgroundColor="WhiteSmoke"
BitmapOptimizations="True"
SuccessCommand="{Binding CcCommand}"
Source = "{Binding Photo1}">

我的 ViewModel Class:

class AboutMeViewModel : INotifyPropertyChanged
{
    public ICommand CcCommand { get; set; }

    public AboutMeViewModel()
    {
        CcCommand = new Command<CachedImageEvents.SuccessEventArgs>(ffFinishLoading);
    }

    void ffFinishLoading(CachedImageEvents.SuccessEventArgs ea)
    {
       // Here I would like to call 'GetImageAsPngAsync'
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

在 ffFinishLoading 中，我想调用 GetImageAsPngAsync，但我无法在 ViewModel class 中找到执行此操作的方法，因为我无法从 XAML 中选择参考 forms:CachedImage文件到 ViewModel 文件。

任何帮助将不胜感激。

Answer 1

var stream = await ImageService.Instance.LoadUrl(Photo1).AsPNGStreamAsync();

从 ViewModel class 调用 FFImageLoading 的 GetImageAsPngAsync？

Calling GetImageAsPngAsync of FFImageLoading from ViewModel class?

xamarin.forms

ffimageloading