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对 Xamarin 表单使用https://github.com/luberda-molinet/FFImageLoading

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}">

我的视图模型类：

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 我想调用 GetImageAsPngAsync 但我找不到在 ViewModel 类中执行此操作的方法，因为我没有参考表单的选项：CachedImage 从 XAML 文件到 ViewModel 文件。

任何帮助都感激不尽。

4

1 回答 1

2 
var stream = await ImageService.Instance.LoadUrl(Photo1).AsPNGStreamAsync();
于 2017-12-19T12:45:51.517 回答