Xamarin iOS :过滤掉文档选取器上的FileType显示

Question

我试图过滤掉所有的文件，其中不是图像，视频，音频，pdf和其他文档文件，如微软。

目前，我的代码中包含以下内容：

var allowedUTIs = new string[] {
            UTType.Image,
            UTType.PDF,
            UTType.Video,
            UTType.Audio,
            UTType.Movie,
            UTTYPE.Text,
            "com.microsoft.word.doc",
            "com.microsoft.excel.xls",
            "com.microsoft.powerpoint.ppt",
            "org.openxmlformats.wordprocessingml.document"
        };

主要关注的是自定义的类型。它是否涵盖了所有microsoft offices文件类型: doc、xls、ppt、docx等。

是否还有其他我没有介绍的文档类型，例如苹果的特定文档文件。

Answer 1

        var allowedUtis = new string[] {
            UTType.UTF8PlainText,
            UTType.PlainText,
            UTType.RTF,
            UTType.PNG,
            UTType.Text,
            UTType.PDF,
            UTType.Image,
            UTType.UTF16PlainText,
            UTType.FileURL,
            "com.microsoft.word.doc",
            "org.openxmlformats.wordprocessingml.document",
            "com.microsoft.powerpoint.​ppt"
            "org.openxmlformats.spreadsheetml.sheet",
            "org.openxmlformats.presentationml.presentation",
            "com.microsoft.excel.xls"
        };

这些是我的UTTypes

在这里，对于文档"com.microsoft.word.doc"，对于文档"org.openxmlformats.wordprocessingml.document“等等。我已经对所有的文档进行了测试。

Answer 2

或者您可以像这样使用

       var fileTypes = new string[] {
        "public.utf8-plain-text", 
        "public.plain-text", 
        "public.text",
        "public.png", 
        "public.jpeg", 
        "com.microsoft.bmp",           
        "public.composite-content" 
        "com.adobe.pdf",
        "public.image", 
        "public.file-url", 
        "com.microsoft.word.doc",
        "org.openxmlformats.wordprocessingml.document",
        "com.microsoft.powerpoint.​ppt",
        "org.openxmlformats.spreadsheetml.sheet",
        "org.openxmlformats.presentationml.presentation",
        "com.microsoft.excel.xls"
         };

https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html

编辑

使用Xamarin essentials

    var customFileType = new FilePickerFileType(new Dictionary<DevicePlatform, IEnumerable<string>>
   {
     {              
      DevicePlatform.Android, fileTypes
     },
     {
        DevicePlatform.iOS, fileTypes
     }
   });
       

 var file = await FilePicker.PickAsync(new PickOptions
 {
    PickerTitle = "Please select a file",
    FileTypes = customFileType,
 });

Answer 3

允许视频，和音频文件也有一个选项，如果不添加，它会显示文件，但禁用你不能挑选。

var allowedUTIs = new string[]
{
    UTType.UTF8PlainText,
    UTType.PlainText,
    UTType.RTF,
    UTType.PNG,
    UTType.Text,
    UTType.PDF,
    UTType.Image,
    UTType.UTF16PlainText,
    UTType.FileURL,
    UTType.Spreadsheet,
    UTType.MP3,
    UTType.MPEG4,
    UTType.MPEG4Audio,
    UTType.WaveformAudio,
    UTType.Audio,
    UTType.Video,
    UTType.GIF,
    UTType.BMP,
    "org.openxmlformats.wordprocessingml.document",
    "com.microsoft.powerpoint.​ppt",
    "org.openxmlformats.spreadsheetml.sheet",
    "org.openxmlformats.presentationml.presentation",
    "com.microsoft.excel.xls",
    "com.microsoft.waveform-​audio",
    "com.microsoft.windows-​media-wmv",
    "com.adobe.illustrator.ai-​image"
};

苹果文档：https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/UTIRef/Articles/System-DeclaredUniformTypeIdentifiers.html