一、从其他App获取文件：

让自己的App显示在系统的分享列表里：需要修改 *.plist 文件
Key为：CFBundleDocumentTypes
Value是：数组，可以包含n个字典，一般一个字典表示支持一种类型的文件

CFBundleTypeName // 文件类型名称（自己起个名）
LSHandlerRank // 包含Owner，Default，Alternate，None四个可选值
LSItemContentTypes // 数组类型，包含支持的文件类型

<key>CFBundleDocumentTypes</key>
<array>
    <dict>
        <key>CFBundleTypeName</key>
        <string>TextExtraction</string>
        <key>LSHandlerRank</key>
        <string>Default</string>
        <key>LSItemContentTypes</key>
        <array>
            <string>com.microsoft.word.doc</string>
            <string>public.content</string>
            <string>public.composite-content</string>
            <string>public.text</string>
        </array>
    </dict>
</array>

Supports opening documents in place   
YES

image.png

二、SceneDelegate

func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
    
    guard TEShare.isLoginUserAndPresent == true else { return }
    
    guard let context = URLContexts.first else { return }
    tsPrint(context.url)
    
    let urlString = context.url.absoluteString
    
    if urlString.hasPrefix("file://") {
        
        
        if urlString.hasSuffix("docx") || urlString.hasSuffix("doc") || urlString.hasSuffix("txt") || urlString.hasSuffix("mp3") || urlString.hasSuffix("m4a") || urlString.hasSuffix("pdf") {
            
            let fileName = urlString.lastPathComponent
            let path = urlString.urlDecoded
            let aaPath = path.removingPrefix("file://")
            let dict = ["fileName" : fileName, "filePath" : aaPath]
            
            DispatchQueue.main.asyncAfter(deadline: .now() + 1, execute:{
                ///延迟执行的代码
                NotificationCenter.default.post(name: .ReceiveFile, object: nil, userInfo: dict)
           })
            
        } else {
            HUD.showError("该文件格式无法识别")
        }
    }
}

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    
    guard let _ = (scene as? UIWindowScene) else { return }
    let url = connectionOptions.urlContexts.first?.url
    tsPrint(url)
    
    guard let urlString = url?.absoluteString else { return }
    
    if urlString.hasPrefix("file://") {
        
        guard TEShare.isLoginUserAndPresent == true else { return }
        
        if urlString.hasSuffix("docx") || urlString.hasSuffix("doc") || urlString.hasSuffix("txt") || urlString.hasSuffix("mp3") || urlString.hasSuffix("m4a") || urlString.hasSuffix("pdf") {
            
            let fileName = urlString.lastPathComponent
            let path = urlString.urlDecoded
            let aaPath = path.removingPrefix("file://")
            let dict = ["fileName" : fileName, "filePath" : aaPath]
            
            DispatchQueue.main.asyncAfter(deadline: .now() + 1, execute:{
                ///延迟执行的代码
                NotificationCenter.default.post(name: .ReceiveFile, object: nil, userInfo: dict)
           })
            
        } else {
            HUD.showError("该文件格式无法识别")
        }
    }
    
}

参考文章：https://blog.csdn.net/Margaret_MO/article/details/106410905