下载的PDF文件小且无法打开 - Swift iOS答案

【问题标题】：PDF file downloaded with small size and can't be opened - Swift iOS下载的PDF文件小且无法打开 - Swift iOS
【发布时间】：2021-12-30 12:05:50
【问题描述】：

我正在尝试使用来自 API 的链接下载 pdf 文件，但它总是以 5 KB 的大小下载，并且文件总是损坏且无法打开，该链接工作正常，因为我已经尝试过了，我的代码：

import Foundation
import Alamofire


class DownloadOrderService {
    
    static let shared = DownloadOrderService()

func downloadPDFOrder(orderID: Int, completion: @escaping(_ error: Error?)-> Void) {
    let urlString = getJSON(strURL:"URL")
    
    let destination: DownloadRequest.Destination = { _, _ in
        let documentsURL:NSURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! as NSURL
        debugPrint("***documentURL: ",documentsURL)
        let fileURL = documentsURL.appendingPathComponent("\(orderID).pdf")
        debugPrint("***fileURL: ",fileURL ?? "")
        return (fileURL!,[.removePreviousFile, .createIntermediateDirectories])
    }
    
    AF.download(urlString,method: .get, encoding: JSONEncoding.default, to: destination).downloadProgress(closure: { (prog) in
        
    }).response { response in
        if response.error == nil {
            
            debugPrint(response)
            

            completion(nil)
            
        }
        else {
            completion(response.error)
        }
    }
    
}
    
}

我在代码结果和响应中的所有打印语句：

       "***documentURL: " file:///Users/mac/Library/Developer/CoreSimulator/Devices/71CB6514-5C19-423C-989C-B21F2CEFE65E/data/Containers/Data/Application/3F21E22E-469E-4BCD-8079-83BC4CE321F2/Documents/
    "***fileURL: " file:///Users/mac/Library/Developer/CoreSimulator/Devices/71CB6514-5C19-423C-989C-B21F2CEFE65E/data/Containers/Data/Application/3F21E22E-469E-4BCD-8079-83BC4CE321F2/Documents/1007.pdf
    [Request]: GET url
        [Headers]: None
    [Body]: None
[Response]:
    [Status Code]: 200
    [Headers]:
        access-control-allow-headers: *
        access-control-allow-methods: *
        Access-Control-Allow-Origin: *
        Cache-Control: no-cache, private
        Content-Encoding: br
        Content-Length: 1344
        content-security-policy: upgrade-insecure-requests
        Content-Type: text/html; charset=UTF-8
        Date: Fri, 19 Nov 2021 20:25:54 GMT
        Server: LiteSpeed
        Set-Cookie: laravel_session=eyJpdiI6IjhPMFBvR2l6U2dwYk83OVIreWRqSUE9PSIsInZhbHVlIjoidU5yeEttN1BlQlRyXC9YVkh2d1RUYjJib3J1WkNtUUhVXC9oSVBzS08ybkhBYU9DT0tGaCtRbElBZzJiN2VRRFFvIiwibWFjIjoiYWQ2Y2UwZjhjZGI1MGUyYzg5MDNmOTA2YTVmNDI3MDZhM2JmZWM1NDFlOTRlZDY2NGFkNjk0MGQ5NTJjYTRjZSJ9; expires=Fri, 19-Nov-2021 22:25:54 GMT; Max-Age=7200; path=/; httponly; secure
        Vary: Accept-Encoding
        x-powered-by: PHP/7.4.11
[File URL]: /Users/mac/Library/Developer/CoreSimulator/Devices/71CB6514-5C19-423C-989C-B21F2CEFE65E/data/Containers/Data/Application/492B9611-A6BD-4456-BE3B-9E2419E11073/Documents/1007.pdf
[Resume Data]: None
[Network Duration]: 0.38273394107818604s
[Serialization Duration]: 0.0s
[Result]: success(Optional(file:///Users/mac/Library/Developer/CoreSimulator/Devices/71CB6514-5C19-423C-989C-B21F2CEFE65E/data/Containers/Data/Application/492B9611-A6BD-4456-BE3B-9E2419E11073/Documents/1007.pdf))

更新：我什至创建了另一个函数，它再次导致我遇到同样的问题：

func savePdf(orderID: Int) {
    let urlString = getJSON(strURL:"url")

       DispatchQueue.main.async {
           let pdfData = try? Data.init(contentsOf: urlString)
           let resourceDocPath = (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)).last! as URL
           let pdfNameFromUrl = "Orderatak-\(orderID).pdf"
           let actualPath = resourceDocPath.appendingPathComponent(pdfNameFromUrl)
           do {
               try pdfData?.write(to: actualPath, options: .atomic)
           }
            
           catch {
               debugPrint(error.localizedDescription)
           }
       }
   }

【问题讨论】：

我在浏览器中试了链接，下载成功，大小为3MB
您现在可以检查问题的编辑，我已经包含了所有打印语句和响应
5k根本打不开

标签： ios swift pdf alamofire downloadfile

【解决方案1】：

经过一些挖掘和尝试不同的链接后，我发现不幸的是，在与后端开发人员核实后，问题出在 URL 上，上面的两个代码都工作正常，您可以使用自己的复制和粘贴它们URL，不要忘记将以下属性添加到您的info.plist 并将它们设置为 YES 以便在您在真实设备中运行应用程序时能够找到下载的文件：

支持原地打开文档
应用程序支持 iTunes 文件共享

【讨论】：