swift3 – 设置Alamofire自定义目标文件名,而不是在Swift 3.0中

发布时间：2020-12-14 05:43:54 所属栏目：百科来源：网络整理

导读：如何在swift 3.0中编写以下代码段？以下语法在swift 2中 Alamofire.download(.POST,invoice.url,parameters:params,destination: { (url,response) - NSURL in let pathComponent = response.suggestedFilename let fileManager = NSFileManager.defaultMana

如何在swift 3.0中编写以下代码段？以下语法在swift 2中

Alamofire.download(.POST,invoice.url,parameters:params,destination: { (url,response) -> NSURL in

        let pathComponent = response.suggestedFilename

        let fileManager = NSFileManager.defaultManager()
        let directoryURL = fileManager.URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask)[0]
        let fileUrl = directoryURL.URLByAppendingPathComponent(pathComponent)
        return fileUrl
    })
    .progress { bytesRead,totalBytesRead,totalBytesExpectedToRead in
        print(totalBytesRead)
        dispatch_async(dispatch_get_main_queue()) {
            let progress = Double(totalBytesRead) / Double(totalBytesExpectedToRead)
            completionHandler(progress,nil)
        }
    }
    .responseString { response in
        print(response.result.error)
        completionHandler(nil,response.result.error)
    }

在Swift 3中它就是这样的.

let parameters: Parameters = ["foo": "bar"]

let destination: DownloadRequest.DownloadFileDestination = { _,_ in
    let pathComponent = "yourfileName"
    let documentsURL = FileManager.default.urls(for: .documentDirectory,in: .userDomainMask)[0]
    let fileURL = documentsURL.appendPathComponent(pathComponent)
    return (fileURL,[.removePreviousFile,.createIntermediateDirectories])
}

Alamofire.download(urlString,method: .get,parameters: parameters,encoding: JSONEncoding.default,to: destination)
    .downloadProgress(queue: DispatchQueue.global(qos: .utility)) { progress in
        print("Progress: (progress.fractionCompleted)")
    }
    .validate { request,response,temporaryURL,destinationURL in
        // Custom evaluation closure now includes file URLs (allows you to parse out error messages if necessary)
        return .success
    }
    .responseJSON { response in
        debugPrint(response)
        print(response.temporaryURL)
        print(response.destinationURL)
    }

有关详细信息,请查看Alamofire Documentation或Alamofire 4.0 Migration Guide.

（编辑：李大同）

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