在Alamofire 4.0中无法使用类型为（（String，withName：String））的参数列表调用'append' [英] Cannot invoke 'append' with an argument list of type '(String, withName: String)' in Alamofire 4.0
问题描述
我正在使用Alamofire 4.0通过设备/相机选择或录制视频后将视频上传到服务器，但是当我尝试使用append调用上传功能时，在所有append语句中都出现了此错误，这是怎么回事
I'm using Alamofire 4.0 to upload video to server after select or record it through device/camera but when I'm trying to call upload function with append , this error appeared to me in all append statement , what is the wrong in my code.
第二个问题是我是否要在上传过程中显示进度和进度百分比，如何通过Alamofire做到这一点。
the second my question about if I want to display progress with percentage of progress during upload how I can make that through Alamofire.
谢谢：）
阅读选定/录制的视频的网址后我的代码
My code after reading url of selected/recorded video
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let mediaType:AnyObject? = info[UIImagePickerControllerMediaType] as AnyObject?
if let type:AnyObject = mediaType {
if type is String {
let stringType = type as! String
if stringType == kUTTypeMovie as String {
let urlOfVideo = info[UIImagePickerControllerMediaURL] as? NSURL
if let url = urlOfVideo {
// 2
print(url)
let URL = try! URLRequest(url: "myurl", method: .post, headers: ["Authorization": "auth_token"])
Alamofire.upload(multipartFormData: { multipartFormData in
multipartFormData.append(url, withName: "videoFile", fileName: "filename", mimeType: "mov")
multipartFormData.append("video", withName: "load")
multipartFormData.append("record", withName: "type")
}, with: URL, encodingCompletion: { (result) in
// code
})
}
}
}
}
picker.dismiss(animated: true, completion: nil)
}
推荐答案
关于错误消息：
无法使用类型为'
（String的参数列表）调用''追加' ，withName：String）
Cannot invoke '
append' with an argument list of type '(String, withName: String)'
如果我们看一下 MultipartFormData的的Alamofire： append 方法
If we take a look at the append methods of MultipartFormData of Alamofire:
- Alamofire/Source/MultipartFormData.swift
我们注意到，没有 append（...）方法允许类型为 String 的第一个参数，这就是您的意思，但是，尝试在 Alamofire.upload 的 multipartFormData 闭包中追加时使用。
We note that no append(...) method allows a first argument of type String, which is what you, however, attempt to use when appending in your multipartFormData closure of Alamofire.upload.
multipartFormData.append("video", withName: "load")
multipartFormData.append("record", withName: "type")
我相信您正在尝试使用下列方法：
I believe you're attempting to use the following method:
public func append(_ data: Data, withName name: String) { ... }
在这种情况下，您需要将字符串编码为Swift类型的 Data ，例如如下：
In which case you need to encode your string into the Swift type Data, e.g. as follows:
multipartFormData.append("video".data(using: .utf8)!, withName: "load")
multipartFormData.append("record".data(using: .utf8)!, withName: "type")
至于您的通话：
As for your call:
multipartFormData.append(url, withName: "videoFile", fileName: "filename", mimeType: "mov")
上面不变的 url 的类型为 NSURL 。在Swift 3中，您应该更喜欢使用基金会类型 URL ，该类型桥接到 NSURL ，但类型不同。我们在Alamofire 4中看到，它特别希望您尝试在上面调用的 append 函数的 URL 类型：
The immutable url above is of of type NSURL. In Swift 3, you should prefer using Foundation type URL instead, which bridge to NSURL, but is not the same type. We see in Alamofire 4 that it particularly expects the URL type for the append function you attempt to call above:
public func append(_ fileURL: URL, withName name: String, fileName: String, mimeType: String)
您已经注意到自己可能会使用一种解决方法通过对实例 url NSURL 的 absoluteURL 属性调用此方法$ c>;但这只是产生了 URL 类型的可选内容。更好的方法是从一开始就使用 URL 类型，而不是 NSURL 。
You've noted yourself that you may use a workaround to call this method by using the absoluteURL property of NSURL upon your instance url; but this simply yields an optional of type URL. A better approach would simply be using the URL type rather than NSURL from the start.
这篇关于在Alamofire 4.0中无法使用类型为（（String，withName：String））的参数列表调用'append'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
