使用URLSession.shared.uploadTask上传图片和参数到接口
使用URLSession.shared.uploadTask上传图片和参数到接口
提问于 2019-04-26 08:34:54
我正在尝试解决如何使用swift将一组参数和一个图像文件上传到我的API。
我的代码大致是这样的：
//parameters
let actualParameters = ["email": myEmail, "token": myToken, "certnbr": certnbr, "title": title, "newCert": newCert, "expires": expires, "expiryDate": expiryDate, "issueDate": issueDate] as! [String : Any]
let parameters = NewCertModel(email: "email")
//create the url with URL
let url = URL(string: "http://127.0.0.1:8000/api/newCertification/")!
//now create the URLRequest object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST"
let boundary = "Boundary-\(UUID().uuidString)"
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
request.httpBody = createBody(parameters: params,
boundary: boundary,
data: UIImageJPEGRepresentation(chosenImage, 0.7)!,
mimeType: "image/jpg",
filename: "hello.jpg")
guard let uploadData = try? JSONEncoder().encode(parameters) else {
print("Error Upload Data")
return
}
//new session
URLSession.shared.uploadTask(with: request as URLRequest, from: jsonData as! Data) { (responseData, response, error) in
// Check on some response headers (if it's HTTP)
if let httpResponse = response as? HTTPURLResponse {
switch httpResponse.statusCode {
case 200..<300:
print("Success")
case 400..<500:
print("Request error")
case 500..<600:
print("Server error")
case let otherCode:
print("Other code: \(otherCode)")
}
}
// Do something with the response data
if let
responseData = responseData,
let responseString = String(data: responseData, encoding: String.Encoding.utf8) {
print("Server Response:")
print(responseString)
}
// Do something with the error
if let error = error {
print(error.localizedDescription)
}
}
.resume()
}
}代码并不完美，因为我尝试了相当多的解决方案，它们现在有点混乱。我可以很容易地将数据传递给我的api，但文件上传/多部分让我感到困惑。我发现这方面的资源很难找到，而且非常有限，特别是来自一个全职Android开发职位的资源。
我可以切换到Alamofire，但我的整个项目还没有使用它。我想等一下再换。我轻松地花了5个小时尝试组合，以显示最轻微的通过数据，但仍一无所获。
下面是我的python代码的开始：
if request.method == 'POST':
email = request.POST.get('email')
token = request.POST.get('token')
certnbr = request.POST.get('certnbr')
title = request.POST.get('title')
newCert = request.POST.get('newCert')
expires = request.POST.get('expires')
expirydate = request.POST.get('expiryDate')
issuedate = request.POST.get('issueDate')
picfile = request.FILES.get('image')
data = {}
#get the user
u = Usr.objects.get(email__iexact=email)一些我不太了解的来源：
fluffy.es -“这段代码在我看来太马虎了？”
medium article -“我在这里找不到传递参数的提示”
令我惊讶的是，所有这些来源之间的不一致，只有少数人甚至使用uploadTask，加上我读到了十几个其他似乎不同的来源。Alamofire到底是不是最佳选择？为什么苹果不直接采用它呢？整个过程都出乎意料的困难，提前感谢大家的帮助。
编辑:我切换到了Alamofire，立即变得更容易。
回答 1
Stack Overflow用户
发布于 2019-04-26 09:09:29
虽然对我的问题不是最好的回答，但Alamofire代码更简洁。所以为了给未来的我省去一些压力。只要用Alamofire就行了。
let ImageData = imageobj.pngData()
let urlReq = URL(string: "http://127.0.0.1:8000/api/newCertification/")!
print("params")
let params : Parameters = ["email": myEmail, "token": myToken, "certnbr": certnbr, "title": title, "newCert": newCert, "expires": expires, "expiryDate": expiryDate as Any, "issueDate": issueDate as Any]
print("time to upload")
Alamofire.upload(multipartFormData: { multipartFormData in
multipartFormData.append(ImageData!, withName: "avatar",fileName: "file.jpg", mimeType: "image/jpg")
for (key, value) in params {// this will loop the 'parameters' value, you can comment this if not needed
multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)
}
},
to:urlReq)
{ (result) in
switch result {
case .success(let upload, _, _):
upload.uploadProgress(closure: { (progress) in
print("Upload Progress: \(progress.fractionCompleted)")
})
upload.responseJSON { response in
//completion("success")
}
case .failure(let encodingError):
print(encodingError)
//completion("failed")
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55863760
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