我正在上传大小小于1.5 MB的图像（在imagePickerController中选择），之后将其保存为Userdefault，但是当我尝试获取它时，其大小会增加。因此，在将其上传到Multipart时，我再次尝试将其压缩如下。它给我“ 2122字节”。可以的，因为它不到1.5 MB。但主要问题是我无法上传。
let compressData = UIImage(data:UserDefaultValues.imagep1! as Data)!.jpegData(compressionQuality: 0)
print("length:", UIImage(data:compressData!)!.jpegData(compressionQuality: 0)!)//2122 bytes
let compressData2 = UIImage(data:UserDefaultValues.imagep3! as Data)?.jpegData(compressionQuality: 0)
print("length2:", UIImage(data:compressData2!)!.jpegData(compressionQuality: 0)!)//2122 bytes
multipartFormData: { multipartFormData in
multipartFormData.append(compressData!, withName: "image", fileName: "", mimeType: "image/png")
multipartFormData.append("\(storyid)".data(using: .utf8)! , withName: "story_id")
multipartFormData.append(compressData2!, withName: "series_image", fileName: "", mimeType: "image/png")
multipartFormData.append("\(seriesid)".data(using: .utf8)! , withName: "series_id")
},
[Image Compression extension可能有助于您保持可发送图像大小的一致性。
上传multipartFormData
Alamofire.upload(multipartFormData: { multipartFromData in
if !fileData.isEmpty {
multipartFromData.append(fileData, withName: "file", fileName: "\(UUID().uuidString).png", mimeType: "image/png")
}
}, to:URL , method: .post, headers: headers, encodingCompletion: { result in
print(result)
switch result {
case .success(let upload, _, _):
upload.validate(statusCode: 200 ..< 300).responseString(completionHandler: { _ in
print("Upload success")
})
case .failure(let error):
print(error.localizedDescription)
}
})
这里是通过示例代码将图像上传到服务器上的步骤
第1步：使用URLSession上传图像
var croppedImage = UIImage()
func imageUploadRequest(){
let getUserData :UserDefaults = UserDefaults.standard
let User_Id = getUserData.value(forKey: "userid")
print("userid :\(String(describing: User_Id))!)")
let myUrl = NSURL(string: "Enter API String Here");
let request = NSMutableURLRequest(url:myUrl! as URL);
request.httpMethod = "POST";
let param = [
"user_id" : "\(User_Id!)",
]
let boundary = generateBoundaryString()
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
//Pass image in compressImage function
let compressedImage = self.compressImage(image: croppedImage)
//Convert It NSData To UIImage and also pass scale value for compression
convertedImage = UIImage(data:compressedImage as Data,scale:1.0)!
print("print Lates compress image size : \(convertedImage.size)")
let imageData = UIImageJPEGRepresentation(convertedImage, 1)
if(imageData==nil) { return; }
request.httpBody = createBodyWithParameters(parameters: param, filePathKey: "fileToUpload", imageDataKey: imageData! as NSData, boundary: boundary) as Data
//Pass This converted Image To Server
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
if error != nil {
print("error=\(String(describing: error))")
return
}
// You can print out response object
print("******* response = \(String(describing: response))")
// Print out reponse body
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("****** response data = \(responseString!)")
//Show Alert after successfull uploaded
DispatchQueue.main.async {
//resolved view is not hiararchy issue.
let createProfileVC = UIStoryboard(name: "Main", bundle:nil).instantiateViewController(withIdentifier: "CreateProfileViewController") as! CreateProfileViewController
let appDelegate = (UIApplication.shared.delegate as! AppDelegate)
appDelegate.window?.rootViewController = createProfileVC
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary
print(json)
self.imageView.image = nil;
}catch
{
print(error)
}
}
task.resume()
}
func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, imageDataKey: NSData, boundary: String) -> NSData {
let body = NSMutableData();
if parameters != nil {
for (key, value) in parameters! {
body.appendString(string: "--\(boundary)\r\n")
body.appendString(string: "Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.appendString(string: "\(value)\r\n")
}
}
let filename = "profileImage"
let mimetype = "image/jpg"
body.appendString(string: "--\(boundary)\r\n")
body.appendString(string: "Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString(string: "Content-Type: \(mimetype)\r\n\r\n")
body.append(imageDataKey as Data)
body.appendString(string: "\r\n")
body.appendString(string: "--\(boundary)--\r\n")
return body
}
func generateBoundaryString() -> String {
return "Boundary-\(NSUUID().uuidString)"
}
Step2：图像压缩
//Need to convert NSData to UIImage
func compressImage(image:UIImage) -> NSData {
// Reducing file size to a 10th
var actualHeight : CGFloat = image.size.height
var actualWidth : CGFloat = image.size.width
var maxHeight : CGFloat = 1136.0
var maxWidth : CGFloat = 640.0
var imgRatio : CGFloat = actualWidth/actualHeight
var maxRatio : CGFloat = maxWidth/maxHeight
var compressionQuality : CGFloat = 0.5
if (actualHeight > maxHeight || actualWidth > maxWidth){
if(imgRatio < maxRatio){
//adjust width according to maxHeight
imgRatio = maxHeight / actualHeight;
actualWidth = imgRatio * actualWidth;
actualHeight = maxHeight;
}
else if(imgRatio > maxRatio){
//adjust height according to maxWidth
imgRatio = maxWidth / actualWidth;
actualHeight = imgRatio * actualHeight;
actualWidth = maxWidth;
}
else{
actualHeight = maxHeight;
actualWidth = maxWidth;
compressionQuality = 1;
}
}
var rect = CGRect(x: 0.0, y:0.0 , width:actualWidth , height: actualHeight)
UIGraphicsBeginImageContext(rect.size);
image.draw(in: rect)
var img = UIGraphicsGetImageFromCurrentImageContext();
let imageData = UIImageJPEGRepresentation(img!, compressionQuality);
UIGraphicsEndImageContext();
return imageData as! NSData;
}
}
扩展名NSMutableData {
func appendString(string: String) {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
append(data!)
}
}
答案：
func sendStorySeriesImage(seriesid: Int, storyid: Int){
let sv = UIViewController.displaySpinner(onView: view)
guard let compressData2 = (UIImage(data:UserDefaultValues.imagep1! as Data)!).jpegData(compressionQuality: 0.5) else {
return
}
guard let compressData = (UIImage(data:UserDefaultValues.imagep1! as Data)!).jpegData(compressionQuality: 0.5) else {
return
}
let url = URL(string: Constants.wevlrBaseUrl + Constants.privateLink + Constants.createstoryseriesImage)!
Alamofire.upload(
multipartFormData: { multipartFormData in
multipartFormData.append("\(storyid)".data(using: .utf8)! , withName: "story_id")
multipartFormData.append("\(seriesid)".data(using: .utf8)! , withName: "series_id")
multipartFormData.append(compressData, withName: "image", fileName: "\(UUID().uuidString).jpg", mimeType: "image/jpg")
multipartFormData.append(compressData2, withName: "series_image", fileName: "\(UUID().uuidString).jpg", mimeType: "image/jpg")
},
to: url,
method : .post,
headers : Constants.headers,
encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
upload.responseJSON { response in
debugPrint(response)
switch response.result {
case .success(let data):
UIViewController.removeSpinner(spinner: sv)
let dict = response.result.value as! NSDictionary
let statusCode = response.response?.statusCode
if(statusCode == 201) {
UIViewController.removeSpinner(spinner: sv)
self.alert(title: "Success!", message: (dict["msg"] as? String)!)
}else{
UIViewController.removeSpinner(spinner: sv)
self.alert(title: "Alert!", message: (dict["msg"] as? String)!)
}
break
case .failure(_):
self.alert(title: "Alert!", message: "Something went wrong. Please try again.")
break
}
}
case .failure(_):
self.alert(title: "Alert!", message: "Something went wrong. Please try again.")
break
}
}
)
}