这里是使用示例代码在服务器上上传图片的一些步骤
Step1：使用 URLSession 上传图片
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：图片压缩
//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 NSMutableData {
func appendString(string: String) {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
append(data!)
}
}