ios - 如何在 swift 4 中减小照片大小并在参数中发送到我的服务器

Question

我正在使用 UIImagePickerController 拍照并将图像转换为 base64，我想将图像发送到我的服务器，但照片正在转换为 base64，但问题是我无法发送转换后的照片在参数中发送到我的服务器

这里是我的代码

@IBOutlet weak var CameraOutlet: UIButton!
@IBOutlet weak var Complaint_Image1: UIImageView!
@IBOutlet weak var Complaint_Image2: UIImageView!
@IBOutlet weak var Complaint_Image3: UIImageView!


func TakePhotos() {
    let Image = UIImagePickerController()
    Image.allowsEditing = true
    Image.sourceType = UIImagePickerControllerSourceType.camera
    Image.delegate = self

    present(Image, animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let picture = info[UIImagePickerControllerOriginalImage] as? UIImage {

        if (Complaint_Image1.image != nil && Complaint_Image2.image != nil) {
            Complaint_Image3.image = picture
        }
        else if Complaint_Image1.image != nil {
            Complaint_Image2.image = picture
        }
        else {
            Complaint_Image1.image = picture
        }
    }

    if Complaint_Image1.image != nil {
        let imageData:NSData = UIImagePNGRepresentation(Complaint_Image1.image!)! as NSData
        let imageStr = imageData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
        let imageBase64 = imageStr
        let imgstr2 = String.init(format: "data:image/png;base64,%@", imageBase64)

        UserDefaults.standard.set(imgstr2, forKey: "image")
        UserDefaults.standard.synchronize()
    }

    let picture1 = UserDefaults.standard.object(forKey: "image")
    let parameter = ["Image1": picture1!,"Image":[["name": picture2],["name": picture3]] as [String: Any]
}

Answer 1

在上传到服务器端之前，只需使用以下代码压缩图像

首先，将 uiimage 的以下扩展添加到任何类或单例类

extension UIImage {

//MARK:- convenience function in UIImage extension to resize a given image
func convert(toSize size:CGSize, scale:CGFloat) ->UIImage {
    let imgRect = CGRect(origin: CGPoint(x:0.0, y:0.0), size: size)
    UIGraphicsBeginImageContextWithOptions(size, false, scale)
    self.draw(in: imgRect)
    let copied = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return copied!
    }
}

然后在选择图像的 Controller 中编写以下方法

//MARK:- ImagePicker Delegate Methods

internal func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage
    // resize our selected image
    let resizedImage = chosenImage.convert(toSize:CGSize(width:100.0, height:100.0), scale: UIScreen.main.scale)
    profileImg.image = resizedImage
    dismiss(animated:true, completion: nil)
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: true, completion: nil)
}