UIImageJPEGRepresentation 已被实例方法 UIImage.jpegData(compressionQuality:) 替换答案

【问题标题】：UIImageJPEGRepresentation has been replaced by instance method UIImage.jpegData(compressionQuality:)UIImageJPEGRepresentation 已被实例方法 UIImage.jpegData(compressionQuality:) 替换
【发布时间】：2019-01-02 23:55:49
【问题描述】：

我尝试将照片上传到 Firebase，但它给了我这个错误。它在 Xcode 10 之前工作。我收到此错误：

“UIImageJPEGRepresentation”已被实例方法“UIImage.jpegData(compressionQuality:)”替换

我不知道如何使用这个功能。

import UIKit
import Firebase

class SignUpViewController:UIViewController {
    @IBOutlet weak var profileImageView: UIImageView!
    @IBOutlet weak var tapToChangeProfileButton: UIButton!

    var continueButton:RoundedWhiteButton!
    var imagePicker:UIImagePickerController!

    override func viewDidLoad() {
        super.viewDidLoad()

          continueButton.addTarget(self, action: #selector(handleSignUp), for: 
          .touchUpInside)
        let imageTap = UITapGestureRecognizer(target: self, action: 
        #selector(openImagePicker))
        profileImageView.isUserInteractionEnabled = true
        profileImageView.addGestureRecognizer(imageTap)
        profileImageView.layer.cornerRadius = profileImageView.bounds.height / 2
        profileImageView.clipsToBounds = true

        imagePicker = UIImagePickerController()
        imagePicker.allowsEditing = true
        imagePicker.sourceType = .photoLibrary
        imagePicker.delegate = self
    }

    func uploadProfileImage(_ image:UIImage, completion: @escaping ((_ url:URL?)->())) {
        guard let uid = Auth.auth().currentUser?.uid else { return }
        let storageRef = Storage.storage().reference().child("user/\(uid)")

        guard let imageData = UIImageJPEGRepresentation(image, 0.75) else { return }

        let metaData = StorageMetadata()
        metaData.contentType = "image/jpg"

        storageRef.putData(imageData, metadata: metaData) { metaData, error in
            if error == nil, metaData != nil {
                if let url = metaData?.downloadURL() {
                    completion(url)
                } else {
                    completion(nil)
                }
                // success!
            } else {
                // failed
                completion(nil)
            }
        }
    }
}

【问题讨论】：

标签： ios swift swift4 ios12

【解决方案1】：

错误告诉您，从 iOS 12 开始，旧的 UIImageJPEGRepresentation 函数已被 UIImage 上的新 jpegData 方法替换。

变化：

let imageData = UIImageJPEGRepresentation(image, 0.75)

到：

let imageData = image.jpegData(compressionQuality: 0.75)

同样，UIImagePNGRepresentation 的使用已替换为 pngData()。

【讨论】：

【解决方案2】：

只需替换

guard let imageData = UIImageJPEGRepresentation(image, 0.75) else { return }

与：

guard let imageData = image.jpegData(compressionQuality: 0.75) else { return }

【讨论】：

【解决方案3】：

这个错误发生在ios 12和swift 4.2版本。

let image = UIImage()
let imageData = UIImageJPEGRepresentation(image, 1)

to:

let image = UIImage()
let imageData = image.jpegData(compressionQuality: 0.50)

你想这样改变。请试试这个它对我有用。

【讨论】：