使用在Firebase中分配给用户配置文件的图像并将其附加到配置文件页面

Question

我一直在网上寻找帮助我的地方，但是我无法弄清楚。下面的代码说，允许用户注册时将图像存储在Firebase数据库中：

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 = image.jpegData(compressionQuality: 0.75 ) else {return}
    let metaData = StorageMetadata()
    metaData.contentType = "image/jpg."


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

func saveProfile(name: String, email: String, profileImageURL: URL, completion: @escaping ((_ success:Bool)->())){
    guard let uid = Auth.auth().currentUser?.uid else {return}

    let databaseRef = Database.database().reference().child("users/profile/\(uid)")


    let userObject = ["name":name, "email":email,
                      "photoURL":profileImageURL.absoluteString] as [String:Any]

    databaseRef.setValue(userObject) {error, ref in completion(error == nil)}
    }
}

此代码位于其他.swift文件中，可以让我获取照片：

static let cache = NSCache<NSString, UIImage>()

static func downloadImage(withURL url:URL, completion: @escaping (_ image:UIImage?, _ url:URL)->()) {
    let dataTask = URLSession.shared.dataTask(with: url) { data, responseURL, error in
        var downloadedImage:UIImage?

        if let data = data {
            downloadedImage = UIImage(data: data)
        }

        if downloadedImage != nil {
            cache.setObject(downloadedImage!, forKey: url.absoluteString as NSString)
        }

        DispatchQueue.main.async {
            completion(downloadedImage, url)
        }

    }

    dataTask.resume()
}

static func getImage(withURL url:URL, completion: @escaping (_ image:UIImage?, _ url:URL)->()) {
    if let image = cache.object(forKey: url.absoluteString as NSString) {
        completion(image, url)
    } else {
        downloadImage(withURL: url, completion: completion)
    }
}

用户个人资料代码：

class UserProfile {

var uid:String
var name:String
var photoURL:URL

init(uid:String, name:String, photoURL:URL){

    self.uid = uid
    self.name = name
    self.photoURL = photoURL



}

}

我添加了一个文件，该文件可让我从firebase中获取数据：

class ImageServices{

static let cache = NSCache<NSString, UIImage>()

static func downloadImage(withURL url:URL, completion: @escaping (_ image:UIImage?, _ url:URL)->()) {
    let dataTask = URLSession.shared.dataTask(with: url) { data, responseURL, error in
        var downloadedImage:UIImage?

        if let data = data {
            downloadedImage = UIImage(data: data)
        }

        if downloadedImage != nil {
            cache.setObject(downloadedImage!, forKey: url.absoluteString as NSString)
        }

        DispatchQueue.main.async {
            completion(downloadedImage, url)
        }

    }

    dataTask.resume()
}

static func getImage(withURL url:URL, completion: @escaping (_ image:UIImage?, _ url:URL)->()) {
    if let image = cache.object(forKey: url.absoluteString as NSString) {
        completion(image, url)
    } else {
        downloadImage(withURL: url, completion: completion)
    }
}

}

现在如何在我的viewController中使用它在imageView上实际显示图像？

Answer 1

对问题的最后编辑要求此

现在如何在我的viewController中使用它来实际显示图像在imageView上？？？

这表示您在询问如何将下载的图像分配给该imageView时，其中的viewController包含imageView。

图像已在您的代码中下载到此处

static func downloadImage(withURL...
        var downloadedImage:UIImage
        if let data = data {
            downloadedImage = UIImage(data: data)
因此，下面的一行代码将采用downloadedImage并将其显示在imageView中

self.myImageView.image = downloadImage