swift - Uiimageview 获取图像后什么都不显示

Question

我是 Xcode 新手。我正在尝试获取存储在 firebase 中的图像。但。当我尝试输入代码时，它什么也没显示。我正在尝试打印图像，它是零。有很多教程，但每一个我都看不懂。

func loadUserDetail() {
    ref = Database.database().reference()
    imgStorage = Storage.storage().reference()

    let userID = Auth.auth().currentUser?.uid
    ref.child("User").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
        // Get user value
        let value = snapshot.value as? NSDictionary
        let username = value?["name"] as? String ?? ""
        let email = value?["email"] as? String ?? ""
        let address = value?["address"] as? String ?? ""
        let image = value?["image"] as? String ?? ""
        let phone = value?["phone"] as? String ?? ""
        let user = User(name: username, email: email, address: address, image : image, phone : phone)

        self.fullnameTF.text = user.name
        self.emailTF.text = user.email
        self.PhoneTF.text = user.phone

        let storageRef = self.imgStorage.child("User/\(userID!)/UserPic")
        storageRef.getData(maxSize: 1 * 1024 * 1024) { data, error in
            if let error = error {
                print("error: \(error.localizedDescription)")
            } else {
                let image = UIImage(data: data!)
                self.imgProfilePicture.image = image
            }
        }
    }) 
    { (error) in
        print(error.localizedDescription)
    }
}

我认为问题出在我上传从选取器获得的图像时:它显示图像大小为 0kb。

let fileData = NSData() // get data...
let storageRef = self.imgStorage.child("User/\(userUiD!)/UserPic")
storageRef.putData(fileData as Data).observe(.success) { (snapshot) in
// When the image has successfully uploaded, we get it's download URL
storageRef.downloadURL(completion: { (url, error) in
    if (error == nil) {
        if let downloadUrl = url {
            // Make you download string
            let downloadString = downloadUrl.absoluteString
            self.ref.child("User").child(userUiD!).child("image").setValue(downloadString)        
        }
    } else {
        print("Error To Saved")
    }
})
}}

Answer 1

您应该将 let fileData = NSData() 替换为您的图像数据。 NSData() 仅创建 0kb 的空数据对象，因此您应该将图像转换为如下数据:

 var fileData = UIImagePNGRepresentation(image)  // image is UIImage which you get from Picker

or 

 var fileData = UIImageJPEGRepresentation(image, 0.7)