用戶可以在我的應用中上傳個人資料圖片和一些關于他自己的資訊。我想在firebase實時資料庫中寫入上傳圖片的url，但它需要占位符文本“testentry”而不是真實的url。為什么我的完成在這里不起作用？
var imagePicker: UIImagePickerController!
var urltoPicture = "testentry"
@IBAction func updateProfile(_ sender: UIButton) {
uploadPic(arg: true, completion: { (success) -> Void in
if success {
linkUbertragen()
} else {
}
})
func uploadPic(arg: Bool, completion: @escaping (Bool) -> ()) {
guard let imageSelected = self.image else {
//print("ok")
return
}
guard let imageData = imageSelected.jpegData(compressionQuality: 0.1) else {
return
}
let storageRef = Storage.storage().reference(forURL: "gs://h......com")
let storageProfileRef = storageRef.child("profilePictures").child(Auth.auth().currentUser!.uid)
let metadata = StorageMetadata()
metadata.contentType = "image/jpg"
storageProfileRef.putData(imageData, metadata: metadata, completion: {
(storageMetadata, error) in
if error != nil {
//print(error?.localizedDescription)
return
}
storageProfileRef.downloadURL(completion: { (url, error) in
if let metaImageURL = url?.absoluteString {
print(metaImageURL)
self.urltoPicture = metaImageURL
}
})
})
completion(arg)
}
func linkUbertragen(){
ref = Database.database().reference()
let userID = Auth.auth().currentUser!.uid
ref.child("user/\(userID)").updateChildValues(["profileText": profileText.text!])
print(urltoPicture)
ref.child("user/\(userID)").updateChildValues(["picture": urltoPicture])
}
self.navigationController?.popViewController(animated: true)
}
uj5u.com熱心網友回復：
這是一個非常常見的錯誤。您必須在（最終）閉包內呼叫完成。
發生錯誤時總是呼叫是一個好習慣completion(false)——更好的方法是回傳并處理所有錯誤
func uploadPic(arg: Bool, completion: @escaping (Bool) -> ()) {
guard let imageSelected = self.image else {
//print("ok")
completion(false); return
}
guard let imageData = imageSelected.jpegData(compressionQuality: 0.1) else {
completion(false); return
}
let storageRef = Storage.storage().reference(forURL: "gs://h......com")
let storageProfileRef = storageRef.child("profilePictures").child(Auth.auth().currentUser!.uid)
let metadata = StorageMetadata()
metadata.contentType = "image/jpg"
storageProfileRef.putData(imageData, metadata: metadata, completion: {
(storageMetadata, error) in
if error != nil {
//print(error?.localizedDescription)
completion(false); return
}
storageProfileRef.downloadURL(completion: { (url, error) in
if let metaImageURL = url?.absoluteString {
print(metaImageURL)
self.urltoPicture = metaImageURL
completion(true)
} else {
completion(false)
}
})
})
}
該arg引數實際上是不需要的。
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