将 Firebase 更新到版本 4 并更正所有 200 个错误后，我收到 2 条警告，导致我的应用程序崩溃。我查找了这个错误并尝试了解决方案但没有成功:
storageReference.downloadURLWithCompletion()
一定是我做错了:
func setUserInfo(_ user: User!, usersname: String, email: String, password: String, cell: String, data: Data!) {
// Create Path for User Image
let imagePath = "images/riders/\(user.uid)/Profile Pic/userPic.jpg"
// Create image Reference
let imageRef = rDataService.Instance.storageRef.child(imagePath)
// Create Metadata for the image
let metaData = StorageMetadata()
metaData.contentType = "image/jpeg"
// Save the user Image in the Firebase Storage File
imageRef.putData(data as Data, metadata: metaData) { (metaData, error) in
if error == nil {
let changeRequest = user.createProfileChangeRequest()
changeRequest.displayName = usersname
changeRequest.photoURL = metaData?.downloadURL()
changeRequest.commitChanges(completion: { (error) in
if error == nil {
self.saveUser(user, usersname: usersname, email: email, password: password, cell: cell)
} else {
print(error!.localizedDescription)
}
})
} else {
print(error!.localizedDescription)
}
}
}
错误发生在这一行:
changeRequest.photoURL = metaData?.downloadURL()
编辑
调整后，在这一行得到警告:
if let profilepicMetaData = profilepicMetaData {
error: Value 'profilepicMetaData' was defined but never used; consider replacing with boolean test
应用仍然崩溃:
// Save the user profile Image in the Firebase Storage File
imageRef.putData(data as Data, metadata: profilepicMetaData) { (profilepicMetaData, error) in
if let profilepicMetaData = profilepicMetaData {
imageRef.downloadURL(completion: { (url, error) in
guard let url = url else {
if let error = error {
print(error)
}
return
}
let changeRequest = user.createProfileChangeRequest()
changeRequest.displayName = usersname
changeRequest.photoURL = url
changeRequest.commitChanges(completion: { (error) in
if error == nil {
self.saveUser(user, usersname: usersname, email: email, password: password, year: year, makeAndModel: makeAndModel, cell: cell, plateNo: plateNo)
} else {
print(error!.localizedDescription)
}
})
})
} else {
print(error!.localizedDescription)
}
}
崩溃!
最佳答案
需要使用原始存储引用对象imageRef获取下载地址。 (请通过代码查看注释):
imageRef.putData(data, metadata: profilepicMetaData) {
// use if let to unwrap the metadata returned to make sure the upload was successful. You can use an underscore to ignore the result
if let _ = $0 {
// start the async method downloadURL to fetch the url of the file uploaded
imageRef.downloadURL {
// unwrap the URL to make sure it is not nil
guard let url = $0 else {
// if the URL is nil unwrap the error, print it
if let error = $1 {
// you can present an alert with the error localised description
print(error)
}
return
}
// your createProfileChangeRequest code needs to be run after the download url method completes. If you place it after the closure it will be run before the async method finishes.
let changeRequest = user.createProfileChangeRequest()
changeRequest.displayName = usersname
changeRequest.photoURL = url
changeRequest.commitChanges {
// unwrap the error and print it
if let error = $0 {
// again you might present an alert with the error
print(error)
} else {
// user was updated successfully
self.saveUser(user, usersname: usersname, email: email, password: password, year: year, makeAndModel: makeAndModel, cell: cell, plateNo: plateNo)
}
}
}
} else if let error = $1 {
// present an alert with the error
print(error)
}
}
关于ios - 不确定在代码中放置 storageRef.downloadURL 的位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54758190/