我对 IOS 编程还是很陌生，在使用 Firebase 数据库和存储时遇到了问题。这是图像：
：
这是配置文件在编辑之前的样子。如果用户点击编辑按钮，我们将进入编辑模式。
在编辑过程中，我们更改了它的名称、描述、人物图标和横幅图片，当我们完成它时，它会回到这个配置文件并查看更新的文件。但是，编辑后，它返回的是这样的：
名称和描述确实改变了，但头像没有改变。事实上，如果我再次编辑配置文件，它将更新到我更改的最后一张图片。如果我退出并返回个人资料页面，它将显示正确的图片，这是最后更新的图片。这是我在配置文件视图控制器中的代码：
override func viewDidLoad() {
super.viewDidLoad()
print("The center of phone is: \(view.center.x) + \(view.center.y)")
print("The center of pic is: \(PersonIcon.center.x) + \(Banner.center.y)")
UserDataManager.getUserInfo(uid: user!.uid) { (userData) in
self.ProfileName.text = userData["UserName"]!
if (userData["UserBio"] != "NULL") {
self.ProfileBio.text = userData["UserBio"]!
}
if (userData["UserIconURL"] != "NULL") {
let url = URL(string: userData["UserIconURL"]!)
let task = URLSession.shared.dataTask(with: url!, completionHandler: { (data, _, error) in
guard let data = data, error == nil else {
print("Error trying to download user icon")
return
}
DispatchQueue.main.async {
let image = UIImage(data: data)
self.PersonIcon.image = image
print("Should be Updated?")
}
})
task.resume()
}
if (userData["UserBannerURL"] != "NULL") {
let url = URL(string: userData["UserBannerURL"]!)
let task = URLSession.shared.dataTask(with: url!, completionHandler: { (data, _, error) in
guard let data = data, error == nil else {
print("Error trying to download user Banner")
return
}
DispatchQueue.main.async {
let image = UIImage(data: data)
self.Banner.image = image
print("Should be Updated?")
}
})
task.resume()
}
}
makeRounded(ProfileImage: PersonIcon)
// Do any additional setup after loading the view.
}
并且函数ViewDidAppear是完全相同的代码（除了super.viewDidAppear(animated)）。我觉得这与线程有关，因为我确实将下载线程与主线程异步以确保配置文件得到更新，但我对 IOS 中的线程仍然很陌生，无法判断这是否是这里的问题. 请帮忙，谢谢！
编辑用户信息的代码：
@IBAction func onSubmit(_ sender: Any) {
// Todo: Submit the data to server and update user info
let DataManager = FirebaseDataAccessManager()
var url_id = "Nothing"
// To make sure we get uid before we upload, all the code regarding upload must be put inside this closure
DataManager.getUserInfo(uid: user!.uid) { (userData) in
url_id = userData["URL_ID"]!
DataManager.updateUserIcon(URL_ID: url_id, image: self.PersonIcon.image!) { (success, urlString) in
if (success) {
print("PersonIcon Upload Success!")
print("URL stored into the data is: \(urlString)")
DataManager.updateUserIconURL(uid: user!.uid, url: urlString)
}
}
DataManager.updateUserBanner(URL_ID: url_id, image: self.Banner.image!) { (success, urlString) in
if (success) {
print("PersonBanner Upload Success!")
print("URL stored into the data is: \(urlString)")
}
DataManager.updateUserBannerURL(uid: user!.uid, url: urlString)
}
}
DataManager.updateUserSetting(uid: user!.uid, UserName: self.PersonName.text as! String, UserBio: self.PersonBio.text as! String, UserKeyword: self.PersonKeyword.text as! String) { (success) in
if (success) {
self.navigationController?.popViewController(animated: true)
}
else {
print("We're not going anywhere cuz update failed!")
}
}
self.navigationController?.popViewController(animated: true)
}
让我知道您是否还需要在DataManager. 它是一个包含 Firebase 数据库 API 调用的辅助类。
代码viewDidAppear()：
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
UserDataManager.getUserInfo(uid: user!.uid) { (userData) in
self.ProfileName.text = userData["UserName"]!
if (userData["UserBio"] != "NULL") {
self.ProfileBio.text = userData["UserBio"]!
}
if (userData["UserIconURL"] != "NULL") {
let url = URL(string: userData["UserIconURL"]!)
let task = URLSession.shared.dataTask(with: url!, completionHandler: { (data, _, error) in
guard let data = data, error == nil else {
print("Error trying to download user icon")
return
}
DispatchQueue.main.async {
let image = UIImage(data: data)
self.PersonIcon.image = image
}
})
task.resume()
}
if (userData["UserBannerURL"] != "NULL") {
let url = URL(string: userData["UserBannerURL"]!)
let task = URLSession.shared.dataTask(with: url!, completionHandler: { (data, _, error) in
guard let data = data, error == nil else {
print("Error trying to download user Banner")
return
}
DispatchQueue.main.async {
let image = UIImage(data: data)
self.Banner.image = image
}
})
task.resume()
}
}
makeRounded(ProfileImage: PersonIcon)
}
更新：感谢@Pratik Prajapati，问题是我在图片更新之前过早地刷新了页面，所以我已经将我的代码重新写入其中，并且它有效！
@IBAction func onSubmit(_ sender: Any) {
// Todo: Submit the data to server and update user info
let DataManager = FirebaseDataAccessManager()
var url_id = "Nothing"
DataManager.updateUserSetting(uid: user!.uid, UserName: self.PersonName.text!, UserBio: self.PersonBio.text as! String, UserKeyword: self.PersonKeyword.text as! String) { (success) in
if (success) {
DataManager.getUserInfo(uid: user!.uid) { (userData) in
url_id = userData["URL_ID"]!
DataManager.updateUserIcon(URL_ID: url_id, image: self.PersonIcon.image!) { (success, urlString) in
if (success) {
print("PersonIcon Upload Success!")
print("URL stored into the data is: \(urlString)")
DataManager.updateUserIconURL(uid: user!.uid, url: urlString)
DataManager.updateUserBanner(URL_ID: url_id, image: self.Banner.image!) { (success, urlString) in
if (success) {
print("PersonBanner Upload Success!")
print("URL stored into the data is: \(urlString)")
self.navigationController?.popViewController(animated: true)
}
DataManager.updateUserBannerURL(uid: user!.uid, url: urlString)
}
}
}
}
}
else {
print("We're not going anywhere cuz update failed!")
}
}
// To make sure we get uid before we upload, all the code regarding upload must be put inside this closure
}
但是，我确实认为这不是正确的方法。我实际上已经将 3 个完成块链接在一起，上传实际上需要一秒钟才能从编辑切换回配置文件。我肯定做错了什么。关于如何改进此代码的任何建议？如果我有 10 个信息而不是 3 个要更新怎么办？我不能将 10 个完成块链接在一起！
无论如何，感谢提供信息的家伙。我确实学到了很多东西！