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我有一個帶有用戶列表的UITableView。當你點擊一行時，用戶的uid被傳遞給UIViewController詳細視圖。製作URLRequest以檢索用戶（用戶名，頭像等）的數據。但是，詳細視圖不一致地更新信息。有時會顯示用戶的姓名，頭像等，但其他時間它什麼也不顯示，或只顯示用戶名或只顯示頭像等。Swift 3/iOS UIView在檢索遠程JSON數據後沒有更新
在fetchUser()方法中，我有一個print("Username: \(self.user.username)")這表明正確的數據正在被100％的時間檢索，但它不會在視圖中100％的時間內顯示它。
任何幫助將不勝感激。
謝謝！
class ProfileViewController: UIViewController {
@IBOutlet weak var avatarImageView: UIImageView!
@IBOutlet weak var usernameLabel: UILabel!
@IBOutlet weak var networthLabel: UILabel!
var user: User!
var uid: Int?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
fetchUser()
}
func reloadView() {
self.usernameLabel.text = user.username
self.networthLabel.text = "$" + NumberFormatter.localizedString(from: Int((user.networth)!)! as NSNumber, number: NumberFormatter.Style.decimal)
self.avatarImageView.downloadImage(from: user.avatar!)
circularImage(photoImageView: self.avatarImageView)
}
func fetchUser() {
// Post user data to server
let myUrl = NSURL(string: "http://localhost/test/profile")
let urlRequest = NSMutableURLRequest(url: myUrl! as URL);
urlRequest.httpMethod = "POST"
let postString = "uid=\(uid!)"
urlRequest.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: urlRequest as URLRequest) { (data, response, error) in
if (error != nil) {
print("error=\(String(describing: error))")
return
} // end if
self.user = User()
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? [String : AnyObject]
if let parseJSON = json?["data"] as? [[String : AnyObject]] {
for userFromJson in parseJSON {
let userData = User()
if let uid = userFromJson["uid"] as? String,
let username = userFromJson["username"] as? String,
let networth = userFromJson["networth"] as? String,
let avatar = userFromJson["avatar"] as? String {
userData.uid = Int(uid)
userData.username = username
userData.networth = networth
userData.avatar = avatar
self.usernameLabel.text = username
self.networthLabel.text = networth
self.avatarImageView.downloadImage(from: avatar)
circularImage(photoImageView: self.avatarImageView)
} // end if
self.user = userData
} // end for
} // end if
DispatchQueue.main.async {
print("Username: \(self.user.username)")
self.reloadView()
}
} catch let error {
print(error)
}
}
task.resume()
}
謝謝蒂米！這固定它！我花了很多小時試圖弄清楚。我想我對多線程感到困惑。非常感謝您的幫助和修改後的代碼示例！ –
沒問題，很高興我可以幫忙:) – Timmy