我有一个带有文本字段的UIAlertController，允许用户在将数据发送到服务器之前输入标题来命名文件。但是，后端可能会因多种原因拒绝该文件，并且需要显示错误。如何在我输入文件名的同一警报 Controller 中显示从服务器返回的错误？
class FileController: UIViewController
{
var alertController: UIAlertController?
func savePressed()
{
createAlert()
}
func createAlert()
{
self.alertController = UIAlertController(title: "Save", message: "Name your file.", preferredStyle: .Alert)
let saveAsPublicAction = UIAlertAction(title: "Make Public", style: .Default) { (_) in
let fileTitle = self.alertController!.textFields![0] as UITextField
if fileTitle.text != ""
{
self.initiateSave(fileTitle.text!, share: true)
}
}
let saveAsPrivateAction = UIAlertAction(title: "Make Private", style: .Default) { (_) in
let fileTitle = self.alertController!.textFields![0] as UITextField
if fileTitle.text != ""
{
self.initiateSave(fileTitle.text!, share: false)
}
}
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (_) in }
self.alertController!.addTextFieldWithConfigurationHandler { (textField) in
NSNotificationCenter.defaultCenter().addObserverForName(UITextFieldTextDidChangeNotification, object: textField, queue: NSOperationQueue.mainQueue()) { (notification) in
saveAsPrivateAction.enabled = textField.text != ""
saveAsPublicAction.enabled = textField.text != ""
}
}
self.alertController!.addAction(saveAsPublicAction)
self.alertController!.addAction(saveAsPrivateAction)
self.alertController!.addAction(cancelAction)
self.presentViewController(self.alertController!, animated: true, completion: nil)
}
}
func initiateSave(title:String?, share: Bool?)
{
//package file
initiatePost()
}
func initiatePost()
{
//Send file data to server. Receive any errors and handle
}
最佳答案
在您的服务器上，您可以添加更多逻辑来发送包含该信息的 JSON 数据。
例如:
{
"success": true,
"message": "Data received sucessfully"
}
如果请求成功，如果不成功:
{
"success": false,
"message": "There is an error"
}
因此，当您解析该 JSON 时，您将检查 success 是否为 false，并在 message 键内显示错误消息。
关于ios - 使用 UIAlertController 进行错误处理，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38024249/