我在我正在开发的应用程序中使用以下内容，它会弹出一个警告框以输入您的电子邮件并在新的警告框中确认结果：
@IBAction func resetPasswordPressed(sender: AnyObject) {
let titlePrompt = UIAlertController(title: "Reset password",
message: "Enter the email you registered with:",
preferredStyle: .Alert)
var titleTextField: UITextField?
titlePrompt.addTextFieldWithConfigurationHandler { (textField) -> Void in
titleTextField = textField
textField.placeholder = "Email"
}
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Default, handler: nil)
titlePrompt.addAction(cancelAction)
titlePrompt.addAction(UIAlertAction(title: "Reset", style: .Destructive, handler: { (action) -> Void in
if let textField = titleTextField {
self.resetPassword(textField.text)
}
}))
self.presentViewController(titlePrompt, animated: true, completion: nil)
}
func resetPassword(email : String){
// convert the email string to lower case
let emailToLowerCase = email.lowercaseString
// remove any whitespaces before and after the email address
let emailClean = emailToLowerCase.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
PFUser.requestPasswordResetForEmailInBackground(emailClean) { (success, error) -> Void in
if (error == nil) {
let success = UIAlertController(title: "Success", message: "Success! Check your email!", preferredStyle: .Alert)
let okButton = UIAlertAction(title: "OK", style: .Default, handler: nil)
success.addAction(okButton)
self.presentViewController(success, animated: false, completion: nil)
}else {
let errormessage = error!.userInfo!["error"] as! NSString
let error = UIAlertController(title: "Cannot complete request", message: errormessage as String, preferredStyle: .Alert)
let okButton = UIAlertAction(title: "OK", style: .Default, handler: nil)
error.addAction(okButton)
self.presentViewController(error, animated: false, completion: nil)
}
}
}
在使用 parse 同步之前将用户注册的电子邮件转换为小写也很聪明，就像我使用重置方法展示的那样。
如果您想放入一个活动指示器，以便用户在操作之间看到应用程序忙碌，请创建以下两个方法并在重置操作中调用 Pause() 并在操作之前或之后调用 Restore() resetPassword 方法中的 if/else。还包括以下类变量：
var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
func pause(){
activityIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 50, 50))
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
view.addSubview(activityIndicator)
activityIndicator.startAnimating()
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
}
func restore(){
activityIndicator.stopAnimating()
UIApplication.sharedApplication().endIgnoringInteractionEvents()
}