Question

我正在尝试在我的应用中实现忘记密码功能，以便用户可以输入他们的电子邮件并将其重置在数据库中，并通过电子邮件将新生成的密码发送给他们。

我相信一旦解决了一些小问题，我的代码就可以运行，但我遇到的主要障碍是如何从另一条警报消息的处理程序中显示警告消息。

知道怎么做吗？警报消息根本不显示，或者第一个警报消息根本不关闭。

以下是我的尝试：

    //This function will send a password reset email
func emailPassword(alertAction: UIAlertAction!) -> Void {
    let textField = reset_alert.textFields![0] as UITextField

    if(!textField.text!.isEmpty){

        if(textField != "mik"){
            let query = PFQuery(className: "_User")
            let forgotten_email = textField.text
            query.whereKey("email", equalTo: forgotten_email!)
            query.findObjectsInBackgroundWithBlock{
                (objects: [PFObject]?, error: NSError?) -> Void in

                //NO ERROR//
                if(error == nil){
                    //email in db generate random password
                    let letters : NSString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

                    let randomString : NSMutableString = NSMutableString(capacity: 12)
                    var users_name = ""

                    for _ in 0...10{
                        let length = UInt32 (letters.length)
                        let rand = arc4random_uniform(length)
                        randomString.appendFormat("%C", letters.characterAtIndex(Int(rand)))
                    }

                    //set new password for user
                    if let objects = objects {
                        for object in objects {
                            object["_hashed_password"] = randomString
                            users_name = object["name"] as! String

                            //send password to email
                            self.mailgun.sendMessageTo("\(users_name) <\(textField)>", from: "")

                            self.displayAlert("SUCCESS", msg: "Check your email for your new password")
                            self.reset_alert.dismissViewControllerAnimated(true, completion: nil)
                        }
                    }
                    else{
                        self.reset_alert.dismissViewControllerAnimated(true, completion: nil)
                        self.displayAlert("ERROR", msg: "Email not registered to an account")

                    }
                }

                    //ERROR//
                else{
                    self.reset_alert.dismissViewControllerAnimated(true, completion: nil)
                    self.displayAlert("ERROR", msg: "Email not registered to an account")                    }
            } //end if textfield not admin email

            self.presentViewController(reset_alert, animated: true, completion: nil)
        }
    }//end of if textfield is empty
}

Answer 1

试试此扩展程序：

typealias AlertActionBlock = (UIAlertAction) -> Void
extension UIViewController {
    func flash(title title:String?, message:String?, cancelTitle:String?, actions:UIAlertAction?...) {
        let b = {
            let alertController = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
            let cancelBlock:AlertActionBlock = {(action:UIAlertAction) -> Void in }
            let cancelAction = UIAlertAction(title: cancelTitle, style: UIAlertActionStyle.Cancel, handler: cancelBlock)
            alertController.addAction(cancelAction)
            for action in actions {if let action = action {alertController.addAction(action)}}
            self.presentViewController(alertController, animated: true, completion: nil)
        }
        if NSThread.isMainThread() {
            b()
        } else {
            dispatch_async(dispatch_get_main_queue(), b)
        }
    }
}

那应该让你从后台线程调用该函数，或者主线程只调用该函数并填入变量

编辑（我没有意识到你需要一个文本字段）所以试试这个：

func flash(title title:String?, message:String?, textFieldConfigurator:(UITextField -> Void)? = nil, cancelTitle:String?, actions:UIAlertAction?...) {
        let b = { () -> Void in
            let alertController = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
            if let textFieldConfigurator = textFieldConfigurator {alertController.addTextFieldWithConfigurationHandler(textFieldConfigurator)}
            let cancelBlock:AlertActionBlock = {(action:UIAlertAction) -> Void in }
            let cancelAction = UIAlertAction(title: cancelTitle, style: UIAlertActionStyle.Cancel, handler: cancelBlock)
            alertController.addAction(cancelAction)
            for action in actions {if let action = action {alertController.addAction(action)}}
            self.presentViewController(alertController, animated: true, completion: nil)
        }
        if NSThread.isMainThread() {
            b()
        } else {
            dispatch_async(dispatch_get_main_queue(), b)
        }
    }

如果您需要多个文本字段，请将其设为数组并迭代它。让我知道它是怎么回事！

Swift iOS如何显示来自另一个警报消息的处理程序的警报消息

1 个答案: