[iOS]UIAlertView (2)

UIAlert除了可以用來提示使用者外，還可以用來輸入帳密。

只要將UIAlertViewStyle屬性設定為LoginAndPasswordInput，

對話方塊中就會同時提供PlainTextInpu以及一個SecureTextInput。


使用textFieldAtIndex(index)方法，可以取得UITextField型別的文字方塊。


畫面如下

設定Button事件與連結

設定Label連結

程式碼

//
//  ViewController.swift
//  book
//
//  Created by boywhy chen on 2016/12/25.
//  Copyright © 2016年 boywhy chen. All rights reserved.
//

import UIKit

class ViewController: UIViewController,UIAlertViewDelegate {

    @IBOutlet weak var mLabel: UILabel!
    @IBOutlet weak var mButton: UIButton!
    
    //來個一組帳密
    let UserName:String = "boywhy"
    let Password:String = "1234"
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        //心情好，用個圓角按鈕
        mButton.layer.backgroundColor = UIColor.brownColor().CGColor
        mButton.layer.cornerRadius = 15
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    @IBAction func showAlertView(sender: AnyObject) {
        //create UIAlertView
        var alertView:UIAlertView = UIAlertView()
        
        alertView.title = "登入"
        alertView.message = "Welcome"
        alertView.delegate = self
        alertView.addButtonWithTitle("取消")
        alertView.addButtonWithTitle("登入")
        //Set Style to Login And Password
        alertView.alertViewStyle = UIAlertViewStyle.LoginAndPasswordInput
        alertView.show()
    }
    
    //處理函式名字固定是alertView
    func alertView(alertView:UIAlertView!,clickedButtonAtIndex buttonIndex:Int)
    {
        
        switch(buttonIndex)
        {
            case 0: //cancel button
                break
            case 1://login button
                var textUserName:UITextField = alertView.textFieldAtIndex(0)!
                var textPassword:UITextField = alertView.textFieldAtIndex(1)!
                if(textUserName.text == UserName && textPassword.text == Password)
                {
                    mLabel.text = "Welcom \(textUserName.text!)"
                }
                else
                {
                    mLabel.text = "login fail"
                }
                break
            default:
                mLabel.text = "error"
            }
        
        
    }


}

執行畫面

輸入正確帳密

輸入錯誤帳密

Swift比較特別的一點是字串的比較可以直接用== ，

和Java或C#不一樣，==只是比記憶體位置。