import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        // 建立
        let alertController = UIAlertController(title: "提示", message: "你確定要離開？"
 
, preferredStyle:.Alert)

        // 設定2個UIAlertAction
        let cancelAction = UIAlertAction(title: "取消", style: .Cancel, handler: nil)
        let okAction = UIAlertAction(title: "好的", style: .Default) { (UIAlertAction) in
            print("點選了好的")
        }

        // 新增
        alertController.addAction(cancelAction)
        alertController.addAction(okAction)

        // 彈出
 

        self.presentViewController(alertController, animated: true, completion: nil)
    }
}

// 除了彈出，還可以使用底部向上滑出的樣式
        // 注意：如果上拉選單中有『取消』按鈕的話，那麼它永遠都會出現在選單的底部，不管新增的次序如何

        // 建立
        // preferredStyle 為 ActionSheet
        let alertController = UIAlertController(title: "儲存或刪除資料", message: "刪除資料將不可恢復"
 
, preferredStyle:.ActionSheet)

        // 設定2個UIAlertAction
        let cancelAction = UIAlertAction(title: "取消", style: .Cancel, handler: nil)
        let deleteAction = UIAlertAction(title: "刪除", style: .Destructive, handler: nil)
        let saveAction = UIAlertAction(title: "儲存", style: .Default, handler: nil)

        // 新增到UIAlertController
        alertController.addAction(cancelAction)
        alertController.addAction(saveAction)
        alertController.addAction(deleteAction)

        // 彈出
        self.presentViewController(alertController, animated: true, completion: nil)

/*
        新增任意數量的文字輸入框（比如可以用來實現登入框）
         */

        let alertController = UIAlertController(title: "系統登入", message: "請輸入使用者名稱和密碼", preferredStyle: UIAlertControllerStyle.Alert)

        alertController.addTextFieldWithConfigurationHandler { (textField:UITextField) in
            textField.placeholder = "使用者名稱"
        }
        alertController.addTextFieldWithConfigurationHandler { (textField:UITextField) in
            textField.placeholder = "密碼"
            textField.secureTextEntry = true
        }

        let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
        let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default) { (UIAlertAction) in
            let login = alertController.textFields![0]
            let pwd = alertController.textFields![1]
            print("使用者名稱：\(login.text) 密碼：\(pwd.text)")
        }

        alertController.addAction(cancelAction)
        alertController.addAction(okAction)


        // 彈出
        self.presentViewController(alertController, animated: true, completion: nil)