Simple Alert View written in Swift

// Set title, message and alert style
let alertController = DOAlertController(title: "title", message: "message", preferredStyle: .Alert)

// Create the action.
let cancelAction = DOAlertAction(title: "Cancel", style: .Cancel, handler: nil)

// You can add plural action.
let okAction = DOAlertAction(title: "OK" style: .Default) { action in
    NSLog("OK action occured.")
}

// Add the action.
alertController.addAction(cancelAction)
alertController.addAction(okAction)

// Show alert
presentViewController(alertController, animated: true, completion: nil)

alertController.addTextFieldWithConfigurationHandler { textField in
    // text field(UITextField) setting
    // ex) textField.placeholder = "Password"
    //     textField.secureTextEntry = true
}

alertController.overlayColor = UIColor(red:235/255, green:245/255, blue:255/255, alpha:0.7)

alertController.alertViewBgColor = UIColor(red:44/255, green:62/255, blue:80/255, alpha:1)

alertController.titleFont = UIFont(name: "GillSans-Bold", size: 18.0)
alertController.titleTextColor = UIColor(red:241/255, green:196/255, blue:15/255, alpha:1)

alertController.messageFont = UIFont(name: "GillSans-Italic", size: 15.0)
alertController.messageTextColor = UIColor.whiteColor()

alertController.buttonFont[.Default] = UIFont(name: "GillSans-Bold", size: 16.0)
alertController.buttonTextColor[.Default] = UIColor(red:44/255, green:62/255, blue:80/255, alpha:1)
alertController.buttonBgColor[.Default] = UIColor(red: 46/255, green:204/255, blue:113/255, alpha:1)
alertController.buttonBgColorHighlighted[.Default] = UIColor(red:64/255, green:212/255, blue:126/255, alpha:1)
// Default style : [.Default]
// Cancel style : [.Default] → [.Cancel]
// Destructive style : [.Default] → [.Destructive]