UIButton에 target action을 swift code로 추가하기

"...:" :를 빼먹지 말기.

https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithObjective-CAPIs.html#//apple_ref/doc/uid/TP40014216-CH4-XID_36

• import UIKit
• class MyViewController: UIViewController {
• let myButton = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 50))
• init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
• super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
• myButton.addTarget(self, action: "tappedButton:", forControlEvents: .TouchUpInside)
• }
• func tappedButton(sender: UIButton!) {
• println("tapped button")
• }
• }