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swiftでIBOutlet, IBAction

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@IBOutlet@IBActionで宣言するとstoryboardからも認識されます。
以下はタップしたUIButtonのタイトルを変更するサンプルです。
objective-cで書くときと同じようにstoryboardから@IBOutlet@IBActionをつないであげて下さい。


import UIKit

class ViewController: UIViewController {

    @IBOutlet var button:UIButton
    @IBAction func buttonTapped(sender:AnyObject) {
        var tappedButton:UIButton = sender as UIButton
        tappedButton.setTitle("tapped", forState:UIControlState.Normal)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        button.setTitle("tap me", forState:UIControlState.Normal)
    }

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

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