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import UIKit class ViewController: UIViewController { @IBOutlet weak var display: UILabel! var userIsInputingDigit :Bool = false @IBAction func appendDigit(sender: UIButton) { let digit = sender.currentTitle! if userIsInputingDigit { display.text = display.text! + digit }else { display.text = digit userIsInputingDigit = true } } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } }
来自: https://itunes.apple.com/us/course/developing-ios-8-apps-swift/id961180099
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原文地址:http://my.oschina.net/itfanr/blog/381043