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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