喜欢它在标题中说,我试图改变标签文本点击一个按钮。错误出现在线self.playerChoice.text = "You: Rock"
Swift:标签文本 - >“致命错误:意外地发现零,同时展开一个可选值”
import UIKit
class ViewController: UIViewController {
var player : Int = Int()
@IBOutlet weak var readyLabel: UILabel!
@IBAction func noButton(sender: AnyObject) {
exit(0)
}
// ---------------------------------------------------------
@IBOutlet var computerChoice: UILabel!
@IBOutlet var playerChoice: UILabel!
@IBOutlet var score: UILabel!
// Variables -------------------------------------------------
let Rock : String = "Rock"
let Paper : String = "Paper"
let Scissors : String = "Scissors"
//------------------------------------------------------------
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
// ----------------------------------------------------------------
@IBAction func rockButton(rockbut: UIButton) {
player = 0
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Rock"
}
@IBAction func paperButton(paperbut: UIButton) {
player = 1
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Paper"
}
@IBAction func scissorsButton(scissorsbut: UIButton) {
player = 2
var ai = arc4random_uniform(3)
self.playerChoice.text = "You: Scissors"
}
}
“playerChoice”是否已初始化?你有连接IB的插座吗? – gagarwal 2014-11-24 20:46:25
应该是,我采取了添加标签 – artie711 2014-11-24 21:02:55