[英]Swift: Help on Extensions
class quizController: UIViewController {
@IBOutlet weak var questionLabel: UILabel!
@IBOutlet weak var button1: UIButton!
@IBOutlet weak var button2: UIButton!
@IBOutlet weak var button3: UIButton!
@IBOutlet weak var button4: UIButton!
var question : String
var options : [String]
var correctAns : Int
init() {
question = "What quiz are you taking?"
options = ["Medical", "Bollywood", "Math", "Trivia"]
correctAns = 0
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
extension CollectionType where Index == Int{
func shuffle() -> [Generator.Element] {
var readyToAskQuestions : [quizController] {
var questions = Array(question)
questions.count = questionNum
questions.shuffleInPlace()
return questions
}
convenience init() {
}
}
在var問題行中,我收到一條錯誤消息,說
“問題”是一個未解決的標識符
我知道該功能不在quizController類中,這就是原因,但是我需要該擴展名,以便可以隨意整理測驗問題。
我應該如何處理? 另外,我將從json文件中加載測驗問題,這就是為什么那里有一個方便的init方法,但是我收到了一條錯誤消息,指出
初始化程序只能在類型內聲明。
所以這意味着它需要在一個班級之內?
謝謝您的幫助。
試試這個代替你的代碼
var question = String()
var options = [String]()
var correctAns = Int()
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