我似乎无法理解为什么每当我运行测试程序时数组答案都是空的。
当我在 View Controller 1 中使用 println(finalResultsSegue) 时,我可以看到结果数组,但是当我将其传递给 View Controller 2 中的答案时,它会转到下一个屏幕,但数组仍为空。
View Controller 1
@IBAction func submitAll(sender: UIButton) {
let hasAnsweredAllQuestions = questions.reduce(true) { (x, q) in x && (q.usersAnswer != nil) }
println("has user answered all questions?: \(hasAnsweredAllQuestions)")
if hasAnsweredAllQuestions == true {
for (index, _) in enumerate(questions) {
userAnswers.append(questions[index].usersAnswer!)
correctAnswers.append(questions[index].answer!)
}
if userAnswers.count == 3 {
checkResults()
}
}
}
}
func checkResults() {
let answer = map(zip(correctAnswers, userAnswers)){
($0.0 == $0.1) ? "correct" : "wrong"
}
var finalResults = answer.map({"The following answer is \($0)"})
finalResultsSegue = finalResults
println(finalResultsSegue)
}
@IBAction func nextPage(sender: AnyObject) {
self.performSegueWithIdentifier("answerSummary", sender: sender)
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if(segue.identifier == "answerSummary") {
var answerSummary = segue.destinationViewController as! QuizResultsViewController
answerSummary.answers = finalResultsSegue
}
}
}
View Controller 2
class QuizResultsViewController: UIViewController {
@IBOutlet weak var testLabel: UILabel!
var answers: [String] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
println(answers)
}
最佳答案
您已将 prepareForSegue
作为 nextPage
内的嵌套函数。将其移到外面,它应该可以正常工作:
@IBAction func nextPage(sender: AnyObject) {
self.performSegueWithIdentifier("answerSummary", sender: sender)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if let answerSummary = segue.destinationViewController as? QuizResultsViewController
where segue.identifier == "answerSummary"
answerSummary.answers = finalResultsSegue
}
}
事实上,您不必在 func prepareForSegue...
前面添加 override
,这暗示您已将 prepareForSegue
放入错误的地方。
关于arrays - Segue 不传输数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30708062/