Swift結構錯誤

Question

我正在嘗試創建一個有趣的事實應用程序。 每次都會從數組中顯示一個隨機字符串，然后將該事實從數組中刪除。 對於我來說，代碼在首次啟動應用程序時會獲取新的事實數組，並在應用程序關閉時保存數據，並在首次啟動后每次都使用前一次啟動時的數組。 我的問題是我的代碼的第四行出現錯誤“調用中參數＃1缺少參數”。 請幫助我，我是編程的新手。

import Foundation
let userDefaults = NSUserDefaults.standardUserDefaults()

func isAppAlreadyLaunchedOnce()->Bool{
    let defaults = NSUserDefaults.standardUserDefaults()

    if let isAppAlreadyLaunchedOnce = defaults.stringForKey("isAppAlreadyLaunchedOnce"){
        println("App already launched")
        return true
    }
    else{
        defaults.setBool(true, forKey: "isAppAlreadyLaunchedOnce")
        println("App launched first time")
        return false
    }
}

struct newFactBook {


    let factsArray = [
        "Ants stretch when they wake up in the morning.",
        "Ostriches can run faster than horses.",
        "Olympic gold medals are actually made mostly of silver.",
        "You are born with 300 bones; by the time you are an adult you will have 206.",
        "It takes about 8 minutes for light from the Sun to reach Earth.",
        "Some bamboo plants can grow almost a meter in just one day.",
        "The state of Florida is bigger than England.",
        "Some penguins can leap 2-3 meters out of the water.",
        "On average, it takes 66 days to form a new habit.",
        "Mammoths still walked the earth when the Great Pyramid was being built."]

}

    var checkLaunch = isAppAlreadyLaunchedOnce()
    var oldFunFactsArray = []

    if(checkLaunch == false){
    oldFunFactsArray = newFactBook().factsArray
    }

    else if (checkLaunch == true){
    oldFunFactsArray = userDefaults.objectForKey("key") as! NSArray
    }



struct returnRandomFacts {
    func randomFacts() -> (String, Int){
        var unsignedArrayCount = UInt32(oldFunFactsArray.count)
        var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount)
        var randomNumber = Int(unsignedRandomNumber)
        return (oldFunFactsArray[randomNumber] as! String, randomNumber)

    }
}

returnRandomFacts.randomFacts().1 // error right here
println(oldFunFactsArray)
userDefaults.setObject(oldFunFactsArray, forKey:"key")
userDefaults.synchronize()

Answer 1

您需要初始化returnRandomFacts 。 嘗試以下returnRandomFacts().randomFacts().1