![](/img/trans.png)
[英]Why am I getting a Unexpectedly found nil while implicitly unwrapping an Optional value in my Code?
[英]i am getting a nil value somewhere in my code and i am unsure where it is and how to fix it
這是我收到的error
錯誤:執行被中斷,原因:EXC_BAD_INSTRUCTION(代碼= EXC_I386_INVOP,子代碼= 0x0)。
我知道錯誤是由代碼中某處的nil
值引起的,但我找不到它。 這是任何人對nil
值在哪里都有任何見識的代碼,那么將不勝感激。
import UIKit
var randomNumber = 0
var challengesArray = [""]
var challengeNumber = 0
var mad : String = ""
var challenge : String = ""
func ChallengeBankSplitter() {
let fileURLProject = Bundle.main.path(forResource: "Challenges", ofType: "txt")
var readStringProject = ""
do {
readStringProject = try String(contentsOfFile: fileURLProject!, encoding: String.Encoding.utf8)
} catch let error as NSError {
print ("Failed to read from project")
print (error)
}
challengesArray = readStringProject.components(separatedBy: ".") as Array
var arrayLength = challengesArray.count
randomNumber = arrayLength
}
func ChallengeSelector() {
ChallengeBankSplitter()
challengeNumber = Int((arc4random_uniform(UInt32(randomNumber))))
challenge = challengesArray[challengeNumber]
print (challenge)
}
ChallengeSelector()
我可以給下面的變量提供默認值
var randomNumber = 0
var challengesArray = [""]
var challengeNumber = 0
var mad : String = ""
var challenge : String = ""
因此,如果您遇到零問題,則訪問上面的內容一定不是問題。 因此,請確保訪問所有其他變量(如果為可選,則首先檢查是否為可選),然后使用if let
或guard
來避免在運行時訪問nil導致崩潰。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.