[英]i am getting a nil value somewhere in my code and i am unsure where it is and how to fix it
Here is the error
i am receiving 这是我收到的
error
error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0).
错误:执行被中断,原因:EXC_BAD_INSTRUCTION(代码= EXC_I386_INVOP,子代码= 0x0)。
I know the error is caused by a nil
value somewhere in the code but i cannot find it. 我知道错误是由代码中某处的
nil
值引起的,但我找不到它。 Here is the code is anyone has any insight as to where the nil
value is then help would be appreciated. 这是任何人对
nil
值在哪里都有任何见识的代码,那么将不胜感激。
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()
As I can you have given default value for below variable 我可以给下面的变量提供默认值
var randomNumber = 0
var challengesArray = [""]
var challengeNumber = 0
var mad : String = ""
var challenge : String = ""
so accessing above must not an issue and if you facing nil issue. 因此,如果您遇到零问题,则访问上面的内容一定不是问题。 So make sure you access all other variable (check first optional or not) if optional then use
if let
or guard
to avoid crash via accessing nil at run time. 因此,请确保访问所有其他变量(如果为可选,则首先检查是否为可选),然后使用
if let
或guard
来避免在运行时访问nil导致崩溃。
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