我當前的代碼旨在為加密錢包密鑰生成 Sha-256 哈希，然后將其列印給我，以便我確認它是否正常作業。這是我的代碼。順便說一句，我是初學者，我還有很多東西要學。
import Foundation
import SwiftUI
struct dataManager {
let characterArray = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","f"]
@State private var privKey = "0x"
init() {
for _ in 1...64 {
privKey = characterArray[Int(arc4random_uniform(16))]
print(privKey)
}
}
}
問題是init函式似乎從未被呼叫過，所以我沒有得到任何列印到控制臺的東西。我嘗試除以零以查看是否有崩潰，但沒有崩潰，這讓我相信它沒有被呼叫或類似的東西。
編輯：我應該補充一點，如果我嘗試在 init 之外使用 for 回圈，我只會收到“預期宣告”錯誤。我做了一些研究，我認為 init 是我應該在這種情況下使用的。
任何幫助將不勝感激！
uj5u.com熱心網友回復：
正如評論中提到的，@State僅在 SwiftUI 中使用View。
還有一些其他的小錯誤，比如"e"在你的陣列中遺漏了。
這是您的代碼的作業版本，盡可能少地修改：
struct DataManager {
let characterArray = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"]
var privKey = "0x"
init() {
for _ in 1...64 {
privKey = characterArray[Int(arc4random_uniform(16))]
print(privKey)
}
}
}
let manager = DataManager()
print(manager.privKey)
請注意，您可以進一步重構它。這是另一個本質上有點 Swift 的迭代：
struct DataManager {
let characterArray = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"]
var privKey = "0x"
init() {
privKey = (1...64).map { _ in characterArray.randomElement()! }.joined()
}
}
或者：
struct DataManager {
var privKey = "0x" (1...64).map { _ in ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"].randomElement()! }.joined()
}
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