這僅適用于整數值，我從另一個 stackoverflow 問題中發現了這一點，但是我如何設定樣式以允許小數位。我對 macOS 很陌生，感謝您的幫助！
class OnlyIntegerValueFormatter: NumberFormatter {
override func isPartialStringValid(_ partialString: String, newEditingString newString: AutoreleasingUnsafeMutablePointer<NSString?>?, errorDescription error: AutoreleasingUnsafeMutablePointer<NSString?>?) -> Bool {
// Ability to reset your field (otherwise you can't delete the content)
// You can check if the field is empty later
if partialString.isEmpty {
return true
}
// Optional: limit input length
if partialString.count > 8 {
return false
}
// Actual check
return Int(partialString) != nil
}
}
uj5u.com熱心網友回復：
要允許十進制數，您可以將 return 陳述句更新為以下內容
// ...
return number(from: partialString) != nil
}
然后你允許整數和十進制數
還有更多可用選項（例如maximumIntegerDigits）通過使用NumberFormatter（https://developer.apple.com/documentation/foundation/numberformatter）來限制您的輸入
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