ios - 我可以在 iOS 中获取日、周、月、年的本地化字符串吗？

Question

除了进行手动查找之外，这似乎是不可能的。

请注意，我不是要求本地化日期。我想要“日”、“周”、“月”、“年”的实际术语。

编辑：我正在寻找本地化的翻译。例如，如果我计算两个日期之间的 3 个月，我想向用户显示“3 个月”的本地化版本。希望有帮助。

Answer 1

我们可以从中提取它DateComponentsFormatter，这是我的日历扩展：

extension Calendar {
    mutating func localizedUnitTitle(_ unit: NSCalendar.Unit, value: Int = 1, locale: Locale? = nil) -> String {
        let emptyString = String()
        let date = Date()
        let component = getComponent(from: unit)
        guard let sinceUnits = self.date(byAdding: component, value: value, to: date) else {
            return emptyString
        }

        let formatter = DateComponentsFormatter()
        if locale != nil {
            self.locale = locale
        }
        formatter.calendar = self
        formatter.allowedUnits = [unit]
        formatter.unitsStyle = .full
        guard let string = formatter.string(from: date, to: sinceUnits) else {
            return emptyString
        }

        return string.replacingOccurrences(of: String(value), with: emptyString).trimmingCharacters(in: .whitespaces).capitalized
    }
    // swiftlint:disable:next cyclomatic_complexity
    private func getComponent(from unit: NSCalendar.Unit) -> Component {
        let component: Component

        switch unit {
        case .era:
            component = .era
        case .year:
            component = .year
        case .month:
            component = .month
        case .day:
            component = .day
        case .hour:
            component = .hour
        case .minute:
            component = .minute
        case .second:
            component = .second
        case .weekday:
            component = .weekday
        case .weekdayOrdinal:
            component = .weekdayOrdinal
        case .quarter:
            component = .quarter
        case .weekOfMonth:
            component = .weekOfMonth
        case .weekOfYear:
            component = .weekOfYear
        case .yearForWeekOfYear:
            component = .yearForWeekOfYear
        case .nanosecond:
            component = .nanosecond
        case .calendar:
            component = .calendar
        case .timeZone:
            component = .timeZone
        default:
            component = .calendar
        }
        return component
    }
}

用法：

var calendar = Calendar.current
let dayString = calendar.localizedUnitTitle(.day) //Day
let weekString = calendar.localizedUnitTitle(.weekOfMonth) //Week
let monthString = calendar.localizedUnitTitle(.month) //Month
let yearString = calendar.localizedUnitTitle(.year) //Year
let locale = Locale(identifier: "uk")
let secondString = calendar.localizedUnitTitle(.second, locale: locale) //Секунда

Answer 2

做这样的事情来获得语言环境中的星期几：

NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale: [NSLocale currentLocale]];
NSArray * weekdays = [dateFormatter weekdaySymbols];

如果你想要实际的单词“day”、“week”、“month”，我认为你必须使用 NSLocalizedString。

Answer 3

没有内置功能可以为您提供英文单词“day”、“week”等的本地化翻译。

你必须使用

 NSLocalizedString(@"day","");

并提供语言字符串资源。

Answer 4

您实际上可以使用DateComponentsFormatter.localizedString(from: to:). 这是文档。

这是一个方便的Calendar扩展：

extension Calendar {
  func period(unit component: Component, value: Int) -> String? {
    let present = Date()
    
    guard let future = date(byAdding: component, value: value, to: present) else { return nil }
    
    let period = dateComponents([component], from: present, to: future)
    
    return DateComponentsFormatter.localizedString(from: period, unitsStyle: .full)
  }
}

// Usage:
Calendar.current.period(unit: .month, value: 3) // "3 months"

另外，我不久前写了这篇关于相对日期的中篇文章，看看吧！

你可以只用一行来做到这一点：

DateComponentsFormatter.localizedString(from: 3.months, unitsStyle: .full) // "3 months"