如何解决 swift 中的日历问题？ （即使在 objective-c 也很高兴看到）

Question

日历实例的几种方法我都用过。所以，isDateInToday()和isDateInTomorrow()是影响UI部分的主要方法。让我们今天使用 isDateInToday() （我的本地时间是 2019 年 8 月 28 日 21:37:00 ），它显示如下：

00:00 - 4:59 (false)。这里 isDateInTomorrow() 显示 true

5:00 - 23:59 (true)

日历标识符是 公历

区域设置为 en_US

时区是 GMT (secondsFromGMT=0)

这是日历实例：

private var _calendar: Calendar = {
        var cal = Calendar.current
        cal.locale = Locale.current
        cal.timeZone = TimeZone(secondsFromGMT: 0)!
        return cal
    }()

这就是我创建日期的方式：

public var today: Date? {
        let date = Date()

        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        formatter.locale = .current
        let dateString = formatter.string(from: date)

        let formatterOut = DateFormatter()
        formatterOut.dateFormat = "yyyy-MM-dd HH:mm:ss"
        formatterOut.locale = Locale(identifier: "ru")
        formatterOut.timeZone = TimeZone(secondsFromGMT: 0)

        return formatterOut.date(from: dateString)
}

我应该怎么做才能在 00:00 和 23:59 之间显示今天的 true？

Answer 1

好吧，我还没有找到确切的解决方案。但我已经做到了。我为今天和明天创建了两个日期实例。

...
let today = Date()
...
let tomorrow = calendar.date(byAdding: .day, value: 1, to: today)

这就是我对 isDateInToday() 和 isDateInTomorrow() 的解决方案。我忽略了时间。

func isDateInToday(_ date: Date) -> Bool {
    let year = calendar.compare(date, to: today, toGranularity: .year)
    let month = calendar.compare(date, to: today, toGranularity: .month)
    let day = calendar.compare(date, to: today, toGranularity: .day)
    return (year == .orderedSame && month == .orderedSame && day == .orderedSame)
}

func isDateInTomorrow(_ date: Date) -> Bool {
    let year = calendar.compare(date, to: tomorrow, toGranularity: .year)
    let month = calendar.compare(date, to: tomorrow, toGranularity: .month)
    let day = calendar.compare(date, to: tomorrow, toGranularity: .day)
    return (year == .orderedSame && month == .orderedSame && day == .orderedSame)
}

Answer 2

尝试使用本地时区间隔创建日期：

let seconds: TimeInterval = TimeInterval(TimeZone.current.secondsFromGMT())
let date = Date(timeIntervalSinceNow: seconds)