ios - 如何快速解决日历问题？ (很高兴即使在 Objective-c 中也能看到)

Question

我使用了日历实例的几种方法。所以，isDateInToday()和isDateInTomorrow()是对UI部分起作用的主要方法。今天我们使用 isDateInToday() (我的本地时间是 2019 年 8 月 28 日 21:37:00 )，它显示以下内容:

00:00 - 4:59 (假)。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

时区为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)
}

我该怎么做才能使其在今天 00:00 到 23:59 之间显示 true？

Answer 1

嗯，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)
}