Question

您好我试图根据我的后端响应限制特定时间段内的日期选择器值。我推荐很多链接，但没有什么可以帮助我，这是我的代码。

    datePicker.datePickerMode = .time

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    let today = dateFormatter.string(from: Date())

    let preprTime = UserDefaults.standard.string(forKey: "PREPARATION_TIME")!
    let start = UserDefaults.standard.string(forKey: "START_TIME")!
    let end = UserDefaults.standard.string(forKey: "END_TIME")!
    //Prints--> preprTime = 30 Mins.,  start = 08:00:00, end = 23:00:00


    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss z"
    let startDt = dateFormatter.date(from: "\(today) \(start) z")
    let endDt = dateFormatter.date(from: "\(today) \(end) z")

    //Prints--> startDt = 2017-11-02 08:00:00 +0000, endDt = 2017-11-02 23:00:00 +0000

    let mins = preprTime.trimmingCharacters(in: CharacterSet(charactersIn: "01234567890").inverted)

    let startTime: Date = startDt!.addingTimeInterval(TimeInterval(Int(mins)! * 60))
    let endTime: Date = endDt!.addingTimeInterval(-(TimeInterval(Int(mins)! * 60)))

    //Prints--> startTime = 2017-11-02 08:30:00 +0000, endTime = 2017-11-02 22:30:00 +0000

    datePicker.minimumDate = startTime
    datePicker.maximumDate = endTime

    //Prints--> datePicker.minimumDate = 2017-11-02 08:30:00 +0000, datePicker.maximumDate = 2017-11-02 22:30:00 +0000

我想我差不多完成了，它打印了正确的值，但是datePicker的最小和最大日期没有正确设置。这意味着datePicker的minimumDate（时间）是今天下午2点，最大日期（时间）是今天下午11点59分。我不知道我在哪里做错了，有人可以帮助我触发这个......？在此先感谢....！

Answer 1

尝试根据时区差异调整mimimumDate和maximumDate

区别在于

let gmtDiff = TimeZone.current.secondsFromGMT()

我的时区是+5:30，所以我需要从开始和结束时间中减去它

var startDt = dateFormatter.date(from: "\(today) \(start) z")
startDt = startDt?.addingTimeInterval( -TimeInterval(gmtDiff))
var endDt = dateFormatter.date(from: "\(today) \(end) z")
endDt = endDt?.addingTimeInterval( -TimeInterval(gmtDiff))

设置DatePicker（最小和最大时间）Swift 3的特定时间间隔

1 个答案: