从操场开始。我正在尝试创建一个简单的应用程序。

我创建了一个date对象,就像这样:

var date = NSDate()

我怎样才能得到当前的时间?在其他语言中,我可以这样做:

var hour = date.hour

但我找不到任何这样的属性/方法。我找到了一个方法,dateWithCalendarFormat。我应该用这个吗?如果是,怎么做?


当前回答

斯威夫特4:

extension Date
{
    func hour() -> Int
    {
    //Get Hour
    let calendar = Calendar.current
    let components = calendar.component(.hour, from: self)
    let hour = components

    //Return Hour
    return hour
    }


    func minute() -> Int
    {
    //Get Minute
    let calendar = Calendar.current
    let components = calendar.component(.minute, from: self)
    let minute = components

    //Return Minute
    return minute
        }
}

其他回答

你可以试试这个

func getTime() -> (hour:Int, min:Int, sec:Int) {
        let currentDateTime = NSDate()
        let calendar = NSCalendar.currentCalendar()
        let components = calendar.components([.Hour,.Minute,.Second], fromDate: currentDateTime)
        let hour = components.hour
        let min = components.minute
        let sec = components.second
        return (hour,min,sec)
    }

现在调用该方法并接收带有小时、分钟和秒的日期

    let currentTime = self.getTime()
    print("Hour: \(currentTime.hour) Min: \(currentTime.min) Sec: \(currentTime.sec))")

以下代码是最新的swift版本(5):

func getTimestamp()-> String {
     let timestamp = DateFormatter.localizedString(from: Date(), dateStyle: .medium, timeStyle: .short)
     return "\(timestamp)"
}

您可以在Date上创建一个扩展,这样您就可以轻松地在其他文件中调用它。下面是一个使用计算属性的日期扩展示例。

它会打印出来:“今天,下午4:55”

extension Date {

    var formatter: DateFormatter? {
        let formatter = DateFormatter()
        formatter.dateStyle = .short
        formatter.timeStyle = .short
        formatter.doesRelativeDateFormatting = true

        return formatter
    }
}

迅速回答:

 let date = NSDate()
 let calendar = NSCalendar.currentCalendar()
 let components = calendar.components([.Hour, .Minute], fromDate: date)
 let hour = components.hour
 let minutes = components.minute

使用Swift 5 (Xcode 10 & Xcode 11)(来自法国UTC)

func getCurrentDateTime() {
    let now = Date()
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "fr_FR")
    formatter.dateFormat = "EEEE dd MMMM YYYY HH:mm"
    myLabel.text = formatter.string(from: now)
    myLabel.font = UIFont(name: "HelveticaNeue-Light", size: 12)
    myLabel.textColor = UIColor.black
}

如果您只想显示日期,请设置formatter.dateFormat

formatter.dateFormat = "EEEE dd MMMM YYYY"

若要只显示小时,请更改格式化程序。dateFormat来

formatter.dateFormat = "HH:mm"

不要忘记在viewDidLoad上添加getCurrentDateTime()。