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

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

其他回答

你可以使用Swift4或swif5如下所示:

let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let current_date = dateFormatter.string(from: date)
print("current_date-->",current_date)

输出:

2020-03-02

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))")

在Swift 3中,

    let date = Date()
    let calendar = Calendar.current()

    let hour = calendar.component(.hour, from: date)

一行Swift 5.2

let date = String(DateFormatter.localizedString(from: Date(), dateStyle: .medium, timeStyle: .short))

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()。