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
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)"
}
其他回答
Swift 3更新:
let date = Date()
let calendar = Calendar.current
let hour = calendar.component(.hour, from: date)
let minutes = calendar.component(.minute, from: date)
我是这样做的:
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute, fromDate: date)
let hour = components.hour
let minutes = components.minute
在objective-c中看到同样的问题，我如何从NSDate中获得小时和分钟?
和Nate的答案相比，你得到的是数字，而不是字符串……
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))")
Xcode 8.2.1•Swift 3.0.2
extension Date {
var hour: Int { return Calendar.autoupdatingCurrent.component(.hour, from: self) }
}
let date = Date() // "Mar 16, 2017, 3:43 PM"
let hour = date.hour // 15
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)"
}
斯威夫特5
func printTimestamp() {
let timestamp = DateFormatter.localizedString(from: NSDate() as Date, dateStyle: .medium, timeStyle: .short)
print(timestamp)
}
和调用函数printTimestamp()
