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
let dateFormatter : DateFormatter = DateFormatter()
// dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.dateFormat = "yyyy-MMM-dd HH:mm:ss"
let date = Date()
let dateString = dateFormatter.string(from: date)
let interval = date.timeIntervalSince1970
输出
2018 - 5月- 01 10:41:31
其他回答
Swift让创建和使用扩展变得非常容易。我创建了一个sharedCode.swift文件，并在其中放入枚举、扩展名和其他有趣的东西。我创建了一个NSDate扩展来添加一些典型的功能，这是费力和丑陋的输入一遍又一遍:
extension NSDate
{
func hour() -> Int
{
//Get Hour
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.Hour, fromDate: self)
let hour = components.hour
//Return Hour
return hour
}
func minute() -> Int
{
//Get Minute
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.Minute, fromDate: self)
let minute = components.minute
//Return Minute
return minute
}
func toShortTimeString() -> String
{
//Get Short Time String
let formatter = NSDateFormatter()
formatter.timeStyle = .ShortStyle
let timeString = formatter.stringFromDate(self)
//Return Short Time String
return timeString
}
}
使用这个扩展，你现在可以做一些事情，如:
//Get Current Date
let currentDate = NSDate()
//Test Extensions in Log
NSLog("(Current Hour = \(currentDate.hour())) (Current Minute = \(currentDate.minute())) (Current Short Time String = \(currentDate.toShortTimeString()))")
在上午11:51会写出来:
(当前小时= 11)(当前分钟= 51)(当前短时间字符串= 11:51 AM)
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
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
}
}
func getCurrentDate() -> Date {
let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let dateInString = dateFormatter.string(from: date)
let dateinDate = dateFormatter.date(from: dateInString)
return dateinDate!
}
这是SWIFT扩展，以获得您当前的设备位置时间(GMT)。
func getGMTTimeDate() -> Date {
var comp: DateComponents = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: self)
comp.calendar = Calendar.current
comp.timeZone = TimeZone(abbreviation: "GMT")!
return Calendar.current.date(from: comp)!
}
现在得到时间:-
Date().getGMTTimeDate()
