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
在Swift 3中，
let date = Date()
let calendar = Calendar.current()
let hour = calendar.component(.hour, from: date)
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……
仅用于特定格式的日期
let dateFormatter1 = NSDateFormatter()
dateFormatter1.dateStyle = .MediumStyle
dateFormatter1.timeStyle = .NoStyle
dateFormatter1.dateFormat = "dd-MM-yyyy"
let date = dateFormatter1.stringFromDate(NSDate())
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()
使用Date Formatter -Swift 3.0
//Date
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
let dateString = "Current date is: \(dateFormatter.string(from: Date() as Date))"
labelfordate.text = String(dateString)
//Time
let timeFormatter = DateFormatter()
timeFormatter.timeStyle = .medium
let timeString = "Current time is: \(timeFormatter.string(from: Date() as Date))"
labelfortime.text = String(timeString)
每秒钟更新一次日期和时间
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(DateAndTime.action), userInfo: nil, repeats: true)
}
func action()
{
//Date
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
let dateString = "Current date is: \(dateFormatter.string(from: Date() as Date))"
labelfordate.text = String(dateString)
//Time
let timeFormatter = DateFormatter()
timeFormatter.timeStyle = .medium
let timeString = "Current time is: \(timeFormatter.string(from: Date() as Date))"
labelfortime.text = String(timeString)
}
注意:定时器代码中的DateAndTime是类名。
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!
}
