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
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))")
其他回答
扩展noiiv的史诗般的简洁解决方案，这里是更简洁的Swift 3/4实现:
斯威夫特3/4
let components = Calendar.current.dateComponents([.hour, .minute], from: Date())
let (hour, minute) = (components.hour, components.minute)
同时，扩展Leo Dabus的扩展，我们可以有:
extension Date {
func components(_ components: Set<Calendar.Component>) -> DateComponents {
return Calendar.current.dateComponents(components, from: self)
}
func component(_ component: Calendar.Component) -> Int {
return Calendar.current.component(component, from: self)
}
var era: Int { return component(.era) }
var year: Int { return component(.year) }
var month: Int { return component(.month) }
var day: Int { return component(.day) }
var hour: Int { return component(.hour) }
var minute: Int { return component(.minute) }
var second: Int { return component(.second) }
var weekday: Int { return component(.weekday) }
var weekdayOrdinal: Int { return component(.weekdayOrdinal) }
var quarter: Int { return component(.quarter) }
var weekOfMonth: Int { return component(.weekOfMonth) }
var weekOfYear: Int { return component(.weekOfYear) }
var yearForWeekOfYear: Int { return component(.yearForWeekOfYear) }
var nanosecond: Int { return component(.nanosecond) }
var calendar: Calendar? { return components([.calendar]).calendar }
var timeZone: TimeZone? { return components([.timeZone]).timeZone }
}
像这样使用它:
let date = Date()
let (hour, minute) = (date.hour, date.minute)
你可以用swift 4或5像bellow
let date = Date()
let df = DateFormatter()
df.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateString = df.string(from: date)
输出将像波纹管
2019-12-20 09:40:08
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
}
}
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()
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
