您可以使用日期的描述来比较两个日期。
let date1 = NSDate()
let date2 = NSDate(timeIntervalSinceNow: 120)
if date1.description == date2.description {
print(true)
} else {
print(false)
}
如果您想将日期的时间元素设置为不同的时间,可以按照以下方法操作:
extension NSDate {
struct Calendar {
static let gregorian = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
}
var day: Int { return Calendar.gregorian.component(.Day, fromDate: self) }
var month: Int { return Calendar.gregorian.component(.Month, fromDate: self) }
var year: Int { return Calendar.gregorian.component(.Year, fromDate: self) }
var noon: NSDate {
return Calendar.gregorian.dateWithEra(1, year: year, month: month, day: day, hour: 12, minute: 0, second: 0, nanosecond: 0)!
}
}
let date1 = NSDate()
let date2 = NSDate(timeIntervalSinceNow: 120)
print(date1.noon == date2.noon)
或者您也可以使用NSDateFormatter来完成这个任务:
extension NSDate {
struct Date {
static let formatterYYYYMMDD: NSDateFormatter = {
let formatter = NSDateFormatter()
formatter.dateFormat = "yyyyMMdd"
return formatter
}()
}
var yearMonthDay: String {
return Date.formatterYYYYMMDD.stringFromDate(self)
}
func isSameDayAs(date:NSDate) -> Bool {
return yearMonthDay == date.yearMonthDay
}
}
let date1 = NSDate()
let date2 = NSDate(timeIntervalSinceNow: 120)
print(date1.yearMonthDay == date2.yearMonthDay)
print(date1.isSameDayAs(date2))
另一种选择(适用于iOS8+)是使用日历方法isDate(inSameDayAsDate :):
extension NSDate {
struct Calendar {
static let gregorian = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
}
func isInSameDayAs(date date: NSDate) -> Bool {
return Calendar.gregorian.isDate(self, inSameDayAsDate: date)
}
}
let date1 = NSDate()
let date2 = NSDate(timeIntervalSinceNow: 120)
if date1.isInSameDayAs(date: date2 ){
print(true)
} else {
print(false)
}
NSDateFormatter
来实现这个目的。 - The Paramagnetic Croissant