如何将日期选择器日期更改为NSDate类型,但是为零秒 [英] How to change date picker date to a NSDate type but with zero seconds
问题描述
NSTimeInterval time = floor([date timeIntervalSinceReferenceDate] / 60.0)* 60.0;
return [NSDate dateWithTimeIntervalSinceReferenceDate:time];
其中 date
是datepicker的日期。那么如何在swift中实现这一点?
Swift几乎相同:
let date = NSDate()
let ti = floor(date.timeIntervalSinceReferenceDate / 60.0)* 60.0
let date1 = NSDate(timeIntervalSinceReferenceDate:ti)
使用 NSCalendar
方法也可以实现相同:
$ b $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $
cal.rangeOfUnit(.Minute,startDate:& date2,interval:nil,forDate:date)
$ b $这很有优势,它可以很容易地适应
更大的时间单位,如没有固定
长度的日,月等(例如,一天可以有23, 24或25小时在
夏令时的地区)。
I have a date picker that returns me a NSdate value. And I want to have a date value of seconds set to 0. I have the code to do it in objective c as
NSTimeInterval time = floor([date timeIntervalSinceReferenceDate] / 60.0) * 60.0;
return [NSDate dateWithTimeIntervalSinceReferenceDate:time];
where date
is the datepicker's date. So how to realise this in swift?
It is almost identical in Swift:
let date = NSDate()
let ti = floor(date.timeIntervalSinceReferenceDate/60.0) * 60.0
let date1 = NSDate(timeIntervalSinceReferenceDate: ti)
The same can be achieved with NSCalendar
methods:
let cal = NSCalendar.currentCalendar()
var date2 : NSDate?
cal.rangeOfUnit(.Minute, startDate: &date2, interval: nil, forDate: date)
and this has the great advantage that it can easily be adapted for larger time units like days, months, etc. which do not have a fixed length (e.g. a day can have 23, 24, or 25 hours in regions with daylight saving time).
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