如何在NSDate变量中只设置时间？ [英] How can I set only time in NSDate variable?

问题描述

我有NSDate变量，只想更改时间（不应更改日期）。是否有可能？

I have NSDate variable and would like to change only time (date shouldn't be changed). Is it possible ?

例如：用户在DatePicker日期选择日期间隔（如果是开始日期我想将时间设置为00:00:00，如果它是结束日期，我将时间定为23:59:59）

Eg: user pick date interval in DatePicker date (If it's start date I would like to set time as 00:00:00, if it's end date, I set time as 23:59:59)

感谢大家的帮助。

此致，Alex 。

推荐答案

你会想要使用 NSDateComponents 。

NSDate *oldDate = datePicker.date; // Or however you get it.
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate];
comps.hour   = 23;
comps.minute = 59;
comps.second = 59;
NSDate *newDate = [calendar dateFromComponents:comps];

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