从[NSDate date]获取当前日期，但将时间设置为上午10:00 [英] get current date from [NSDate date] but set the time to 10:00 am

问题描述

如何重置从[NSDate date]检索的当前日期，然后将时间更改为早上10:00。

How can I reset the current date retrieved from [NSDate date] but then change the time to 10:00 in the morning.

推荐答案

与所有日期操作一样，您必须使用 NSDateComponents 和 NSCalendar

As with all date manipulation you have to use NSDateComponents and NSCalendar

NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian];
NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
[components setHour:10];
NSDate *today10am = [calendar dateFromComponents:components];

Apple推出了一种便捷方法，可以节省几行代码：

in iOS8 Apple introduced a convenience method that saves a few lines of code:

NSDate *d = [calendar dateBySettingHour:10 minute:0 second:0 ofDate:[NSDate date] options:0];

Swift：

let calendar: NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
let now: NSDate! = NSDate()

let date10h = calendar.dateBySettingHour(10, minute: 0, second: 0, ofDate: now, options: NSCalendarOptions.MatchFirst)!

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