如何重置从 [NSDate date] 检索到的当前日期，然后将时间更改为早上 10:00。
与所有日期操作一样，您必须使用NSDate组件 https://developer.apple.com/documentation/foundation/nsdatecomponents and NS日历 https://developer.apple.com/documentation/foundation/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];
在iOS8中Apple引入了一种方便的方法，可以节省几行代码：
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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