如何在今天午夜获取 NSDate 对象? [英] How can I get an NSDate object for today at midnight?

问题描述

获取表示当天午夜的 NSDate 对象的最有效方法是什么?

What is the most efficient way to obtain an NSDate object that represents midnight of the current day?

推荐答案

试试这个:

NSDate *const date = NSDate.date;
NSCalendar *const calendar = NSCalendar.currentCalendar;
NSCalendarUnit const preservedComponents = (NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay);
NSDateComponents *const components = [calendar components:preservedComponents fromDate:date];
NSDate *const normalizedDate = [calendar dateFromComponents:components];

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