解析检查对象是否是今天创建的?目标-C [英] Parse check if object was created today? Objective-C

问题描述

我正在尝试为我的应用程序编写一个 PFQuery，它只返回今天创建的对象.随着 NSDate 发生的所有贬值以及 NSDateFormatter 的重要性日益增加，我发现很难做到这一点.

I am trying to write a PFQuery for my application that returns only objects that were created today. With all the depreciations that happened to NSDate and the growing importance of NSDateFormatter I am finding rather hard to go about this.

我已经在伪代码中找到了这样的逻辑:

I have figured the logic to be like this in pseudo-code:

Query q = new Query();
q.whereDateGreaterThan(midnightThisMorning);
q.whereDateLessThan(midnightTonight);

我似乎无法弄清楚如何将 NSDate 对象设置为 12:00 AM(即 midnightThisMorning)并将另一个设置为 11:59今晚下午(将是 midnightTonight).

I can't seem to figure out how to get a NSDate object set to 12:00 AM (which would be midnightThisMorning) and another set to 11:59 PM tonight (which would be midnightTonight).

推荐答案

查看 NSCalendar 的 startOfDayForDate 方法来查找当天的开始.

Check out NSCalendar's startOfDayForDate method to find the start of the current day.

要查找当天的结束时间，您需要在从 startOfDayForDate 返回的日期中添加一天，然后减去一秒.

To find the end of the current day, you'll want to add a day to the date returned from startOfDayForDate and then subtract one second.

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