Parse check if object was created today? Objective

问题:

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.

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

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

回答1:

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

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.