Swift Core Data从特定日期获取结果

Question

I'm fairly new to ioS dev so this might be obvious.

With Core Data, I have an Entity : 'Post' , with an attribute for "dateAdded".

When the user selects an NSDate on a calendar- I want to fetch all the entries on that day only and load that into a table.

I was thinking of using a predicate where dateAdded (NSDate) would be equal to the calendarSelectedNSDate. But I don't think that would work as their NSDates would be different because of different times.

I would really appreciate a solution! Thank you!

Answer 1

Use NSCalendar to calculate the start and end of the selected date and create a predicate:

// get the current calendar
let calendar = NSCalendar.currentCalendar()
// get the start of the day of the selected date
let startDate = calendar.startOfDayForDate(calendarSelectedNSDate)
// get the start of the day after the selected date
let endDate = calendar.dateByAddingUnit(.Day, value: 1, toDate: startDate, options: NSCalendarOptions())!
// create a predicate to filter between start date and end date
let predicate = NSPredicate(format: "dateAdded >= %@ AND dateAdded < %@", startDate, endDate)