NSPredicate- For finding events that occur between a certain date range

Question

This is a little more complicated then just

NSPredicate *predicate = [NSPredicate predicateWithFormat:@\"startDate >= %@ AND endDate <= %@\", startDay,         


        

Answer 1

While the proposed solution is correct, it is also quite verbose. I have re-implemented it in Swift 3.0:

import Foundation

extension NSPredicate {

    static func filter(key: String, onDayRangeForDate date: Date, calendar: Calendar = Calendar(identifier: .gregorian)) -> NSPredicate {

        let dateComponents = calendar.dateComponents([.day, .month, .year], from: date)

        let startOfDay = calendar.date(from: dateComponents)!

        let offsetComponents = NSDateComponents()
        offsetComponents.day = 1
        let endOfDay = calendar.date(byAdding: offsetComponents as DateComponents, to: startOfDay)!

        return NSPredicate(format: "\(key) >= %@ && \(key) < %@",
            startOfDay as NSDate, endOfDay as NSDate)
    }
}