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

Massimo Camaro had a great answer. I took the liberty of porting it to Swift and modifying it a little to support a different column name.

Swift 2.0

func predicateToRetrieveEventsForDate(aDate:NSDate, predicateColumn:String) -> NSPredicate {
    
    // start by retrieving day, weekday, month and year components for the given day
    let gregorian = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
    let todayComponents = gregorian?.components([.Day, .Month, .Year], fromDate: aDate)
    let theDay = todayComponents?.day
    let theMonth = todayComponents?.month
    let theYear = todayComponents?.year
    
    // now build a NSDate object for the input date using these components
    let components = NSDateComponents()
    components.day = theDay!
    components.month = theMonth!
    components.year = theYear!
    let thisDate = gregorian?.dateFromComponents(components)
    
    // build a NSDate object for aDate next day
    let offsetComponents = NSDateComponents()
    offsetComponents.day = 1
    let nextDate = gregorian?.dateByAddingComponents(offsetComponents, toDate: thisDate!, options: NSCalendarOptions(rawValue: 0))
    
    // build the predicate
    let predicate = NSPredicate(format: "\(predicateColumn) >= %@ && \(predicateColumn) < %@", thisDate!, nextDate!)
    
    return predicate
}