Convert EventKit object to NSDictionary, for making it easy to serialize in JSON format.

EKEventKit+Serialize.m

//
// Convert EventKit object to NSDictionary, for making it easy to serialize in JSON format.
//
#import "EventKit+Serializer.h"

@implementation EKCalendarItem (Serializer)

- (NSDictionary *)toDictionary
{
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    
    dict[@"calendarItemIdentifier"] = self.calendarItemIdentifier;
    dict[@"calendarItemExternalIdentifier"] = self.calendarItemExternalIdentifier;

    dict[@"creationDate"] = [self.creationDate description];
    dict[@"lastModifiedDate"] = [self.lastModifiedDate description];
    
    if (self.timeZone) dict[@"timeZone"] = [self.timeZone description];
    
    if (self.URL) dict[@"URL"] = [self.URL description];
    dict[@"title"] = self.title;
    if (self.location) dict[@"location"] = self.location;
    if (self.hasNotes) dict[@"notes"] = self.notes;

    // alarms
    if (self.hasAlarms) {
        NSMutableArray *alarms = [NSMutableArray arrayWithCapacity:self.alarms.count];
        for (EKAlarm *alarm in self.alarms) {
            NSDictionary *alarmDict = @{@"absoluteDate": [alarm.absoluteDate description], @"relativeOffset":[NSNumber numberWithDouble:alarm.relativeOffset]};
            [alarms addObject:alarmDict];
        }
        dict[@"alarms"] = alarms;
    }

    // attendees
    if (self.hasAttendees) {
        // TODO
    }
    
    // recurrence
    if (self.hasRecurrenceRules) {
        NSMutableArray *rules = [NSMutableArray arrayWithCapacity:self.recurrenceRules.count];
        for (EKRecurrenceRule *rule in self.recurrenceRules) {
            [rules addObject:[rule toDictionary]];
        }
        dict[@"recurrenceRules"] = rules;
    }

    return dict;
}

@end


@implementation EKCalendar (Serializer)

- (NSDictionary *)toDictionary
{
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    dict[@"calendarIdentifier"] = self.calendarIdentifier;
    dict[@"title"] = self.title;
    
    return dict;
}

@end


@implementation EKReminder (Serializer)

- (NSDictionary *)toDictionary
{
    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithDictionary:[super toDictionary]];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    dict[@"startDateComponents"] = [[calendar dateFromComponents:self.startDateComponents] description];
    dict[@"dueDateComponents"] = [[calendar dateFromComponents:self.dueDateComponents] description];
    dict[@"completionDate"] = [self.completionDate description];
    
    return dict;
}

@end

@implementation EKRecurrenceRule (Serializer)

- (NSDictionary *)toDictionary
{
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    dict[@"frequency"] = [NSNumber numberWithInt:self.frequency];
    dict[@"interval"] = [NSNumber numberWithInteger:self.interval];

    return dict;
}

@end