iCal4ObjC is a Objective-C implementation of the iCalendar specification as defined in RFC2455 for iOS and OS X.

Parsing iCalendar objects

#import "CGICalendar.h"
	
CGICalendar *ical = [[CGICalendar alloc] init];
if ([ical parseWithPath:icalPath error:nil]) {
	// your logic here
}

Traversing iCalendar objects

To traverse the all objects, components, properties and parameters in a iCalendar, use the following:

for (CGICalendarObject *icalObj in self.objects) {
    for (CGICalendarComponent *icalComp in icalObj.components) {
        NSString *icalCompType = icalComp.type;
        // your logic here
        for (CGICalendarProperty *icalProp in icalComp.properties) {
            NSString *icalPropName = icalProp.name;
            NSString *icalPropValue = icalProp.value;
            // your logic here
            for (CGICalendarParameter *icalParam in icalProp.parameters) {
            	// your logic here
                NSString *icalParamName = icalProp.name;
                NSString *icalPropValue = icalProp.value;
            }
        }
    }
}

Adding objects, components or properties

To add your objects, components and properties into a iCalendar instance, use the following:

CGICalendar *ical = [[CGICalendar alloc] init];

// Add a object
CGICalendarObject *icalObj = [[CGICalendarObject alloc] initWithProdid:@"//CyberGarage//iCal4ObjC//EN"];
[ical addObject:icalObj];

// Add a component
CGICalendarComponent *icalComp = [[CGICalendarComponent alloc] initWithType:@"VTODO"];
[icalObj addComponent:icalComp];

// Add a property
CGICalendarProperty *icalProp = [[CGICalendarProperty alloc] init];
[icalProp setName:@"SUMMARY"];
[icalProp setValue:@"Write report"];
[icalComp addComponent:icalProp];

Writing iCalendar objects

To export a iCalendar object into a file, use the following:

CGICalendar *ical = …;
[ical writeToFile:@"MyToDo.ics"];