Add data to native iPhone app from our application in iPhone

If I develop an app through which we can choose a date and 开发者_C百科time and enter a text and that text should be added for the corresponding date and time of the native I phone calendar. Is there any way to achieve that?

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Yes, should be possible using the EventKit framework (introduced in iOS 4.0). EKEvent is the class you're probably looking for.

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I use this code

EKEventStore *eventStore = [[EKEventStore alloc] init];
if ([eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)])
{
    // the selector is available, so we must be on iOS 6 or newer
    [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (error)
            {
                // display error message here
            }
            else if (!granted)
            {
                // display access denied error message here
            }
            else
            {
                // access granted
                // ***** do the important stuff here *****
            }
        });
    }];
}
else
{
    // this code runs in iOS 4 or iOS 5
    // ***** do the important stuff here *****
}