dataOfType not called in lion document based application

Question

Almost same to this issue.

I'm creating a new document based application for OS X Lion.

This document says, I must override dataOfType:error: and readFromData:ofType:error: in a subclass of NSDocument to read / write files, so I added these methods in my document class but they were never called when I selected Open or Save menu items.

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError *__autoreleasing *)outError {
    NSLog(@"Read from data");
    return NO;
}
- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {
    NSLog(@"data of type");
    return [NSData data];
}

I also tried to override writeToFile:ofType: and readFromFile:ofType but they also never got called. These methods were called when I created document based applications in Snow Leopard.

Why these methods are not get called?

Answer 1

The issue was solved. It seems that 'Use Core Data' option was checked.