objective-c : Subclassing UIDocument 심플 예제

snippet.m

Subclassing UIDocument 심플 예제

.h

@property (strong) NSString * noteContent;


.m

//Two override points, one when read and one when write.

//Called when the application reads data from the file system
- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError **)outError
{
	if ([contents length] > 0) {
		self.noteContent = [[NSString alloc] initWithBytes:[contents bytes]
                                                    length:[contents length]
                                                  encoding:NSUTF8StringEncoding];
	} else {
        
        // When the note is created, assign default content
        self.noteContent = @"Empty";
	}
	
    [[NSNotificationCenter defaultCenter] postNotificationName:@"noteModified" object:self];
	
	return YES;
}


// Called when the application (auto)saves the content of a note
- (id)contentsForType:(NSString *)typeName error:(NSError **)outError
{
	if ([self.noteContent length] == 0) {
		self.noteContent = @"Empty";
	}
    
	return [NSData dataWithBytes:[self.noteContent UTF8String]
                          length:[self.noteContent length]];
}