Hi all,
I try to create a very simple list of persons that will be displayed
in a NSTableView. I have a few options like: save the list using
NSArchive, load a list from the disk, adding, removing entries.
The data source is a NSObject subclass which implements:
-(int) numberOfRowsInTableView:(NSTableView*) tableView
-(id) tableView:(NSTableView *)tableView
objectValueForTableColumn:(NSTableColumn *) tableColumn
row:(int) row
Also the datasource conforms to NSCoding protocol.
Now the problem:
I can save the data on the disc using
-(void) encodeWithCoder:(NSCoder*) encoder;
but when I try to load the data from the disk in
-(id) initWithCoder:(NSCoder*) encoder I see the NSMutableArray loaded
with all data but in
-(int) numberOfRowsInTableView:(NSTableView*) tableView the array is
emtpy and I cannot see nothing in my NSTableView.
I know that's a very simple problem but I m new in Objective C (I
migrate from C++/Symbian) so..please help.
I put the code if you want to take a look.
@interface DataController : NSObject <NSCoding> {
IBOutlet NSTableView *tblTableView;
NSMutableArray *persons;
}
-(void) addNewPersonWithFirstName:(NSString *) firstName andLastName:
(NSString*) lastName andPhoneNumber:(NSString *) phoneNumber;
-(id) initWithCoder:(NSCoder*) encoder;
-(void) encodeWithCoder:(NSCoder*) encoder;
@end
@implementation DataController
-(id) init
{
self=[super init];
persons=[[NSMutableArray alloc] init];
return self;
}
-(id) initWithCoder:(NSCoder*) encoder
{
self=[super init];
NSMutableArray *aux=[encoder decodeObject];
[aux retain];
[persons release];
persons=aux;
return self;
}
-(void) encodeWithCoder:(NSCoder *) encoder
{
[encoder encodeObject:persons];
}
-(int) numberOfRowsInTableView:(NSTableView*) tableView
{
return [persons count];
}
-(id) tableView:(NSTableView *)tableView
objectValueForTableColumn:(NSTableColumn *) tableColumn
row:(int) row
{
NSString *identifier=[tableColumn identifier];
Person *p=[persons objectAtIndex:row];
return [p valueForKey:identifier];
}
-(void) addNewPersonWithFirstName:(NSString *) firstName andLastName:
(NSString *) lastName andPhoneNumber:(NSString *) phoneNumber
{
Person *p=[[Person alloc] init];
p.firstName=firstName;
p.lastName=lastName;
p.phoneNumber=phoneNumber;
[persons addObject:p];
[p release];
[tblTableView reloadData];
[tblTableView selectRow:0 byExtendingSelection:NO];
}
-(void) dealloc
{
[persons release];
[super dealloc];
}
@end
=
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