CODEWITHSUNDEEP
cocoasyntax-errornstableview
Alberto
Alberto

Reputation: 4282

Illegal DataSource, but everything is implemented fine

Getting :

*** Illegal NSTableView data source (<NSApplication: 0x101602bc0>).  Must implement numberOfRowsInTableView: and tableView:objectValueForTableColumn:row:

Code .h

    //
//  AppDelegate.h
//  MySQL
//
//  Created by - on 10/12/12.
//  Copyright (c) 2012 - Software. All rights reserved.
//

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate> {

    NSMutableArray *tabelle_totali;
    IBOutlet NSTableView *tabella_tabelle_totali;
    IBOutlet NSTableView *tabella_contenitore;

}

@property (assign) IBOutlet NSWindow *window;

//Metodo per scaricare dati
- (void) download_tabelle ;
//Manipolazione tabelle ricevute
- (void)tabelle_ricevute:(NSData *)tabelle;
//Refresh tabella
- (IBAction)refresh_tablelle:(id)sender;
//Refresh tabelle
- (int)numberOfRowsInTableView:(NSTableView *)aTableView;
- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(int)rowIndex;
@end

Code .m

//
//  AppDelegate.m
//  MySQL
//
//  Created by - on 10/12/12.
//  Copyright (c) 2012 Alberto Bellini Software. All rights reserved.
//

#import "AppDelegate.h"

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    [self download_tabelle];
    [tabella_tabelle_totali reloadData];
}

- (void) download_tabelle  {
    NSMutableString *databaseURL = [[NSMutableString alloc] initWithString:@"http://*********************.php"];
    //inizializzazione richiesta url
    NSURL *url = [NSURL URLWithString:databaseURL];
    //Richiesta asincrona per richiedere dati
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *tabelle, NSError *error)
     {
         [self tabelle_ricevute:tabelle];
     }
     ];

}

- (void)tabelle_ricevute:(NSData *)tabelle
{

    NSString *response = [[NSString alloc] initWithData:tabelle encoding:NSUTF8StringEncoding];
    NSArray *tmpResp = [response componentsSeparatedByString:@"####"]; //This array splits the response string
    NSLog(@"%@",response);
    //Aggiungo le mie tabelle al mio array
    [tabelle_totali addObjectsFromArray:tmpResp];

}

- (IBAction)refresh_tablelle:(id)sender {

    //Cancello vecchi dati
    while([[tabella_tabelle_totali tableColumns] count] > 0) {
        [tabella_tabelle_totali removeTableColumn:[[tabella_tabelle_totali tableColumns] lastObject]];
    }

    NSTableColumn *column = [[NSTableColumn alloc] initWithIdentifier:@"1"];
    [column setWidth:143];
    [[column headerCell] setStringValue:@"*******"];
    [tabella_tabelle_totali addTableColumn:column];
    [tabella_tabelle_totali reloadData];
}


-(NSInteger)numberOfRowsInTableView:(NSTableView *)aTableView {
    return 5;
}
-(id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {

    return @"hello world";
}










@end

Sorry lot of code is written in italian, but the issue is "international".. Why do i get this error ? The table dataSource is connected to the File's owner and the outlets as well.. When running the app instead of displaying 5 rows with 5 "hello world", obviously nothing happens.. Help

Upvotes: 2

Views: 1676

Answers (2)

rsfinn
rsfinn

Reputation: 1083

When using Swift, the issue may be that the data source class has not explicitly implemented the NSTableViewDataSource protocol. In particular, with the API renaming in Swift 3, it appears to be the protocol that causes the mapping of the Swift 3 syntax tableView(_:objectValueFor:row:) to the Objective-C selector tableView:objectValueForTableColumn:row:.

I discovered this when implementing a table view data source; although I had implemented the correct methods in Swift, I got the *** Illegal NSTableView data source message at runtime. I was confused until I realized I had forgotten to include the protocol conformance in my class declaration.

Upvotes: 0

Extra Savoir-Faire
Extra Savoir-Faire

Reputation: 6036

The problem may be in your xib file containing your table view. Have you set the table view's delegate to the File's Owner (which would be an instance of NSApplication), or have you set its delegate to your application delegate? It needs to be set to your application delegate.

If you haven't set up an object (visible in the margin to the left of your UI layout) representing your application delegate, you should do so, and connect your table view's delgate connection to that.

Upvotes: 3

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