reload problem

[Rounak]

#import <Cocoa/Cocoa.h>
@interface Controller: NSObject {
int theInt;
NSTableView *tableView;
}
@property(readwrite, assign) int theInt;

• (IBAction) changetheInt: (id) sender ;
  @end

#import <Foundation/Foundation.h>
#import “Controller.h”
@implementation Controller
@synthesize theInt;

• (id)init
  {
  [super init];
  [self setValue:[NSNumber numberWithInt:5]
  forKey:@“theInt”];

  NSNumber *n = [self valueForKey:@“theInt”];
  NSLog(@“theInt = %@”, n);
  return self;
  }

• (IBAction) changetheInt: (id) sender {

  [self willChangeValueForKey: @“theInt”];
  theInt++;
  NSLog(@“theInt is now %d”, theInt);

  [self didChangeValueForKey: @“theInt”];

  [tableView reloadData];
  }

• (int)numberOfRowsInTableView:(NSTableView *)aTableView {
  return 1;
  }

• (id)tableView:(NSTableView *) tv
  objectValueForTableColumn:(NSTableColumn *)tableColumn
  row:(int)row
  {
  return [self valueForKey: @“theInt”] ;

}
@end

IB Elements:
One tableView
One button

IB Connections:
table View x Controller delegate:
table View x Controller datasource:
Button x Controller changetheInt:

Problem:
When button is pressed, the value of theInt changes as I observe it in Console but it does not change in tableView.
Only when I click on the row of tableView, the value is updated. As you can see above i am already using tableView reloadData.
Thanks.

[ief2]

If you subclass a class, even if it is NSObject, you have to assign self to the super-call, not just call [super init], this will generate a memory leak.

@Init

• (id)init
  {
  self = [super init];
  [self setValue:[NSNumber numberWithInt:5]
  forKey:@“theInt”];

  NSNumber *n = [self valueForKey:@“theInt”];
  NSLog(@“theInt = %@”, n);
  return self;
  }

I also don’t understand why you are using setValue:ForKey:. Isn’t it easier to just use the instance variable?

#import <Cocoa/Cocoa.h>
@interface Controller: NSObject {
int theInt;
IBOutlet NSTableView *tableView;
}
@property(readwrite, assign) int theInt;

• (IBAction)changetheInt:(id)sender;
  @end

#import “Controller.h”
@implementation Controller
@synthesize theInt;

• (id)init {
  self = [super init];
  if(self != nil) {
  theInt = 5;
  NSLog(@“theInt = %d”, theInt);
  }

  return self;
  }

• (IBAction)changetheInt:(id)sender {
  NSLog(@“theInt is now %d”, ++theInt);
  [tableView reloadData];
  }

• (int)numberOfRowsInTableView:(NSTableView *)aTableView {
  return 1;
  }

• (id)tableView:(NSTableView *)tv objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)row {
  return [NSString stringWithFormat:@“%d”, theInt];
  }
  @end

Hope it helps,
ief2

[Rounak]

Thanks for the suggestions.
However, it does not solve the problem. There is no change in the result.

[Shane_Stanley]

Try calling needsDisplay.

[Rounak]

• (IBAction)changetheInt:(id)sender {
  NSLog(@“theInt is now %d”, ++theInt);
  [tableView reloadData];
  [tableView setNeedsDisplay: YES];

}

fails.
only binding works as desired.

[Shane_Stanley]

I’m not sure you should be changing the ivar directly, but if you do, you’ll have to include willChangeValueForKey and didChangeValueForKey.

[ief2]

Are you sure you’ve set the data source and IBOutlet thru IB? The code in this project works fine for me:

http://www.mediafire.com/?56ma4y1347s41e0

Hope it helps,
ief2

[Rounak]

Sorry for the delay in replying.

table View x Controller delegate:
table View x Controller datasource:
Button x Controller changetheInt:

I had mentioned the above connections in my first post.

Instead of
table View x Controller delegate:
the connection
table View x Controller
was required.

Thanks for the help.