Try clearing your table view's data source and delegate before releasing their
object. It appears the pointer gets reassigned to an NSRectSet before your
table view completely goes away but after its delegate and data source have.
--
Gary L. Wade (Sent from my iPad)
http://www.garywade.com/
> On Aug 26, 2016, at 8:15 AM, Andreas Falkenhahn <andr...@falkenhahn.com>
> wrote:
>
> Does anybody have an idea why the following code causes a "Segmentation
> fault" and thus
> an immediate program termination? Interestingly, the code runs just fine and
> the
> NSTableView appears correctly and is functional. The "Segmentation fault"
> occurs when
> buttonPressed() is left and control returns to the main run loop. Thus, I
> suspect that
> the error is probably related to autoreleasing, e.g. releasing a resource
> twice or
> something. But I don't really see anything that's wrong with my code.
> Sometimes I also
> get this message instead of the segmentation fault:
>
> [NSRectSet tableView:objectValueForTableColumn:row:]:unrecognized
> selector sent to instance 0x100153060
>
> But most of the time it just crashes with a segmentation fault. The code
> itself is
> really simple and straightforward, here it is:
>
> - (void)buttonPressed
> {
> NSRect rect = NSMakeRect(100, 100, 320 + 2 * 20, 78 + 200 + 20);
>
> NSWindow *win = [[NSWindow alloc] initWithContentRect:rect
> styleMask:NSTitledWindowMask backing:NSBackingStoreBuffered defer:NO];
>
> id listDelegate = [[MyListDelegate alloc] init];
>
> NSScrollView *scrollview = [[NSScrollView alloc]
> initWithFrame:NSMakeRect(20, 52, rect.size.width - 2 * 20, 200)];
> NSTableView *tableview = [[NSTableView alloc] initWithFrame:NSMakeRect(0,
> 0, rect.size.width - 2 * 20 - 16, 200)];
> NSTableColumn *column = [[NSTableColumn alloc]
> initWithIdentifier:@"Column"];
>
> [tableview addTableColumn:column];
> [tableview setDelegate:listDelegate];
> [tableview setDataSource:listDelegate];
> [scrollview setDocumentView:tableview];
> [[win contentView] addSubview:scrollview];
> [scrollview release];
> [tableview release];
> [column release];
>
> id buttonDelegateOK = [[MyButtonDelegate alloc] init];
> NSButton *ok = [[NSButton alloc] initWithFrame:NSMakeRect(rect.size.width
> - 82 - 14, 12, 82, 32)];
> [ok setTitle:@"OK"];
> [ok setButtonType:NSMomentaryPushInButton];
> [ok setBezelStyle:NSRoundedBezelStyle];
> [ok setKeyEquivalent:@"\r"];
> [ok setTarget:buttonDelegateOK];
> [ok setAction:@selector(buttonPressed)];
> [[win contentView] addSubview:ok];
> [ok release];
>
> [NSApp runModalForWindow:win];
>
> [win orderOut:nil];
> [win release];
>
> [listDelegate release];
> [buttonDelegateOK release];
> }
>
> -----------------------------------------------------------------------------------------------
>
> The list delegate is also minimal and looks like this:
>
> @interface MyListDelegate : NSObject
> @end
>
> @implementation MyListDelegate
> - (int)numberOfRowsInTableView:(NSTableView *)_tableView
> {
> return 3;
> }
>
> - (id)tableView:(NSTableView *)_tableView
> objectValueForTableColumn:(NSTableColumn *) tableColumn row:(int)row
> {
> return @"Foobar";
> }
> @end
>
> -----------------------------------------------------------------------------------------------
>
> I've already spent several hours trying to find out why this particular code
> results
> in a "Segmentation fault" but I just don't see it.
>
> Can anybody help? Thanks in advance!
>
> Full minimal demo program is attached for reference.
>
> --
> Best regards,
> Andreas Falkenhahn mailto:andr...@falkenhahn.com
> <main.m>
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