Re: NSToolbar Problem
Re: NSToolbar Problem
- Subject: Re: NSToolbar Problem
- From: Shaun Wexler <email@hidden>
- Date: Fri, 1 Apr 2005 10:06:31 -0800
On Apr 1, 2005, at 9:52 AM, Julian Cain wrote:
Well, the thing is in my custom cell I am doing all this...
_imageLeft = [[[NSImage imageNamed:@"TB_Segment_LeftCap"] setFlipped:YES] retain];
Please RTFM, and you'll see that the -setFlipped: method does not return an object. You're retaining nothing, and thus your ivars are undefined. If you really want to stack all that gack into one line, you'd have to do something ugly like:
[(_imageLeft = [[NSImage imageNamed:@"TB_Segment_LeftCap"] retain]) setFlipped:YES];
[(_imageRight = [[NSImage imageNamed:@"TB_Segment_RightCap"] retain]) setFlipped:YES];
It's better to create your objects, retain them, and cache the pointer. Then you can send them messages:
// create all of my static images
_imageLeft = [[NSImage imageNamed:@"TB_Segment_LeftCap"] retain];
_imageRight = [[NSImage imageNamed:@"TB_Segment_RightCap"] retain];
...
// flip all images
[_imageLeft setFlipped:YES];
[_imageRight setFlipped:YES];
...
It's easier to read the code when blocks of identical messages are grouped together, and it's more cache-friendly.
--
Shaun Wexler
MacFOH
http://www.macfoh.com
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