Re: self.myTextField.stringValue = @"" fails
Re: self.myTextField.stringValue = @"" fails
- Subject: Re: self.myTextField.stringValue = @"" fails
- From: Jens Alfke <email@hidden>
- Date: Tue, 08 May 2012 10:01:12 -0700
On May 8, 2012, at 9:15 AM, Antonio Nunes wrote:
> I have a text field that when I try to set it to a literal string fails:
> This is the code:
> self.myTextField.stringValue = @""; (It also fails if the literal string is not empty).
That is quite bizarre. So much so that I’m assuming that this isn’t the actual problem, that there’s a mixup about which line is raising the exception.
> This is the (partial) backtrace:
> 2012-05-08 18:09:28.516 MyApp[18775:507] *** Assertion failure in -[NSTextFieldCell _objectValue:forString:errorDescription:], /SourceCache/AppKit/AppKit-1138.32/AppKit.subproj/NSCell.m:1564
>
> Catchpoint 7 (exception thrown).2012-05-08 18:09:31.742 MyApp[18775:507] Invalid parameter not satisfying: aString != nil
> 2012-05-08 18:09:31.845 MyApp[18775:507] (
> 0 CoreFoundation 0x00007fff90d12fc6 __exceptionPreprocess + 198
> 1 libobjc.A.dylib 0x00007fff8c3f4d5e objc_exception_throw + 43
> 2 CoreFoundation 0x00007fff90d12dfa +[NSException raise:format:arguments:] + 106
> 3 Foundation 0x00007fff92db1743 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 169
> 4 AppKit 0x00007fff8a9495a5 -[NSCell _objectValue:forString:errorDescription:] + 160
> 5 AppKit 0x00007fff8a9494ff -[NSCell _objectValue:forString:] + 19
> 6 AppKit 0x00007fff8a949465 -[NSCell setStringValue:] + 41
> 7 AppKit 0x00007fff8aa4a5e8 -[NSControl setStringValue:] + 115
So, what’s line 8? Are you *certain* that it’s the line you quoted above, and not some other -setStringValue: call in your code?
If you set a breakpoint on the line in question, and then step over the call, does the exception trigger?
The only other explanation I can think of is that some previous bug in the code has messed up the predefined NSString instance that @“” points to. But that would be hard to do — IIRC, the compile-time-constant NSStrings are somewhat magical and don’t track refcounts, so you can’t over-release them.
—Jens
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