hi.
I have a window with 3 comboboxes. one of them uses a data source. the problem
is that it keeps throwing an exception, and i can't find out why. I've put the
following methods in my appcontroller:
-(NSInteger)numberOfItemsInComboBox:(NSComboBox *)aComboBox {
return (NSInteger)[symbols count];
}
-(id)comboBox:(NSComboBox *)sender objectValueForItemAtIndex:(NSInteger)index {
return [symbols objectAtIndex:index];
}
symbols is an NSMutableArray which can contain any number of NSStrings (I
initialize it with 5 NSStrings)
when i try to launch the app from within xcode, the console shows the following:
2010-03-18 19:26:28.515 StoX[63999:a0f] An uncaught exception was raised
2010-03-18 19:26:28.534 StoX[63999:a0f] *** -[NSCFArray objectAtIndex:]: index
(-1 (or possibly larger)) beyond bounds (5)
2010-03-18 19:26:28.596 StoX[63999:a0f] *** Terminating app due to uncaught
exception 'NSRangeException', reason: '*** -[NSCFArray objectAtIndex:]: index
(-1 (or possibly larger)) beyond bounds (5)'
*** Call stack at first throw:
(
0 CoreFoundation 0x00007fff87ddb444
__exceptionPreprocess + 180
1 libobjc.A.dylib 0x00007fff800470f3
objc_exception_throw + 45
2 CoreFoundation 0x00007fff87ddb267
+[NSException raise:format:arguments:] + 103
3 CoreFoundation 0x00007fff87ddb1f4
+[NSException raise:format:] + 148
4 Foundation 0x00007fff8798e080
_NSArrayRaiseBoundException + 122
5 Foundation 0x00007fff878f0b81 -[NSCFArray
objectAtIndex:] + 75
6 AppKit 0x00007fff80ba2012
-[NSComboBoxCell selectItemAtIndex:] + 191
7 StoX 0x0000000100001693
-[AppController awakeFromNib] + 50
8 CoreFoundation 0x00007fff87d8a82d -[NSSet
makeObjectsPerformSelector:] + 205
9 AppKit 0x00007fff8086c913
-[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1445
10 AppKit 0x00007fff8086ab49 loadNib + 226
11 AppKit 0x00007fff8086a059
+[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 248
12 AppKit 0x00007fff80869e91
+[NSBundle(NSNibLoading) loadNibNamed:owner:] + 326
13 AppKit 0x00007fff80867413
NSApplicationMain + 279
14 StoX 0x00000001000015a8 start + 52
)
terminate called after throwing an instance of 'NSException'
i've checked that i'm using the types that the docs say i should be using, but
i don't understand why index comes back as -1.
am i doing something wrong? should I be doing something i'm not doing? is the
documentation wrong? is there a bug
somewhere?_______________________________________________
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