On Aug 15, 2011, at 10:50 AM, David Duncan wrote:
> On Aug 15, 2011, at 10:47 AM, Kyle Sluder wrote:
>> On Mon, Aug 15, 2011 at 10:45 AM, David Duncan <david.dun...@apple.com>
>> wrote:
>>> In either case, the best general way to determine availability of
>>> weak-linked implementations is to test for them directly rather than using
>>> a system version check (like gestalt). If your using Clang (which I suspect
>>> you are not given your error) you could just use:
>>>
>>> "if ([NSPopover class]) { /* do stuff with popovers */ } else { /* do stuff
>>> without */ }"
>>
>> Is it the case that this check will only work on 10.6.8 or newer, and
>> that one should fall back on NSClassFromString() if supporting an
>> older version of Snow Leopard?
>
> I'd actually forgotten that this required 10.6.8. If you can require 10.6.8,
> I would use the new style universally. If you cannot I would use the
> NSClassFromString style until you can.
There's a bug here. The Objective-C runtime on 10.6.8 supports weak-linked
classes, but the NS_CLASS_AVAILABLE macro does not know that.
You can fix this if you are willing to hack your SDK headers. In
Foundation/NSObjCRuntime.h, find the macro definition of NS_CLASS_AVAILABLE,
and remove the check for __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_7.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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