> On May 10, 2016, at 5:04 PM, Quincey Morris > <quinceymor...@rivergatesoftware.com> wrote: > > On May 10, 2016, at 16:43 , Roland King <r...@rols.org > <mailto:r...@rols.org>> wrote: >> >> Well no he hasn’t > > Correct … no he hasn’t. I mis-edited a longer draft of the post. > >> Now that I've changed things over to use the context value, I get this at >> the moment I add an NSOperation to the NSOperationQueue: >> >> [uploadQueue addOperation:opn]; <-- Thread 1, EXC_BAD_ADDRESS (code=1, >> address=0xc) >> >> (lldb) po uploadQueue >> <NSOperationQueue: 0x17e76d20>{name = 'Upload Queue'} >> >> (lldb) po opn >> <NSInvocationOperation: 0x17de5890> >> >> (lldb) bt >> * thread #1: tid = 0x207807, 0x204e3a86 libobjc.A.dylib`objc_msgSend + 6, >> stop reason = EXC_BAD_ACCESS (code=1, address=0xc) >> frame #0: 0x204e3a86 libobjc.A.dylib`objc_msgSend + 6 >> frame #1: 0x2151e27e Foundation`-[NSObject(NSKeyValueObservingPrivate) >> _changeValueForKeys:count:maybeOldValuesDict:usingBlock:] + 278 >> frame #2: 0x214822d0 Foundation`-[NSObject(NSKeyValueObservingPrivate) >> _changeValueForKey:key:key:usingBlock:] + 68 > > It’s in the middle of handling a change notification. I’d suggest setting a > breakpoint at the top of your ‘observeValueForKeyPath:…’ method. >
Hmm, I think I may see what the problem is. I assumed -dismissViewControllerAnimated: would end up invoking -prepareForSegue: but it doesn't, so my -removeObserver: call never got invoked. So when transitioning to another ViewController, it would still KVO notify the original VC which was no longer being presented. Adding -removeObserver: to both places seems to have solved this. -Carl _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
