objective-c-category

I believe a popular way to declare "private methods" in Objective-C is to create its class extension and declare methods that you would like to make as private. I would like to know more in detail on how an class extension makes the methods work as private. Update: I asked this question with the term empty category which is incorrect. I now changed it as class extension That's not an "empty category", it's a class extension . Read Bbum's explanation of them at the link I provided. That's because you create your empty category in your implementation file, not your header file so other classes

Here is a situation: Hockeyapp and testflight every now and then complain about me "attempting to insert nil object" in mutable dictionaries/arrays. I know the right thing is to check for nil all the time, and I do when it makes sense.. Our testers can not catch those crashes, but AppStore users obviously can. My guess is that sometimes server returns NSNulls when it should not. So not to insert checks for nil everywhere in the huge project my idea was to create a separate target for the testers and use method swizzling for collection classes. Say, I'll replace insertObject:atIndex with my

There are two situations, that I am aware of, that cause the following errors: ld: warning: instance method 'resetAudioSystem' in category from /opentok-ios-sdk/Opentok.framework/Opentok(OTPublisher+AudioSnoop.o) conflicts with same method from another category ld: warning: instance method 'attachAudioSnoopBlock:' in category from /opentok-ios-sdk/Opentok.framework/Opentok(OTPublisher+AudioSnoop.o) conflicts with same method from another category ld: warning: instance method 'setVideoSnoopDelegate:' in category from /opentok-ios-sdk/Opentok.framework/Opentok(OTPublisher+VideoSnoop.o) conflicts

I have installed AFNetworking 2.1.0 with CocoaPods on Xcode 5. //ViewController.h #import <AFNetworking/AFNetworking.h> #import <AFNetworking/UIImageView+AFNetworking.h> Calling setImageWithURLRequest on an UIImageview the application fail with this log: This is the error log: 2014-02-07 11:55:19.984 OPS[1717:60b] *** Terminating app due to uncaught exception'NSInvalidArgumentException', reason: '-[UIImageViewsetImageWithURLRequest:placeholderImage:success:failure:]: unrecognized selector sent to instance 0x147b06d0' I've found some discussion on this issue, but the provided solution (adding

I know about the possibility of declaring private properties on a class by putting them inside an unnamed category on that class declared in the implementation ( .m ) file of that class. That's not what I want to do. I'm dealing with a named category on a class that adds some functionality to that class. For this functionality, it would help me very much to have a private property to use in my category - so the usual way of achieving this (described above) doesn't seem to work for me. Or does it? Please enlighten me! Inside your category's implementation file, declare another category and call