Background - in my iPhone app I have a custom UITableViewController - I was going to pass some required config to it by extending the existing "(id)initWithStyle:(UITableViewStyle)style" method to an extended custom one.
Question - what's the best way to ensure that the user of this custom controller class can only call my custom init method, and not initWithStyle or any other init methods?
You can override the init methods that you don't want to be used, and raise an exception there.
You can also override them and make them initialize with the designated initializer.
Also, you should specify it on your documentation.
I usually document this and put a [self doesNotRecognizeSelector:_cmd] call into the init methods that are not intended to be used.
In conjunction, marking the method deprecated (see How do I flag a function as being deprecated in an iPhone Objective C header file?) prevents runtime suprises and gets you a warning at compile time.
来源：https://stackoverflow.com/questions/6646440/how-to-prevent-usage-of-other-init-methods-other-than-my-custom-method-in-object