Re: Preserving undo actions on deleted targets
Re: Preserving undo actions on deleted targets
- Subject: Re: Preserving undo actions on deleted targets
- From: Quincey Morris <email@hidden>
- Date: Thu, 30 Jan 2014 16:59:17 -0800
On Jan 30, 2014, at 16:30 , Graham Cox <email@hidden> wrote:
> However, the documentation states:
>
> "If you override this method, you must call super or raise an NSInvalidArgumentException exception at the end of your implementation. In other words, this method must not return normally; it must always result in an exception being thrown."
Yeah, that wasn’t the right place to do it. The correct place sounds like ‘forwardInvocation:’, about which the documentation states:
> A forwardInvocation: method can act as a distribution center for unrecognized messages, parceling them out to different receivers. Or it can be a transfer station, sending all messages to the same destination. It can translate one message into another, or simply “swallow” some messages so there’s no response and no error. A forwardInvocation: method can also consolidate several messages into a single response. What forwardInvocation:does is up to the implementor. However, the opportunity it provides for linking objects in a forwarding chain opens up possibilities for program design.
Alternatively and more simply, it seems, you could return nil from ‘forwardingTargetForSelector:’.
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