Re: Question about memory management

[David Chisnall]

On 7 Jun 2013, at 09:42, Maxthon Chan <address@hidden> wrote:

> Well can I (just like NSApplication):
> 
> 1) In supercalss, define the shared instance as id
> 2) In superclass, return the shared instance as id or instancetype
> 3) In superclass, DO NOT set up yet.
> 4) In superclass, set up in the method asking for the shared instance, which 
> always use [[self alloc] init]?

NSApplication is an example of a singleton designed for subclassing.  It 
provides an explicit mechanism for defining the subclass that should be used 
for the singleton instance: a string in the Info.plist providing the name of 
the application class to use.  It also sets up its delegate in this way and 
gets the name of the nib to load on application start.

David

-- Sent from my brain