Re: iOS: Using AppDelegate as an app-wide singleton
Re: iOS: Using AppDelegate as an app-wide singleton
- Subject: Re: iOS: Using AppDelegate as an app-wide singleton
- From: Quincey Morris <email@hidden>
- Date: Tue, 01 Dec 2015 15:55:27 -0800
- Feedback-id: 167118m:167118agrif8a:167118soRIVe_FhK:SMTPCORP
On Dec 1, 2015, at 12:58 , Carl Hoefs <email@hidden> wrote:
> available to all classes via [[UIApplication sharedApplication] delegate].
> Are there any drawbacks to this?
I don’t find this practice very objectionable, but the drawback is that '[[UIApplication sharedApplication] delegate]’ has the wrong class, so you usually end up writing some sort of global function to get it pre-cast.
In that case, you may as well use a different object, make it a local static variable in a class implementation, and write a static method (“[MyContextCache sharedContextCache]”) to get it. Don’t forget to use dispatch_once to create the singleton. You may not have any thread safety concerns right now, but you might easily do so later.
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