Cocoa Singleton conventions

Posted by MikeyWard on Stack Overflow See other posts from Stack Overflow or by MikeyWard
Published on 2010-05-25T14:38:38Z Indexed on 2010/05/25 14:41 UTC
Read the original article Hit count: 177

Filed under:

cocoa

|

singleton

Cocoa is full of singletons. Is there a logical/conventional difference between when the Cocoa APIs use

NSSingletonObject *so = [NSSingletonObject defaultSingleton];

versus

NSSingletonObject *so = [NSSingletonObject sharedSingleton];

?

Not a huge thing, but I don't really see why sometimes one is used versus the other.

© Stack Overflow or respective owner

Related posts about cocoa

MVC - Cocoa interface - Cocoa Design pattern book

as seen on Stack Overflow - Search for 'Stack Overflow'
So I started reading this book: http://www.amazon.com/Cocoa-Design-Patterns-Erik-Buck/dp/0321535022 On chapter 2 it explains about the MVC design pattern and gives and example which I need some clarification to. The simple example shows a view with the following fields: hourlyRate, WorkHours, Standarthours… >>> More
Drag String data from My Cocoa App to Third-Party Cocoa App

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I want to drag a row from my tableview and drop it into any other NSTextField in Mac OS X 10.6, and have a string of text be dropped. Drag and drop already works within my app (between a NSTableView and an NSBrowser), but I have had no success putting any data on the pasteboard that can… >>> More
Cocoa equivalent of the Carbon method getPtrSize

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to translate the a carbon method into cocoa into and I am having trouble finding any documentation about what the carbon method getPtrSize really does. From the code I am translating it seems that it returns the byte representation of an image but that doesn't really match up with the name… >>> More
String formatting in cocoa

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I am trying to send some text in an email from my cocoa app (by using Mail.app). Initially I tried using HTML to send properly formatted text. But the mailto: URL does not support html tags (even after setting headers) So I decided to use formatted string (left-aligning of string) This is what… >>> More
Anyone know the state of cocoa#?

as seen on Stack Overflow - Search for 'Stack Overflow'
Having just updated Mono to 2.6.3 (on OS X), I noticed in the installer that cocoa# 0.9.5 is also installed. However using MonoDevelop there are no cocoa# project templates by default, and I was wondering if anyone knew more about creating cocoa# apps. If you goto the cocoa# page on the Mono site… >>> More

Related posts about singleton

Singleton design pattern vs Singleton beans in Spring container

as seen on Stack Overflow - Search for 'Stack Overflow'
As we all know we have beans as singleton by default in Spring container and if we have a web application based on Spring framework then in that case do we really need to implement Singleton design pattern to hold global data rather than just creating a bean through spring. Please bear with me if… >>> More
Java Singleton Pattern

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm used the Singleton Design Pattern public class Singleton { private static final Singleton INSTANCE = new Singleton(); // Private constructor prevents instantiation from other classes private Singleton() {} public static Singleton getInstance() { return INSTANCE; } } My… >>> More
Static vs Singleton in C# (Difference between Singleton and Static)

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Recently I have came across a question what is the difference between Static and Singleton classes. So I thought it will be a good idea to share blog post about it.Difference between Static and Singleton classes:A singleton classes allowed to create a only single instance or particular class. That… >>> More
Difference between Singleton implemention using pointer and using static object

as seen on Stack Overflow - Search for 'Stack Overflow'
EDIT: Sorry my question was not clear, why do books/articles prefer implementation#1 over implementation#2? What is the actual advantage of using pointer in implementation of Singleton class vs using a static object? Why do most books prefer this class Singleton { private: static Singleton… >>> More
Trying to change variables in a singleton using a method

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to use a singleton to store variables that will be used across multiple view controllers. I need to be able to get the variables and also set them. How do I call a method in a singleton to change the variables stored in the singleton. total+=1079; [var setTotal:total]; where var is… >>> More