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iOS So about Singeltons and Global ivars.

L

larswik

macrumors 68000
Original poster
Sep 8, 2006
1,552
11
So until the other day I thought my objects instance variables were "Global Variables". My thinking was that if I had 2 or more Methods that needed to access the same variable, I would declare them "Globally" and instantiate them. If not I would declare them locally within the Method for temporary use. (like I learned in my Pascal class regarding the Scope or variables).

- Are object instance variables also know as global variables for that object? I seem to use them in that capacity and they function that way. But are they know as Global Variables too?

I have not learned how to use Singletons yet but I guess they store information "Globally" in my root controller which I can use to pass information to my different objects?

- Are there any good tutorials out there to learn how to use Singletons? I did google it but sometimes folks here have good resources too. This is my weekend project to learn.

Thanks!
 
X

xStep

macrumors 68020
Jan 28, 2003
2,031
143
Less lost in L.A.
larswik said:
So until the other day I thought my objects instance variables were "Global Variables". My thinking was that if I had 2 or more Methods that needed to access the same variable, I would declare them "Globally" and instantiate them. If not I would declare them locally within the Method for temporary use. (like I learned in my Pascal class regarding the Scope or variables).

- Are object instance variables also know as global variables for that object? I seem to use them in that capacity and they function that way. But are they know as Global Variables too?

I have not learned how to use Singletons yet but I guess they store information "Globally" in my root controller which I can use to pass information to my different objects?

- Are there any good tutorials out there to learn how to use Singletons? I did google it but sometimes folks here have good resources too. This is my weekend project to learn.

Thanks!
Click to expand...

Based on your question, Singletons, AppDelegates and top-level data looks like a good read.

For more put the following into Google: using singleton cocoa

Instance variables are global to an object, yes. It's that scope thing you mentioned.

Sometimes you'll find a variable defined above the @interface. Those variables are global but typically considered class variables.

For some more check out Objective-C Variable Scope and Storage Class.
 
L

larswik

macrumors 68000
Original poster
Sep 8, 2006
1,552
11
Cool, thanks for the links. I will read up on them.

So instance variables are also know as global variables, to that object. Thanks for the clarification.
 
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