Access variables in another class xcode

Question

//In class2.m File,

 HelloWorldLayer myHelloWorldLayer = [[HelloWorldLayer alloc]init];
 myHelloWorldLayer.myInt =100;
        NSLog(@"%i",myHelloWorldLayer.myInt);

//In HelloWorldLayer.h
int _myInt;
@property (nonatomic,readwrite) int myInt;


//In HelloWorldLayer.m
@synthesize myInt= _myInt;

NSLog(@"%i",self.myInt);

When i run HelloWorld Layer, output is 0. I changed scene to class2 file and changed myInt to 100 and the output is 100. But when i replace scene back to HelloWorldLayer output is 0 again instead of 100. Please help, thank you.

Could you be a bit more clear? Do you need to change the value of one instance of a class, or do you want that value to be the same for all instances of that class? — Richard J. Ross III
– Richard J. Ross III, Commented Dec 5, 2011 at 16:36
I understand that part. What I do not understand is if you want that to be for all layers you make of that type, or just one of those layers you make. — Richard J. Ross III
– Richard J. Ross III, Commented Dec 5, 2011 at 16:41
I want that to be for all layers i make of that type. Like all layers should read myInt as 100 now. — user1050548
– user1050548, Commented Dec 5, 2011 at 16:46

Richard J. Ross III · Accepted Answer · 2011-12-05 16:54:10Z

2

// in HelloWorldLayer.h
// these are static variables. 
// You would reference them like so: 
// HelloWorldLayerStatic.myInt = x;
static struct { 
   int myInt; 
} HelloWorldLayerStatic;

Then, when you would refer to self.myInt or myLayer.myInt, you would refer to HelloWorldLayerStatic.myInt. It's a little bit of a hack, but it works.

answered Dec 5, 2011 at 16:54

Richard J. Ross III

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3 Comments

user1050548 Over a year ago

May i know what is wrong with my code too? Thanks. I searched many answers and this method is supposed to work.

Richard J. Ross III Over a year ago

There was nothing wrong with your code, but when you use replaceScene with a new scene every time, you create a new instance of the scene, which thus replaces the instance variables, clearing myInt back to 0.

Richard J. Ross III Over a year ago

Also, please be sure to up vote and accept the answer if you can.

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