Question

Is it possible to access b2Fixture and b2Body properties in one class in another class in such a way that joints could be created. If yes, how can it be done. Please Help

Answer 1

Create property to get access to your b2Body object. Then you can get list of b2Fixtures for this b2Body.

in your .h file

@interface MyClass
{
    b2Body* m_body;
}

@property (nonatomic, readonly) b2Body* body;

@end

in your .mm file (you must use .mm extension to be able to use c++ classes and methods)

@implementation MyClass

@synthesize body = m_body;

- (id) init
{
    self = [super init];

    if( self != nil )
    {
        // create your b2Body here and 
    }

    return self;
}

@end

After this all MyClass instances will have property body, that can be accessed as

myClassInstance.body

or

[myClassInstance body];