iphone, pass an array between classes?

Question

I want pass an array from Class A to Class B, but A calls B.

Answer 1

What you want are simple object members to set. The best way to achive this is to use properties: http://developer.apple.com/library/ios/#referencelibrary/GettingStarted/Learning_Objective-C_A_Primer/_index.html#//apple_ref/doc/uid/TP40007594

in B.h:

@property(nonatomic,retain) NSArray * theArray_B;

in B.m:

@synthesize theArray_B;

in A.m:

myB_Instance.theArray_B = theArrayToPass;

In that example A and B share a pointer to the same Array-Object in Memory. Moreover B owns this Array (what A also does) as it has a retain on it.

Answer 2

Something like this:

Class A contains:

- (void)someMethodInClassA {
    NSArray *arrayData = // ... stuff

    ClassB *classB = // ... stuff

    [classB aMethod:arrayData];

}

Class B contains:

- (void)aMethod:(NSArray *)array {
    // do something with the array
}

Google for objective c tutorials. You'll find things like http://howtomakeiphoneapps.com/objective-c-tutorial/

Answer 3

use this.

make array in class a and make it propertyand synthesize it in .m file. then push to next view and then use the pick object from navigation stack for accesing array.see this.

 FirstView *obj=(FirstView *)[self.navigationController.viewControllers objectAtIndex: [self.navigationController.viewControllers count]-2];

 //obj.array is the array which you want to use.