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[irene_19891023]

Originally Posted by WaRcLaWz

Sure.

I created a blank foundation class called "Globals" that stores the variables.

Globals.h looks like this...

#import <Foundation/Foundation.h>

extern NSArray *gMapArray;
extern NSMutableArray *gPathHexArray;
extern NSMutableArray *gTerrainImageViewArray;


@interface Globals : NSObject {

}

@end

Globals.m looks like this...

#import "Globals.h"

@implementation Globals

NSArray *gMapArray;
NSMutableArray *gPathHexArray;
NSMutableArray *gTerrainImageViewArray;


@end

The external variables need to be initialized before they can be used, so I did this in the "AppDelegate.m" class...

- (void)applicationDidFinishLaunching:(UIApplication *)application {    
    
    // Override point for customization after app launch
    [window addSubview:mainMenuViewController.view];
    [window makeKeyAndVisible];

	//Initialize array that holds the terrain graphics
	gMapArray = [[NSArray alloc] init];
	//Initialize array that holds the movement hexes
	gPathHexArray = [[NSMutableArray alloc] init];
	//Initialize array that holds the terrain UIImageView objects
	gTerrainImageViewArray = [[NSMutableArray alloc] init];
}

You must make sure that you import the "Globals.h" into any class that uses the external variables, including the AppDelegate that I mentioned above. For example, in the "AppDelegate.m" you would make sure to have

#import "Globals.h"

I hope this helps!

Hello~I have known your method, but I still have a question that do i need to write "Global *global=[[Global alloc] init];" before i use those global variables? Thank you~!