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Accessing getter methods
#import "cocos2d.h"
#import "Box2D.h"
#import "GLES-Render.h"
#import <Foundation/Foundation.h>


@class UILayer;
@class Insect;

@interface GamePlayLayer : CCLayer {

b2World * world;
GLESDebugDraw * debugDraw;
CCSpriteBatchNode * sceneSpriteBatchNode;
Insect * insect;
b2Body *body;
SceneUILayer * uiLayer;
    double startTime;
bool gameOver;
bool gameWon;
NSMutableArray *lives;

}

- (id)initWithUILayer:(UILayer *)sceneUILayer;


@end

UILayer * sr = (UILayer *)[self.parent getChildByTag:10];
CCSprite * live = [sr.lives objectAtIndex:self.lives];
[live setVisible:NO];

@interface UILayer : CCLayer {

NSMutableArray *lives;

   }

 @property (nonatomic,retain) NSMutableArray *lives;

#import "UILayer.h"
#import "GameManager.h"


@implementation UILayer


@synthesize lives;

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


    lives = [[NSMutableArray arrayWithCapacity:3]retain];

    for(int i=0;i<3;i++)
    {
        CCSprite * life = [CCSprite spriteWithFile:@"life_Label.png"];
        [life setPosition:ccp(winSize.width/18+ 32*i,290)];
        [self addChild:life];
        [lives addObject:life];
    }
   }

@interface blah

// ...

@property (assign) NSInteger lives;

@end

@implementation blah

@synthesize lives = _lives;

//your code

@end