Cocos2d项目中scene之间的数据传递

在数据传递过程中,我们创建一个delegate进行辅助:

helpDelegate.h文件

#import <Foundation/Foundation.h>

@protocol helpDelegate

- (void)passValue:(NSString*)value;

@end

helpDelegate.m里面都可以不用写内容

接下来我们看下需要进行数据传递的2个类:

第一个类:

HelloWorldLayer.h文件

#import "cocos2d.h"

#import "helpDelegate.h"

@interface HelloWorldLayer : CCLayer<helpDelegate> { }

+(CCScene *) scene;

@end

HelloWorldLayer.m文件

#import "HelloWorldLayer.h"

#import "SubLayer.h"

#import "cocos2d.h"

#import "CCTransition.h"

@implementation HelloWorldLayer

+(CCScene *) scene

{  

CCScene *scene = [CCScene node];

 HelloWorldLayer *layer = [HelloWorldLayer node];

 [scene addChild: layer];  

return scene;

}

-(id) init

{    

　　if( (self=[super init]))

　　{        

　　　　CGSize size = [[CCDirector sharedDirector] winSize];        

　　　　CCMenuItem *InsMn = [CCMenuItemFont itemFromString:@"Next" target:self selector:@selector(OnInstantAction:)];        

　　　　CCMenu *menus = [CCMenu menuWithItems:InsMn, nil];        

　　　　 [self addChild:menus];  

　　}  

　　return self;

}

- (void) OnInstantAction:(id) sender {        

　　CCScene *sc = [CCScene node];    

　　 SubLayer *subLayer = [SubLayer node];    

　　subLayer.delegate=self;    

　　 [sc addChild:subLayer];    

　　 [[CCDirector sharedDirector] replaceScene: [CCTransitionSlideInR transitionWithDuration:1.2f scene:sc]];

}

-(void)passValue:(NSString *)value {    

　　CGSize size = [[CCDirector sharedDirector] winSize];    

　　CCLabelTTF *label = [CCLabelTTF labelWithString:value fontName:@"Marker Felt" fontSize:64];    

　　label.position = ccp(size.width/2, size.height/2+30);    

　　[self addChild:label];   

}

- (void) dealloc {  [super dealloc]; }

@end

第二个类:

SubLayer.h文件

#import <Foundation/Foundation.h>

#import "cocos2d.h" #import "helpDelegate.h"

@interface SubLayer : CCLayer {     }

@property (nonatomic,retain) CCLayer<helpDelegate>* delegate;

@end

SubLayer.m文件

#import "SubLayer.h" #import "HelloWorldLayer.h"

@implementation SubLayer

@synthesize delegate;

+(CCScene *) scene {

 　　CCScene *scene = [CCScene node];

 　　SubLayer *layer = [SubLayer node];  

　　[scene addChild: layer];  return scene;

}

-(id) init {  

　　if( (self=[super init])) {     

　　 　　CCMenuItem *InsMn = [CCMenuItemFont itemFromString:@"Previous" target:self selector:@selector(OnInstantAction:)];        

　　　　 CCMenu *menus = [CCMenu menuWithItems:InsMn, nil];        

　　 　　[self addChild:menus];  

　　}

 　　return self;

}

- (void) OnInstantAction:(id) sender {    

　　 CCScene *sc = [CCScene node];    

　　 [delegate passValue:@"haha"]; //将字符串传递给HelloWorldLayer   

　　[sc addChild:delegate];    

　　[[CCDirector sharedDirector] replaceScene: [CCTransitionSlideInR transitionWithDuration:1.2f scene:sc]];

}

@end