愚かな質問。Cocos2dは、親子階層を中心に構築されています。親クラス(例:GameScene)を持ち、親クラスのメンバー(例:CCSpriteBatchNode *)へのポインターで子クラス(例:SpriteHandler)を初期化しても大丈夫かどうか疑問に思いました。
CCSpriteBatchNodesの数を最適化するためにこれを実行しようとしています。これが私のメインクラス(GameSceneスタイル)のコードスニペットです。
#import <Foundation/Foundation.h>
#import "cocos2d.h"
enum ShooterSceneLayerTags {
HudLayerTag = 0,
};
@interface ShooterScene : CCLayer {
CCSpriteBatchNode* sharedSpriteBatchNode;
}
-(id) initWithSharedBatchNodeReference:( CCSpriteBatchNode*) sharedSpriteBatchNode;
+ (id) sceneWithId:(int)sceneId;
@end
#import "ShooterScene.h"
#import "MainMenuScene.h"
//Layers
#import "LevelSpritesLayer.h"
#import "HudLayer.h"
@interface ShooterScene (PrivateMethods)
-(void) addLayers:(int)sceneId;
-(void) loadGameArtFile;
-(BOOL) verifyAndHandlePause;
@end
@implementation ShooterScene
+ (id) sceneWithId:(int)sceneId
{
CCScene *scene = [CCScene node];
ShooterScene * shooterLayer = [[self alloc] initWithId:sceneId];
[scene addChild:shooterLayer];
return scene;
}
-(id) initWithId:(int)sceneId
{
if ((self = [super init]))
{
//Load game art before adding layers - This will initialize the batch node
[self loadGameArtFile:sceneId];
//Will add sprites to shared batch node for performance
[self addLayers:sceneId];
[self addChild:sharedSpriteBatchNode];
//Do other stuff..
[self scheduleUpdate];
}
return self;
}
-(void) addLayers:(int)sceneId
{
LevelSpritesLayer * levelData = [LevelSpritesLayer node];
[levelData initWithSharedBatchNodeReference:sharedSpriteBatchNode];
[self addChild:levelData];
switch (sceneId) {
case 1:
[levelData loadLevelOneSprites];
break;
case 2:
[levelData loadLevelTwoSprites];
break;
default:
break;
}
HudLayer * hud = [HudLayer node];
[hud setUpPauseMenu];
[self addChild:hud z:1 tag:HudLayerTag];
}
-(BOOL) verifyAndHandlePause
{
HudLayer * hud = [self getChildByTag:HudLayerTag];
if(hud.pauseRequested){
[[CCDirector sharedDirector] replaceScene:[MainMenuScene scene]];
return true;
}
else {
return false;
}
}
-(void) update:(ccTime)delta
{
if([self verifyAndHandlePause]==false)
{
//Continue with animation etc..
}
}
/**
This is tricky. Could have loaded this in LevelData but as I am expecting to use the same SpriteSheet for HudLayer as well then
I prefer to have the control here of this. Also, the same sheet could be used for more level, hence specific function is not bad
**/
-(void) loadGameArtFile:(int) sceneId
{
CCSpriteFrameCache* frameCache = [CCSpriteFrameCache sharedSpriteFrameCache];
[frameCache addSpriteFramesWithFile:@"game-art-hd.plist"];
sharedSpriteBatchNode = [CCSpriteBatchNode batchNodeWithFile:@"game-art-hd.png"];
}
//As dealloc is deprecated, I prefer to remove unused sprites and texture on cleanup
-(void) cleanup
{
[[CCSpriteFrameCache sharedSpriteFrameCache] removeUnusedSpriteFrames];
}
これがloadLevelDataメソッドの1つで、sharedSpriteBAtchNodeReferenceを使用します。
-(void) loadLevelOneSprites
{
//Just a proof of concept example
testSprite = [CCSprite spriteWithSpriteFrameName:@"File0.png"];
testSprite.anchorPoint = CGPointMake(0.5f, 0.5f);
testSprite.position = CGPointMake(160.0f, 240.0f);
[sharedSpriteBatchNodeReference addChild:testSprite];
}