Question

我正在尝试子类化CCSprite但由于某种原因我似乎无法在屏幕上绘制任何内容。我不是cocos2d的专家，所以我愿意接受任何建议。这是我的代码。我有一个这样的场景：

#import "cocos2d.h"

@class Animation;

@interface HelloWorldLayer : CCLayer
{

}

+(CCScene *) scene;

@end

#import "HelloWorldLayer.h"
#import "Animation.h"
@implementation HelloWorldLayer

+(CCScene *) scene
{
    CCScene *scene = [CCScene node];
    HelloWorldLayer *layer = [HelloWorldLayer node];
    [scene addChild: layer];
    return scene;
}


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

        CCLOG(@"super init");

        HelloWorldLayer *animation;
        animation = [Animation animation:self];

 }
    return self;
}

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

然后我像这样继承CCSprite：

#import <Foundation/Foundation.h>
#import "cocos2d.h"
@class HelloWorldLayer;

@interface Animation : CCSprite {

    HelloWorldLayer     *ivHelloWorld;
}
+ (id) animation:(HelloWorldLayer*) helloWorld;
- (id) initAnimation: (HelloWorldLayer*) helloWorld;
@end

#import "Animation.h"
#import "HelloWorldLayer.h"


@implementation Animation

+ (id) animation:(HelloWorldLayer *) helloWorld{
    CCLOG(@"animation method");
    return [[[self alloc] initAnimation:helloWorld] autorelease];

}

- (id) initAnimation:(HelloWorldLayer *)helloworld {


     CCLOG(@"InitaAnimation method");
    // cache
    CCSpriteFrameCache *cache=[CCSpriteFrameCache sharedSpriteFrameCache];
    [cache addSpriteFramesWithFile:@"FootballAtlas.plist"];

    // frame array
    NSMutableArray *framesArray=[NSMutableArray array];
    for (int i=1; i<60; i++) {
        NSString *frameName=[NSString stringWithFormat:@"Football%d.png", i];
        id frameObject=[cache spriteFrameByName:frameName];
        [framesArray addObject:frameObject];
    }
    CCLOG(@" array count = %i", [framesArray count]);
    // animation object
    id animObject=[CCAnimation animationWithFrames:framesArray delay:0.01];

    // animation action
    id animAction=[CCAnimate actionWithAnimation:animObject restoreOriginalFrame:NO];
    CCRepeatForever *repeat = [CCRepeatForever actionWithAction:animAction];

    id animAction2=[CCAnimate actionWithAnimation:animObject restoreOriginalFrame:NO];
    animAction2=[CCRepeatForever actionWithAction:animAction2];

    // sprite
    CCSprite *bird=[CCSprite spriteWithSpriteFrameName:@"Football0.png"];
    bird.position=ccp(60,160);

    CCSprite *bird2=[CCSprite spriteWithSpriteFrameName:@"Football0.png"];
    bird2.position=ccp(80,160);


    // batchNode
    CCSpriteBatchNode *batchNode=[CCSpriteBatchNode batchNodeWithFile:@"FootballAtlas.png"];
    [self addChild:batchNode];
    [batchNode addChild:bird];
    [batchNode addChild:bird2];

    [bird runAction:repeat];
    [bird2 runAction:animAction2];

    return self;
}
@end

这不会在屏幕上绘制任何内容，但如果我将动画代码移动到CClayer，那么一切都显示正常。我做错了什么？

Answer 1

你忘了初始化你的动画精灵：

- (id) initAnimation:(HelloWorldLayer *)helloworld {
   if ((self = [super init]))
   {
      // PUT YOUR CODE HERE
   }
   return self;
}

请注意您的HelloWorldLayer，因为您没有将动画添加为子项（并且未正确键入变量）。如果你想看到场景中的某些内容，请更改它。：）

Answer 2

我想通了，谢谢。我正在初始化一个HelloWorldLayer对象，我需要一个动画对象。

cocos2d子类化CCSprite

2 个答案: