Question

所以在我的cocos2d-iphone游戏中，我有一个动作层 - 所有的魔法都发生了，然后我为我的敌人精灵和我的主要主角精灵上课。

在我的动作层中，我在init上添加了精灵帧，但这感觉它应该被封装到它们所属的类而不是它们所在的层中，但是我不想多次添加它们

如何在使用类时将帧添加到spriteFrameCache中？如果我将以下代码放在我的init方法中用于外星精灵，它会让我的游戏陷入困境吗？

    // Add Alien Hominid to sprite cache
    [[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:@"AlienHominid-ipadhd.plist"];
    alienSheet = [CCSpriteBatchNode batchNodeWithFile:@"AlienHominid-ipadhd.png"];
    [self addChild:alienSheet];
    alienFrames = [NSMutableArray array];
    for (int i=1; i <= 5; i++) {
        [alienFrames addObject:
         [[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:
          [NSString stringWithFormat:@"AlienHominid %d.png", i]]];
        if (i==5)
            [alienFrames addObject:
             [[CCSpriteFrameCache sharedSpriteFrameCache]spriteFrameByName:@"AlienHominid 1.png"]];
    }
    alienAnim = [CCAnimation animationWithSpriteFrames:alienFrames delay:0.1];
    flip = [[CCRepeatForever alloc ] initWithAction:[CCAnimate actionWithAnimation:alienAnim ]];

现在感觉就像语义自杀一样，有没有办法来封装这种行为？

Answer 1

你绝对应该将CCSprite子类化。

我们称之为alienHominid类，在您的头文件中，该类应该如下所示：

@interface alienHominid : CCSprite {
    //helps you find which current frame is being displayed at any moment
    int currentFrame;
    CCAnimation *flip;
}

//Extra some extra params you might need ?
@property (readwrite) NSNumber *health;

//And your new init method
-(id)initWithSpriteSheet:(NSString*)aSpriteFrame andBatchNode:(NSString*)aBatchNode;

//Some other methods to animate and give it your required behaviours
-(void)startAnimations;
-(void)prepareAnimations;
-(void)stopAnimations;
-(void)removeFromLayer;
@end

现在让我们看一下您的实施文件

@implementation alienHominid

//Synth. properties you created here , if any.
@synthesize health  = _health;

-(id)initWithSpriteSheet:(NSString*)aSpriteFrame andBatchNode:(NSString*)aBatchNode
{

    self = [super init];
    if(self)
    {
        //custom init code
        [self setHealth:[NSNumber numberWithInt:100]];
        //
        [[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:aSpriteFrame];
        alienSheet = [CCSpriteBatchNode batchNodeWithFile:aBatchNode];
    }

    return self;
}

//Some other methods to animate and give it your required behaviours

-(void)prepareAnimations{
    alienFrames = [NSMutableArray array];
    for (int i=1; i <= 5; i++) {
        [alienFrames addObject:
        [[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName: [NSString stringWithFormat:@"AlienHominid %d.png", i]]];
        if (i==5)
            [alienFrames addObject:[[CCSpriteFrameCache sharedSpriteFrameCache]spriteFrameByName:@"AlienHominid 1.png"]];
    }
    CCAnimation *alienAnim = [CCAnimation animationWithSpriteFrames:alienFrames delay:0.1];
    flip = [[CCRepeatForever alloc ] initWithAction:[CCAnimate actionWithAnimation:alienAnim]];
}
-(void)startAnimations{
    [flip start];
}
-(void)stopAnimations{
    //Stop animations here
    [flip stop];
}
-(void)removeFromLayer{
    //If alien dies, remove it here
}
@end

现在，您可以通过导入标题

轻松地在任何场景中使用它

 #import "alienHominid.h"

并像这样添加：

alienHominid *alien = [[alienHominid alloc] initWithSpriteSheet:@"AlienHominid-ipadhd.plist" andBatchNode:@"AlienHominid-ipadhd.png"];
[alien prepareAnimations];
[alien startAnimations];
[self addChild:alien];

注意此代码未经过测试，只是将我想到的内容写入浏览器，所以期望它不起作用，但它应该让您简单了解我和＃ 39; m试图沟通:)，即使它有效，也将其视为伪代码;）

干杯！

如何在一个类中封装Cocos2d Sprite Frame？

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