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我可以让 HUD 层出现，但我似乎无法更新它。我在 Ray 的教程中得到了它，但由于某种原因，我无法在我自己的应用程序中得到它。我做了一个新的 Cocos2d 项目，这样我就可以尝试隔离问题，我也遇到了同样的问题……也许你们可以帮忙。（我没有收到任何错误，并尝试尽我所能为 StackOverflow 修复缩进 ..）

问题：我无法更新 scoreLabel

代码：

游戏HUD.h

#import <Foundation/Foundation.h>
#import "cocos2d.h"

@interface GameHUD : CCLayer {

    CCLabelTTF *scoreLabel;

}

- (void) updateScore:(int)score;

@end

游戏HUD.m

#import "GameHUD.h"

@implementation GameHUD

- (id) init {

    if (self = [super init]) {

        scoreLabel = [CCLabelTTF labelWithString:@"00000" dimensions:CGSizeMake(240,100) hAlignment:kCCTextAlignmentRight fontName:@"Arial" fontSize:32.0f];
        scoreLabel.anchorPoint = ccp(0,0);
        scoreLabel.position = ccp(200,0);
        scoreLabel.color = ccc3(255, 200, 100);

        [self addChild:scoreLabel];

    }

    return self;
}

- (void)updateScore:(int)score {
    scoreLabel.string = [NSString stringWithFormat:@"%i",score];
}

@end

HelloWorldLayer.h

#import "cocos2d.h"
#import "GameHUD.h"

@interface HelloWorldLayer : CCLayer
{
    GameHUD *_hud;
}

@property (nonatomic,retain) GameHUD *hud;

+(CCScene *) scene;

@end

HelloWorldLayer.m

#import "HelloWorldLayer.h"
#import "AppDelegate.h"

#pragma mark - HelloWorldLayer

@implementation HelloWorldLayer
@synthesize hud = _hud;

+(CCScene *) scene
{
    CCScene *scene = [CCScene node];

    HelloWorldLayer *layer = [HelloWorldLayer node];
    [scene addChild: layer];

    GameHUD *hud = [GameHUD node];
    [scene addChild:hud];

    layer.hud = hud;
return scene;
}

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

    // create and initialize a Label
    CCLabelTTF *label = [CCLabelTTF labelWithString:@"Layer A" fontName:@"Marker Felt" fontSize:64];

    // ask director for the window size
    CGSize size = [[CCDirector sharedDirector] winSize];

    // position the label on the center of the screen
    label.position =  ccp( size.width /2 , size.height/2 );

    // add the label as a child to this Layer
    [self addChild: label];

     // Try to update the scoreLabel in the HUD (NOT WORKING)
     [_hud updateScore:74021];

}
return self;
}

// on "dealloc" you need to release all your retained objects
- (void) dealloc
{
    [super dealloc];
}
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1 回答 1

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当您在尚未创建 HUDinit时调用时调用 ，即is 。向对象发送消息是一个无效操作，它不会像在“NULL”对象上调用函数那样崩溃。[HelloWorldLayer node]_hudnilnil

于 2013-04-23T01:28:11.563 回答