为什么我不能在Cocos2d / Objective c中使用这个sprite？ [英] Why can't I use this sprite in Cocos2d/Objective c?

问题描述

在我的游戏中，在目标c，我有两个类，主要的ArcherClass和人类。
这是人类的.m的一部分。

In my game in objective c, I have two classes, The main ArcherClass and the person class. Here is part of the .m of the person class.

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

    if (self) {
        _bow = [CCSprite spriteWithFile:@"bpw.png"];

    }
    return self;
}

这里是ArcherClass.m的一部分

Here is part of main ArcherClass.m

  Player *object = nil;
        CCSprite *bow;

        bow = [object bow];

        //bow = [CCSprite spriteWithFile:@"bow.png"];
        [self addChild:bow z:1];

        bow.position = ccp(150,150);

以下代码由于我注释掉的部分而产生sigbart错误。如果我删除注释，代码工作正常。

The following code gets a sigbart error, because of the part I commented out. If I delete the comment, the code works fine.

为什么我不能使用在Person类中声明的图像文件？我已经宣布精灵具有那个图像价值或任何东西，但由于某种原因，我必须重新声明我的主类中的图像？这是为什么。

Why can I not use the image file declared in the Person class? I already declared that sprite as to having that image value or whatever, but for some reason I have to re-declare the image in my main class? Why is that.

推荐答案

假设你的person类和Player类是相同的东西， >

Assuming that your "person" class and "Player" classes referred to are the same thing, this code:

Player *object = nil;         
CCSprite *bow;          
bow = [object bow];

将 bow 设置为 nil 。您尚未初始化 object ，因此任何调用的方法都会返回 nil 。

Is going to set bow to nil. You haven't initialised object so any methods called on it will return nil.

在您的代码中，您需要以下代码：

Somewhere in your code you need the following:

Player *object = [[Player alloc] init];

很难说没有更多上下文的地方，但如果你发送消息给对象，有一个有效的实例。你不说如何射手类和玩家类是相关的。

It's difficult to say where without more context, but if you are sending messages to object, you need to have a valid instance of it. You don't say how the archer class and player classes are related.

这篇关于为什么我不能在Cocos2d / Objective c中使用这个sprite？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！