有人可以解释“取消引用空指针"吗?警告 [英] Can someone explain "Dereference of a null pointer" warning

问题描述

我已经编写了一些可以正常运行且看起来没有错误的应用程序(即，它们不会崩溃...)，但是我收到以下代码的警告(我使用了几次)-

I've written a couple of apps which work and seem bug free (ie, they don't crash...) but I get warnings for the code below (which I use a few times) -

在@interface中-

In the @interface -

GameViewController *controller;

在@implementation中-

In the @implementation -

-(id)initWithOwner:(GameViewController *)aController withName:(NSString *)manName {

if (self = [super init]) {
    // do stuff
}

controller = aController;

在最后一行，它说取消引用空指针".我对Objective-C(以及C)还很陌生，所以我不知道这意味着什么.任何帮助和解释表示赞赏！

On that last line, it says "Dereference of a null pointer". I'm fairly new to Objective-C (and C as well) so I haven't a clue what it means. Any help & explanation appreciated!

推荐答案

很抱歉-经过更多研究，我已经找到了问题所在.显然(至少现在很明显！)自我可能最终为零-参见以下文章:取消引用空指针

Sorry folks - I've found out the problem, after a bit more research. Obviously (at least it's obvious now!) self could end up as nil - see this post: Dereference of Null Pointer

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