关于实例变量和奇怪的错误超类 [英] Strange error regarding instance variables & superclass

问题描述

我有一些代码，我的类从一个超类继承，一切都一直工作到现在。我得到一个错误，当我尝试使用任何超类变量，说他们是未声明（首先在此函数中使用）。它只发生在我的一个子类，&它看起来完全一样的其他人。我想知道是否有任何明显的我应该知道（对Objective-C是新的）。基本代码如下 -

I've got some code where my classes inherit from a superclass, and everything has been working fine till now. I'm getting an error whenever I try to use any of the superclass variables, saying that they are undeclared (first use in this function). It's only happening in one of my subclasses, & it looks exactly the same as the others. I'm wondering if there's anything obvious which I should know about (being quite new to Objective-C). The basic code is like -

@interface mySuperClass : UIViewController {

BOOL myVar;

}

然后 -

@interface mySubClass : mySuperClass {

}

@implementation mySubClass {

-(void)someMethod {

    myVar = YES; // error here

}

@end

任何帮助非常感激 - 如果你需要更多的信息，让我知道！感谢。

Any help much appreciated - if you need more info, let me know! Thanks.

推荐答案

我刚刚遇到一个非常类似的奇怪的错误，我不能再访问属性在我的超类， givine我编译器错误说（*）undeclared（首次使用此函数）。但是我过去没有任何问题...

I just got over a very similar strange error where I could no longer access properties in my superclass, and xcode was givine me compiler errors saying "(*) undeclared (first use in this function)". However I had not any problems in the past...

问题是，我在我的.m文件的顶部引入了错别字，而xcode编译器输出是误导我。具体来说，我有@synthesize语句，其中的属性拼写错误，无论是在synthesize语句或在头文件中的相应变量。

The problem was that I had introduced typos at the top of my .m file and the xcode compiler output was misleading me. Specifically I had @synthesize statements where the properties were misspelled, either in the synthesize statement or in the corresponding variable in the headerfile.

如果您有@synthesize语句或其他声明，请使用精细齿梳（即您最近引入的那些行）检查它们，或者甚至注释掉块

If you have @synthesize statements or other declarations, examine them with a fine toothed comb (i.e. which lines have you introduce most recently?), or even comment out a block of them to see if you can compile again and narrow down the culprit.

再次，编译器错误是非常误导的，所以它真的很难调试。虽然像99.9％的时间的错误是我自己的。 ：）

Again the compiler errors were very misleading, so it really was tough to debug. Although like 99.9% of the time the error was my own. :)

这篇关于关于实例变量和奇怪的错误超类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！