在iOS中声明实例变量-Objective-C [英] Declaring instance variables in iOS - Objective-C

问题描述

好吧，这几天我已经读了很多关于这个话题的文章，而且我也很困惑，因为每次搜索时答案都是不同的.

Ok, I've read a lot around these days about this topic and I alwyas get confused because the answers is different every search I make.

我需要知道在iOS中声明实例变量的最佳方法.到目前为止，我知道我只应该在.m文件中声明它们，并保持.h干净.但是我做不到:编译器给了我编译错误.

I need to know the best way to declare instance variables in iOS. So far I know I should only declare them inside .m file and leave .h clean. But I can't do it: the compiler gives me compilation erros.

这里仅是.m中的一些代码.

Here is some code from .m only.

@interface UIDesign ()

// .m file
{
    NSString *test2 = @"test2";
}

@property (nonatomic, assign) int privateInt;

@end

@implementation UIDesign
{
    NSString *test1 = @"test1";
}

两个字符串的声明都不正确，我也不知道为什么.编译器说:期望';'在声明列表的末尾.

Both strings are declared incorrectly and I don't know why. The compiler says: expected ';' at end of declaration list.

所以问题是:如何声明实例变量?我只需要在班级里使用它们即可.

推荐答案

您无法初始化实例变量.它们都被初始化为nil或零.因此，编译器在编写等号时会期望使用分号.

You cannot initialize instance variables. They are all initialized to nil or zeroes. So compiler expect a semicolon when you are writing an equal sign.

您可以使用init方法初始化它们.

You can initialize them in init method.

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