iOS:Objective-C创建类属性错误:使用未声明的标识符 [英] iOS: Objective-C creating class property error: Use of undeclared identifier

问题描述

我正在尝试根据此示例使用类属性.但出现以下错误:使用未清除的标识符'_myProperty'".

I'm trying to use class property following this example. But I'm getting the following error:"Use of undecleared identifier '_myProperty'".

这是我的实现方式

@interface myClass()

@property (class,strong,nonatomic) NSString *myProperty;

@end


+ (NSString*)myProperty
{
    if (!_myProperty) {

    }
    return [NSString new];
}

为什么我会收到此错误?或您中有人知道解决此问题的方法吗?

Why I'm getting this error? or any of you knows a work around this?

非常感谢您的帮助

推荐答案

Class属性不会在Objective-C中进行综合.您必须提供自己的支持变量和自己的getter/setter:

Class properties don't get synthesized in Objective-C. You have to provide your own backing variable and your own getter/setter:

static NSString *_myProperty = nil;

+ (NSString *)myProperty {
    if (!_myProperty) {
        _myProperty = [NSString new];
    }

    return _myProperty;
}

+ (void)setMyProperty:(NSString *)myProperty {
    _myProperty = myProperty;
}

这篇关于iOS:Objective-C创建类属性错误:使用未声明的标识符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！