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我正在尝试创建一个 NSError 类别来根据状态代码生成预定义的错误。但是，每当我尝试从我的类别中创建一个 NSError 时，我都会得到一个

+[NSError errorWithDomain:code:userInfo:]: unrecognized selector sent to class 0x2b2b20

我也尝试过调用 NSError Initializer 的实例版本，但结果相同。

+(NSError*)errorOfType:(ErrorType)errorType inClassNamed:(NSString*)_nsClassName andMessage:(NSString*)_nsMessage
{
    return [[[self class] alloc]initWithType:errorType inClassNamed: _nsClassName andMessage:_nsMessage];
}


#pragma mark -
#pragma mark - Init

-(id)initWithType:(ErrorType)errorType inClassNamed:(NSString*)_nsClassName andMessage:(NSString*)_nsMessage
{
    NSInteger _nCode = [self codeFromErrorType:errorType];
    NSDictionary *_nsUserInfo = [self localizedDescriptionForErrorType:errorType andMessage:_nsMessage];

    NSLog(@"Why Does this fail? Is this Nil? %@, \n%i, \n%@", _nsClassName, _nCode, _nsUserInfo);

    if ([self respondsToSelector:@selector(initWithDomain:code:userInfo:)]) {
        if (self = [self initWithDomain:_nsClassName code:_nCode userInfo:_nsUserInfo]){

        }
    }else{
        NSLog(@"NSERROR Did not create!!!");
    }

    return self;
}

当我运行此代码调用静态方法时，输出为：

2013-05-10 17:46:18.851 BMPassSDK-DemoApp[99692:c07] Why Does this fail? Is this Nil? Domain, 
107, 
{
    NSLocalizedDescription = "A connection to the server could not be made. Please Try again later. ";
}
2013-05-10 17:46:18.851 BMPassSDK-DemoApp[99692:c07] NSERROR Did not create!!!
2013-05-10 17:46:18.852 BMPassSDK-DemoApp[99692:c07] +[NSError errorWithDomain:code:userInfo:]: unrecognized selector sent to class 0x2b2b20
(lldb) po 0x2b2b20
$0 = 2829088 NSError
(lldb)

有人对我所缺少的有任何建议吗？

4

1 回答 1

2

当我第一次创建这个类时，它是 NSError 的子类。后来，当我尝试将其从子类转换为类别时，我不小心将头文件的基类重命名为类型 NSObject 而不是 NSError。这当然是导致我的问题的原因，因为 NSObjects 不响应选择器initWithDomain:code:userInfo。

无论如何，感谢大家观看。希望它可以帮助别人。

于 2013-05-15T18:19:26.707 回答