Question

我是目标c的新手。我不明白为什么我的函数不起作用，它在返回函数时发出错误SIGBART。

+ (NSArray*) jsonToArray:(NSString*)jsonString
{
    id mappedObj = nil;
    RKObjectMappingProvider* mapProv = [[RKObjectMappingProvider alloc] init];

    RKObjectMapping* answerMapping = [SMAnswersWrapper entityMappingForSerializer];
    answerMapping.objectClass = [NSMutableDictionary class];

    [mapProv setSerializationMapping:answerMapping forClass:[SMAnswersWrapper class]];
    RKObjectMapping *proofsEntityMapping = [SMEntityArrayWrapper entityMappingWithContentMapping:answerMapping];

    [mapProv setMapping:proofsEntityMapping forKeyPath:@""];

    if (jsonString)
    {
        id obj = [jsonString objectFromJSONString];
        if (obj)
        {
            RKObjectMapper* mapper = [[RKObjectMapper alloc] initWithObject:obj mappingProvider:mapProv];

            RKObjectMappingResult* res = [mapper performMapping];
            mappedObj = [res asCollection];

            [mapper release];
        }
    }
    [mapProv release];
    return [[[mappedObj content] retain] autorelease];
}

错误位置在此行：

return [[[mappedObj content] retain] autorelease];

谢谢。

修改

我发现了我的错误，我无法访问[[[mappedObj content] retain] autorelease];的内容，我必须转换mappedObj。

Answer 1

请尝试以下操作：

+ (NSArray*) jsonToArray:(NSString*)jsonString
{
    id mappedObj = nil;
    RKObjectMappingProvider* mapProv = [[RKObjectMappingProvider alloc] init];

    RKObjectMapping* answerMapping = [SMAnswersWrapper entityMappingForSerializer];
    answerMapping.objectClass = [NSMutableDictionary class];

    [mapProv setSerializationMapping:answerMapping forClass:[SMAnswersWrapper class]];
    RKObjectMapping *proofsEntityMapping = [SMEntityArrayWrapper entityMappingWithContentMapping:answerMapping];

    [mapProv setMapping:proofsEntityMapping forKeyPath:@""];

    if (jsonString)
    {
        id obj = [jsonString objectFromJSONString];
        if (obj)
        {
            RKObjectMapper* mapper = [[RKObjectMapper alloc] initWithObject:obj mappingProvider:mapProv];

            RKObjectMappingResult* res = [mapper performMapping];
            mappedObj = [res asCollection];

            [mapper release];
        }
    }
    [mapProv release];
    if (mappedObj)
    {
        return [[[mappedObj content] retain] autorelease];
    }
    return [NSArray array];

}

如果jsonString或obj为nil，则在您的代码中，不会初始化mappedObj。这种情况可能会在访问[mappedObj content]时导致崩溃。

试试这个，这会对你有所帮助.....

Answer 2

我发现了我的错误，我无法访问[[[mappedObj content] retain] autorelease];的内容，我必须投射mappedObj。

为什么返回功能发出SIGBART信号？

2 个答案: