ios - RestKit 不在 64 位模拟器中映射 BOOL

Question

我需要帮助来理解下面的错误。

我的 NSObject 中有一个 BOOL 定义为:

@property (nonatomic) BOOL isOpen;

在我的 reskit 类(class)中，我使用:

 [mapping addAttributeMappingsFromDictionary:@{......
                                             @"isOpen":      @"isOpen"
                                             ......}];

在我使用 iPhone4S 和原装 iPhone5 进行的所有测试中，它都完美运行了数周。作为最后一次测试，我在 64 位设备上的模拟器上进行了测试，但出现以下错误:

 restkit.object_mapping:RKMappingOperation.m:440 Failed transformation of value at keyPath 'isOpen' to representation of type '__NSCFBoolean': Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 "Failed transformation of value '1' to __NSCFBoolean: none of the 2 value transformers consulted were successful." UserInfo=0x10cba1c00 {NSLocalizedDescription=Failed transformation of value '1' to __NSCFBoolean: none of the 2 value transformers consulted were successful., detailedErrors=(
"Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 \"The given value is not already an instance of '__NSCFBoolean'\" UserInfo=0x10cb86d30 {NSLocalizedDescription=The given value is not already an instance of '__NSCFBoolean'}",
"Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3000 \"Expected an `inputValue` of type `NSNull`, but got a `__NSCFNumber`.\" UserInfo=0x10cbeb400 {NSLocalizedDescription=Expected an `inputValue` of type `NSNull`, but got a `__NSCFNumber`.}"
 )}

Answer 1

正如 Mikael 所说，在 64 位平台上运行的 RestKit 中存在一些故障，阻止了从 NSNumber 到 BOOL 的默认转换(反之亦然)。

不过，由于 RestKit Value Transformers 模块化架构，有一种方法可以使这项工作正常进行。因此，您只需创建一个专用的转换器类并将其注册到 RestKit 默认转换器。

这就是变压器的样子:

@interface RKCustomBOOLTransformer : NSObject  <RKValueTransforming>

+ (instancetype)defaultTransformer;

@end

@implementation RKCustomBOOLTransformer

+ (instancetype)defaultTransformer {
    return [RKCustomBOOLTransformer new];
}

- (BOOL)validateTransformationFromClass:(Class)inputValueClass toClass:(Class)outputValueClass {
    return ([inputValueClass isSubclassOfClass:[NSNumber class]] &&
         [outputValueClass isSubclassOfClass:[NSNumber class]]);
}

- (BOOL)transformValue:(id)inputValue toValue:(id *)outputValue ofClass:(Class)outputValueClass error:(NSError **)error {
    RKValueTransformerTestInputValueIsKindOfClass(inputValue, (@[ [NSNumber class] ]), error);
    RKValueTransformerTestOutputValueClassIsSubclassOfClass(outputValueClass, (@[ [NSNumber class] ]), error);

    if (strcmp([inputValue objCType], @encode(BOOL)) == 0) {
        *outputValue = inputValue?@(1):@(0);
    } else if (strcmp([inputValue objCType], @encode(int)) == 0) {
        *outputValue = ([inputValue intValue] == 0) ? @(NO) : @(YES);
    }
    return YES;
}

@end

你这样注册:

[[RKValueTransformer defaultValueTransformer]
 insertValueTransformer:[RKCustomBOOLTransformer defaultTransformer] atIndex:0];

在定义映射之前注意进行注册。