如何在RestKit映射成功后访问对象

Question

在这里完成了RestKit文档之后，我现在已经成功地进行了对象映射。哇！我现在的问题是如何在整个项目中访问这个对象？我使用RestKit将JSON响应映射到APIUser对象。例如，在下一个屏幕上，我想从APIUser对象中获取用户的名字来打招呼。如何访问该对象？

我是objective-c的新手，所以这可能更多的是关于在objective-c中使用全局对象、单例类和跨类持久化数据的问题，而不是关于RestKit框架的问题。

这里发布的是我的restkit对象映射日志，以防它有助于引用它。谢谢。感谢您的帮助。

2012-07-30 14:54:04.813 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMapper.m:240 Performing object mapping sourceObject: {
    apiUser =     {
        active = 1;
        apiUserIdx = 101;
        birthdate = "1980-06-21T00:00:00-06:00";
        countryCode = US;
        firstName = "test_user1_firstname";
        lastName = "test_user1_lastname";
        ssn = 1111;
        userName = "test_user1";
        verified = 1;
    };
}
 and targetObject: (null)
2012-07-30 14:54:04.813 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMapper.m:254 Examining keyPath 'errors' for mappable content...
2012-07-30 14:54:04.813 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMapper.m:264 Found unmappable value at keyPath: errors
2012-07-30 14:54:04.814 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMapper.m:254 Examining keyPath 'apiUser' for mappable content...
2012-07-30 14:54:04.814 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMapper.m:283 Found mappable data at keyPath 'apiUser': {
    active = 1;
    apiUserIdx = 101;
    birthdate = "1980-06-21T00:00:00-06:00";
    countryCode = US;
    firstName = "test_user1_firstname";
    lastName = "test_user1_lastname";
    ssn = 1111;
    userName = "test_user1";
    verified = 1;
}
2012-07-30 14:54:04.814 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMapper.m:189 Asked to map source object {
    active = 1;
    apiUserIdx = 101;
    birthdate = "1980-06-21T00:00:00-06:00";
    countryCode = US;
    firstName = "test_user1_firstname";
    lastName = "test_user1_lastname";
    ssn = 1111;
    userName = "test_user1";
    verified = 1;
} with mapping RKObjectMapping class => APIUser: keyPath mappings => (
    "RKObjectKeyPathMapping: lastName => lastName",
    "RKObjectKeyPathMapping: birthdate => birthdate",
    "RKObjectKeyPathMapping: countryCode => countryCode",
    "RKObjectKeyPathMapping: firstName => firstName",
    "RKObjectKeyPathMapping: password => password",
    "RKObjectKeyPathMapping: apiUserIdx => apiUserIdx",
    "RKObjectKeyPathMapping: active => active",
    "RKObjectKeyPathMapping: userName => userName",
    "RKObjectKeyPathMapping: verified => verified"
)
2012-07-30 14:54:04.815 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMappingOperation.m:428 Starting mapping operation...
2012-07-30 14:54:04.816 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'lastName' to 'lastName'
2012-07-30 14:54:04.816 TestApp[2361:1a707] D restkit.object_mapping:RKObjectPropertyInspector.m:95 Cached property names and types for Class 'APIUser': {
    accessibilityHint = NSString;
    accessibilityLabel = NSString;
    accessibilityLanguage = NSString;
    accessibilityValue = NSString;
    birthdate = NSDate;
    countryCode = NSString;
    firstName = NSString;
    lastName = NSString;
    password = NSString;
    userName = NSString;
}
2012-07-30 14:54:04.818 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'lastName' to 'lastName'. Value: test_user1_lastname
2012-07-30 14:54:04.818 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'birthdate' to 'birthdate'
2012-07-30 14:54:04.818 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:115 Found transformable value at keyPath 'birthdate'. Transforming from type '__NSCFString' to 'NSDate'
2012-07-30 14:54:04.818 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:97 Transforming string value '1980-06-21T00:00:00-06:00' to NSDate...
2012-07-30 14:54:04.819 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:259 Skipped mapping of attribute value from keyPath 'birthdate to keyPath 'birthdate' -- value is unchanged ((null))
2012-07-30 14:54:04.821 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'countryCode' to 'countryCode'
2012-07-30 14:54:04.822 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'countryCode' to 'countryCode'. Value: US
2012-07-30 14:54:04.822 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'firstName' to 'firstName'
2012-07-30 14:54:04.822 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'firstName' to 'firstName'. Value: test_user1_firstname
2012-07-30 14:54:04.822 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:291 Did not find mappable attribute value keyPath 'password'
2012-07-30 14:54:04.823 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'apiUserIdx' to 'apiUserIdx'
2012-07-30 14:54:04.839 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'apiUserIdx' to 'apiUserIdx'. Value: 101
2012-07-30 14:54:04.840 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'active' to 'active'
2012-07-30 14:54:04.840 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'active' to 'active'. Value: 1
2012-07-30 14:54:04.840 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'userName' to 'userName'
2012-07-30 14:54:04.840 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'userName' to 'userName'. Value: test_user1
2012-07-30 14:54:04.841 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:242 Mapping attribute value keyPath 'verified' to 'verified'
2012-07-30 14:54:04.845 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMappingOperation.m:252 Mapped attribute value from keyPath 'verified' to 'verified'. Value: 1
2012-07-30 14:54:04.845 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMappingOperation.m:434 Finished mapping operation successfully...
2012-07-30 14:54:04.846 TestApp[2361:1a707] T restkit.object_mapping:RKObjectMapper.m:254 Examining keyPath 'error' for mappable content...
2012-07-30 14:54:04.846 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMapper.m:264 Found unmappable value at keyPath: error
2012-07-30 14:54:04.846 TestApp[2361:1a707] D restkit.object_mapping:RKObjectMapper.m:304 Finished performing object mapping. Results: {
    apiUser = "<APIUser: 0xcd8b170>";
}

Answer 1

我想我想通了。我需要创建一个APIUser的新实例，并将其设置为[objects objectAtIndex:0].，如中所示

- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects:(NSArray*)objects {
    NSLog(@"There are %i objects.", objects.count);
    APIUser *apiUser = [objects objectAtIndex:0];
    NSLog(@"Loaded apiUserIdx #%i -> First name: %@, Last name: %@", apiUser.apiUserIdx, apiUser.firstName, apiUser.lastName);
}