Question

我正在使用this API获取用户的关注者列表，并按照文档中的说明以JSON格式返回关注者。这是返回对象的片段：

{
  "users": [
    {
      "id": 2960784075,
      "id_str": "2960784075",
      "name": "Jesus Rafael Abreu M",
      "screen_name": "chuomaraver",
      "location": "",
      "profile_location": null,
      "url": null,
      "description": "",
      "protected": false,
      "followers_count": 1,
      "friends_count": 101,
      "listed_count": 0,
      "created_at": "Sun Jan 04 19:58:06 +0000 2015",
      .....
      .....
      "default_profile": true,
      "default_profile_image": false,
      "following": false,
      "follow_request_sent": false,
      "notifications": false,
      "muting": false
    },
    .....
    .....
],
  "next_cursor": 1489467234237774933,
  "next_cursor_str": "1489467234237774933",
  "previous_cursor": 0,
  "previous_cursor_str": "0"
}

正如您所注意到的，用户对象有很多属性，我不想这样做逐个解析它们或者使用库来为我做这件事。

TwitterKit有一个名为TWTRUser的类，这里是documentation。要初始化此类的对象，您可以使用一个采用如下JSON字典的构造函数：

let follower = TWTRUser(jsonDictionary: jsonDictionary)

这样我就可以获得解析后返回给我的JSON对象并初始化TWTRUser对象。

问题是TWTRUser没有返回JSON中列出的所有属性，它只有documentation中列出的这些属性：

userID属性
  名称属性
  screenName属性
  isVerified   财产
  isProtected属性
  profileImageURL属性
  profileImageMiniURL属性
  profileImageLargeURL属性
  formattedScreenName属性
  profileURL属性

我尝试使用 valueForKey 方法，该方法接受一个键并返回如下值：

let createdAt = follower.value(forKey: "created_at")

我认为它会起作用，但事实并非如此。当我使用它时，应用程序崩溃并给我以下消息：

由于未捕获的异常'NSUnknownKeyException'而终止应用，原因：'[valueForUndefinedKey：]：这个类对于关键的contributors_enabled而言，它不符合关键值编码。'

如何使用TWTRUser类来获取所有用户的属性？

Answer 1

value(forKey:)是一个继承Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'testService': Unsatisfied dependency expressed through field 'testDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.test.example.TestDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) ... 25 more Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.test.example.TestDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1486) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ... 43 more的方法，它用于Key-Value Coding，因此它不会返回JSON的结果。 NSObject类只定义了10个属性，这就是你可以得到的所有属性。如果你想获得其他属性，你必须使用以下代码行自己解析JSON（使用标准库）

TWTRUser

Answer 2

首先，就像已经提到的那样，不要使用value(for key)，如果对象具有该值，它可能会通过公共财产公开它。

我的建议是将TWTRUser子类化，将您想要的属性添加到新类（您可以将其称为TwitterUser）并覆盖init(json)，在那里您可以看到字典包含您想要的值并将它们添加到对象中。

之后，您将能够像TWTRUser类中的任何其他属性一样访问这些属性。

使用TwitterKit获取用户的完整信息

2 个答案: