从NSDictionary实例化自定义类 [英] Instantiating Custom Class from NSDictionary

问题描述

我有一个感觉，这是愚蠢的问题，但我会问任何...

I have a feeling that this is stupid question, but I'll ask anyway...

我有一个 NSDictionary 对象的键/值对对应于我创建的自定义类，调用 MyClass 。有一个简单的或最佳实践方法，我基本上做一些像 MyClass * instance = [ map NSDictionary 属性为 MyClass ]; ？我有一种感觉，我需要做一些事情与 NSCoding 或 NSKeyedUnarchiver ，而不是绊倒我自己，

I have a collection of NSDictionary objects whose key/value pairs correspond to a custom class I've created, call it MyClass. Is there an easy or "best practice" method for me to basically do something like MyClass * instance = [map NSDictionary properties to MyClass ];? I have a feeling I need to do something with NSCoding or NSKeyedUnarchiver, but rather than stumble through it on my own, I figure someone out there might be able to point me in the right direction.

推荐答案

-setValuesForKeysWithDictionary：方法，以及 -

The -setValuesForKeysWithDictionary: method, along with -dictionaryWithValuesForKeys:, is what you want to use.

示例：

// In your custom class
+ (id)customClassWithProperties:(NSDictionary *)properties {
   return [[[self alloc] initWithProperties:properties] autorelease];
}

- (id)initWithProperties:(NSDictionary *)properties {
   if (self = [self init]) {
      [self setValuesForKeysWithDictionary:properties];
   }
   return self;
}

// ...and to easily derive the dictionary
NSDictionary *properties = [anObject dictionaryWithValuesForKeys:[anObject allKeys]];

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