RACObserve(target,keypath) 后面的keypath在输入的时候编辑器中会有target的属性alt text
http://pan.baidu.com/s/1qWmAKGG
就像图中的address，这是怎么实现的？
http://pan.baidu.com/s/1qWmAKGG
就像图中的address，这是怎么实现的？
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