目录1、什么是key2、key的更新原理3、key的分类GlobalKeyLocalKey总结1、什么是key Widget中有个可选属性key，顾名思义，它是组件的标识符，当设置了key，组件更新时会根据新老组件的key是否相等来进行更新，可以提
I have a static variable partner in the class. And I want to set a value of these variable whenever a radio button is pressed. This is the code I tried to use:
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