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widget状态的生命周期方法
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|name|desc|
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|:----|:----|
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|initState| create之后被insert到渲染树时调用的,只会调用一次|
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|didChangeDependencies| state依赖的对象发生变化时调用|
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|didUpdateWidget| Widget状态改变时候调用,可能会调用多次|
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|build| 构建Widget时调用|
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|deactivate| 当移除渲染树的时调用|
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|dispose| Widget即将销毁时调用|
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