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react native "this.setState is not a function"

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react native で"this.setState is not a function"と怒られる

APIのレスポンスを扱おうとした時にコールバック関数内でthis.setStateを使おうとしたらthis.setState is not a functionとエラーがでた。

ググると
https://stackoverflow.com/questions/31045716/react-this-setstate-is-not-a-function/31045750#31045750

こちらにたどり着いた。

どうやらcallback関数内のthisはグローバルのwindowオブジェクトを示してしまうらしいのでes6 のbind(this)をcallback関数につけることで本来参照したいthisを参照できる様になるらしい。

KeyG
やる気がある人プログラミング教えます。気軽に連絡してください。
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