How to call React Native custom alert as a function?

I'm developing a React Native app. I created my own custom alert as a component using modal. When I use it, I always need to add my alert component in my render() function.

Is there any way to use the custom alert without rendering it inside my render() function?

I mean, I can use Alert in react-native by calling it as Alert.alert(). I want to use my own custom alert also like that.

How can I do that?