How to call AlertIOS in React Native

Question

I am an iOS developer, but I know a little javascript. I am trying to use the AlertIOS, the document api is this

static alert(title: string, message?: string, buttons?: Array<{ text: ?string; onPress: ?Function; }>) 

I am confused with the parameters. I tried to write like this,but it give me error. AlertIOS('Username empty', 'Please type your username', buttons: {{text: 'Cancel', onPress: onPressCancel}});

How can i use AlertIOS properly ?

Answer 1

If you look at the documentation, it's says that there's an AlertIOS API with a static method called alert. That means you can call it like this:

AlertIOS.alert('Username empty', 'Please type your username', [{text: 'Cancel', onPress: onPressCancel}]);

Notice that you also don't need the "buttons:" prefix for the buttons array - that part of your call wasn't valid syntax anyway.

The method signature for alert is documented using Flow type annotations. Each argument is described like this:

• name of argument: type of argument

And if the name has a question mark, that argument is optional. So, in this case the arguments are:

• title, with a type of string
• message, with a type of string (optional)
• buttons, with a type of array (optional)

You'll also need to make sure you require the AlertIOS API, probably something like this:

var {
  AppRegistry,
  StyleSheet,
  View,
  AlertIOS
} = React;

Hope that helps.