AlertIOS undefined errors (React Native)

Question

I'm trying to use AlertIOS in a brand new React Native project, but for some reason I'm getting undefined-related errors.

The relevant parts of the code:

import { AlertIOS } from 'react-native';

// Callback for a button press
const _alert = () => {
  AlertIOS.alert('title', 'text')
}

If I'm not in debug mode, after clicking the button I get the error undefined is not an object (evaluating '_reactNative.AlertIOS.alert').

When debugging, the error changes to Cannot read property alert of undefined and AlertIOS has the value shown in the print below, which doesn't seem right.

Also, if I just use Alert.alert, it works (obviously changing the import).

Are you checking in Ios Device/Simulator because it will not work in Android. According to documentation , We recommend using the Alert.alert method for cross-platform support if you don't need to create iOS-only prompts. — Mehran Khan
– Mehran Khan, Commented Aug 26, 2019 at 3:04
@MehranKhan I was testing in the iOS Simulator, but AlertIOS was removed (check the accepted answer). Thanks! — Schrute
– Schrute, Commented Aug 26, 2019 at 15:14

JDune · Accepted Answer · 2019-11-27 14:53:26Z

2

In RN 0.61, the AlertIOS functionality is now part of Alert itself. So for example, instead of AlertIOS.prompt, you can do the following:

import {Alert} from 'react-native';

Alert.prompt('Alert Title', 'message', [
    {
        text: 'ok',
        onPress: str => console.log('Entered string: ' + str),
    },
    {
        text: 'Cancel',
        onPress: () => console.log('Pressed Cancel!'),
        style: 'cancel',
    },
]);

See this issue for details

answered Nov 27, 2019 at 14:53

JDune

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Comments

user3324363 · Accepted Answer · 2019-08-26 05:51:44Z

1

I faced the same problem in RN 0.60. Seem like it's removed. You can check its source https://github.com/facebook/react-native/blob/master/Libraries/react-native/react-native-implementation.js#L50

There are some good alternatives like this one

answered Aug 26, 2019 at 5:51

user3324363

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1 Comment

Schrute Over a year ago

Yeah, I just found the commit that removed it, weird that the official documentation isn't updated.

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