Develop Reference

React Native auth error handle with <View> component

i'm handling firebase auth errors and i cant show error message on screen
here is my code;
if (error.code === "auth/user-not-found") {
return (
<View>
<Text>user not found</Text>
<Text>try create a account or check ur mail and passwrd</Text>
</View>
)
}
but i use alert it works perfectly.
how can i solve it ?

Try to add some styles in your components so you can see something.
if (error.code === "auth/user-not-found") {
return (
<View style={{flex: 1, width: "100%", height: "100%", backgroundColor: "#f00"}}>
<Text>user not found</Text>
<Text>try create a account or check ur mail and passwrd</Text>
</View>
)
}
I like to try first with full width and height, and with a very basic color (in this case red) so I can watch whats happening in my views. Remember that you can save and metro gonna refresh your app in your emulator/phone.

React-native-google-places-autocomplete does not work in a Scroll View? VirtualizedLists should never be nested inside plain ScrollViews ERROR

This one was already discussed, but from I was able to see there is still no available solution for the issue. I have read all the documents regarding the matter. The error I am getting is: "VirtualizedLists should never be nested inside plain ScrollViews with the same orientation because it can break windowing and other functionality - use another VirtualizedList-backed container instead" In the official documents on the plugin, it is suggested application of <ScrollView keyboardShouldPersistTaps={'handled'}>. However, this does not fix the issue. How can I display it inside the Scroll view? Below is my code Thanks
import React from 'react';
import { GooglePlacesAutocomplete } from 'react-native-google-places-autocomplete';
export const GooglePlacesInput = () => {
return (
<GooglePlacesAutocomplete
placeholder='Search'
onPress={(data, details = null) => {
// 'details' is provided when fetchDetails = true
console.log(data, details);
}}
query={{
key: 'my Key',
language: 'en',
}}
/>
);
};
And I want to display it inside the scroll view
export const IznajmiScreen = () => (
<>
<IznajmiListContainer>
<ScrollView keyboardShouldPersistTaps={'handled'} >
<TextInput style={styles.input} placeholder="Naslov" />
<MyDatePickerStart/>
<MyDatePickerEnd/>
<GooglePlacesInput/>
</ScrollView>
</IznajmiListContainer>
</>
)

I found the solution but first do not add this,
import { LogBox } from 'react-native';
LogBox.ignoreLogs(['VirtualizedLists should never be nested inside plain ScrollViews with the same orientation - use another VirtualizedList-backed container instead.']);
to your code. You are simply shutting up your application from warning you about errors.
Simply add "horizontal={true}" to any ScrollView wrapping your component like this.
<ScrollView
horizontal={true}
nestedScrollEnabled={true}
keyboardShouldPersistTaps='handled'
contentContainerStyle={{ flexGrow: 1 }}
>
<GooglePlacesAutocomplete/>
</ScrollView>
Happy coding from Nigeria :).

React Native: Image using prop as source leads to error

I am building a react native application and am trying to set the source of an image based on the contents that I am passing to the component as a prop. My code is as follows:
const nameOfComponent = props => {
return (
<View style={some style}>
<Image source={require(props.imageURL)} style={some style} />
</View>
)
}
The prop imageURL is being passed down from the parent component by:
<nameOfComponent imageURL="../dir/name.png" />
When including the code above in my project, I am met with an error saying "Invalid call at line 15: require(props.imageURL)".
Why is this happening? Thanks!

According to React-Native, all your image sources need to be loaded before compiling your bundle. So change your code as,
const nameOfComponent = props => (
<View style={{ some_style }}>
<Image source={props.imageURL} style={{ some_style }} />
</View >
)
Call your child component as,
<nameOfComponent imageURL={require('imagepath')} />
Hope this helps you. Feel free for doubts.

React Native FlatList keyboardShouldPersistTaps not persisting

I have a very frustrating situation. Trying to get keyboard to disappear and detect onPress event handler in child row.
Here is what my code looks like:
_renderRow = (prediction) => {
return (
<TouchableOpacity onPress={() => {
Keyboard.dismiss();
this.setState({ location: prediction.description });
}}>
<View style={styles.listItemContainer}>
<Text>{prediction.description}</Text>
</View>
</TouchableOpacity>
)
}
render() {
return (
<View style={styles.wrapper}>
{/* style={[this.state.predictions.length > 0 ? styles.searchContainerSuggest : styles.searchContainer]} */}
<View style={styles.searchContainerSuggest}>
<View style={{paddingLeft: 10, height: 45, display: 'flex', justifyContent: 'center'}}>
<TextInput
placeholder="Enter location"
value={this.state.location}
onChangeText={location => this.onChangeLocation(location)}
style={styles.textInput}
/>
</View>
{this.state.predictions.length && this.state.location !== '' ?
<FlatList
keyboardShouldPersistTaps={'handled'}
refreshing={!this.state.loaded}
initialNumToRender={10}
enableEmptySections={true}
data={this.state.predictions}
keyExtractor={(_, index) => index.toString()}
renderItem={ ({item: prediction}) => this._renderRow(prediction) } />
: null}
</View>
</View>
);
}
I probably need a helping hand or two with regards to how to debug this issue.
Looked up several examples on how to deal with hiding the keyboard and allowing a particular selection to be pressed at the same time.
I thought that keyboardShouldPersistTaps would allow for the child selection to be selected. Upon selection, the onPress event handler will trigger and that will be where I call Keyboard.dismiss() to hide the keyboard. Does not seem to work.

In my case, besides adding keyboardShouldPersistTabs='handled' to the FlatList in question, it was also needed to add keyboardShouldPersistTabs='handled' and nestedScrollEnabled={true} to a parent ScrollView like 2 levels above, wrapping the FlatList I intended to get this behavior with. Check out this issue in react-native repo for more info.

For anyone who is running into the same problem as me. Check whether your FlatList or ScrollView is nested in another FlatList or ScrollView.
If yes, then add
keyboardShouldPersistTaps='handled'
to the element as a props as well.

add keyboardDismissMode="none" to FlatList

QR Scanner react-native crash on second invocation

Im using react-native-qrcode-scanner from https://github.com/moaazsidat/react-native-qrcode-scanner and I read perfectly the code but when I go back to qr-scanner again it crashes.
I think it is because the camera is still working on background, there is a way to close it when it ends?

I believe you are having the same issue as this one on that github page.
And would recommend using that page to submit your problems regarding that software.

The following solution worked for navigation between Camera screen and others:
In Constructor:
this.state = {
focusedScreen: true
};
In render:
render() {
const { focusedScreen } = this.state;
if (!focusedScreen){
return <View />;
} else
{
return (
<QRCodeScanner ............
)
}

<QRCodeScanner
onRead={this.onSuccess.bind(this)}// change {this.onSuccess} to {this.onSuccess.bind(this)}
topContent={
<Text style={styles.centerText}>
Go to <Text style={styles.textBold}>wikipedia.org/wiki/QR_code</Text> on your computer and scan the QR code.
</Text>
}
bottomContent={
<TouchableOpacity style={styles.buttonTouchable}>
<Text style={styles.buttonText}>OK. Got it!</Text>
</TouchableOpacity>
}
/>