I have 3 simple react components-
First the actual view(let us name this screen A)-
return(
<ImageBackground
...
>
<ScrollView>
<ChildButton
onPress={this.someFunction.bind(this)}
/>
</ScrollView>
</ImageBackground>
)
Then there is the ChildButton component---
return(
<ChildButton>
<Button
style={...someStyleObject}
onPress={this.props.onPress}
>
</Button>
</ChildButton>
)
and then there is Button component ---
return (
<TouchableOpacity
onPress={this.props.onPress}
>
{this.props.children}
</TouchableOpacity>
)
The main problem here is my onPress is not getting called from screen A, only on Android. It is working fine on iOS. What are the possible causes here?
Note: I've put consoles inside ChildButton and Button component and they are not getting printed.
I ran into this issue when I accidentally imported TouchableOpacity from "react-native-gesture-handler" instead of from "react-native". If this is the case for you, change so TouchableOpacity is imported from "react-native" and remove the import from "react-native-gesture-handler" and it should work!
I also ran into this issue when I inherited a RN project in progress. I didn't realize we had this "react-native-gesture-handler" package installed and accidentally let VS Code auto import it.
Always check your imports! :)
import {TouchableOpacity} from 'react-native'
works fine in both android and iOS
import {TouchableOpacity} from 'react-native-gesture-handler'
Does not work in android, but works in iOS.
So better to user react-native imports.
onPress event is not calling in android if TouchableOpacity imported from react-native-gesture-handler.
Related
I am experiencing a very weird behaviour in my android emulator when using react-navigation v5 in my react native application, which makes me think is a bug. I found out that there is an open issue on the official react-native-navigation page. See here.
In every secondary screen (see UserProfileScreen below), in many react native-elements like TouchableOpacity Button or TextInput the onPress event doesn't work. It only works in the main screen of the navigator. (See HomeScreen below)
Here is an example of how I create my stack navigator:
import {createStackNavigator} from '#react-navigation/stack';
// some imports here
const HomeStackNavigator = createStackNavigator();
export const HomeNavigator = () => {
return (
<HomeStackNavigator.Navigator>
<HomeStackNavigator.Screen name="HomeScreen" component={HomeScreen}/>
<HomeStackNavigator.Screen name="UserProfileScreen" component={UserProfileScreen}/>
<HomeStackNavigator.Screen name="UserSettingsScreen" component={UserSettingsScreen}/>
</HomeStackNavigator.Navigator>
)
};
As a PoC I have the same code in the main and secondary screen:
<TouchableOpacity
onPress={() => Alert.alert("You pressed me!")} >
<Text> touch me</Text>
</TouchableOpacity>
and I see the alert only in the main screen (HomeScreen).
If I make UserProfileScreen as the fist screen in my stack navigator above then it works (the onPress event) fine on this screen but not in the HomeScreen. So it seems that the onPress event is triggered only in the main screen!. On IOS it works fine in all screens. Any idea ? Let me know if you need some more code snippets.
So I have just started learning app development with React Native this past week and so I've been getting into using Android studio emulators to run my apps. I've noticed that when I run the apps on the emulator, it doesn't seem to refresh the code properly. For example I made this very simple app while following a tutorial:
import React from 'react';
import { Text, View, Platform } from 'react-native';
import {Button} from 'native-base';
export default class App extends React.Component {
render() {
return (
<View style={styles.container}>
<Text>Testing 12321</Text>
<Button><text>Hello World!</text></Button>
</View>
)
}
}
const styles = {
container: {
flex: 1,
marginTop: 24
}
}
But when I first created it, in the tutorial the instructor forgot to put the Text tag within the button, so when I ran the app I got an error of:
Text strings must be rendered within a <Text> component.
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:4137:14 in <anonymous>
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:4134:2 in createTextInstance
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:15909:12 in completeWork
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:19409:28 in completeUnitOfWork
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:19380:30 in performUnitOfWork
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:19347:39 in workLoopSync
- node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:18997:22 in renderRoot
* [native code]:null in renderRoot
and it keeps going. Then in the tutorial the instructor noticed the mistake and fixed it by adding the tag in the button, but then when he does that, the app refreshed properly and displayed the button but for me I still get this same error. I've noticed this happening quite often with the Emulator, it doesnt like to refresh properly when opening a new app or altering one. I have deleted and recreated the emulator like 5 or more times now to test out different apps. Does anyone have a suggestion of how to fix this? Thanks in advance!
Change your <text> to <Text> as below.
<View style={styles.container}>
<Text>Testing 12321</Text>
<Button><Text>Hello World!</Text></Button>
</View>
Feel free for doubts.
When a button is clicked to open the modal, it works for the first time. Upon the second attempt, the app crashes without any error log.
React Native version: 0.61
The trick is to place the Modal tag as a child component in the KeyboardAvoidingView and not otherwise.
like so:
<KeyboardAvoidingView>
<Text> Please upvote! </Text>
<Modal ... >
</Modal>
</KeyboardAvoidingView>
This worked for me.
Hope it helps.
I've been working on this program and I've recently tried to use some new components from the react-native library like Icon and Header but whenever I try to use them in the render function I get error:
"Invariant Violation: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports."
This is really weird to me because I was, and still am, using components like Image, Text, and View without a problem so I don't get why I would be having an issue now with these new components. I'm not sure what I changed in my program to cause something like this to happen.
Only thing I can think of is that "Settings" used to be a default class but it is now not, but that doesn't explain how the old component I was using from the library still work. Keep in mind the other components I imported before like Image and others still work.
Here's and snippet of the offending code:
import React, { Component } from 'react';
import {StyleSheet, Text, View, TouchableHighlight, Image, Header, Icon} from 'react-native';
import { createStackNavigator } from 'react-navigation';
export class Settings extends React.Component {
render(){
return (
<View>
<View style={{height: 55, backgroundColor: '#007ebc'}}>
<View style={{flexDirection: "row", marginLeft: 10}}>
<Icon //<-------USING ICON WILL GIVE ME ERROR
name = 'arrowleft'
/>
<Image source={require("../assets/LogoLrg.png")}
style={{ width: 55, height: 30, marginTop: 10 }}
/>
<Text style={styles.headerText}> Settings </Text>
</View>
</View>
</View>
)
}
I don't think Icon or Header component exists in react-native library.
You can check it in react native website or react-native.js source code.
http://facebook.github.io/react-native/docs/getting-started
Unless I have missed some major update to React Native, you cannot import Header and Icon components from react-native because they don't exist. These components may be a part of some open-source library like react-native-elements or native-base, so you first have to install them:
npm i native-base --save
or,
npm i react-native-elements --save
and then use them:
import { Header, Icon } from 'react-native-elements' //or 'native-base'
RN Elements: Icon, Header
Native Base: Icon, Header
I'm using a recently added (in v0.55.4) prop to TextInput called contextMenuHidden. When I add this prop to a TextInput component it seems to disable copy and paste for iOS but not for Android.
Has anyone else experienced this? Is there another step that needs to happen to get this to disable copy and paste on android?
<TextInput
style={...}
onChangeText={...}
value={...}
contextMenuHidden={true}
/>
for ios
<TextInput contextMenuHidden={true}
for Android
<View removeClippedSubviews={true}>
<TextInput contextMenuHidden={true} />
</View>