React Native：ScrollView 中的 TouchableOpacity onPress 问题

Question

I am running react native 0.24.1 and I am experiencing an issue with the <TouchableOpacity> component when it is placed inside an <ScrollView> .

Its onPress events fire fine but there is a special case when they do not. If along with the <TouchableOpacity> component you have a <TextInput> , and the current focus is on the <TextInput> box, then you may click on the <TouchableOpacity> and you will see its onPress event WILL NOT be fired.

At least the first time you do it. Once the focus is NOT on the <TextInput> anymore, you can now press on the <TouchableOpacity> component and its onPress event will fire just fine.

Note that if the <TouchableOpacity> component is placed inside a <View> instead of an <ScrollView> everything works as expected and the above issue does not apply.

Here is some code to demonstrate the problem:

const React = require('react-native');
const {
  Component,
  Dimensions,
  View,
  ScrollView,
  Text,
  TextInput,
  TouchableOpacity,
} = React;


// ----------------------------------------------------------------------------
class TouchableOpacityTest extends Component {
  constructor(props, context) {
    super(props, context);
    this.state = {count_onPress:0,count_onPressIn:0,count_onPressOut:0,count_onLongPress:0};
  }
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  onPressEvent(what,e) {
    console.log('what:',what);
    let newState = {};
    newState['count_'+what] = ++this.state['count_'+what];
    this.setState(newState);
  }
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  render() {
    let touchableProps = {
      onPress: this.onPressEvent.bind(this,'onPress'),
      onPressIn: this.onPressEvent.bind(this,'onPressIn'),
      onPressOut: this.onPressEvent.bind(this,'onPressOut'),
      onLongPress: this.onPressEvent.bind(this,'onLongPress'),
    }

    return (
      <View style={{flex:1,flexDirection:'column',justifyContent:'flex-start',alignItems:'center',backgroundColor:'blue'}} >
        <ScrollView style={{width:Dimensions.get('window').width*0.9,backgroundColor:'red'}}>
          <TextInput style={{backgroundColor:'rgb(200,200,200)',marginTop:14}}
            placeholder="Focus on me,hide keyboard,and click on text below"
            autoCorrect={false}
          />
          <TouchableOpacity {...touchableProps} >
            <Text style={{fontSize:20,backgroundColor:'pink',marginTop:14}}>
              Click on me!{"\n"}
              onPress:{this.state.count_onPress}{"\n"}
              onPressIn:{this.state.count_onPressIn}{"\n"}
              onPressOut:{this.state.count_onPressOut}{"\n"}
              onLongPress:{this.state.count_onLongPress}{"\n"}
            </Text>
          </TouchableOpacity>
        </ScrollView>
      </View>
    );
  }
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
}
// ----------------------------------------------------------------------------
AppRegistry.registerComponent('react_native_app1', () => TouchableOpacityTest);

You may replace the <ScrollView> with a <View> component on the above code and you will see that onPress event fires every time, even when the focus is on the <TextView>

NOTE: I am working on Android. I have no idea if this happens also on iOS.

NOTE 2: According to Aakash Sigdel, this is indeed happening on iOS too.

Answer 1

Set keyboardShouldPersistTaps={true} on your ScrollView .

Duplicate answer here: https://stackoverflow.com/a/34290788/29493

UPDATE: As Hossein writes in his answer, true|false has been deprecated in newer versions in favor of always|never|handled .

Answer 2

Set keyboardShouldPersistTaps='always' to your ScrollView props.

React Native Documentation:

'never' (the default), tapping outside of the focused text input when the keyboard is up dismisses the keyboard. When this happens, children won't receive the tap.

'always' , the keyboard will not dismiss automatically, and the scroll view will not catch taps, but children of the scroll view can catch taps.

'handled' , the keyboard will not dismiss automatically when the tap was handled by a children, (or captured by an ancestor).

false , deprecated, use 'never' instead.

true , deprecated, use 'always' instead.

Answer 3

In my case, I was using alignItems:'baseline', when I switched to alignItems:'center' , it started working smoothly. Don't know why