我正在运行react native 0.24.1,并且在将<TouchableOpacity>
组件放置在<ScrollView>
内时遇到了问题。
它的onPress事件可以正常触发,但有一种特殊情况下不会触发。
如果与<TouchableOpacity>
组件一起使用一个<TextInput>
,并且当前焦点在<TextInput>
框上,那么您可能会单击<TouchableOpacity>
,但是它的 onPress 事件将不会被触发。
至少第一次这样做。一旦焦点不再在<TextInput>
上,您现在可以按下<TouchableOpacity>
组件,它的onPress事件就会正常触发。
请注意,如果<TouchableOpacity>
组件放置在<View>
而不是<ScrollView>
中,则一切正常,上述问题不适用。
以下是演示问题的一些代码:
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);
您可以将上述代码中的<ScrollView>
替换为<View>
组件,您会发现onPress事件每次都会触发,即使焦点在<TextView>
上。
注:我正在使用Android。 我不知道这是否也会发生在iOS上。
注2:根据Aakash Sigdel的说法,这确实也会在iOS上发生。