ReactNative TextInput焦点

Question

我在我的应用程序中有一个表单，我希望用户能够通过单击＆＃34; Next＆＃34;来转到下一个TextInput。返回按钮。 我的输入组件：

    export default class Input extends Component {

  focusNextField = (nextField) => {
    console.log('NEXT FIELD:', nextField);
    this.refs[nextField].focus();
  }

  render() {

    var keyboardType = this.props.keyboardType || 'default';
    var style = [styles.textInput, this.props.style];

    if (this.props.hasError) style.push(styles.error);

    return (
      <View style={styles.textInputContainer}>
        <TextInput
          placeholder={this.props.placeholder}
          onChangeText={this.props.onChangeText}
          style={style}
          blurOnSubmit={false}
          ref={this.props.reference}
          returnKeyType= {this.props.returnType}
          onSubmitEditing={() => this.focusNextField(this.props.fieldRef)}
          secureTextEntry={this.props.isPassword}
          value={this.props.value}
          keyboardType={keyboardType}
          underlineColorAndroid="transparent" />
        {this.props.hasError && this.props.errorMessage ? <Text style={{ color: 'red' }}>{this.props.errorMessage}</Text> : null}
      </View>
    );
  }
}

以及如何使用它：

<Input onChangeText={(email) => this.setState({ email })} value={this.state.email} returnType={"next"} reference={'1'} fieldRef={'2'} keyboardType="email-address" />

      <Text style={{ color: '#fff', marginTop: 10, }}>Password</Text>
      <Input onChangeText={(password) => this.setState({ password })} value={this.state.password} returnType={"done"}
       reference={'2'} fieldRef={'2'} isPassword={true} />

但我收到错误：

undefined is not an object (evaluating _this.refs[nextField].focus)

Answer 1

不确定您是否仍在尝试这样做，但对于遇到此问题的其他人，请执行以下操作：

1. 将此代码添加到导入（导入中的任何位置）

   import { findNodeHandle } from 'react-native';
   import TextInputState from 'react-native/lib/TextInputState';
   export function focusTextInput(node) {
     try {
       TextInputState.focusTextInput(findNodeHandle(node));
     } catch(e) {
       console.log("Couldn't focus text input: ", e.message)
     }
   };
   

2. 将以下行添加到构造函数

   this.focusNextField = this.focusNextField.bind(this);
   this.inputs = {};
   

3. 将以下功能添加到您的班级

   focusNextField(id) {
     this.inputs[id].focus();
   }
   

4. 按照以下方式修改TextInput：

   <TextInput
     onSubmitEditing={() => {this.focusNextField('two');}}
     ref={ input => {this.inputs['one'] = input;}}
   />
   <TextInput
     onSubmitEditing={() => {this.focusNextField('three');}}
     ref={ input => {this.inputs['two'] = input;}}
   />
   ....
   

Here is the source of that answer

为我工作了0.45。