TextInput组件不会被清除

Question

我有TextInput组件，在其引用上调用clear()时不会清除。奇怪的是，我在另一个组件中还有其他TextInput，并且在那儿工作得很好。知道会是什么吗？

无可用代码：

         <View style={styles.addLinkContainer}>
          <TextInput
            autoCorrect={false}
            ref={input => { this.txtInput = input }}
            style={styles.linkInput}/> 
            <TouchableOpacity onPress={() => {this.foo(this.fee)}}>
              <IconFA name="arrow-right" size={scale(30)} color="#a6a6a6"/>
            </TouchableOpacity>
          </View>


    foo = (url) => {
    ...
        this.txtInput.clear()
        this.txtInput.blur()
    ...

   }

在另一个组件中的工作代码：

        <KeyboardAvoidingView behavior="padding" enabled style={{width:'100%'}}>    
           <View style={{flex:1, flexDirection: 'row'}}>
            <TextInput
              multiline={true}
              ref={input => this.input = input}
              style={[newStyle]}
              onChangeText={(text) => this.commentPlaceHolder = text}
              value={this.commentPlaceHolder}
            /> 
            <TouchableOpacity onPress={() => this.foo()}>
              <IconFA name="rocket" size={scale(30)} color="#a6a6a6"/>
            </TouchableOpacity>
            </View>
          </CardAction> 
        </KeyboardAvoidingView>


    foo = () => {
    ...
        this.input.clear()
    ...

   }