当 TextInput onFocus 和 onBlur.React-Native 时更改样式

问题描述：

我在 5 页中有 40 个 TextInput，需要更改输入文本颜色 onfocus:'white' 和 onBlur:'gray'我知道如何进行单输入.但我需要多输入

I have 40 TextInput in 5 page and need to change input text color onfocus:'white' and onBlur:'gray' I know how make it for single input.But I need for multiple input

<TextInput 
  clearTextOnFocus={true}
  keyboardType="number-pad"
  style={[this.state.isFocused?styles.inputOnFocus:styles.input]}
  onChangeText={v=>handleInput('value',v)}
  value={this.state.value}
  onFocus={()=>this.setState({isFocused:true})}
  onBlur={()=>this.setState({isFocused:false})}

/>

答

您可以简单地为每个 Inputs 指定一个 ID，并使用该 ID 来知道哪个 ID 被关注:

You can simply give each one of the Inputs an ID and use that one to know which ID is focused:

<TextInput 
  clearTextOnFocus={true}
  keyboardType="number-pad"
  style={[this.state.FocusedItem === "TextInput1"? styles.inputOnFocus : styles.input]}
  onChangeText={v=>handleInput('value',v)}
  value={this.state.value}
  onFocus={()=>this.setState({FocusedItem: "TextInput1"})}
  onBlur={()=>this.setState({FocusedItem: ""})}
/>

在 .map() 函数中，它可能是这样的:

In a .map() function it could be like:

arr.map( (item, index) => { 
   let ID = "TextInput"+index
   return (
       <TextInput 
          clearTextOnFocus={true}
          keyboardType="number-pad"
          style={[this.state.FocusedItem === ID? styles.inputOnFocus : styles.input]}
          onChangeText={v=>handleInput('value',v)}
          value={this.state.value}
          onFocus={()=>this.setState({FocusedItem: ID})}
          onBlur={()=>this.setState({FocusedItem: ""})}
       />
   ) 
})

这只是为了集中注意力.如果代码保持这样，所有输入将具有相同的值

This is just for focus purpose. If the code stays like this, all inputs will have the same value

当 TextInput onFocus 和 onBlur.React-Native 时更改样式

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