在状态变化时不响应重新渲染

我点击按钮时渲染一个新窗体。所以基本上我从组件中更改状态：在状态变化时不响应重新渲染

假为真或空真

然而，令人奇怪的状态改变后，该组件没有重新渲染

export default class BoardManager extends React.Component{ 
    constructor(){ 
    super(); 
    this.state = { 
     newForm : null 
    }; 
    setTimeout(() => { 
     this.state = { 
     newForm : true 
     }; 
     console.log(this.state.newForm); 
    },1000); 
    } 

    render(){ 
    return(
     <div> 
     Some thing here 
     {this.state.newForm ? <NewBoardForm />: null} 
     </div> 
    ) 
    } 
}

非常感谢！

编辑!!!解决方案

export default class BoardManager extends React.Component{ 
    constructor(){ 
    super(); 
    this.state = { 
     newForm : null 
    }; 
    } 

    render(){ 
    return(
     <div> 
     <BoardsTable boards={BoardData.boards}/> 
     <button onClick={() => { 
      this.setState({ 
       newForm : true 
      }); 
      console.log(this.state.newForm); 
      }}>Add New</button> 
      <button onClick={() => { 
       this.setState({ 
       newForm : null 
       }); 
       console.log(this.state.newForm); 
      }}>Delete</button> 
     {this.state.newForm ? <NewBoardForm />: null} 
     </div> 
    ) 
    } 
}

来源

2015-08-26 max_new