javafx-settext（）不起作用

Question

我无法设置TextField的文本。没有错误，但Textfield仍然为空。程序的其余部分正在工作，方法被调用，system.out.println（...）打印正确的文本。所以问题是，不能设置textfield的文本。即使我只是写textfield.settext（“0”）；textfield仍然为空。当我在public void initialize（...）下为textfield设置文本时也管用。那么为什么它在SetCurrentInfo中不起作用呢？

@FXML
private TextField textField;

private Info currentInfo;

 @Override
public void initialize(URL url, ResourceBundle rb) {
}   

public void setCurrentInfo(Info currentInfo) {
    textField.setText(currentInfo.getpw1());
    System.out.println(currentInfo.getpw1());
    this.currentInfo = currentInfo;
}

控制器中调用setCurrentInfo的部分：

@FXML
private void handleBtn1(ActionEvent event) throws Exception{
    Info info = new Info(textFieldA.getText(), textFieldB.getText());
    FXMLLoader loader = new FXMLLoader();
    loader.setLocation(getClass().getResource("FXMLPassword.fxml"));
    loader.load();
    Stage stage; 
    Parent root;
    if(event.getSource()==btn1){
        //get reference to the button's stage         
        stage=(Stage) btn1.getScene().getWindow();
        //load up OTHER FXML document
        root = FXMLLoader.load(getClass().getResource("FXMLPassword.fxml"));
    }
    else{
        stage=(Stage) btn1.getScene().getWindow();
        root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
    }
    //create a new scene with root and set the stage
    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
    FXMLPasswordController passwordController = loader.getController();
    passwordController.setCurrentInfo(info);
    }

Answer 1

您正在从错误的FXMLLoader检索控制器。特别是，您需要：

FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("FXMLPassword.fxml"));
loader.load();

然后后来

FXMLPasswordController passwordController = loader.getController();

在此代码中，创建FXMLLoader并将其指向FXMLPassword.fxml文件。但是当调用loader.load()读取fxml文件并创建其中定义的UI时，对结果什么也不做。因此，调用loader.load()创建的UI永远不会显示。

root = FXMLLoader.load(getClass().getResource("FXMLPassword.fxml"));

@FXML
private void handleBtn1(ActionEvent event) throws Exception{
    Info info = new Info(textFieldA.getText(), textFieldB.getText());
    Stage stage; 
    Parent root;
    if(event.getSource()==btn1){
        //get reference to the button's stage         
        stage=(Stage) btn1.getScene().getWindow();
        //load up OTHER FXML document
        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(getClass().getResource("FXMLPassword.fxml"));
        root = loader.load();
        FXMLPasswordController passwordController = loader.getController();
        passwordController.setCurrentInfo(info);
    }
    else{
        stage=(Stage) btn1.getScene().getWindow();
        root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
    }
    //create a new scene with root and set the stage
    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}