ProgressBar不适用于fxml文件和控制器 [英] ProgressBar doesn't work with a fxml file and a controller

问题描述

所以我使用这个链接来设置我的进度条和当我运行这段代码时它运行得很好。

So I used this link to set up my progress bar and it worked perfectly fine when I ran this code.

但是，通过我的设置，我似乎无法获得进度条来实际更新... progressBar .getProgress（）实际上获得了正确的进度，但UI没有更新。这是迄今为止的代码：

However, with the setup that I have, I can't seem to get the progressbar to actually update... progressBar.getProgress() actually gets the right progress but the UI isn't updated. Here's the code so far:

Main.java

Main.java

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            FXMLLoader loader = new FXMLLoader(Main.class.getResource("ProgressBarLayout.fxml"));
            AnchorPane root = (AnchorPane) loader.load();
            Scene scene = new Scene(root);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

ProgressBarController.java

ProgressBarController.java

public class ProgressBarController {
    private Task copyWorker;

    @FXML
    private ProgressBar progressBar;

    @FXML
    private void onButtonClick() {
        progressBar = new ProgressBar(0);
         progressBar.setProgress(0);
         copyWorker = createWorker();

         progressBar.progressProperty().unbind();
         progressBar.progressProperty().bind(copyWorker.progressProperty());

         new Thread(copyWorker).start();
    }


    public Task createWorker() {
        return new Task() {
            @Override
            protected Object call() throws Exception {
                for (int i = 0; i < 10; i++) {
                    Thread.sleep(2000);
                    updateMessage("2000 milliseconds");
                    updateProgress(i + 1, 10);

                    System.out.println(progressBar.getProgress());
                }
                return true;
            }
        };
    }
}

ProgressBarLayout.fxml

ProgressBarLayout.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="257.0" prefWidth="434.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.ProgressBarController">
   <children>
      <ProgressBar fx:id="progressBar" layoutX="54.0" layoutY="103.0" prefHeight="51.0" prefWidth="326.0" progress="0.0" />
      <Button layoutX="201.0" layoutY="182.0" mnemonicParsing="false" onAction="#onButtonClick" text="OK" />
   </children>
</AnchorPane>

推荐答案

：

    progressBar = new ProgressBar(0);

这意味着它将创建一个新的ProgressBar实例，它将不再使用你的FXML中的progressBar 。
只需删除此行，它就可以正常工作

this mean it will create a new instance of ProgressBar and it will not use your progressBar from your FXML anymore. Just remove this line, it should works

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