How can the controller and lifecycle methods be extended in UI5?

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To extend the controller and lifecycle methods in UI5, you can follow these steps:

1. Create a new JavaScript file for your extension code and add it to your project.

2. In your extension code, define your custom controller extension that extends the original controller.

sap.ui.define([
  "sap/ui/core/mvc/Controller"
], function(Controller) {
  "use strict";

  return Controller.extend("my.app.controller.CustomController", {
    // Define your custom methods here
    onBeforeRendering: function() {
      // Call the original onBeforeRendering method
      Controller.prototype.onBeforeRendering.apply(this, arguments);

      // Add your own logic here
    },

    onAfterRendering: function() {
      // Call the original onAfterRendering method
      Controller.prototype.onAfterRendering.apply(this, arguments);

      // Add your own logic here
    }
  });
});

1. In your view XML file, add a reference to your custom controller extension by specifying the controller name.

<mvc:View xmlns:mvc="sap.ui.core.mvc"
  xmlns="sap.m"
  controllerName="my.app.controller.CustomController">
  <!-- Your view content here -->
</mvc:View>

1. In your application code, instantiate the view as usual.

sap.ui.define([
  "sap/ui/core/mvc/XMLView"
], function(XMLView) {
  "use strict";

  // Instantiate the view
  XMLView.create({
    viewName: "my.app.view.MyView",
    // Add additional parameters here if needed
  }).then(function(view) {
    // Add the view to the DOM
    view.placeAt("content");
  });
});

With these steps, you have extended the controller and lifecycle methods of your UI5 view. You can add additional custom methods and override other methods as needed.