SAPUI5 View Controller lifecycle methods

Create an Application Project for SAPUI5

关上 Eclipse 并转到菜单选项，文件 -> 新建 -> 其余...。在 New 窗口中，关上节点 SAPUI5 Application Development 并抉择 Application Project 选项。单击下一步按钮。

为我的项目提供一个名称。咱们称之为 UI5LifecycleDemo。抉择库 sap.ui.commons 并选中 Create an Initial View 选项。单击下一步按钮。

在下一个窗口中，为视图提供一个名称。咱们称其为次要的。抉择开发范式作为 JavaScript。这将在 JavaScript 中创立一个视图。单击实现按钮。

创立好的 SAP UI5 我的项目层级构造如下：

Write View Logic

main.view.js 的内容：

sap.ui.jsview("ui5lifecycledemo.main", {    /** Specifies the Controller belonging to this View.     * In the case that it is not implemented, or that "null" is returned,        * this View does not have a Controller.    * @memberOf ui5lifecycledemo.main    */     getControllerName : function() {        return "ui5lifecycledemo.main";    },    /** Is initially called once after the Controller has been instantiated.         * It is the place where the UI is constructed.     * Since the Controller is given to this method, its event handlers can         * be attached right away.     * @memberOf ui5lifecycledemo.main    */     createContent : function(oController) {        console.log("createContent() of main view called...");                // Create a Panel object         var mainPanel = new sap.ui.commons.Panel("mainPanel");                // Create a Button object        var exitButton = new sap.ui.commons.Button({            id : "exitButton", // sap.ui.core.ID            text : 'Exit and kill controller', // string            press : [ function(oEvent) {                        // Commit suicide                this.destroy();                                // Let the world know about it                alert("View and Controller destroyed...");                            }, this ]        });                        // Add the button to the main panel        mainPanel.addContent(exitButton);                return mainPanel;            }});

Write Controller Logic

关上 main.controller.js 文件。勾销所有钩子办法的正文；控制器的 onInit、onBeforeRendering、onAfterRendering 和 onExit 并将以下代码写入所有办法的主体中。

sap.ui.controller("ui5lifecycledemo.main", {/*** Called when a controller is instantiated and its View controls (if available) * are already created.* Can be used to modify the View before it is displayed, to bind event handlers * and do other one-time initialization.* @memberOf ui5lifecycledemo.main*/    onInit: function() {        console.log("onInit() of controller called...");    },/*** Similar to onAfterRendering, but this hook is invoked before the controller's * View is re-rendered* (NOT before the first rendering! onInit() is used for that one!).* @memberOf ui5lifecycledemo.main*/    onBeforeRendering: function() {        console.log("onBeforeRendering() of controller called...");    },/*** Called when the View has been rendered (so its HTML is part of the document). * Post-rendering manipulations of the HTML could be done here.* This hook is the same one that SAPUI5 controls get after being rendered.* @memberOf ui5lifecycledemo.main*/    onAfterRendering: function() {        console.log("onAfterRendering() of controller called...");    },/*** Called when the Controller is destroyed. Use this one to free resources * and finalize activities.* @memberOf ui5lifecycledemo.main*/    onExit: function() {        console.log("onExit() of controller called...");    }});

Deploy and Run Application

启动服务器并部署应用程序。关上一个新的浏览器窗口（本示例应用 Chrome 浏览器）并关上开发者工具：

而后在浏览器中关上如下网址 http://localhost:8088/UI5Life...
请依据您的服务器配置应用端口号。

加载 index.html 将在开发者工具控制台中打印日志。能够看到首先调用视图的createContent()办法，而后是onInit()、onBeforeRendering()，最初是控制器的onAfterRendering()办法。这些办法的目标在它们下面的正文中有很好的记录。因而，我不具体探讨它们的目标。

当初，单击退出并终止控制器按钮。这将调用视图上的 destroy() 办法。destroy() 办法革除与视图及其子元素关联的所有资源。因而，与视图关联的控制器也被销毁，因而它的 onExit() 办法被调用。

更多Jerry的原创文章，尽在："汪子熙":