[OpenUI5] 复习Controller lifecycle

昨天看到有同事添加了几个Controller的回调，对其中的onBeforeExit、beforeExit没一点印象。

sap.ui.controller("kx123.foo", {
    onInit: function () {
        console.info("foo onInit called");
    },
    onBeforeExit: function(){
          console.info("foo onBeforeExit called") ;
    } ,
    beforeExit: function() {
         console.info("foo beforeExit called") ;
    },
    onBeforeRendering: function() {
        console.info("foo onBeforeRendering called");
    },
    onExit: function() {
        console.info("foo onExit called");
    }
});

查了一下如下OpenUI5开发指南 MVC中关于Controllers的介绍。

SAPUI5 provides predefined lifecycle hooks forimplementation. You can add event handlers or other functions tothe controller and the controller can fire events, for which othercontrollers or entities can register. SAPUI5 provides the following lifecyclehooks:

• onInit(): Called when a view is instantiated and its controls(if available) have already been created; used to modify the viewbefore it is displayed to bind event handlers and do other one-timeinitialization
• onExit(): Called when the view is destroyed; used to freeresources and finalize activities
• onAfterRendering(): Called when the view has been rendered and,therefore, its HTML is part of the document; used to dopost-rendering manipulations of theHTML. SAPUI5 controls get thishook after being rendered.
• onBeforeRendering(): Invoked before the controller view isre-renderedand not beforethe first rendering;use onInit() for invoking thehook before the first rendering

看来sap.ui.controller确实不存在onBeforeExit、beforeExit回调。倒是sap.ui.core.mvc.View有beforeExit事件，它跟sap.ui.controller的onExit回调是捆一起的。