angularjs中视图中的值更新问题

Question

SolarTerms.controller('FooterCtrl', ['$state', '$rootScope', '$scope', function ($state, $rootScope, $scope) {

$scope.imgsrc = {
    "imda1":"img/icon1.png",
    "imda2":"img/icon2.png",
    "imda3":"img/icon3.png",
    "imda4":"img/icon4.png",
    "imda5":"img/icon5.png"
}

}])

SolarTerms.directive("tabImg",function () {

    return {
        restrict:'A',
        scope:false,
        link:function (scope,ele,attr,ctrl) {
            ele.bind('click',function (event) {
                var index = $(this).index();
                scope.imgsrc = {
                    "imda1":"img/icon1.png",
                    "imda2":"img/icon2.png",
                    "imda3":"img/icon3.png",
                    "imda4":"img/icon4.png",
                    "imda5":"img/icon5.png"
                };
                scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png';
                //scope.$apply(scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png')
            })
        }
    }
})

<div tab-img class="I_AF_div" ng-click="goto('index')"><img ng-src="{{imgsrc.imda1}}" alt=""><span>首页</span></div>
<div tab-img class="I_AF_div" ng-click="goto('ye')"><img ng-src="{{imgsrc.imda2}}" alt=""><span>余额</span></div>
<div tab-img class="I_AF_div" ng-click="goto('js')"><img ng-src="{{imgsrc.imda3}}" alt=""><span>计算</span></div>
<div tab-img class="I_AF_div" ng-click="goto('ck')"><img ng-src="{{imgsrc.imda4}}" alt=""><span>查看</span></div>
<div tab-img class="I_AF_div" ng-click="goto('wd')"><img ng-src="{{imgsrc.imda5}}" alt=""><span>文档</span></div>

点击相应的div之后获取索引，然后更改$scope.imgsrc中相应的值，控制台能正确输出图片地址，但是视图中ng-src中的值为什么需要点击两次才能改变，我只是想更改ng-src中的图片地址，刚开始学angularjs，谁帮我解释下，谢谢。

Answer 1

需要手动触发angular的渲染机制

 link:function (scope,ele,attr,ctrl, $timeout) {
            ele.bind('click',function (event) {
                var index = $(this).index();
                scope.imgsrc = {
                    "imda1":"img/icon1.png",
                    "imda2":"img/icon2.png",
                    "imda3":"img/icon3.png",
                    "imda4":"img/icon4.png",
                    "imda5":"img/icon5.png"
                };
                
                $timeout(function() {
                    scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png';
                    //scope.$apply(scope.imgsrc['imda'+(index+1)] = 'img/icon'+(index+1)+'1.png')
                })
                
            })
        }