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从UIWebView W / Swift将多个Div元素的属性获取到我的iOS应用中

[英]Get Attribute From Multiple Div Elements into my iOS app from UIWebView W/Swift

如何从UIWebView中定义的div元素获取属性到iOS应用程序?

为了进一步解释...

我有一个非常简单的HTML文档,我将其加载到UIWebView中。 它允许用户单击以打开或关闭按钮。 我将div上的属性设置为true或false。 请参阅下面的代码。

<html>
<head>
    <title>Tire Selection Template</title>
    <style>
        .front_truck_box{
            display:flex;
            flex-wrap: wrap;
            border:1px solid black;
            height:80px;
            flex: 0 1 80px;
            padding:10px;
        }
        .middle_truck_box, .back_truck_box {
            display:flex;
            flex-wrap: wrap;
            border:1px solid black;
            height:80px;
            flex: 1 1 120px;
            max-width:250px;
            padding:10px;
        }
        .wrapper{
            display:flex;
            flex-direction: row;
            flex-wrap: nowrap;
            align-items:center;
            justify-content: center;
        }
        .tire_box{
            flex: 0 0 10px;
            height:30px;
            width:10px;
            border:1px solid black;
            cursor:pointer;
        }
        .tire_set{
            display: flex;
            flex: 0 0 35px;
            justify-content: space-around;
        }
        .front_tire_set{
            display:flex;
            flex: 0 1 100%;
            justify-content: space-around;
        }
        .first_row,.second_row{
            display:flex;
            flex: 1 0 100%;
            flex-direction: row;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-around;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="front_truck_box">
            <div class="first_row">
                <div class="front_tire_set">
                    <div class="tire_box" tire="1" active="false"></div>
                    <div class="tire_box" tire="2" active="false"></div>
                </div>
            </div>
            <div class="second_row">
                <div class="front_tire_set">
                    <div class="tire_box" tire="3" active="false"></div>
                    <div class="tire_box" tire="4" active="false"></div>
                </div>
            </div>
        </div>
        <div class="middle_truck_box">
            <div class="first_row">
                <div class="tire_set">
                    <div class="tire_box" tire="5" active="false"></div>
                    <div class="tire_box" tire="6" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="7" active="false"></div>
                    <div class="tire_box" tire="8" active="false"></div>
                </div>
            </div>
            <div class="second_row">
                <div class="tire_set">
                    <div class="tire_box" tire="9" active="false"></div>
                    <div class="tire_box" tire="10" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="11" active="false"></div>
                    <div class="tire_box" tire="12" active="false"></div>
                </div>
            </div>
        </div>
        <div class="back_truck_box">
            <div class="first_row">
                <div class="tire_set">
                    <div class="tire_box" tire="13" active="false"></div>
                    <div class="tire_box" tire="14" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="15" active="false"></div>
                    <div class="tire_box" tire="16" active="false"></div>
                </div>
            </div>
            <div class="second_row">
                <div class="tire_set">
                    <div class="tire_box" tire="17" active="false"></div>
                    <div class="tire_box" tire="18" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="19" active="false"></div>
                    <div class="tire_box" tire="20" active="false"></div>
                </div>
            </div>
        </div>
    </div>
    <script   src="https://code.jquery.com/jquery-2.2.3.min.js"   integrity="sha256-a23g1Nt4dtEYOj7bR+vTu7+T8VP13humZFBJNIYoEJo="   crossorigin="anonymous"></script>
    <script>
        $(document).ready(function(){
            $(".wrapper").on('click', '.tire_box', function() {
                var tire = $(this).attr("tire");
                var active = $(this).attr("active");
                console.log(active);
                //console.log(tire);
                if( active == "false"){
                    $(this).css("background-color","black");
                    $(this).attr("active","true");
                }else{
                    $(this).css("background-color","white");
                    $(this).attr("active","false");
                }
            });

            function test(){
                return "test"
            }
        });
    </script>
</body>
</html>

您可以在这里查看其运行情况: https : //jsfiddle.net/x11joex11/0d92ao80/1/

我知道下面的代码行很快。

theWebView.stringByEvaluatingJavaScriptFromString("document.documentElement.outerHTML")

该行将返回所有HTML。 现在我也许可以分析一下,但是我想应该有可能,因为我正在使用jquery运行命令来获取所有被单击的框。 单击每个框后,我将其“活动”属性更改为“真”或“假”。 我该怎么做呢?

例如,返回一个在单击的每个div (.tire_box)具有“轮胎”属性值的数组“ active = true” )。

使用jQuery(因为我的HTML上有它)或Javascript的答案是可以的。 只是不确定要在stringByEvaluatingJavascriptFromString()函数中放入什么

更新::

使用此命令,我能够从一个轮胎中获得价值。

document.getElementsByClassName('tire_box')[0].getAttribute('tire')

我需要能够选择轮胎列表,并以某种方式快速地对其进行处理。 尚不确定执行此操作的最佳方法...

有趣的是,我似乎能够运行jQuery代码。 我在javascript外部的变量中创建了函数test(),并在html中添加了alert('test')并运行了此代码...

我运行的Swift Javascript

$(document).ready(function(){
    test();
});

在document.ready()外部添加到HTML

var test = function(){
            alert("test function ran");
            return "test";
        };

在stringByEvaluatingJavaScriptFromString函数上,它调用了警报,但是我似乎没有从stringByEvaluatingJavaScriptFromString函数得到任何结果...只是空白?

我想知道函数“如何”返回javascript,我必须在javascript命令中做什么才能使其返回某些信息?

经过大量研究,我终于找到了答案。 事实证明,stringByEvaluatingJavaScriptFromString将返回要运行的LAST语句的结果。

也就是说,我在下面修改了我的html。

<html>
<head>
    <title>Tire Selection Template</title>
    <style>
        .front_truck_box{
            display:flex;
            flex-wrap: wrap;
            border:1px solid black;
            height:80px;
            flex: 0 1 80px;
            padding:10px;
        }
        .middle_truck_box, .back_truck_box {
            display:flex;
            flex-wrap: wrap;
            border:1px solid black;
            height:80px;
            flex: 1 1 120px;
            max-width:250px;
            padding:10px;
        }
        .wrapper{
            display:flex;
            flex-direction: row;
            flex-wrap: nowrap;
            align-items:center;
            justify-content: center;
        }
        .tire_box{
            flex: 0 0 10px;
            height:30px;
            width:10px;
            border:1px solid black;
            cursor:pointer;
        }
        .tire_set{
            display: flex;
            flex: 0 0 35px;
            justify-content: space-around;
        }
        .front_tire_set{
            display:flex;
            flex: 0 1 100%;
            justify-content: space-around;
        }
        .first_row,.second_row{
            display:flex;
            flex: 1 0 100%;
            flex-direction: row;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-around;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="front_truck_box">
            <div class="first_row">
                <div class="front_tire_set">
                    <div class="tire_box" tire="1" active="false"></div>
                    <div class="tire_box" tire="2" active="false"></div>
                </div>
            </div>
            <div class="second_row">
                <div class="front_tire_set">
                    <div class="tire_box" tire="3" active="false"></div>
                    <div class="tire_box" tire="4" active="false"></div>
                </div>
            </div>
        </div>
        <div class="middle_truck_box">
            <div class="first_row">
                <div class="tire_set">
                    <div class="tire_box" tire="5" active="false"></div>
                    <div class="tire_box" tire="6" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="7" active="false"></div>
                    <div class="tire_box" tire="8" active="false"></div>
                </div>
            </div>
            <div class="second_row">
                <div class="tire_set">
                    <div class="tire_box" tire="9" active="false"></div>
                    <div class="tire_box" tire="10" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="11" active="false"></div>
                    <div class="tire_box" tire="12" active="false"></div>
                </div>
            </div>
        </div>
        <div class="back_truck_box">
            <div class="first_row">
                <div class="tire_set">
                    <div class="tire_box" tire="13" active="false"></div>
                    <div class="tire_box" tire="14" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="15" active="false"></div>
                    <div class="tire_box" tire="16" active="false"></div>
                </div>
            </div>
            <div class="second_row">
                <div class="tire_set">
                    <div class="tire_box" tire="17" active="false"></div>
                    <div class="tire_box" tire="18" active="false"></div>
                </div>
                <div class="tire_set">
                    <div class="tire_box" tire="19" active="false"></div>
                    <div class="tire_box" tire="20" active="false"></div>
                </div>
            </div>
        </div>
    </div>
    <script   src="https://code.jquery.com/jquery-2.2.3.min.js"   integrity="sha256-a23g1Nt4dtEYOj7bR+vTu7+T8VP13humZFBJNIYoEJo="   crossorigin="anonymous"></script>
    <script>
        var returnToIOS = function(){

            //Calculate which tires are 'active=true' and 'active=false' to the array.
            var tires = [];
            var tireObj = {};

            $(".tire_box").each(function(index){
                tireObj = {};//create new object.
                tireObj["number"] = $(this).attr("tire");
                tireObj["active"] = $(this).attr("active");
                tires.push(tireObj);//add to our tire array the object.
            });

            var jsonString = JSON.stringify(tires);
            return jsonString;
        };
        $(document).ready(function(){
            $(".wrapper").on('click', '.tire_box', function() {
                var tire = $(this).attr("tire");
                var active = $(this).attr("active");

                if( active == "false"){
                    $(this).css("background-color","black");
                    $(this).attr("active","true");
                }else{
                    $(this).css("background-color","white");
                    $(this).attr("active","false");
                }
            });
        });
    </script>
</body>
</html>

注意函数returnToIOS 我做到了,所以它将返回一个JSON字符串,其中包含我想要的模板数据。

接下来在Swift中,我执行了以下代码。

let javascript = "returnToIOS();"
let value = self.theWebView.stringByEvaluatingJavaScriptFromString(javascript)

这将返回带有所有数据的JSON字符串!

为了使它变得更好,我在我的iOS项目中包括了一个名为Swift Json( https://github.com/dankogai/swift-json/ )的库。

然后,我运行这些命令。

let data = value!.dataUsingEncoding(NSUTF8StringEncoding)

                let json = JSON(data:data!)

                for tires in json.asArray! {
                    print(tires["number"].asString!+" : "+tires["active"].asString!)
                }

和Wah La,我所有的数据都放在一个可以处理的漂亮数组中!

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