将多个 Div 元素的属性从 UIWebView W/Swift 获取到我的 iOS 应用程序

Question

如何从我的 UIWebView 中定义的 div 元素获取属性到我的 iOS 应用程序中？

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。参考我下面的代码。

<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>

您可以在此处查看实际效果：https://jsfiddle.net/x11joex11/0d92ao80/1/

我知道 swift 中的以下代码行。

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

此行将 return 所有 HTML。现在我也许可以通过这个并解析，但我认为这应该是可能的，因为我正在使用 jquery 到运行一个命令来获取所有被点击的框。单击每个框时，我将其 'active' 属性更改为 "true" 或 "false"。 我该怎么做？

例如return使用 "tire" 属性值的数组我在每个 div 上有 ( .tire_box) 即被点击 ("active=true").

使用 jQuery（因为我的 HTML 上有）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::

我能够使用此命令从轮胎的 'one' 中获取值。

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

我需要能够获取所选轮胎的列表并以某种方式在 swift 中对其进行处理。还不确定最好的方法...

有趣的是我似乎能够运行 jQuery 编码。我在 javascript 之外的变量中创建了一个函数 test() ，在我的 html 和运行中有一个 alert('test') 代码...

SwiftJavascript我运行

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

添加到 HTML 外 document.ready()

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

在 stringByEvaluatingJavaScriptFromString 函数上它调用了警报，但我似乎没有从 stringByEvaluatingJavaScriptFromString 函数返回任何结果...只是空白？

我想知道 'how' 函数 return 是 javascript 以及我必须在 javascript 命令中做什么才能使其成为 return什么东西？

Answer 1

经过大量研究，我终于找到了答案。结果是 stringByEvaluatingJavaScriptFromString 将 return LAST 语句的结果为运行.

也就是说我修改了下面的 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。我这样做是为了 return 一个 JSON 字符串，其中包含我想要从模板中获取的数据。

下一步 Swift 我做了以下代码。

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

这将 return 包含所有数据的 JSON 字符串！

为了让它变得更好，我在我的 iOS 项目中加入了一个名为 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!)
                }

Wha La 我将所有数据都放在一个很好的数组中，我可以用它来操作！

将多个 Div 元素的属性从 UIWebView W/Swift 获取到我的 iOS 应用程序

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

javascript

uiwebview

stringbyevaluatingjavascr

ios

swift