iOS:JS对象转换为Dictionary/NSDictionary对象

前言

项目中目前实现了通过动态下载资源包来替换widget皮肤的功能,资源包中包括js代码文件和资源图片. js文件编写比较简单,简单初始化了对象,并把布局信息写入对象中, 客户端解析js成数据model,根据数据model展示布局.

这样做的好处首先替换widget皮肤不用发版,其次上新皮肤的时候只需要客户端开发人员拿到资源图片之后编写js文件就可以实现布局,服务端只需要提供上传和下载资源包的接口,不用每次更新widget都在接口中下发布局信息.

简单贴部分代码

test.js代码

var viewJson = function() {
    //定义输出对象
    var resultWidget = new Object();
    resultWidget.widget_type = 1;
    resultWidget.background_type = 1; 
    resultWidget.width = 320;
    resultWidget.height = 500;
    resultWidget.imageName = "widget_bg.png"

    var testItem1 = new Object();
    testItem1.id = 1;
    testItem1.name = "item1";
    testItem1.imageName = "item1.png";

    var testItem2 = new Object();
    testItem2.id = 2;
    testItem2.name = "item2";
    testItem2.imageName = "item2.png";
    
    resultWidget.Items = [testItem1, testItem2];

    return JSON.stringify(resultWidget);
};

swift代码:

//获取js文件路径
let jsPathString = "TempFiles/test.js"
let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let fileURL = dir?.appendingPathComponent(jsPathString)

//创建JSContext对象
var jsContext = JSContext.init();
do {
    //读取js代码
    let jsString = try String(contentsOf: fileURL!, encoding: .utf8)
    //解析JS代码
    _ = jsContext?.evaluateScript(jsString)
    //根据js变量名,获取viewJson字段
    let result = jsContext?.objectForKeyedSubscript("viewJson")
    let resultJson = result?.call(withArguments: nil).toString()
    let resultData = resultJson?.data(using: .utf8)
    //转换为字典格式
    let resultDict = try JSONSerialization.jsonObject(with: resultData!, options: .allowFragments) as? Dictionary<String, Any>
    print(resultDict ?? 0);
}
catch {
    
}

OC代码:

JSContext *context = [[JSContext alloc]init];
NSString *js = [NSString stringWithContentsOfFile:jsPath encoding:NSUTF8StringEncoding error:nil];
[context evaluateScript:js];
//根据js变量名,获取viewJson字段
JSValue *jsValue = context[@"viewJson"];
JSValue *loadingJson = [jsValue callWithArguments:nil];
NSString *resultJson = [loadingJson toString];
NSData *jsonData = [resultJson dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:nil];
NSLog(@"%@", dic);