fix: Crash on iOS

- crash 发生在ffi调用过程中
  flutter_js ffi 调用native JavascriptCore 机制本身是同步
  安全性考虑改为同步

Author: GH4NG

simple_live_core/lib/src/danmaku/douyin_danmaku.dart

@@ -92,12 +92,11 @@ class DouyinDanmaku implements LiveDanmaku {
 
     var url = "$uri&signature=$sign";
     var backupUrl = url.replaceAll("webcast3-ws-web-lq", "webcast5-ws-web-lf");
-    print(url);
     webScoketUtils = WebScoketUtils(
       url: url,
       backupUrl: backupUrl,
       headers: {
-        "User-Agnet": DouyinRequestParams.kDefaultUserAgent,
+        "User-Agent": DouyinRequestParams.kDefaultUserAgent,
         "Cookie": danmakuArgs.cookie,
         "Origin": "https://live.douyin.com"
       },
@@ -230,7 +229,8 @@ class DouyinDanmaku implements LiveDanmaku {
           .map((entry) => '${entry.key}=${entry.value}')
           .join(',');
       var md5SigParam = md5.convert(utf8.encode(sigParam)).toString();
-      JsEvalResult jsEvalResult = JsEngine.jsRuntime.evaluate("get_sign('$md5SigParam')");
+      JsEvalResult jsEvalResult =
+          await JsEngine.evaluateAsync("get_sign('$md5SigParam')"); // 异步执行
       return jsEvalResult.stringResult;
     } catch (e) {
       CoreLog.error(e);

simple_live_core/lib/src/douyu_site.dart

@@ -325,7 +325,8 @@ class DouyuSite implements LiveSite {
     try{
       var did = '10000000000000000000000000001501';
       JsEngine.init();
-      JsEvalResult jsEvalResult = JsEngine.jsRuntime.evaluate("$html;ub98484234();");
+      JsEvalResult jsEvalResult =
+          await JsEngine.evaluateAsync("$html;ub98484234();");
       var res = jsEvalResult.stringResult;
       String t10 = (DateTime.now().millisecondsSinceEpoch ~/ 1000).toString();
       RegExp vReg = RegExp(r'v=(\d+)');
@@ -336,9 +337,12 @@ class DouyuSite implements LiveSite {
           .replaceAll(RegExp(r'return rt;}\);?'), 'return rt;}')
           .replaceAll('(function (', 'function sign(')
           .replaceAll('CryptoJS.MD5(cb).toString()', '"$rb"');
-      final params = JsEngine.jsRuntime.evaluate("$jsSign;sign($rid,'$did',$t10);").stringResult;
-      return params;
-    }catch(e){
+
+      final params =
+          await JsEngine.evaluateAsync("$jsSign;sign($rid,'$did',$t10);");
+
+      return params.stringResult;
+    } catch (e) {
       CoreLog.error(e);
       return "";
     } finally{