//在使用到js交互的控制器里面 要导入 JavaScriptCore

import JavaScriptCore


在UIWebViewDelegate 的代理方法里面写如下

func webViewDidFinishLoad(webView: UIWebView) {

let  context = webView.valueForKeyPath("documentView.webView.mainFrame.javaScriptContext")as!JSContext

jsContext = context

js端调用本地方法 这里用block来实现

let someMethon: @convention(block) AnyObject -> AnyObject = { obj in

print(obj)

return ""

}

jsContext!.setObject(unsafeBitCast(someMethon, AnyObject.self), forKeyedSubscript: "someMethon")

}