将变量从Swift传递到javascript函数

Question

使用JSContext将变量传递给javascript函数时遇到问题。 错误显示stringToSend未定义：

func sendSomething(stringToSend : String) {
        appController?.evaluateInJavaScriptContext({ (context) -> Void in
            context.evaluateScript("myJSFunction(stringToSend)")
            }, completion: { (evaluated) -> Void in
                print("we have completed: \(evaluated)")
        })
    }

Answer 1

这是我喜欢从Swift到Javascript交流的方式：

func sendSomething(stringToSend : String) {
    appController?.evaluateInJavaScriptContext({ (context) -> Void in

       //Get a reference to the "myJSFunction" method that you've implemented in JavaScript
       let myJSFunction = evaluation.objectForKeyedSubscript("myJSFunction")

       //Call your JavaScript method with an array of arguments
       myJSFunction.callWithArguments([stringToSend])

       }, completion: { (evaluated) -> Void in
          print("we have completed: \(evaluated)")
    })
}

调用此方法时，请确保在您的JavaScript上下文中实现了myJSFunction 。

使用callWithArguments时，您的stringToSend字符串将自动映射到javascript字符串。

Answer 2

字符串需要Swift的String Interpolation ，加上额外的引号，如下所示：

func sendSomething(stringToSend : String) {
        appController?.evaluateInJavaScriptContext({ (context) -> Void in
            context.evaluateScript("myJSFunction('\(stringToSend)')")
            }, completion: { (evaluated) -> Void in
                print("we have completed: \(evaluated)")
        })
    }