从Apple TV TVML TVJS JavaScript应用程序调用Swift代码 [英] Call Swift code from an Apple TV TVML TVJS JavaScript App

问题描述

我已经设置了基本的TVML应用程序.当前，简单事件(例如按钮按下)是通过JavaScript(TVJS)处理的.

I have a basic TVML application set up. Currently simple events (such as a button press) are handled via JavaScript (TVJS).

当用户按下按钮(通过TVML模板提供)时，我希望一些代码可以在Swift中运行，从而操纵UI元素.

When the user presses a button (provided via TVML template) I'd like some code to run in Swift instead, that manipulates UI elements.

做到这一点的最佳方法是什么?

What's the best way to do this?

推荐答案

您可以按以下方式在TVApplicationControllerDelegate中使用EvaluationAppJavaScriptIn方法，并在其中编写相应的swift方法； (敏捷的一面)

You can use evaluateAppJavaScriptIn method in TVApplicationControllerDelegate as below and write corresponding swift method in it; (swift side)

// MARK: TVApplicationControllerDelegate
func appController(_ appController: TVApplicationController, evaluateAppJavaScriptIn jsContext: JSContext){
    let debug : @convention(block) (String!) -> Void = {
        (string : String!) -> Void in
        #if DEBUG
            print("[log]: \(string!)\n")
        #endif
    }
    jsContext.setObject(unsafeBitCast(debug, to: AnyObject.self), forKeyedSubscript: "debug" as (NSCopying & NSObjectProtocol)!)
}

之后，您可以像这样从TVJS调用此方法； (js端)

After that you can call this method from TVJS like this; (js side)

debug('Hello from js to swift...');

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