Swift:如何使用JavascriptCore调用加载文件中的函数

Similar to a regular js file that starts with referenced external query and then your js custom code, I need to do the same in Swift using JavascriptCore.

类似于从引用外部查询开始的普通js文件，然后是js自定义代码，我需要使用JavascriptCore在Swift中执行相同的操作。

I saw this Objective-C example:

我看到了Objective-C的例子

NSURL *scriptURL = [NSURL URLWithString:@"path/to/fancyLibrary.js"];
NSError *error = nil;
NSString *script = [NSString stringWithContentsOfURL:scriptURL encoding:NSUTF8StringEncoding error:&error];
[context evaluateScript:script];

It does the first part of bringing down an external js file, but I want to also add a js block calling some of the functions in that referenced file. How do I do that!? Can you do it in Swift?

它完成了取出一个外部js文件的第一部分，但是我还想添加一个js块来调用该引用文件中的一些函数。我该怎么做!?你能用斯威夫特写吗?

2 个解决方案

#1

you can just call evaluateJavascript on the webView to call functions and get information, so you can do things like:

你可以在webView上调用evaluateJavascript来调用函数并获取信息，你可以这样做:

webView.evaluateJavascript("someFuncton();") { (result, error) in
    if (!error) {
         print(result(
    }
}

webView.evaluateJavascript("document.height") { (result, error) in
    if (!error) {
         print(result(
    }
}

You can even post messages from the Javascript back to native swift functions using webKit using message hanlders. see this ref

您甚至可以使用webKit使用消息hanlders将来自Javascript的消息发送回本地swift函数。看到这个裁判

Here is an objective-c guide on sending messages both ways using Javascript

这里有一个objective-c指南，可以用Javascript来发送消息。

#2

For a complete answer, you want to: 1. inherit from WKNavigationDelegate 2. in viewDidLoad:

要得到完整的答案，你需要:1。继承WKNavigationDelegate 2。在viewDidLoad:

self.webView.navigationDelegate = self

3. and calling it in the didFinishNavigation, see this

3所示。在didFinishNavigation中调用它，看到这个

#1