How do I listen in Objective C to listen whether the javascript method is invoked?
E.g.in javascript:
<script>
function someJsFunction(){}
</script>
How do I implement a listener in objective c using UIWebView to listen to js function being invoke.
How do I used below components? UIWebView shouldStartLoadWithRequest
How do I get the inputbox value in UIWebView?
If you want to print console messages in js through objective c then you can use below code.
//fetch JSContext
//webView is object of UIWebView , in which your js files are already injected
JSContext *context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
//evaluate script on context object
[context evaluateScript:@"var console = {};"]; // make console an empty object
// when ever you use "console.log('')" in your JS it will call below block
context[@"console"][@"log"] = ^(NSString *message)
{
NSLog(@"Console msg from js:%@", message);
};
To execute js function from objective c use below code.
NSString *evalScript = [NSString stringWithFormat:@"someJSFun(%@)",param];
[context evaluateScript:evalScript];
Now if you want to call objective c function from your JS , you can use block like below.
//Suppose you want to call "someObjCFun(param)" from your js then
context[@"someObjCFun"]= ^(JSValue *message)
{
//TODO
//This block will be executed when you will call 'someObjCFun(param)' from your js
};
So if you want your textbox value in objective c , just use block like above and pass textbox value as parameter.
P.S. Your JS should be injected in UIWebView.
