IOS development uses JavaScript to invoke the OC method rather than Url_ios

First look at how to click a button on the project WebView, you can reach the calling OC code

The above page is nested inside the webview of a project page, print order after clicking (Click event is a JS method), need to call the OC inside the integrated Bluetooth printer function, to complete the printing.

So here you can only use the JS code to invoke the OC code directly .

1. First create an iOS class, because here generally need to do a set of Andro, iOS end to do a set, so generally named as a difference

. h
#import <Foundation/Foundation.h>
#import <JavaScriptCore/JavaScriptCore.h>

/**
 * JS invoke the code of main OC, need to use this agreement to do
 * * *
@protocol jsobjectprotocol <JSExport>

@required
#pragma Mark-js invokes the OC method and prints the jsonstring out
-(void) Print: (NSString *) jsonstring;

@end


@interface ios:nsobject<jsobjectprotocol>



@end

. m

@implementation IOS


#pragma mark-print jsonstring
-(void) Print: (NSString *) jsonstring{

  // Printed Specific Events
}

2. Call registered iOS registration after the end of the page loading

#pragma mark-the Web page is loaded, the iOS object is registered, and the printer is automatically checked for automatic connection
-(void) Webviewdidfinishload: (UIWebView *) webview{

  // First create the Jscontext object (where the current WebView key gets to the Jscontext)
  //The object must be created, otherwise it will not be able to invoke the method in the protocol
  iOS *ios = [[IOS alloc] init];

  Jscontext *context = [Self.webview valueforkeypath:@ "DocumentView.webView.mainFrame.javaScriptContext"];

  context[@ "ios"] = iOS;

}

3. In the JS Click event similar to the following call can be (the following code written in the corresponding JS code inside, rather than your OC code inside)

 if (window["Android"] && window["Android" ["Jsprint"]) {
  var andprint = window. Android.jsprint (Json.stringify (d));
 } else if (window["ios"] && window["ios" ["print"]) {

   window["ios"] ["print"] (json.stringify (d));

} else {
   This.alert.autoCloseTip ("Print method not Found!", 1000);
 }

This is all about how iOS uses JavaScript code to invoke the entire contents of the OC method, and hopefully it will help you learn about iOS development. I hope you will support the cloud-dwelling community.