IOS: listening for JavaScript events (JavaScript communicating back with objective-C Code) in object-C)

In objective-C interaction between iOS development and JavaScript, we can useStringbyevaluatingjavascriptfromstring to obtain relevant node attributes in obj-C and add JavascriptCode. But how can we monitorWhat about JavaScript response events. Effective API implementation in Mac OS, But iPhone does not, but we have a way to do this:

The general idea is to setDocument. LocationThis will lead to a delegate method of webview, so as to achieve the effect of sending notifications, that is, to achieve the purpose of listening.

1. Define a protocol agreement between JavaScript and webview:

MyApp: myfunction: myparam1: myparam2

2. Add code in javascript:

 
Document. Location = "MyApp:" + "myfunction:" + param1 + ":" + param2;
 

3. Delegate method in webviewWebview: shouldstartloadwithrequest: navigationtype:Add

-(Bool) webview :( uiwebview * ) Webview2 shouldstartloadwithrequest :( nsurlrequest * ) Request navigationtype :( uiwebviewnavigationtype) navigationtype {nsstring * Requeststring = [[Request URL] absolutestring]; nsarray * Components = [requeststring componentsseparatedbystring: @"  :  "  ];  If ([Components count]>1 && [(Nsstring *) [Components objectatindex: 0 ] Isequaltostring: @"  MyApp  "  ]) {  If ([(Nsstring *) [components objectatindex: 1 ] Isequaltostring: @"  Myfunction  "  ]) {Nslog ([components objectatindex: 2 ]); //  Param1 Nslog ([components objectatindex: 3 ]); //  Param2  //  Call your method in objective-C method using the above...  }  Return  No ;}  Return Yes; // Return YES to make sure regular navigation works as expected. }

 

 

Check: http://stackoverflow.com/questions/5671742/send-a-notification-from-javascript-in-uiwebview-to-objectivec

Http://www.codingventures.com/2008/12/using-uiwebview-to-render-svg-files/