iOS js with native interaction two

This article is mainly about UIWebView and JS interaction, UIWebView and JS Interactive detailed https://www.cnblogs.com/llhlj/p/6429431.html

A. Wkwebview Call JS

[WebView evaluatejavascript:@ " I am js" completionhandler:^ (ID _nullable response, Nserror * _nullable error) {  }];

The method is executed asynchronously

Two. JS Call OC

When the JS side wants to pass some data to the iOS. Then they call the method below to send.

window.webkit.messagehandlers.< Object Name >.postmessage (< data >)

The above code in the JS side write error, resulting in the page behind the business does not execute. Can be used to try-catch execute.

Then the processing method in OC is as follows. It is the proxy method for Wkscriptmessagehandler. Name corresponds to the object name in JS above.

-(void) Addscriptmessagehandler: (ID <WKScriptMessageHandler>) scriptmessagehandler Name: ( NSString *) name;

Specifically add the following

1. Set the agent and name of the Addscriptmessagehandler

Wkwebviewconfiguration *configuration =[[Wkwebviewconfiguration alloc] init]; Wkusercontentcontroller*usercontentcontroller =[[Wkusercontentcontroller alloc] init]; [Usercontentcontroller addscriptmessagehandler:self Name:@"Test"]; Configuration.usercontentcontroller=Usercontentcontroller; //Wkpreferences *preferences = [wkpreferencesNew]; Preferences.javascriptcanopenwindowsautomatically=YES;//preferences.minimumfontsize = 40.0;Configuration.preferences =preferences; _webview= [[Wkwebview alloc] Initwithframe:cgrectmake (0,0, WIDTH, HEIGHT64) configuration:configuration];

2.WKScriptMessageHandler protocol Method

-(void ) Usercontentcontroller: (Wkusercontentcontroller *) Usercontentcontroller didreceivescriptmessage: (wkscriptmessage * Span style= "COLOR: #008000" >// js call oc method  //  message.boby is the argument passed in JS  NSLog (@ " body:%@   "        ,message.body);  if  ([message.name isequaltostring:@ "  test   "  ] { //  concrete logic   [self sendMessage:message.body]; }    }

3. Destruction

-(void) dealloc {    ...    [[_webview configuration].usercontentcontroller Removescriptmessagehandlerforname: @" Object Name " ];    ...}

iOS js with native interaction two