Use JavaScript to invoke native APIs in iOS WebView

1. First include the relevant code in JavaScript

$ ('. Content. Savecode '). On (' Touchstart ',function() {//Touchstart        if(temp = = 0) {jump (); }        if(Temp = = 1) {android.savepic (IMAGE.SRC);}    }); functionJump () {//IOS        varTouchstart =true; Window.location= "/touchstart";//Change URL Note: To use the "/" delimiter    }    functionPoststr () {//IOS        returnimage.src; }

2. iOS save picture to local code

//when you have finished loading the page, take it to ImageUrl
- (void) Webviewdidfinishload: (UIWebView *) webview{_urlstring= [_mywebview stringbyevaluatingjavascriptfromstring:@"poststr ();"]; NSLog (@"%@", _urlstring);} Call Order-Shouldstart->finishload-> Callback block function
-(BOOL) WebView: (UIWebView *) WebView shouldstartloadwithrequest: (Nsurlrequest *Request Navigationtype: (uiwebviewnavigationtype) navigationtype{if([Request.mainDocumentURL.relativePath isequaltostring:@"/touchstart"]) {Uiimagefromurl ([Nsurl urlwithstring:_urlstring],^ (UIImage *image) {Uiimagewritetosavedphotosalbum (image, Self, @selector (Onsavecomplete:didfinishsavingwitherro                       R:contextinfo:), nil); }, ^(void) {NSLog (@"error!");        }); return false; }    return  true;}voidUiimagefromurl (Nsurl * URL,void(^imageblock) (UIImage * image),void(^errorblock) (void) {Dispatch_async (Dispatch_get_global_queue (Dispatch_queue_priority_default,0), ^(void) {NSData* data =[[NSData alloc] initwithcontentsofurl:url]; UIImage* Image =[[UIImage alloc] initwithdata:data]; Dispatch_async (Dispatch_get_main_queue (),^(void){                           if(Image! =Nil)                           {Imageblock (image); } Else{errorblock ();                   }                       }); });}

Use JavaScript to invoke native APIs in iOS WebView