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Interaction between OC and JS and between OCJS

Source: Internet
Author: User
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Interaction between OC and JS and between OCJS

Currently, APP development is not limited to native development. Many are native + html5 hybrid development.

We can use the webView control to achieve hybrid development.

1. First you need to create an html page

<Html> 

Load this page during app Initialization


- (void)viewDidLoad {    [super viewDidLoad];        [self.webView loadRequest:[NSURLRequest requestWithURL:[[NSBundle mainBundle] URLForResource:@"index" withExtension:@"html"]]];}


2. Implement the UIWebViewDelegate Protocol


Using the stringByEvaluationgJavaScriptFromString protocol method,


Can complete OC call JS


#pragma mark - <UIWebViewDelegate>- (void)webViewDidFinishLoad:(UIWebView *)webView {    [webView stringByEvaluatingJavaScriptFromString:@"alert(100)"];}


3.


ShouldStartLoadWithRequest can be used to call OC in JS.


/*** Call OC using this method * third-party framework: WebViewJavaScriptBridge */-(BOOL) webView :( UIWebView *) webView shouldStartLoadWithRequest :( NSURLRequest *) request navigationType :( UIWebViewNavigationType) navigationType {// url = ddz: // sendMessage _? 200 NSString * url = request. URL. absoluteString; NSString * scheme = @ "ddz: //"; if ([url hasPrefix: @ "ddz: //"]) {NSLog (@ "method to call OC"); // obtain the path after the Protocol = sendMessage _? 200 NSString * path = [url substringFromIndex: scheme. length]; // use? Cutting NSArray * subpaths = [path componentsSeparatedByString :@"? "]; // Method name methodName = sendMessage: NSString * methodName = [[subpaths firstObject] stringByReplacingOccurrencesOfString: @" _ "withString: @": "]; // parameter params = 200 NSString * params = [subpaths lastObject]; [self defined mselector: NSSelectorFromString (methodName) withObject: params]; // NSLog (@ "% @", subpaths); return NO;} NSLog (@ "to load other requests, not to call the OC method"); return YES ;}


4.


On github also found a kind of interaction between oc and js class, you can look at the https://github.com/marcuswestin/WebViewJavascriptBridge

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