概述:javascript
使用UIWebView加載頁面,使用UIWebView的方法stringByEvaluatingJavaScriptFromString調用javascript的方法。css
在javascript中使用document.body.appendChild(iFrame)這樣的方式喚起UIWebViewDelegate的方法html
shouldStartLoadWithRequest。經過調用stringByEvaluatingJavaScriptFromString得到javascript中的數據變化。java
一、oc調用javascriptios
建立UIWebView對象,並設置UIWebViewDelegate。web
調用stringByEvaluatingJavaScriptFromString方法,執行javascript中的方法。canvas
例如:app
webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 400, 600)];dom
webView.delegate = self;測試
[self.view addSubview:webView];
[self->webView stringByEvaluatingJavaScriptFromString:@"self.testAction()"];
二、javascript調用oc
oc代碼:
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL* url = [request URL];
if ([[url scheme] isEqualToString:kCustomProtocolScheme]) {
NSString* test = [self->webView stringByEvaluatingJavaScriptFromString:@"self.testAction()"];
if ([test isEqualToString:@"1"]) {
//此處添加自定義方法
return NO;
}
else
{
return YES;
}
}
return YES;
}
javascript代碼:
<!doctype html><html> <head> <meta charset="UTF-8"> <title>good</title> </head> <style type="text/css"> canvas{border:dashed 1px #CCC} </style> <script type="text/javascript"> var test = '0'; function call() {alert("測試開始") } function testAction() { return test; } function js_call_oc() { var canvas = $$('can'); var context = canvas.getContext("2d"); context.clearRect(0,0,400,300); var iFrame; iFrame = document.createElement("iframe"); iFrame.setAttribute("src", "ios://jwzhangjie"); iFrame.setAttribute("style", "display:none;"); iFrame.setAttribute("height", "0px"); iFrame.setAttribute("width", "0px"); iFrame.setAttribute("frameborder", "0"); document.body.appendChild(iFrame); // 發起請求後這個iFrame就沒用了,因此把它從dom上移除掉 iFrame.parentNode.removeChild(iFrame); iFrame = null; test = "1"; } </script> <body onload="call();"> <canvas id="can" width="400px" height="300px">40000000000</canvas> <input type="button" id="btn1" value="調用oc代碼!" onclick="js_call_oc()" /> </body></html>