[[[UIWebView alloc] init] stringByEvaluatingJavaScriptFromString:@"alert(100);"];//oc直接运行js代码
- html代码
<html>
<!-- 网页的描述信息 -->
<head>
<meta charset="UTF-8">
<title>第一个网页</title>
<script>
function login()
{
// 让webView跳转到百度页面（加载百度页面）
location.href = 'JavaScript://sendMessage_number2_number3_?100&100&99';
}
</script>
</head>
<!-- 网页的具体内容 -->
<body>
<button style="background: red; width:100px; height:30px;" onclick="login();">Call</button>
</body>
</html>
-
OC代码
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { // url == JavaScript://sendMessage_?200 NSString *url = request.URL.absoluteString; NSString *scheme = @"JavaScript://"; if ([url hasPrefix:scheme]) { // 获得协议后面的路径 path == sendMessage_number2_?200&300 NSString *path = [url substringFromIndex:scheme.length]; // 利用?切割路径 NSArray *subpaths = [path componentsSeparatedByString:@"?"]; // 方法名 methodName == sendMessage:number2: NSString *methodName = [[subpaths firstObject] stringByReplacingOccurrencesOfString:@"_" withString:@":"]; // 参数 200&300 NSArray *params = nil; if (subpaths.count == 2) { params = [[subpaths lastObject] componentsSeparatedByString:@"&"]; } // 调用 [self performSelector:NSSelectorFromString(methodName) withObjects:params]; return NO; } NSLog(@"想加载其他请求，不是想调用OC的方法"); return YES; } - (id)performSelector:(SEL)selector withObjects:(NSArray *)objects { // 方法签名(方法的描述) NSMethodSignature *signature = [[self class] instanceMethodSignatureForSelector:selector]; if (signature == nil) { [NSException raise:@"错误" format:@"%@方法找不到", NSStringFromSelector(selector)]; } // NSInvocation : 利用一个NSInvocation对象包装一次方法调用（方法调用者、方法名、方法参数、方法返回值） NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature]; invocation.target = self; invocation.selector = selector; // 设置参数 NSInteger paramsCount = signature.numberOfArguments - 2; // 除self、_cmd以外的参数个数 paramsCount = MIN(paramsCount, objects.count); for (NSInteger i = 0; i < paramsCount; i++) { id object = objects[i]; if ([object isKindOfClass:[NSNull class]]) continue; [invocation setArgument:&object atIndex:i + 2]; } // 调用方法 [invocation invoke]; // 获取返回值 id returnValue = nil; if (signature.methodReturnLength) { // 有返回值类型，才去获得返回值 [invocation getReturnValue:&returnValue]; } return returnValue; } - (void)sendMessage:(NSString *)number number2:(NSString *)number2 number3:(NSString *)number3 { NSLog(@"%s %@ %@ %@", __func__, number, number2, number3); }
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