flutter_webview_plugin iOS端加载本地h

修改iOS FlutterWebviewPlugin.m 源代码

- (void)navigate:(FlutterMethodCall*)call {
    if (self.webview != nil) {
            NSString *url = call.arguments[@"url"];
            NSNumber *withLocalUrl = call.arguments[@"withLocalUrl"];
            if ( [withLocalUrl boolValue]) {
                NSURL *htmlUrl = [NSURL fileURLWithPath:url isDirectory:false];
                NSString *localUrlScope = call.arguments[@"localUrlScope"];
                
                //为减少对三方插件的修改,加载本地html,文件名暂时只支持命名为名index
                NSURL *findUrl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/Frameworks/App.framework/flutter_assets/%@", [[NSBundle mainBundle] bundlePath], url]];
                NSLog(@"Debug >>>> %@", findUrl);
                NSString *loadUrl = [findUrl.absoluteString stringByReplacingOccurrencesOfString:@"index.html" withString:url];
                htmlUrl = [NSURL URLWithString:loadUrl];
                NSLog(@"Debug >>>> load url %@", htmlUrl);
                
                if (@available(iOS 9.0, *)) {
                    if(localUrlScope.class == NSNull.class || localUrlScope == nil) {
                        [self.webview loadFileURL:htmlUrl allowingReadAccessToURL:htmlUrl];
                    }
                    else {
                        NSURL *scopeUrl = [NSURL fileURLWithPath:localUrlScope];
                        [self.webview loadFileURL:htmlUrl allowingReadAccessToURL:scopeUrl];
                    }
                } else {
                    @throw @"not available on version earlier than ios 9.0";
                }
            } else {
                NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
                NSDictionary *headers = call.arguments[@"headers"];

                if (headers != nil) {
                    [request setAllHTTPHeaderFields:headers];
                }

                [self.webview loadRequest:request];
            }
        }
}

参考地址 ：https://blog.csdn.net/u014665060/article/details/105315854