ios知识整理:WKWebView,JavaScript向iOS传参

iOS代码.m

#import 
@interface XXXXXX ()
{
    WKWebView *_webview;    
    LikeRoDislikeView *_likeOrDislikeView;
}
@property (strong, nonatomic) WKUserContentController *userContent;
@end

@implementation XXXXXX
-(instancetype)init
{
    self = [super init];
    if (self) {
        WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
        self.userContent = [[WKUserContentController alloc] init];
        [self.userContent addScriptMessageHandler:self  name:@"ocMethod"];
        config.userContentController = self.userContent;
       
        _webview = [[WKWebView alloc] initWithFrame:self.view.frame configuration:config];;
        _webview.frame = self.view.frame;
        _webview.scrollView.delegate = self;
        [self.view addSubview:_webview];

    }
    return self;
}


- (void)这个方法是我从自己的后台获取html的代码:(NSString *)urlString{
     //给自己的从后台获取的html代码创建样式...可以不管这一部分...关注里面的部分就可以了.
     NSString *CSS= @"";
     NSString * htmlString = [NSString stringWithFormat:@"
%@
%@",CSS,urlString];
    
     //这个基础url是我本地缓存图片的位置.. 可以不管这个...
    // 获取当前应用的根目录
    NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];
    NSURL *baseURL = [NSURL fileURLWithPath:path];
    //body是服务器返回的html格式的文章代码
    [_webview loadHTMLString:htmlString baseURL:baseURL];
}

-(void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    NSString *messageName = message.name;
    if ([@"ocMethod" isEqualToString:messageName])
    {
        id messageBody = message.body;
        NSLog(@"%@",messageBody);
    }
}
@end

html代码