iOS WKWebView 添加 UserAgent

- (void)requestWithUserAgent {
    
    [self.wkWebView evaluateJavaScript:@"navigator.userAgent" completionHandler:^(id _Nullable response, NSError *error) {
        
        NSString *res = response;
        // 防止重复添加
        if ([res containsString:@"xxxxxx"]) {
            NSArray *agentArray = [res componentsSeparatedByString:@"xxxxxx"];
            self.userAgent = agentArray.firstObject;
        } else {
            self.userAgent = response;
        }
        
        NSString *agent = [NSString stringWithFormat:@"%@%@", self.userAgent, [self.common convertUserAgentToJson]];
        
        NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:agent, @"UserAgent", nil];
        [[NSUserDefaults standardUserDefaults] registerDefaults:dictionary];
        [[NSUserDefaults standardUserDefaults] synchronize];
        [self.wkWebView setCustomUserAgent:agent];
        
        [self loadWKWebView];
    }];
}

- (void)loadWKWebView {
    
    NSString *urlString = [NSString stringWithFormat:@"%@/%@", [self.common host], URL_HTML];
    NSURL *url = [NSURL URLWithString:urlString];
    
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    NSString *agent = [NSString stringWithFormat:@"%@%@", self.userAgent, [self.common convertUserAgentToJson]];
    [request addValue:agent forHTTPHeaderField:@"UserAgent"];
    
    [self.wkWebView loadRequest:request];
}