iOS 修改UIWebView的UserAgent

    // 修改WebView的UserAgent
    UIWebView *webView = [UIWebView new];
    NSString *userAgent = [webView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];
    NSString *appUserAgent = [NSString stringWithFormat:@"%@/%@ (%@; iOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], [[UIScreen mainScreen] scale]];
    userAgent = [userAgent stringByAppendingString:@" "];
    userAgent = [userAgent stringByAppendingString:appUserAgent];
    [[NSUserDefaults standardUserDefaults] registerDefaults:@{@"UserAgent" : userAgent, @"User-Agent" : userAgent}];