Customize the user agent in WebView (iOS)

原文链接

Use the key UserAgent in NSUserDefaults to customize your user agent. Please perform the customization once only during the app launch and before any instantiation of UIWebView or WKWebView.

The following is an example adding the string MY_CUSTOM_USER_AGENT to the beginning of the original user agent.

// get original UserAgent string by using temporal UIWebView
UIWebView *tmp = [[UIWebView alloc] init];
NSString *originalUA = [tmp stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];

// create custom UserAgent string
NSString *customUA = [NSString stringWithFormat:@"%@ %@", @"MY_CUSTOM_USER_AGENT", originalUA];

// set custom UserAgent as default
NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:customUA , @"UserAgent", nil];
[[NSUserDefaults standardUserDefaults] registerDefaults:dictionary];

同样适用于WKWebView（参考链接）
Both of the above work for both UIWebView and WKWebView on iOS