How to detect device name in Safari on iOS 13 while it doesn't show the correct user agent?

Question

After Apple's iOS 13 reales, I realized window.navigator.userAgent in Safari on iPad iOS 13 is same as on MacOS. Something like this:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.15

As you see, it's a wrong user-agent for iPad and even there is no way to detect if the current device is an iDevice.

---

After an initial research, I found a work around for it:

Go to Settings -> Safari -> Request Desktop Website -> All websites. You notice "All websites" is enabled by default. If you disable it and get window.navigator.userAgent the correct user agent is now displayed.

but I cannot ask each user to do this setting change for each device. So I tried to find another way and ended up by writing the following code which checks if it's Safari, macOS, and touch-screen then the device should be an apple mobile device, but I'm wondering is there any better suggestion/way to detect the correct device name in Safari iOS 13?

detectOs = function(){
   //returns OS name, like "mac"
};

//is Safari on an apple touch-screen device
isSafariInIdevice = function(){
   if (/Safari[\/\s](\d+\.\d+)/.test(windows.navigator.userAgent)) {
      return 'ontouchstart' in window && detectOs() === "mac";      
   }
   return false;
};

Answer 1

Indeed, while option change in Settings may be a good solution for the user, as a developer you can't rely on that. It is as weird as to ask the user to not to use dark mode cause your app doesn't support it instead of opt-out of it using plist.

As for me, the most simple way to detect iOS / iPad OS device now:

let isIOS = /iPad|iPhone|iPod/.test(navigator.platform) ||
(navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)

The first condition is old-fashioned and works with previous versions, while the second condition works for iPad OS 13 which now identifies itself as "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) AppleWebKit/605.1.15 (KHTML, like Gecko)", which by all platform detectors I know is not detected (for now) neither as mobile nor desktop.

So since iPad OS now calls itself Macintosh, but real macs have no multi-touch support, this solution is ideal to detect iPad OS devices which are the only multi-touch "Macintosh" devices in existence.

P.S. Also, you may want to augment this checkup for IE exclusion from being detected as an iOS device

let isIOS = (/iPad|iPhone|iPod/.test(navigator.platform) ||
(navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)) &&
!window.MSStream

Answer 2

UIWebView *webView = [[UIWebView alloc] init];
NSString *command =[NSString stringWithFormat:@"navigator.userAgent"];
NSString *customUserAgent = [webView stringByEvaluatingJavaScriptFromString:command];
[(WKWebView *)_webView setCustomUserAgent:customUserAgent];