webkitTextSizeAdjust is not working on iPad device with iOS 13.1 and Above

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Created Oct ’20

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NSString *jsString = [[NSString alloc] initWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '150%'"];

[self.wkWebView evaluateJavaScript:jsString completionHandler:^(id Nullable result, NSError * Nullable error) { }];

I have executed above line of codes, Its was not working on iPad with iOS 13 above version. But The same line of codes are working good on iPhone device with any iOS versions.

Can I Know that, why it's not working on iPad devices with iOS 13.1 and above.

Source Code

Please clarify this issue as soon as possible and suggest us any other alternative way to achieve this requirement.

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Answer 1

Frameworks Engineer OP

Apple

Oct ’20

From another WebKit dev in <rdar://problem/68764330>:

"On iOS 13, WKWebView on iPad treats websites as 'desktop' websites by default, which means that -webkit-text-size-adjust CSS property has no effect. In iOS 14 and above, you can regain manual control of -webkit-text-size-adjust by setting your WKWebpagePreferences’ preferredContentMode to WKContentModeMobile. I do not believe there is a solution for iOS 13.

"(besides finding some other way to change the text size, like the CSS zoom property [on iOS 13])"

2