(please refer to Radar #34263778)
Hello Apple,
We have noticed a problem in our production app, related to zooming of text in a UIWebView, in iOS11b9.
We have simple HTML content in a UIWebView, with a "line-height" value in "px":
"<html><head><style type=\"text/css\">body {line-height:20px;}</style></head><body>test test test<br>test test test</body></html>"
and we affect the zoom with this:
"[self.webview stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.getElementsByTagName(\"body\")[0].style.webkitTextSizeAdjust = \"%d%%\"", size]];"
On iOS10.3 it works correctly (the line height is resized automatically with "webkitTextSizeAdjust") (see screenshot test1_ios10.png), but on iOS11b9 the line height is not resized (see screenshot test1_ios11b.png with text overlap)
As a workaround, using "line-height: 130%" seems to work correctly, but we're not ready to make this change in our production app, without knowing the reason for the change.
Notes:
-the problem appears in iOS11b9 (latest developer beta), but also since iOS11b6, using Xcode 8.3.3. But works correctly in iOS10.3
-we also tested similar code on our macOS application and it seems to be working correctly on macOS 10.12.6 and macOS10.13b9
A few Questions:
-Is this a bug or a new feature in iOS11?
-Is there documentation for these changes?
-Are there any workarounds we could use in our production app that would work on iOS10 and iOS11?
