Stale blur glass effect appears at top of UITableView and WKWebView after user updates device to iOS 27, app built with Xcode 26.3

Question

huaian_dy OP

Created 1w

Replies 5

Boosts 0

Participants 5

Environment

App built with Xcode 26.3 (iOS 26 SDK)
Deployment Target: iOS 16+
Issue occurs only on devices upgraded to iOS 27. Works perfectly on iOS 26.x.

Problem description: After end‑user upgrades their iPhone to iOS 27, a persistent stale frosted‑glass / blur rendering effect appears at the top area of screens. This symptom occurs both on native UITableView and inside WKWebView. No blur‑related code (UIVisualEffectView / backdrop‑filter) is added by our application. Layout frames, insets and contentOffset are all correct.

Reproduction hints: The issue can be triggered after presenting then dismissing a WKWebView which loads H5 with overlay popup. Rendering state seems to leak to the whole app process. The leftover blur remains until push/pop the view controller.

Is this an iOS 27 system bug, or do we need special adaptation for existing apps built with older Xcode 26.3 SDK? What is the proper workaround for apps compiled with Xcode26.3, since liquidGlassEffectEnabled is only available in iOS27 SDK and cannot be accessed in our current build environment.

Answer 1

Frameworks Engineer OP

Apple

1w

Hi,

App adoption should not be necessary to address this issue. If possible, would you be able to file a feedback report (https://feedbackassistant.apple.com) with more details about which app this is and the steps required to reproduce this issue?

Thank you!

Answer 2

murishi OP

1w

您好，我遇到和您同样的问题。而且我还发现，在「设置」里打开「降低透明度」会导致我所有页面的内容变成空白。目前也是没有找到根治的方法。目前我是这么临时解决的。

@implementation UIScrollView (iOS27)

+ (void)load {
    if (@available(iOS 27.0, *)) {
    static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            MISwizzInstance(self, @selector(willMoveToWindow:), @selector(mi_willMoveToWindow:));
        });
    }
}
- (void)mi_willMoveToWindow:(UIWindow *)newWindow {
    [self mi_willMoveToWindow:newWindow];
    if (@available(iOS 27.0, *)) {
        self.topEdgeEffect.hidden = YES;
    }
}
@end

Answer 3

DTS Engineer OP

Apple

5d

Hello @huaian_dy,

If you filed a feedback report, please share the feedback number in this thread so that we make sure we are discussing the same report, or if one was ever filed initially.

It seems @murishi might be offering a suggestion about a temporary workaround: To enable "Reduce Transparency" in Accessibility settings.

 Travis

Answer 4

DTS Engineer OP

Apple

5d

Hello @murishi,

I would like the engineering team investigating this issue to be aware of your case, and I want your workaround to be known.

Before I do so, I want to verify that you are seeing the same issue as the one originally reported.

To do so, file your own Bug Report using Feedback Assistant. Include your sample project and steps to demonstrates the issue. Reply with the FB number once completed.

Thank you,

 Travis

Answer 5

Zyreon OP

3d

Potentially related: After updating my device to iOS 27, I now see a blur glass effect at top of all PWAs I‘ve installed to my home screen. This blur effect had not been there when I was using iOS 26. Attached an example of GitLab installed as PWA:

It is displayed regardless of which PWA is being opened, so this issue should be unrelated to the application development itself.

Device information: iPhone 12 Mini, MGE33ZD/A, iOS 27.0