Screen flickering when open panel/popup in Cordova app

Questions
1

Using 2.0.10, Anyone have the same problem in iOS11? There is no such problem in Safari

2

Looks like it only occurs when the main view is scrollable

3

Anyone can help or have the same problem?

Screen flickering right before the popup open when the view content is scrollable:

Screen flickering right before the panel open when the view content is scrollable:

4

@nolimits4web can you please help, tried to found the solution but no luck, the flashing occur in below scenarios:

  1. Only in iOS PhoneGap environment, no problem in mobile safari
  2. Main view content is scrollable
  3. Occur when open panel or popup

Many thanks

5

Finally found out where is the problem, seems it can be solved by removing the following CSS, it seems no other side effect and I will create a pull request, cheers!

It was inspired by this post that it’s an iOS bug.

html.with-panel .framework7-root > .views .page-content,
html.with-panel .framework7-root > .view .page-content {
  overflow: hidden;
  -webkit-overflow-scrolling: auto;
}

html.with-modal-popup .framework7-root > .views .page-content,
html.with-modal-popup .framework7-root > .view .page-content,
html.with-modal-popup .framework7-root > .panel .page-content {
      overflow: hidden;
      -webkit-overflow-scrolling: auto;
}
6

Weird, i remember this bug was in previous iOSes, and I can’t experience the same on my iOS 11 devices. Do you use UIWebView or WKWebView?

Actually this styles are required to prevent page scrolling behind the panel and its overlay

7

I am testing in a iPhone 7 Plus with iOS 11.2.5, using PhoneGap Developer app or built with PhoneGap Build got the same problem. (Should be UIWebView right?)

I remember the page scrolling problem when panel is opened (in V1). After removed the above CSS, the flickering problem is gone and without the page scrolling problem. I believe the backdrop already prevented the scrolling problem in V2.

8

Backdrop doesn’t prevent this problem if you scroll over panel itself. It still will scroll page behind it

9

Interesting, need further study on that but certainly the flickering problem is annoying.

10

Just tried to use an iPhone X with iOS 11.2 in PhoneGap developer app also got the flickering

11

Try the WKWebView plugin

12

Thanks! Will take a look on wkwebview, anything I need to pay attention to?

13

It may not work if you have local XHR requests )

14

But is the router using local xhr?

Just tried using wkwebview in PhoneGap build, it only show a white screen after splash screen, any hint?

15

By local I mean XHR to local files, so if you have in your routes “url” pointing to local files then it won’t work due to Cors policy. You can try then ionic-wkwebview plug-in for Cordova, it has fixed this issue

1 Like
16

Thanks for introducing the cordova-plugin-ionic-webview plugin and it works like a charm.

The official cordova-plugin-wkwebview-engine doesn’t work because it don’t allow local xhr, i.e. F7 router load page with path file://xxxxx/www/page.html is prohibited and the ionic plugin solved it.

Also the flickering problem is gone, and the response and user experience is much better than using UIWebView, thanks again.

1 Like
17

Hey @robinyip , Can you please tell me the name of the ionic plugin, which is used to resolve the file:// problem, thanks a lot!

18

That is cordova-plugin-ionic-webview

19

I searched on every forum on internet and eventually end up fixing this by flickering screen on an iPhone can be caused by various factors, such as software glitches, hardware issues, or problems with certain apps. Here are some steps you can take to try and fix iPhone screen flickering:-
1. Restart Your iPhone:-
-A simple restart can often resolve software-related issues. Turn off your iPhone and then turn it back on.
2. Adjust Display Settings:-
-Go to Settings > Display & Brightness and try adjusting the brightness and other display settings. Sometimes, flickering can be related to display settings.
3. Check for App Issues:-
-If the flickering occurs when using a specific app, try updating the app to the latest version. If the issue persists, consider uninstalling and reinstalling the problematic app.
4. Disable Auto-Brightness:-
-Sometimes, the auto-brightness feature can cause screen flickering. Go to Settings > Accessibility > Display & Text Size, and disable Auto-Brightness.
5. Reset All Settings:-
-Resetting all settings on your iPhone can help if the issue is related to system settings. Go to Settings > General > Reset > Reset All Settings. Note that this won’t delete your data, but you’ll need to reconfigure your preferences.
6. Perform a Hard Reset:-
-A hard reset can help in some cases. Depending on your iPhone model, the process varies. For iPhone 8 and later, quickly press and release the volume up button, then press and release the volume down button, and finally, press and hold the side button until you see the Apple logo.
7. DFU Restore:-
-If none of the above steps work, you can try performing a DFU (Device Firmware Update) restore using iTunes or Finder on your computer. This is a more extensive restore that reinstalls both the software and firmware on your device. Be sure to back up your data before attempting this.

If the problem persists after trying these steps, Follow for more assistance.

https://www.youtube.com/watch?v=FwiVOCRpils&ab_channel=TheGeekPage