iOS Zooming issue

[matiasbontempo]

When zooming, the view resets to the center. This means that if I move around the pdf and then try to zoom in or out, I get back to the center every time.

[wonday]

It look like zooming from the current screen center,
but after zooming, if you move to a new place,
the next zooming will be from new screen center.
In simulator it looks like this,
I have no device on hand now, I do not known what is the pinch in result.

[matiasbontempo]

I tested this on a physical device and it's the exact same behaviour.

[nonotest]

yep - having the same problem with the latest version. not sure how to help with debugging?

[matiasbontempo]

The zooming issue is fixed in the latest version. However, now whenever you pan the view goes to the top right of the file in iOS. Should I create a new issue for this?

Thanks!

[mrharel]

We are also having some issues with iOS zooming: after zoom, the view goes to the left of the document and doesn't allow to move to the right, only up and down, and the text is very blurry. on Android, after a zoom the text is re-renderer in high quality.

[donovantc]

I have the same issue when creating a standard react native app with the basic setup for this viewer as defined in the readme.

On iOS, when you zoom in and scroll to the right, it snaps back to the left and you can't scroll right anymore, even though the page is still scaled > 1.

This makes it almost completely unusable on iOS if you want to enable scaling. Any ideas how to resolve this?

[wonday]

Please wait, I am rewriting IOS codes again, and almost finished.
It will resolve most problems.

[wonday]

@ALL I rewrite the iOS codes, and commit to master.
welcome to test.

Notice:
I tested by RN 0.47.1.
RN 0.50.0+ will cause "Changing viewabilityConfig on the fly is not supported" error.
waiting RN to fix this bug.

[eballeste]

changing viewabilityConfig error can be bypassed by declaring the object as a constant outside of the render method

[wonday]

@eballeste
it works, thanks.

[wonday]

two many old version problems, close it.
If still have problem, please create a new one.

[jjercx]

Hi, I have problems with iOS pinch zoom in latest version. It's not smooth at all, and the center of the PDF moves to the bottom right corner of the screen. On android looks very good. If you need, I can record my screen.

[wonday]

Because I use TileLayer for drawing performance, when zoom, it will redraw screen with tile first, when all drawing finished, it will show at pinch center.
It is not a perfect solution.