ScrollView contentOffset bug

[vivalaakam]

Hi! in RN 0.48.1 doesn`t work contentOffset when component is initialized.
Here is example for reproduction https://github.com/vivalaakam/rn_issue

In this example after initialize i will be see second screen, named 'Welcome to screen #2'

In version 0.47.2 it work as well

1. react-native -v

react-native-cli: 2.0.1
react-native: 0.48.1

2. node -v

v8.4.0

3. npm -v

5.4.0

4. yarn --version

0.27.5

[stage88]

This is probably related to 1d22f8f, the scenario the commit addresses doesn't apply to me so i have replaced line 319 in node_modules/react-native/React/Views/RCTScrollView.m with

// self.contentOffset = CGPointMake(
//   MAX(0, MIN(originalOffset.x, fullContentSize.width - boundsSize.width)),
//   MAX(0, MIN(originalOffset.y, fullContentSize.height - boundsSize.height)));
self.contentOffset= originalOffset;

That fixes my negative offset with refresh control problem, it will have to do until the issue is fixed.

[shergin]

Well, the problem with this issue is that contentOffset prop should not exist in the first place. (And it does not exist on Android.)
Could we use scrollTo method instead?

[janicduplessis]

@shergin I think we should try landing #15670 to fix that regression

[krizpoon]

I have similar problem and solved it with:

self.contentOffset = CGPointMake(
    MAX(-contentInset.left, MIN(originalOffset.x, fullContentSize.width - boundsSize.width)),
    MAX(-contentInset.top, MIN(originalOffset.y, fullContentSize.height - boundsSize.height)));

[pull-bot]

@facebook-github-bot no-template

[facebook-github-bot]

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[henrikra]

@shergin Could you explain more why contentOffset prop should not exists? For example now on Android I have to do weird hacks to init scroll view's position to something that I want.