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Update image docs with missing iOS style warning 

Summary:
As discussed in #10570 to document that corner specific border radius styles are unsupported with the iOS image component.

Closes #10570

Have signed the CLA and ensured the website section affected still works
Screenshot included as suggested in the contribution guidelines.

![rn-doc-update](https://cloud.githubusercontent.com/assets/1386054/19838492/4eb91d7c-9ec8-11e6-98cf-c085ef4af5c2.png)
Closes https://github.com/facebook/react-native/pull/10632

Differential Revision: D4102593

fbshipit-source-id: ffc901ec4e7e50f5a189fb2d98d79eaa33a95e37
This commit is contained in:
Dan Purdy 2016-10-30 11:26:23 -07:00 committed by Facebook Github Bot
parent 426e66cfe6
commit 954df6d13e
1 changed files with 9 additions and 0 deletions
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docs/Images.md
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@ -136,6 +136,15 @@ return (
);
```
## iOS Border Radius Styles
Please note that the following corner specific, border radius style properties are currently ignored by iOS's image component:
* `borderTopLeftRadius`
* `borderTopRightRadius`
* `borderBottomLeftRadius`
* `borderBottomRightRadius`
## Off-thread Decoding
Image decoding can take more than a frame-worth of time. This is one of the major sources of frame drops on the web because decoding is done in the main thread. In React Native, image decoding is done in a different thread. In practice, you already need to handle the case when the image is not downloaded yet, so displaying the placeholder for a few more frames while it is decoding does not require any code change.