AKWebRenderer is an experimental iOS library which allows you to render web pages into snapshot views. This repository hosts an example project TwitterClient to demonstrate how it works.
Requires iOS SDK 7.0 or above to build. Requires iOS 7.0 or above to run.
AKMediaCache.h AKMediaCache.m AKWebRenderWorker.h AKWebRenderWorker.m AKWebRenderRequest.h AKWebRenderRequest.m
There are several topics about workaround implementations. You can find many questionable codes in this library because of them, so I'm going to write down details and reasons as far as possible.
http://stackoverflow.com/questions/10996028/uiwebview-when-did-a-page-really-finish-loading http://stackoverflow.com/questions/5809212/how-do-i-tell-when-a-uiwebview-is-done-rendering-not-loading
- (UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates can create snapshot views much faster compared to - (UIView *)resizableSnapshotViewFromRect:(CGRect)rect..., but the view returned from - (UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates is dynamic, which means its contains are updated when the source UIWebView contents are changed.
Another problem here is there is no way to render UIWebView into CGContext in other than main thread. Doing so causes lock error and there are no workarounds for this problem as far as I can find. That's why I prefered to use snapshot views instead of images.
http://ero.movie.coocan.jp/iPhone/AboutCameraApp.pdf
Views returned from - (UIView *)resizableSnapshotViewFromRect:(CGRect)rect... are private subclass of _UIReplicantView, and they have a child view which inherits from a private class _UIReplicantContentView. layer property of _UIReplicantContentView object has a subview of CASlotProxy as its backing store (layer.contents property). As a result, we can't simply call [layer renderInContext:] to create a CGImageRef instance from layer. That's why I had to workaround this by creating a copy of view which shares CASlotProxy backing store with the original snapshot view.
- Multiple AKWebRenderWorker for better performance
- Caches rendered snapshots to disk
- Support for iOS 6 (Possibly negative because of how this library is implemented)
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The MIT License (MIT)
Copyright (c) 2013 Masashi Ono.
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