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pre-render image to improve loading performance #30

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pre-render image to improve loading performance #30

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11 changes: 9 additions & 2 deletions ios/RCTImageSequence/RCTImageSequenceView.m
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Original file line number Diff line number Diff line change
Expand Up @@ -30,9 +30,16 @@ - (void)setImages:(NSArray *)images {
#endif

dispatch_async(dispatch_queue_create("dk.mads-lee.ImageSequence.Downloader", NULL), ^{
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]];
UIImage *frameImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]];
// here is the code to pre-render the image
UIGraphicsBeginImageContext(frameImage.size);
CGRect rect = CGRectMake(0, 0, frameImage.size.width, frameImage.size.height);
[frameImage drawInRect:rect];
UIImage *renderedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf onImageLoadTaskAtIndex:index image:image];
[weakSelf onImageLoadTaskAtIndex:index image:renderedImage];
});
});

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