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Proper way of implementing writePreviewsForDocument:error Thread Tools Search this Thread Display Modes
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Hi again -

In my custom OUIDocument subclass I override writePreviews with the following implementation:

1) create my images. both landscape and portrait
2) cache them like this:
Code:
[OUIDocumentPreview cachePreviewImages:^(OUIDocumentPreviewCacheImage cacheImage){
        cacheImage(landscapeImage, [OUIDocumentPreview fileURLForPreviewOfFileURL:fileURL date:date withLandscape:YES]);
        cacheImage(portraitImage, [OUIDocumentPreview fileURLForPreviewOfFileURL:fileURL date:date withLandscape:NO]);
    }];
3) actually write out the previous to disk like this:
Code:
    NSData *imageData = UIImageJPEGRepresentation([UIImage imageWithCGImage:landscapeImage], 1.0);
    [imageData writeToURL:[OUIDocumentPreview fileURLForPreviewOfFileURL:fileURL date:date withLandscape:YES] options:0 error:outError];
    
    imageData = UIImageJPEGRepresentation([UIImage imageWithCGImage:portraitImage], 1.0);
    [imageData writeToURL:[OUIDocumentPreview fileURLForPreviewOfFileURL:fileURL date:date withLandscape:NO] options:0 error:outError];
Seems to work but is this the proper way of implementing this method?

Thanks in advance
 
 


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