UIImage+PDF provides a
UIImage class category method to render a
UIImage from any PDF stored in the application bundle. The motivation for this was to enable the easy use of scaleable vector assets in
Add the sources files in the
UIImage+PDF sub folder to your project. Use the following line to import the necessary methods.
Then simply call one of the
UIImage class methods as shown here:
UIImage *img = [ UIImage imageWithPDFNamed:@"YingYang.pdf" atSize:CGSizeMake( 40, 40 ) ]; UIImage *img = [ UIImage imageWithPDFNamed:@"YingYang.pdf" atWidth:60 ]; UIImage *img = [ UIImage imageWithPDFNamed:@"YingYang.pdf" atHeight:90 ]; UIImage *img = [ UIImage originalSizeImageWithPDFNamed:@"YingYang.pdf" ];
atHeight: methods are particularly useful as they preserve the aspect ratio of the source PDF.
An example project is included in this repository. The important code is in
UIImage+PDF now transparently caches all rendered PDFs in
<Application_Home>/Library/Caches/__PDF_CACHE__. This substantially improves application latency with large PDFs, especially on the new iPad. To disable cacheing, comment out
#define UIIMAGE_PDF_CACHEING 1 in
PDF file size
By default Adobe Illustrator saves exported PDFs very inefficiently. For best results, export in EPS format, load this into Preview and then save as a PDF. The included example file
YingYang.pdf shrunk to 10% of its original size with this workflow.
Other vector graphics editors which natively use the OSX Quartz renderer, such as Sketch, will create much more compact PDFs.
This licence is derived from one used by Matt Gallagher
Copyright 2012 Nigel Timothy Barber - @mindbrix. All rights reserved.
Permission is given to use this source code file without charge in any project, commercial or otherwise, entirely at your risk, with the condition that any redistribution (in part or whole) of source code must retain this copyright and permission notice. Attribution in compiled projects is appreciated but not required.