PDF image drawing efficiency about uiimage-pdf

[mindbrix]

Hi Joe. Greetings from London!

PDF rendering will always be slower than loading a bitmap. If performance
is an issue I'd suggest caching the rendered UIImage objects in an
NSDictionary.

Also, I'd recommend doing all performance testing on an actual device, as
the simulator results can be very misleading.

Best,
Nigel.

On 23 February 2012 13:21, jacloven <
[email protected]

wrote:

Hi Nigel,

i tried UIImage+PDF and it worked well.But when i tried to compare with
png image on consumption of time, pdf is 6 or 7 times than png. pdf is
YingYang.pdf in your project, png has the same dimesions(480*479), iOS 5.0
simulator. I Modified your PDFView.m file like this:

NSLog(@"Start");
for (i=0; i<LoopTimes; i++)
{
CGContextDrawPDFPage( ctx, page1 ); //png is the same method like this
}
NSLog(@"End");

LoopTimes = 10, 100 or 1000, Do you have any advice on drawing efficiency?

Joe(From China, sorry for my poor english...)

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[mindbrix]

Hi Joe. UIImage+PDF now has a transparent cacheing layer to address this issue. Once cached, the performance should be comparable to using bitmaps from the application bundle.