hello guys,
thanks for your comments - i just found the right knob to draw the
content of my "invisible" subview in my uiscrollview.
i simply subclassed every subview and implemented -drawRect:
additionally using uigraphicsgetcurrentcontext().
@david
yeah, this was just simple math to picture the scene - but you're
right, it depends...
and could you tell the iOS team i feel great with their APIs, please? thx ;)
here's the (ugly) method code, pdfRef and pageNo are properties of the
enclosing class/instance.
- (void) drawRect:(CGRect)rect {
// get the page reference
CGPDFPageRef page = CGPDFDocumentGetPage(pdfRef, pageNo);
CGContextRef context = UIGraphicsGetCurrentContext();
// white background
CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
CGContextFillRect(context, CGContextGetClipBoundingBox(context));
// transformation/-lation
CGContextTranslateCTM(context, 0.0, rect.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextConcatCTM(context, CGPDFPageGetDrawingTransform(page,
kCGPDFCropBox, rect, 0, true));
CGContextDrawPDFPage(context, page);
}
hope this help's someone else.
- bye
2010/6/24 David Duncan <[email protected]>:
> On Jun 24, 2010, at 8:59 AM, Martin Glaß wrote:
>
>> sorry, CATiledLayer actually improves performance. the downside is,
>> the tiles need time to be drawn and are faded in using an animation of
>> 0.25 seconds.
>> so, if there are 6 tiles to be drawn you end up seeing iOS building
>> the "mosaic" in a total of 1.5 seconds.
>
> The fade time is not synchronous with the content generation. If you generate
> content fast, it could all fade in in 0.25s. If it is taking longer, it is
> due to the rendering time of that content, but unless your rendering time is
> 0.25s it is unlikely that you will take exactly 1.5s for all of it to display
> :).
>
> --
> David Duncan
>
>
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