iphone - iOS 4.0 contentScaleFactor and scale - how to handle in 3.1.3? -

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i tasked making app works in ios 4.0 work in 3.1.3 , 3.2 again. straightforward handling of new api scale , other situations values must passed/returned hard.

respondstoselector/performselector takes care of else.

here's simplified version of going on:

-(float)getimagescalefactor  {   if([[uiscreen mainscreen] scale == 2.0)       return kscalefactorforretinadisplay;   else       return kscalefactorforolderdisplay; }

scale isn't in ios prior 4.0.

can show code sample work in versions of ios?

i use similar code, you're missing 1 important part: respondstoselector:

if([[uiscreen mainscreen] respondstoselector:@selector(scale)] && [uiscreen mainscreen].scale == 2.0f)     return kscalefactorforretinadisplay; else     return kscalefactorforolderdisplay;

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