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I get this code from Googling but XCode display error: “Property ‘backingScaleFactor’ not found on object type ‘NSScreen *'”
CGFloat displayScale = 1.0f;
if ([[NSScreen mainScreen] respondsToSelector:@selector(backingScaleFactor)])
{
displayScale = [NSScreen mainScreen].backingScaleFactor;
}
Use
[[NSScreen mainScreen] backingScaleFactor]and make sure that you are building for the OS X 10.7 SDK, with the deployment target set to 10.6.