what is the code to detect whether ios app running in iPhone, iPhone Retina display, or iPad?

Question

what is the code to detect whether ios app running in iPhone, iPhone Retina display, or iPad?

Background:

• for my iPhone application I have defined i

Answer 1

Here's 2 useful class methods that I use, which directly answers your question - which you may want to use further down the line:

+(BOOL)isPad
{
#ifdef UI_USER_INTERFACE_IDIOM
    return UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad;
#endif
    return NO;
}

+(BOOL)hasRetinaDisplay
{
    // checks for iPhone 4. will return a false positive on iPads, so use the above function in conjunction with this to determine if it's a 3GS or below, or an iPhone 4.
    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2)
        return YES;
    else
        return NO;
}