Question

I need to know current device is iPad2 or new iPad.
I use [[UIScreen mainScreen] Scale],but the result is 1.0

Answer 1

As found here:

if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad && [[UIScreen mainScreen]     respondsToSelector:@selector(scale)] && [UIScreen mainScreen].scale > 1)
{
    // new iPad
}