Detecting iPhone 6/6+ screen sizes in point values

Question

Given the newly announced iPhone 6 screen sizes:

iPhone 6: 1334h * 750w @2x (in points: 667h * 375w)
iPhone 6+: 1920 * 1080 @3x (in points: 640h * 360w)
         


        

Answer 1

I had to detect the iPhone 6 Plus in an app built with iOS 7. Because nativeScale isn't available on [UIScreen mainScreen] I tried to use [UIScreen mainScreen] scale] but this just returned 2.0. So I came up with this solution to detect the iPhone 6 Plus on iOS 7 (should also work on iOS 8):

-(BOOL)iPhone6Plus{
BOOL isiPhone6Plus = NO;
SEL selector = NSSelectorFromString(@"scale");
if ([[UIScreen mainScreen] respondsToSelector:selector]) {
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:
                                [[[UIScreen mainScreen] class] instanceMethodSignatureForSelector:selector]];
    [invocation setSelector:selector];
    [invocation setTarget:[UIScreen mainScreen]];
    [invocation invoke];
    float returnValue;
    [invocation getReturnValue:&returnValue];
    if (returnValue == 3.0) {
        isiPhone6Plus = YES;
    }
    NSLog(@"ScaleFactor %1.2f", returnValue);
}
return isiPhone6Plus;

}

The interesting part of this code is, that if I use NSInvocation the return value of the scale selector will be 3.0. Calling this method directly on iOS 7 returns 2.0.