UIDevice+Resolutions.m

//
//  UIDevice+Resolutions.m
//  i48
//
//  Created by Daniel Parnell on 15/02/13.
//
//  See: http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size
//

#import "UIDevice+Resolutions.h"

@implementation UIDevice (Resolutions)

- (UIDeviceResolution)resolution
{
    UIDeviceResolution resolution = UIDeviceResolution_Unknown;
    UIScreen *mainScreen = [UIScreen mainScreen];
    CGFloat scale = ([mainScreen respondsToSelector:@selector(scale)] ? mainScreen.scale : 1.0f);
    CGFloat pixelHeight = (CGRectGetHeight(mainScreen.bounds) * scale);
    
    if ([self userInterfaceIdiom] == UIUserInterfaceIdiomPhone){
        if (scale >= 2.0f) {
            if (pixelHeight == 960.0f)
                resolution = UIDeviceResolution_iPhoneRetina4;
            else if (pixelHeight >= 1136.0f)
                resolution = UIDeviceResolution_iPhoneRetina5;
            
        } else if (scale == 1.0f && pixelHeight == 480.0f)
            resolution = UIDeviceResolution_iPhoneStandard;
        
    } else {
        if (scale >= 2.0f && pixelHeight >= 2048.0f) {
            resolution = UIDeviceResolution_iPadRetina;
            
        } else if (scale == 1.0f && pixelHeight == 1024.0f) {
            resolution = UIDeviceResolution_iPadStandard;
        }
    }
    
    return resolution;
}

@end