How to detect Retina HD display?

Question

UIScreen has a new, nativeScale property in iOS 8 but the documentation does not say a word about it.

@property(nonatomic, readonly) CGFloat nativeScale

There is also a scale property but the docs say it is 2 for retina displays.

@property(nonatomic, readonly) CGFloat scale

I am wondering if there is a way to distinguish the displays. The reason why I need to know whether the device has Retina HD display is because I want to request images with different sizes based on the displays.

Thanks for any help!

Answer 1

Check the below code:

 CGRect screenBounds = [[UIScreen mainScreen] bounds];
CGFloat screenScale = [[UIScreen mainScreen] scale];
CGSize screenSize = CGSizeMake(screenBounds.size.width * screenScale, screenBounds.size.height * screenScale);

NSLog(@"WIDTH:%f",screenSize.height);
 NSLog(@"WIDTH:%f",screenSize.width);



float height =screenSize.height;
float width = screenSize.width;

NSString *deviceType=@"";

if (height==1136.000000 && width==640.000000)
{
    deviceType =@"iPhone 5,5S and 5C Retina";
}
if (height==1920.000000 && width==1080.000000)
{
    deviceType =@"iPhone 6 Plus Retina Downsample";
}

if (height==2208.000000 && width==1242.000000)
{
    deviceType =@"iPhone 6 Plus Retina";
}

if (height==1334.000000 && width==750.000000)
{
    deviceType =@"iPhone 6 Retina";
}
if (height==960.000000 && width==640.000000)
{
    deviceType =@"iPhone 4 and 4S Retina";
}
if (height==480.000000 && width==320.000000)
{
    deviceType =@"iPhone 3g and 3gs Non retina ";
}

NSLog(@"Your Result:%@",deviceType);

Reference:

iPhone Resoution

Answer 2

Below works very well to detect type of display on iPhone6Plus.

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 3.0)
    NSLog(@"Retina HD"); 
else
    NSLog(@"Non Retina HD");