CODEWITHSUNDEEP
iphoneiosuiimageviewuiimage
user1256477
user1256477

Reputation: 11201

is retina working in my developer iphone?

I'm testing my app in an iPhone5.

I duplicate an image, named image1.png and [email protected], and tried it in iPhone5, in some part of my code:

UIImage *myImage = [UIImage imageNamed:@"image1.png"] ;

CGFloat imageWidth = myImage.size.width;
CGFloat imageHeight = myImage.size.height;

  NSLog(@"image %f %f", imageWidth,imageHeight);

CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;


NSLog(@"screen %f %f", screenWidth, screenHeight);

and when running in the iphone, in the console I see:

2013-04-05 13:13:48.386 Vallabici[2413:907] image 320.000000 57.000000
2013-04-05 13:13:48.389 Vallabici[2413:907] screen 320.000000 568.000000

as it was using normal screen instead of retina.

how can it be?

Upvotes: 0

Views: 61

Answers (3)

meronix
meronix

Reputation: 6176

screens are always measured in pixel

and retina pixels are always = non retina pixel

by code you'll get always screen pixel of 230x480 (on iPhones < 5)

the difference is how images are rendered: on retina display they are rendered at double resolution

It's like printer devices: you can print a small image to an A4 paper filling it, and then print a bigger image...

images printed to paper have always the same measures (in inches or centimeters), but the quality of the results change

Upvotes: 1

James Webster
James Webster

Reputation: 32066

bounds returns the size of the screen in points, not pixels

See the documentation.

The same is true of size

Upvotes: 2

rckoenes
rckoenes

Reputation: 69499

The size of the image should not change on the retina device, just the scale. To take the scale of the image add the following log:

 NSLog(@"scale %f", myImage.scale);

Upvotes: 2

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