iOS Retina display: images double size
Solution 1
There's a much easier way to do this. Give the retina version of the image the same name as the non-retina version, except with a "@2x" at the end. For example, if your regular image was named foo.png
, then the retina version should be named [email protected]
.
Then, just refer to the regular version of the filename (e.g., foo.png
) at all times. When your app is running on non-retina hardware the regular image will be used, but whenever you're on retina hardware the higher-resolution image will be used automatically. It's easier than having to write an if statement for every image you use, plus it'll actually work.
Solution 2
You don't need to code the IS_RETINA test, just add the @2x suffix to the name of the file containing the image you want to use for the retina display, and iOS will automagically use that in preference.
Bundle 2 image files, prettyNavBarBackground.png and [email protected]
#define IMG_NAVIGATION_BAR_BACKGROUND prettyNavBarBackground
Then you can just use this single call, and iOS will select the appropriate option
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:IMG_NAVIGATION_BAR_BACKGROUND] forBarMetrics:UIBarMetricsDefault];
Bagbyte
Updated on June 05, 2022Comments
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Bagbyte almost 2 years
For testing not/retina display I've created an UIView with size 100x100.
I've create 2 images: - normal size (100x100) - retina size (200x200)
I have two situations: 1) Non-Retina display + Normal Size image in background 2) Retina display + Retina Size image in background
The 1st scenario is ok. In the 2nd scenario the image is double size and in my UIView I can see only 1/4 of the total image.
The same happens when I try to assign a background image to my UIViewController navigation bar as following:
if (IS_RETINA()) { [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:IMG_NAVIGATION_BAR_BACKGROUND_RETINA] forBarMetrics:UIBarMetricsDefault]; } else { [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:IMG_NAVIGATION_BAR_BACKGROUND] forBarMetrics:UIBarMetricsDefault]; }