Do I need to suffix @3x in UIImage imageNamed?

Question

There are iPhone 6 and iPhone 6 plus device available from apple.

• I have three pics including @2x and @3x. When I load image using UIImage imageNamed:.
• Do I need to add @3x ad the end of file? My naming convention is pic.png, pic@2x.png, pic@3x.png.
• Do I need to do like first check the running device is iPhone 6 and then [UIImage imageNamed:@"pic@3x.png"] or just [UIImage imageNamed:@"pic"] and the device will automatically use the right image for the right device?

Answer 1

Sol: [UIImage imageNamed:@"pic"] is enough instead of [UIImage imageNamed:@"pic.png"].

Reason:

• Device automatically detect pic@2x.png & pic@3x.png once you added into you project.
• If you not added any pic@2x.png or pic@3x.png image means device will load pic.png automatically.
• So you just add this line [UIImage imageNamed:@"pic"] in your project.

Answer 2

TLDR: be sure to include @2x images if you are supporting iOS 6/7, or specify "*@3x" in imageNamed.

If you support older version of iOS (6/7), you need to do 1 of 2 things.

First option: include all versions of an image (normal, 2x, 3x). Preferred.

Second Option: if you only include a @3x image, [UIImage imageNamed"pic"] will work great on iOS 8 (downscaling the 3x image to 2x or 1x size as needed), however, it fails on iOS 7 since iOS 7 wasn't ever aware of @3x. You should use [UIImage imageNamed"pic@3x"]

Answer 3

[UIImage imageNamed:@"pic"]

is enough.

Suffixes (@2x for iPhone 4 to 6 and @3x for iPhone 6 plus) are added automatically if image with this suffix is found.