CODEWITHSUNDEEP
objective-c
Toran Billups
Toran Billups

Reputation: 27399

How to set an image based on iphone platform in objective-c

I'm moving my application from 3.x to 4.x as I prepare for the app store and found that I need to have 2 copies of all my custom pngs - my question is how can I determine what img to show and when. Example - how do I know to show the Find.png vs the [email protected]

Is it "safe" or "correct" to look for 4.x specific apis or does the iphone have a way to determine what platform you are on at runtime?

Thank you in advance

Upvotes: 0

Views: 177

Answers (4)

fbrereto
fbrereto

Reputation: 35925

If your application is running on (I believe) iOS 4.2 or greater and the images are PNG files you can replace you calls of:

[UIImage imageNamed:@"Find.png"];

with simply:

[UIImage imageNamed:@"Find"];

On the later versions of the OS imageNamed attempts to treat the incoming parameter as a root name to an image instead of the specific image name itself. In such a case it has the intelligence built-in to load the graphic most appropriate for the device.

Upvotes: 1

Alex Deem
Alex Deem

Reputation: 4805

If you use the imageNamed: method of UIImage the @2x business is handled for you.

Otherwise you can check the scale of the screen as in this question

Upvotes: 1

Erick Smith
Erick Smith

Reputation: 930

[[UIDevice currentDevice] model];
[[UIDevice currentDevice] systemName];
[[UIDevice currentDevice] systemVersion];

Detect retina screen/iPhone 4 in iPhone SDK

Upvotes: 1

Ben Cochran
Ben Cochran

Reputation: 1290

When you use standard APIs, the phone handles grabbing the @2x version when necessary. For example if you use [UIImage imageNamed:@"Find.png"]; and run on an iPhone 4, it would load [email protected] automatically.

Upvotes: 3

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