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iOS Dev: iOS Application icons & sizes

iOS Application icons & sizes
Here the way : 

Below are some useful guidelines for naming & sizing of icon files required for iPhone-only apps, iPad-only apps, and Universal apps.

iPhone-only Apps

Include the following in your application's Resources group in the Xcode project:
Image Size (px)
File Name
Used For
Required Status
512x512
iTunesArtwork
Ad Hoc iTunes
Optional but recommended
57x57
Icon.png
App Store and Home screen on iPhone/iPod touch
Required
114x114
Icon@2x.png
Home screen for iPhone 4 High Resolution
Optional but recommended
72x72
Icon-72.png
Home screen for iPad compatibility
Optional but recommended
29x29
Icon-Small.png
Spotlight and Settings
Optional but recommended
50x50
Icon-Small-50.png
Spotlight for iPad compatibility
Recommended if you have a Settings bundle, otherwise optional but recommended
58x58
Icon-Small@2x.png
Spotlight and Settings for iPhone 4 High Resolution
Recommended if you have a Settings bundle, otherwise optional but recommended

Except for iTunesArtWork icon, list the names of each of these files in the  Icon files  entry in the  Info.plist. Follow the steps explained in "Adding Icon files in Info.plist" section below.


iPad-only Apps

Include the following in your application's Resources group in the Xcode project:

Image Size (px)
File Name
Used For
Required Status
512x512
iTunesArtwork
Ad Hoc iTunes
Optional but recommended
72x72
Icon-72.png
App Store and Home screen on iPad
Required
50x50
Icon-Small-50.png
Spotlight on iPad
Optional but recommended
29x29
Icon-Small.png
Settings on iPad
Recommended if you have a Settings bundle, otherwise optional but recommended

Except for iTunesArtWork icon, list the names of each of these files in the  Icon files  entry in the Info.plist. Follow the steps in "Adding Icon files in Info.plist" section below.

Universal Apps

Include the following in your application's Resources group in the Xcode project: 


Image Size (px)
File Name
Used For
Required Status
512x512
iTunesArtwork
Ad Hoc iTunes
Optional but recommended
57x57
Icon.png
App Store and the Home screen on iPhone/iPod touch
Required
114x114
Icon@2x.png
Home screen for iPhone 4 High Resolution
Optional but recommended
72x72
Icon-72.png
App Store and Home screen on iPad
Required
50x50
Icon-Small-50.png
Spotlight on iPad
Optional but recommended
29x29
Icon-Small.png
Settings on iPad and iPhone, and Spotlight on iPhone
Recommended if you have a Settings bundle, otherwise optional but recommended
58x58
Icon-Small@2x.png
Spotlight and Settings for iPhone 4 High Resolution
Recommended if you have a Settings bundle, otherwise optional but recommended


Except for iTunesArtWork icon, list the names of each of these files in the Icon files  entry in the  Info.plist. Follow the steps in "Adding Icon files in Info.plist" section below. 

Adding Icon files in Info.plist

To add the Icon files entry you will need to manually edit your  Info.plist file.
Open your Info.plist in Xcode, and add a new row of type "Array". Name the new field as "Icon Files".
Add entries of icon names (as per the list of icons needed for iPhone only, iPad only, universal apps) inside the "Icon Files" array as shown below.

Info.plist 


For more references : Apple HIG Custom Image Guide Lines

Happy Coding :) Cheers:)


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