App Icons on iPad and iPhone

转自：https://developer.apple.com/library/ios/#qa/qa2010/qa1686.html

Q:  How are the icon files in my application bundle used on iPad and iPhone?

A: Below are guidelines for handling icon files for iPhone-only apps,iPad-only apps,and universal apps.

Important Icons marked with "required" must be supplied in your application bundle.

Note: iTunesArtwork icon file should be in png format,but name it without the .png extension.

iPhone-only Apps

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

Table 1  iPhone-only apps icon requirements.

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	[e-mail]	Home screen for iPhone 4 High Resolution	72x72	Icon-72.png	Home screen for iPad compatibility	29x29	Icon-Small.png	Spotlight and Settings	50x50	Icon-Small-50.png	Spotlight for iPad compatibility	Recommended if you have a Settings bundle,otherwise optional but recommended
58x58	[e-mail]	Spotlight and Settings for iPhone 4 High Resolution	ottom:0.667em; padding-left:0.667em; font-size:13px; vertical-align:middle; border-bottom-width:1px; border-bottom-style:solid; border-bottom-color:rgb(155,otherwise optional but recommended

Your Resources group should look similar to figure 1:

figure 1  Add files to Resources group

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 "Add Icon files in Info.plist" section below. See figure 4.

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iPad-only Apps

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

Table 2  iPad-only apps icon requirements. App Store and Home screen on iPad

Spotlight on iPad

Settings on iPad

Except for iTunesArtWork icon,102)">Info.plist. Follow the steps in "Add Icon files in Info.plist" section below. See Figure 5.

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Universal Apps

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

Table 3  Universal apps icon requirements. App Store and the Home screen on iPhone/iPod touch

Settings on iPad and iPhone,and Spotlight on iPhone

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Add Icon files in Info.plist

To add the Icon files entry you will need to manually edit your Info.plist.

Open your Info.plist in Xcode,and locate the "Icon file" entry. Click on the plus (+) button at the end of the entry to make a new key entry. as shown in Figure 2.

figure 2  Add a new entry under "Icon file" key

Then,type "Icon files" in the key column (notice the "s" added),or choose "Icon files" from the drop down list,as shown in figure 3.

figure 3  Add "Icon files" key in Info.plist

Next,turn down the disclosure triangle on "Icon files" and add the entries for the icons for your application,as shown in figure 4 and figure 5:

figure 4  Add icon file entries for iPhone-only or Universal apps.

figure 5  Add entries for iPad icon files.

Note: If you don't provide one of the listed optional icons,the system will automatically scale one of your existing icons to an appropriate size. However,it is strongly recommended that your application supply all the icons listed with specific sizes needed.

For additional information,see the Build-Time Configuration Details section in the iOS Application Programming Guide.

For details on using the CFBundleIconFiles key,see Information Property List Key Reference. For information on creating your applications icons,see the Application Icons section of the iOS Human Interface Guidelines.

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Document Revision History

Date	Notes
2011-07-14	After iOS 4.3,order doesn't matter in the icon arrangement. Added links to related references.
2010-07-14	Fixed outdated "Add Icon files in Info.plist" section.
2010-07-12	Updated for iOS 4 requirements.
2010-04-09	New document that explains how the icon files in an application bundle are used on iPad and iPhone.