学步园

iPhone-only Apps

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

Table 1 : iPhone-only apps icon requirements.

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, in the order shown in the table. 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.

Except for iTunesArtWork icon, list the names of each of these files in the
Icon files entry in the Info.plist, in the order shown in the table. 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.

Except for iTunesArtWork icon, list the names of each of these files in the
Icon files entry in the Info.plist, in the order shown in the table. Follow the steps in "Add Icon files in Info.plist" section below. See
Figure 4.

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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.

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http://www.cocoachina.com/bbs/read.php?tid-24549.html

以前貌似发现相关尺寸，这次来点详细的，相信不少人用的到。。。。

从icon说起
命名方法，举例
Icon.png                         57×57
Icon-72.png                   72×72
Icon-Small.png             29×29
Icon-Small-50.png       50×50
Icon@2x.png                114×114
Icon-Small@2x.png     58×58

另
iTunesArtwork               512×512

在info.plist使用key CFBundleIconFiles，注意与CFBundleIconFile区分开，CFBundleIconFiles的优先级高于CFBundleIconFile
省略扩展名，直接写Icon，会自动识别
如果要加扩展名，必须把所有的图片名都添加到CFBundleIconFiles的array中
特别需要注意的是，如果想自动识别，命名必须严格按照标准，且key为string类型。如果不自动识别，key为array类似并将完整文件名添加进去

Default命名方法

<basename><orientation_modifier><scale_modifier><device_modifier>.png

这个就不多说了，方法和icon是一样的，只列出相关的后缀

<basename>默认为Default，也可用UILaunchImageFile key设置，在这用Default举例
<orientation_modifier> 旋转方向

-PortraitUpsideDown
-LandscapeLeft
-LandscapeRight
-Portrait
-Landscape
None

也就是说你可以Default-Portrait.png 来表示竖屏时的加载图像，同样也可以直接Default.png不指定方向

<scale_modifier>依然是为iphone4准备，用法和icon雷同
Default-Portrait.png与Default-Portrait@2x.png会自动识别

<device_modifier>区分设备，有2个值
~iphone
~ipad
Default-Portrait~iphone.png与Default-Portrait~ipad.png会自动判断设备  同样需要注意的一点，这个在icon里面同样适应，但是貌似现在没有使用的必要，看来未来ipad的分辨率也会扩充一倍？

如果使用了Custom URL Schemes，不多说了，格式如下，用法同上
<basename>-<url_scheme><scale_modifier><device_modifier>.png
如：
Default-myscheme.png与Default-myscheme@2x.png

图片：
如果你的资源目录下有Button.png与Button@2x.png两张图片
那么使用：
UIImage* anImage = [UIImage imageNamed:@"Button"];
将会自动识别图片加载

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Add a CFBundleIconFiles key of type Array to your Info.plist. The array should contain 2 string items: the filenames of the two icons. The OS will then automatically choose
the correct icon for each platform based on their pixel dimensions.

You can keep the CFBundleIconFile key and have it point to the icon file for the iPhone for 3.0/3.1 compatibility.