用Xcode创建英语程序的时候，系统会自动给你的icon四角添加圆角效果，并且在icon的上部添加光晕效果，有些时候会使得icon看不太清楚。圆角效果是系统默认的，无法改变。57*57的icon，四角圆角的半径是9、10这样子
但是光晕效果是可选的，可以通过设置来去除，方法如下：
用文本编辑工具打开info.plist, 在键值区域添加如下字段：
<key>UIPrerenderedIcon</key> <true/>
保存即可。
或者在target info里面添加Icon already includes gloss effects并且设置为Yes
转帖内容如下：http://iphonedevelopertips.com/general/remove-shine-gloss-effect-on-iphone-icon.html
Remove Shine / Gloss Effect on iPhone Icon
By default, when building an application with Xcode, your icon will have a round beveling of the corners and a shine added over the top of the icon. The icon below shows how this looks:
You can override this default by following line to you to the Info.plist file. For example, if you prefer to edit Info.plist as a source file, add the following line:
<key>UIPrerenderedIcon</key> <true/>
If you are editing Info.plist as an XML file (in Xcode) you can add an entry that looks as follows:
Depending on your configuration and version of Xcode, the option in the Info.plist file may looks as follows:
With the pre-rendered icon set to true, the icon shown above will now look like this:
This preference setting only applies to removing of the shine / glossy effect, the corners of your icon will still be rounded for you.