【xcconfig】
1.When you can use a .xcconfig file?
Use .xcconfig files if you find yourself changing the same build
settings for each project you create. Place the build settings
you‘re changing in the .xcconfig file. By using a .xcconfig file you can
avoid editing those build settings every time you create a project.
Having the option to use different
.xcconfig files for each build configuration allows you to place the debug build
settings you‘re constantly changing in one .xcconfig file and place the release
build settings you‘re changing in another xcconfig file. Use multiple .xcconfig
files if the build settings you‘re changing have different values for debug and
release builds or if you change some build settings only for debug builds and
other build settings only for release builds.
2.How to create a .xcconfig file?
New File----->iOS Other------>Configuration Settings
File
3.How to add the .xcconfig file to the project and do some
settings?
Go to your project‘s info screen, under the configurations section
expand the list until you find the target you want your scheme to apply to, then
select it from the drop down box.
4. How to write the .xcconfig file?
Look for a build setting you want to add to your .xcconfig file in
the build settings list, set it to the value you want it to be, then
select that row, hit Command+C to
copy, then push delete to get rid of your setting. And then, go
into your .xcconfig file and paste the contents of your clipboard. You will
notice that you copied the key and value.
参考：
1、http://blog.163.com/chenchen..1986/blog/static/7606314620125541841397
2、http://blog.csdn.net/tjsjping/article/details/6959548
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xcconfig
原文：http://www.cnblogs.com/tekkaman/p/3677898.html
