linker command failed with exit code 1 (use -v to see invocation) Undefined symbols for architecture
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解決的方法為
先點選專案 (左邊navigator列表 點選專案的圖示)
選擇target
選擇頁籤 Build Phases
Compile Sources如果沒展開的話先展開
按加號
將這個target需要的.m檔案都加入吧
(如果只有一個target 就是把所有.m檔案都加入)
這樣應該就可以解決了
會出現這樣的問題
應該是在把.m .h檔案加入到專案裡的時候
Add to targets沒有勾選要加入的target
所以記得加入的時候要勾
解决方法点击工程，在主界面中点击Build Phases，根据提示信息“XXX”来判断缺少什么文件，一般如果缺少自定义的文件，XXX会是缺少的类名，那么就在Complie Sources中加入该文件。如果缺少类库，则在Link Binary With Libraries中加入该类库。
http://suwoeiiuan.blogspot.tw/2012/04/xcode-ide-class-bug.html
在网上查了一下解决方案，发现事实上这个问题是由我的Duplicate symbol error 引起的，而Duplicated symbol error的原因是在我删除了pbxproj文件然后重新添加file时造成了文件的多次加入，也就是说一个Proj中某个类写了两次implementation，所以报错。
参考链接：
http://stackoverflow.com/questions/2264455/iphone-duplicate-symbol-error
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