摘要：
1.Command-Option-Shift-K to clean out the build folder XCode4.2 finder中找到 /Users/apple/Library/Developer/Xcode （注：Library资源库是隐藏的文件夹） 里面有DerivedData和Snapshots两个文件夹，删除里面文件即可 Removeallits contents because there's a bug where Xcode will run an old version of your project that's in there somewher 阅读全文