dyld: could not load inserted li

更新Xcode 6和 iOS 8的正式版之后，调试我们app的时候出错了，Log里提示：

Running an iOS 8 app = `dyld: could not load inserted library '/Developer/usr/lib/libBacktraceRecording.dylib' because image not found`.

弄了好一会才搞定，解决办法有3个步骤：

1）Clean 后重新 Build

2）退出Xcode后删掉目录 ~/Library/Developer/Xcode/DerivedData

3）重启 iPhone