控制台总是输出:xcode error: failed to attach to process ID 0

Xcode compiles my App, but can't run it in the simulator?

一种情况是你多个target中使用的相同的Bundle identifier和Bundle display name，所以改成不同的，要把模拟器里的app清空下

The solution for me was to delete everything Xcode has generated earlier:

• the App on the Simulator...if this is not possible because you cant reach the Homescreen, you can delete the App directly under ~/Library/Application Support/iPhoneSimulator/6.0/Applications
• delete the Derived Data in the Organizer under Projects or directly in~/Library/Developer/Xcode/DerivedData
• clean the Build Folder by choosing "Product" in the MenuBar and click while you press the Alt-key on "Clean Build Folder"

版权声明：本文为博主原创文章，未经博主允许不得转载。