xcode提示This app could not be installed at this time

1.点击模拟器:
选择:
Hardware -> Erase All content and settings；清空模拟器的缓存
2.点击项目:
把项目清一下
shift+cmd+K
shift+opt+cmd+K
3.重新运行就OK

参考:http://www.u3dchina.com/T8423P2P1.html