xcode 10（也可能是任意版本）run 模拟器时，发现会报下面的错误。
This app could not be installed at this time.Could not access item to be installed at /Users/userXXX/Library/Developer/CoreSimulator/Devices/BF5B6EA6-4CA0-46B3-B71B-B4B67306E000/data/Containers/Shared/SystemGroup/systemgroup.com.apple.installcoordinationd/Library/InstallCoordination/PromiseStaging/F1EE420E-4C00-4F01-B3A7-0C65CA45D055/HelloWorld.app
DTServiceHubClient failed to bless service hub for simulator iPhone Xs (F049C1E9-9E67-492E-89AB-AAB18F760EFA)
然后发现是因为我xcode 9没删，导致xcode 10 在应用程序里的名字叫“xcode的副本”，改成“xcode2”就不再报错了，猜测是中文字符有所影响。