Xcode cannot run using the selected device. 解决办法

1.重启（当然这种方法一般情况下不管用）

2. 查看证书是否是正确的

3.PROJECT --> Info --> Deployment Target --> IOS Deployment Target 里面的值 要设置为 <=真机系统版本

TARGETS --> Summary --> IOS Application Target --> Deployment Target 里面的值 要设置为 <=真机系统版本

也要查看一下这两个是否正确

PROJECT --> Build Settings --> Deployment --> IOS Deployment Target

TARGETS --> Build Settings --> Deployment --> IOS Deployment Target