IPad xcode cannot connect to iPad.

Today is March 14, the legendary White Valentine's Day. In the morning, I took an iPad and connected it to my computer. I didn't expect xcode to recognize it. At the beginning, I thought that iPad also needed to make certificates like iphone, so I started to create certificates with great expectation. After the certificate is created, the certificate is also applied to the mobile phone and xcode. As a result, xcode still cannot recognize the iPad. Then I wondered if there was a problem with my new project, and the iPhone certificate came up without thinking about it. After I connect the iPhone to xcode, xcode will display the iPhone device. Then I deleted the certificate from the iPhone and found that xcode still can connect to the iPhone. Here we can draw a conclusion thatWhether xcode can connect to an iOS device has nothing to do with the certificate.

After a series of explorations, the problem can finally be solved.

The solution is;

select use for development in organizer, and the green light is displayed, can be connected