I couldn't update Xcode 8.3.3 on the Appstore, and it didn't work even after updating the system. It kept asking me to enter the password for my appid, which eventually caused the computer to freeze, which was simply unbearable.
Later, I successfully downloaded the installation package directly from the Developer Center. Here are the download steps:
Enter the Apple Developer Center page, drag to the bottom of the page and click Downloads;
Enter the download page. Do not click the Xcode download button on the page. You will enter the iTunes page and you will not be able to find the download location in the end. After entering this page, drag to the bottom and click on the location in the picture below:
You can go to all the tool pages:
Just click on the blue xcode word to download it directly. I don’t need to explain the subsequent installation.
Attached here is the link to the page . The above briefly explains how to enter this page. It took me a long time to find it. . .
Finally, after the XCode update on the AppStore failed, the XCode turned gray and showed that it was waiting and could not be clicked. This was the most irritating moment. Enter Launchpad, find XCode, press the Command button, click XCode and wait for the cross to appear in the upper left corner. Do not release the Command button and click the cross to return to the original version.
Reprinted from: http://www.jianshu.com/p/43b72e9e5e7d