IOS FAQ (What's the ghost series)-copy Storyborad inexplicably collapsed, iosstoryborad

IOS FAQ (What's the ghost series)-copy Storyborad inexplicably collapsed, iosstoryborad

 

 

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Replication is everywhere. It is inevitable that the Storyboard interface will be copied. Today, it is an inexplicable crash! I checked that neither the Code nor Storyborad had a red cross. I vaguely remembered that I had changed the field name. Then I checked each part carefully and found the problem:

Cause of crash: the associated constraints are deleted in the code, but the Storyboard is not cleaned up, causing a crash. The trouble is that the debugging information does not show any problems at all. Just delete it.