Method1(亲测有效):
target -> Build Settings -> 搜索weak -> 切换WeakReferences in Manual Retain Release的值为No (No->Yes->No)
Method2:
进入Preferences…-> Text Editing

Method3:
退出Xcode,重启电脑,前往文件夹~/Library/Caches/com.apple.dt.Xcode并删除,并删除DerivedData,重新运行Xcode
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