Open "Product -> Scheme -> Edit Scheme..." in Xcode and add to "Arguments Passed on Launch":
-com.apple.CoreData.SQLDebug3
-com.apple.CoreData.SQLDebug3-com.apple.CoreData.Logging.stderr1
(The second launch argument is needed for Core Data debugging on iOS 10/macOS 10.12 or later, seecom.apple.CoreData.SQLDebug not workingfor more information.)
The you'll see all the values that the SQL statements are bound to. Example output:
test56[1588:c07]CoreData:sql:BEGINEXCLUSIVE
test56[1588:c07]CoreData:sql:INSERTINTOZEVENT(Z_PK,Z_ENT,Z_OPT,ZTIMESTAMP)VALUES(?,?,?,?)test56[1588:c07]CoreData:details:SQLite bind[0]=(int64)13test56[1588:c07]CoreData:details:SQLite bind[1]=(int64)1test56[1588:c07]CoreData:details:SQLite bind[2]=(int64)1test56[1588:c07]CoreData:details:SQLite bind[3]="368650709.435904"test56[1588:c07]CoreData:sql:COMMIT
