IOS coredata avoid adding duplicate data, ioscoredata

IOS coredata avoid adding duplicate data, ioscoredata

First, you need to know that the item in your data is unique, and then process the unique query and insert order. During the query, the first time the array is null, the array content is 0. insert the data for the first time, and then insert the data if the unique parameter exists or not. This will avoid repeated data. This is a logic problem that we didn't figure out before, and then we suddenly figured it out today.

If you have any questions, please trust me to show you the demo.