How can NSIntegers be written to a file?

Question

Objective-C

There is an array Y, it contains objects X's with a field @property(nonatomic, assign) NSInteger *num;
, you need to selectively save these nums to a file so that you can load them into another array when loading the program!
How to do it?

Answer 1

1. through NSNumber drive into NSArray and save it to plist file
2. ... - convert to JSON and save to file

Answer 2

Try using NSCoding - here's a great tutorial.

Answer 3

I hope NSInteger *numthis is a typo

Answer 4

Convert to numbers of the required type (int, double) and save.