What is the alternative for adjustsFontForContentSizeCategory iOS?

This Property work in only iOS 10+ OS what is alternative solution for replace property .

Apple documentation for Objective C

  @property(nonatomic) BOOL adjustsFontForContentSizeCategory;

Apple documentation for Swift

var adjustsFontForContentSizeCategory: Bool { get set }

This property is not working in lower version when we open in lower version app is crash.