How to increase font size of date picker?

Normally you cannot.

But it seems you can tweek the system a bit:

h ttps://stackoverflow.com/questions/37678487/how-to-change-font-size-of-date-picker-view-and-picker-view-in-ios-objective-c

To change the attributes of a segmented picker, you can add this init to your View struct:

   init() {
    //This changes the "thumb" that selects between items
    UISegmentedControl.appearance().selectedSegmentTintColor = .red
     
    //This changes the color for the whole "bar" background
    UISegmentedControl.appearance().backgroundColor = .purple

     
    //This will change the font size
    UISegmentedControl.appearance().setTitleTextAttributes([.font : UIFont.preferredFont(forTextStyle: .headline)], for: .highlighted)
    UISegmentedControl.appearance().setTitleTextAttributes([.font : UIFont.preferredFont(forTextStyle: .largeTitle)], for: .normal)
     
    //these lines change the text color for various states
    UISegmentedControl.appearance().setTitleTextAttributes([.foregroundColor : UIColor.cyan], for: .highlighted)
    UISegmentedControl.appearance().setTitleTextAttributes([.foregroundColor : UIColor.green], for: .selected)
  }