Provide segment control like iOS13 photo app
[FloatingSwitch]https://github.com/usagimaru/FloatingSwitch
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github "catelina777/FloatingSegmentedControl"
- Install a custom view on Interface Builder.
 - Important: Assign the custom view class as 
FloatingSegmentedControllike this. - Set an appropriate layouts. In the default implementation of FloatingSegment, the width follows the intrinsic size.
 - Set segments with 
setSegments (with:)method. - Set 
targetandactionwith addTarget method. Then you can catch control events when users switch segments. 
See ViewController.swift for usage.

