标签栏-向所有控制器添加新光束

Question

Example

Has anyone got an example of doing something like that? I want it to be displayed all the time while passing between other controllers. I do not want to create it again in every controller.

Answer 1

Override TabBar controller's view did load, to create your beamView:

let beamViewHeight:CGFloat = 60

let beamView = UIView()
beamView.translatesAutoresizingMaskIntoConstraints = false
beamView.backgroundColor = .black
self.view.addSubview(beamView)

add constraint to align it bottom, top of the tab bar:

let bottom = NSLayoutConstraint(item: beamView, attribute: .bottom, relatedBy: .equal, toItem: self.tabBar, attribute: .top, multiplier: 1, constant: 0)
let leading = NSLayoutConstraint(item: beamView, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1, constant: 0)
let trailing = NSLayoutConstraint(item: beamView, attribute: .trailing, relatedBy: .equal, toItem: view, attribute: .trailing, multiplier: 1, constant: 0)
let height = NSLayoutConstraint(item: beamView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: beamViewHeight)

view.addConstraints([bottom, leading, trailing, height])

it look's like this: