ios - 标签栏 - 向所有 Controller 添加新光束

Question

Example

有人有这样做的例子吗？我希望它在其他 Controller 之间传递时始终显示。我不想在每个 Controller 中再次创建它。

Answer 1

覆盖TabBar Controller 的 View 已加载，以创建您的beamView:

let beamViewHeight:CGFloat = 60

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

添加约束以使其与标签栏底部、顶部对齐:

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])

它看起来像这样: