UIToolbars:通过代码和设计师的不同高度

Question

找不到我在创建工具栏时出错的地方.

1 - 通过代码创建,请参阅下文

let toolBar = UIToolbar()
var items = [UIBarButtonItem]()
toolBar.barTintColor = theme.barTintColor
let share = UIBarButtonItem(barButtonSystemItem: .action, target: nil, action: nil)         
items.append(share)
items.append(UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil))
let trash = UIBarButtonItem(barButtonSystemItem: .trash, target: nil, action: nil)
self.view.addSubview(toolBar)

toolBar.translatesAutoresizingMaskIntoConstraints = false


if #available(iOS 11.0, *) {           
   let guide = self.view.safeAreaLayoutGuide
   toolBar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
   toolBar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
   toolBar.bottomAnchor.constraint(equalTo: guide.bottomAnchor).isActive = true
  //toolBar.heightAnchor.constraint(equalToConstant: 44).isActive = true
}

2 - 通过设计师添加

看起来它们具有不同的高度,因此在UIBarButtonItems之上有不同的缩进

编辑0:在故事板中,toolbar 2默认配置

编辑1:可视化调试器显示_UIToolbarContentView从toolbar 2高处_UIToolbarContentView toolbar 1开始5px.

<_UIToolbarContentView: 0x153e13190; frame = (0 0; 375 49); autoresize = W+H; layer = <CALayer: 0x1d0236d80>>
Printing description of $28:
<_UIToolbarContentView: 0x15b9f08d0; frame = (0 0; 375 44); autoresize = W+H; layer = <CALayer: 0x1d522af00>>

编辑2:iPhone X上的这种奇怪的行为,在iPhone 6上都很好.

解决方法:如果是iPhone X,请添加此hack toolBar.heightAnchor.constraint(equalToConstant: 49)