// MARK:自定義 TitleView
func setTitle(title:String, subtitle:String) -> UIView {
let titleLabel = UILabel(frame: CGRect(x: 0, y: -2, width: 0, height: 0))
titleLabel.backgroundColor = UIColor.clear
titleLabel.textColor = UIColor.gray
titleLabel.font = UIFont.boldSystemFont(ofSize: 17)
titleLabel.text = title
titleLabel.sizeToFit()
let subtitleLabel = UILabel(frame: CGRect(x: 0, y: 18, width: 0, height: 0))
subtitleLabel.backgroundColor = UIColor.clear
subtitleLabel.textColor = UIColor.black
subtitleLabel.font = UIFont.systemFont(ofSize: 12)
subtitleLabel.text = subtitle
subtitleLabel.sizeToFit()
let titleView = UIView(frame: CGRect(x: 0, y: 0, width: max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), height: 30))
titleView.addSubview(titleLabel)
titleView.addSubview(subtitleLabel)
let widthDiff = subtitleLabel.frame.size.width - titleLabel.frame.size.width
if widthDiff < 0 {
let newX = widthDiff / 2
subtitleLabel.frame.origin.x = abs(newX)
} else {
let newX = widthDiff / 2
titleLabel.frame.origin.x = newX
}
return titleView
}
調(diào)用方法脱羡，在 viewDidLoad() 中調(diào)用
self.navigationItem.titleView = setTitle(title: "書架", subtitle: "已選擇1本")
效果圖：
custom titleView
