ios - NavigationTitle 与 subTitle 重叠

Question

我有一个带有 rightButtonItem 的导航栏和另一个带有 right&leftButtonItem 的导航栏。
我练习尝试使用带有子标题的导航栏，但是当我将标题和子标题字符串设置得很长时。
它会重叠，并且字符串被截断。
我该如何解决这个问题？

Issue picture_1
Issue picture_2

func setTitle(title:String, subtitle:String) -> UIView {
    let titleLabel = UILabel(frame: CGRect(x:0, y:-5, width:0, height:0))

    titleLabel.backgroundColor = UIColor.clear
    titleLabel.textColor = UIColor.red
    titleLabel.font = UIFont.boldSystemFont(ofSize: 14)
    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.blue
    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 {
        var frame = titleLabel.frame
        frame.origin.x = widthDiff / 2
        titleLabel.frame = frame.integral
    } else {
        var frame = subtitleLabel.frame
        frame.origin.x = abs(widthDiff) / 2
        titleLabel.frame = frame.integral
    }

    return titleView

}//source from here:https://gist.github.com/nazywamsiepawel/0166e8a71d74e96c7898

Answer 1

这部分代码需要进行一点修改:

if widthDiff > 0 {
    var frame = titleLabel.frame
    frame.origin.x = widthDiff / 2
    titleLabel.frame = frame.integral
} else {
    var frame = subtitleLabel.frame
    frame.origin.x = abs(widthDiff) / 2

    // this should be *subtitleLabel*
    //titleLabel.frame = frame.integral
    subtitleLabel.frame = frame.integral

}