iOS 11 - Navigationbar 大标题自定义偏移量

iOS 11 - Navigationbar large title custom offset

是否可以更改大导航栏标题的x-offset?我想将 x-offset 更改为 36pt。

你不能。您需要编写自己的 NavigationController,为此将 UINavigationController 子类化。

您可以通过这种方式添加额外的偏移量:

if #available(iOS 11.0, *) {
    let navigationBarAppearance = UINavigationBar.appearance()
    let style = NSMutableParagraphStyle()
    style.alignment = .justified
    style.firstLineHeadIndent = 18
    navigationBarAppearance.largeTitleTextAttributes = [NSAttributedStringKey.paragraphStyle: style]
}

您必须子类化 UINavigationBar,然后覆盖 draw 方法,并在内部进行更改。看看我的工作示例,然后根据需要调整 offset/styles:

    override func draw(_ rect: CGRect) {
    super.draw(rect)

    self.backgroundColor = UIColor.white
    let largeView = "_UINavigationBarLargeTitleView"
    let labelcolor = UIColor(red: 36.0/255.0, green: 38.0/255.0, blue: 47.0/255.0, alpha: 1.0)

    for view in self.subviews {
        if largeView.contains(String(describing: type(of: view))) {
            for v in view.subviews {
                if String(describing: type(of: v)) == "UILabel" {
                    var titleLabel = v as! UILabel
                    var labelRect = titleLabel.frame
                    let labelInsets = UIEdgeInsets(top: 10, left: 13, bottom: 0, right: 0)
                    let attrText = NSMutableAttributedString(string: "Jobs", attributes: [NSAttributedStringKey.font: UIFont(name: "SFProDisplay-Heavy", size: 30)!, NSAttributedStringKey.foregroundColor: labelcolor])

                    labelRect.origin.y += 20
                    let newLabel = UILabel(frame: labelRect)
                    newLabel.attributedText = attrText
                    titleLabel.text = ""
                    if labelRect.origin.y > 0 {
                        titleLabel = newLabel
                        titleLabel.drawText(in: UIEdgeInsetsInsetRect(labelRect, labelInsets))
                    }
                }
            }
        }
    }
}

刚刚发现在最新的iOS12版本中,如果单纯修改UINavigationBarlayoutMargins属性,这样会影响大标题。

let navigationBar = navigationController.navigationBar
navigationBar.layoutMargins.left = 36
navigationBar.layoutMargins.right = 36

我尝试了这里提到的关于使用自定义 NSMutableParagraphStyle 的解决方案。这确实有效,但是因为它拉伸了构成大标题的 UILabel 视图,当您向下滑动时,它在文本略微增长的地方播放的微妙动画变得非常扭曲。