ios - 如何在 Swift 中增加自定义 UINavigationBar 类的高度

Question

更新:我最终隐藏了默认导航栏并添加了一个看起来与导航栏相同的 UIView。这听起来可能不太好，但不是修补到 UINavigationBar 这很好。

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这是我创建的自定义 UINavigationBar 类，用于增加应用中导航栏的高度。它对我不起作用。这是 code .

class PPBaseNavigationBar: UINavigationBar {

    ///The height you want your navigation bar to be of
    static let navigationBarHeight: CGFloat = 83.0

    ///The difference between new height and default height
    static let heightIncrease: CGFloat = navigationBarHeight - 44

    override init(frame: CGRect) {
        super.init(frame: frame)
        initialize()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initialize()
    }

    private func initialize() {
        let shift = PPBaseNavigationBar.heightIncrease/2.0

        ///Transform all view to shift upward for [shift] point
        self.transform = CGAffineTransform(translationX: 0, y: -shift)
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        let shift = PPBaseNavigationBar.heightIncrease/2.0

        ///Move the background down for [shift] point
        var classNamesToReposition: Array<String>?
        if #available(iOS 10.0, *) {
            classNamesToReposition = ["_UIBarBackground"]
        } else {
            classNamesToReposition =  ["_UINavigationBarBackground"]
        }

        for view: UIView in self.subviews {
            if (classNamesToReposition?.contains(NSStringFromClass(view.classForCoder)))! {
                let bounds: CGRect = self.bounds
                var frame: CGRect = view.frame
                frame.origin.y = bounds.origin.y + shift - 20.0
                frame.size.height = bounds.size.height + 20.0
                view.frame = frame
            }
        }
    }

    override func sizeThatFits(_ size: CGSize) -> CGSize {
        let amendedSize:CGSize = super.sizeThatFits(size)
        let newSize:CGSize = CGSize.init(width: amendedSize.width, height: PPBaseNavigationBar.navigationBarHeight)
        return newSize;
    }
}

除了 override func sizeThatFits(_ size: CGSize) -> CGSize {...} 之外的所有方法都被调用，不确定，为什么？

Answer 1

It is not permissible to change the navigation bar object or modify its bounds, frame, or alpha values directly. 

Modifying the Navigation Bar Object Directly

您可以使用自定义 View 作为导航栏。根据您的要求自定义 View (例如更改高度)并将默认导航栏隐藏为

self.navigationController?.setNavigationBarHidden(true, animated: false)