Question

我通过使用以下代码

对其进行子类化来实现自定义导航栏高度

class TMNavigationBar: UINavigationBar {

    ///The height you want your navigation bar to be of
    static let navigationBarHeight: CGFloat = 44.0

    ///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 = TMNavigationBar.heightIncrease/2

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

    override func layoutSubviews() {
        super.layoutSubviews()

        let shift = TMNavigationBar.heightIncrease/2

        ///Move the background down for [shift] point
        let classNamesToReposition: [String] = ["_UINavigationBarBackground"]
        for view: UIView in self.subviews {
            if classNamesToReposition.contains(NSStringFromClass(view.dynamicType)) {
                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 = CGSizeMake(amendedSize.width, TMNavigationBar.navigationBarHeight);
        return newSize;
    }
}

仅在iOS 10上出现以下问题:(条形图和视图之间的黑色空间）

不知道那里发生了什么。但是在故事板中，它产生了这个警告，并且没有办法在IB中修复它（仅当我在IB中更改导航栏的子类时才会出现警告）。

Answer 1

适用于iOS 10，Swift 3.0：

extension UINavigationBar {
    open override func sizeThatFits(_ size: CGSize) -> CGSize {
        let screenRect = UIScreen.main.bounds
        return CGSize(width: screenRect.size.width, height: 64)
    }
}

Answer 2

我检查了界面调试器，这就是我所看到的（所以基本上它试图改变导航栏的高度，将它保持不变并且它只显示黑色空间 - 这是窗口色）：

随后的调查我注意到它没有打电话：＆＃34; _UINavigationBarBackground＆＃34;

然后我从快速枚举中检查了view.classForCoder，发现密钥已更改为＆＃34; _UIBarBackground＆＃34;，所以我更新了layoutSubviews（）：

override func layoutSubviews() {
    super.layoutSubviews()

    let shift = TMNavigationBar.heightIncrease/2

    ///Move the background down for [shift] point
    let classNamesToReposition = isIOS10 ? ["_UIBarBackground"] : ["_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
        }
    }
}

干杯。

iOS 10自定义导航栏高度

2 个答案: