“`rightBarButtonItem`”不垂直对齐

Question

我的UIViewController中的问题是，rightBarButtonItem不垂直对齐。我想把按钮向下移动10个像素。

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let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(didPressCancelButton))
navigationItem.setRightBarButton(cancelButton, animated: true)
navigationItem.rightBarButtonItem?.setBackgroundVerticalPositionAdjustment(12, for: .default)                  navigationItem.rightBarButtonItem?.setTitlePositionAdjustment(UIOffset(horizontal: 0, vertical: 12), for: .default)

我还尝试在viewDidLayoutSubviews()中移动代码，但没有做什么。

当前配置：iOS 11

Answer 1

您可以使用自定义视图创建UIBarButtonItem。这个自定义视图将是一个UIView，实际的UIButton (作为子视图)从顶部放置x像素(要向下移动的像素的x=the数)。

下面是如何这样做的一个例子：

var button = UIButton(type: .custom)
button.setTitle("Settings", for: .normal)
button.titleLabel?.font = UIFont.systemFont(ofSize: 14.0)
button.setTitleColor(UIColor(red: 179.0 / 255.0, green: 40.0 / 255.0, blue: 18.0 / 255.0, alpha: 1), for: .normal)
button.frame = CGRect(x: 0, y: 0, width: 50, height: 20)
button.addTarget(self, action: #selector(self.yourCustomSelectorHere), for: .touchUpInside)

var backButtonView = UIView(frame: CGRect(x: 0, y: 0, width: 63, height: 33))
    backButtonView.bounds = backButtonView.bounds.offsetBy(dx: -14, dy: -7)
    backButtonView.addSubview(button)
    var barBtnItem = UIBarButtonItem(customView: backButtonView)
    navigationItem?.rightBarButtonItem = barBtnItem

您只需要稍微配置代码，使其在视图中处于正确的位置。