swift - NSPopUpButton 子类 attributedTitle

Question

我对如何子类化 NSPopUpButton 感到困惑，即我无法像在按钮上那样设置 attributedTitle(以获取自定义字体、颜色和基线偏移)。

以下代码无效:

class CustomPopUpButton: NSPopUpButton {
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        self.wantsLayer = true
        self.layerContentsRedrawPolicy = .OnSetNeedsDisplay

        self.attributedTitle = NSAttributedString(string: self.title, attributes: [
            NSFontAttributeName: NSFont(name: "Impact", size: 15)!,
            NSForegroundColorAttributeName: NSColor(calibratedRed: 0.2, green: 0.270588235, blue: 0.031372549, alpha: 1),
            NSBaselineOffsetAttributeName: 2
        ])
    }
}

Answer 1

NSPopUpButton 显示选中的菜单项。当您设置菜单项的属性字符串时，弹出按钮将显示一个属性标题。