macos - NSPopUpButton 白色文本

Question

我在我的应用程序中的自定义 View 中创建了一个 NSPopUpButton，该 View 具有黑色填充。我现在想让 NSPopUpButton 具有白色文本颜色，但我似乎无法做到这一点。我应该怎么做？

谢谢

Answer 1

这很简单。你只需要重写-[NSPopUpButtonCell drawTitle:withFrame:inView]，然后就可以改变关于标题的一切，比如颜色、字体、框架等等。下面是一个例子。希望对您有所帮助。

目标-C:

@interface MyPopUpButtonCell : NSPopUpButtonCell

@property (nonatomic, readwrite, copy) NSColor *textColor;

@end

@implementation MyPopUpButtonCell

- (NSRect)drawTitle:(NSAttributedString*)title withFrame:(NSRect)frame inView:(NSView*)controlView {
        NSRect newFrame = NSMakeRect(NSMinX(frame), NSMinY(frame)+2, NSWidth(frame), NSHeight(frame));
        if (self.textColor) {
            NSMutableAttributedString *newTitle = [[NSMutableAttributedString alloc] initWithAttributedString:title];
            NSRange range = NSMakeRange(0, newTitle.length);
            [newTitle addAttribute:NSForegroundColorAttributeName value:self.textColor range:range];
            return [super drawTitle:newTitle withFrame:newFrame inView:controlView];
        }else {
            return [super drawTitle:title withFrame:newFrame inView:controlView];
        }
    }

@end

swift :

class MyPopUpButtonCell: NSPopUpButtonCell {
   var textColor: NSColor? = nil

   override
   func drawTitle(_ title: NSAttributedString, withFrame frame: NSRect, in controlView: NSView) -> NSRect {
        if self.textColor != nil {
            let attrTitle = NSMutableAttributedString.init(attributedString: title)
            let range = NSMakeRange(0, attrTitle.length)
            attrTitle.addAttributes([NSAttributedString.Key.foregroundColor : self.textColor!], range: range)
            return super.drawTitle(attrTitle, withFrame: frame, in: controlView)
        }else {
            return super.drawTitle(title, withFrame: frame, in: controlView)
        }
    }
}