NSPopUpButton白色文本

Question

我已经在我的应用程序中创建了一个具有黑色填充的自定义视图中的NSPopUpButton。我现在想使NSPopUpButton具有白色文本颜色，但我似乎无法做到这一点。我该怎么做呢？

谢谢

Answer 1

这很简单。你只需要重写-NSPopUpButtonCell :withFrame:inView，然后就可以改变标题的所有内容，比如颜色、字体、边框等等。希望这能对你有所帮助。

Objective-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)
        }
    }
}

Answer 2

使用-[NSButton setAttributedTitle:]，记住NSPopUpButton是NSButton的子类。制作属性标题的可变副本，将其前景颜色设置为白色，然后将其设置为新的属性标题。

NSMutableAttributedString* myTitle = [[button.attributedTitle mutableCopy] autorelease];
NSRange allRange = NSMakeRange( 0, [myTitle length] );
myTitle addAttribute: NSForegroundColorAttributeName
    value: [NSColor whiteColor]
    range: allRange];
button.attributedTitle = myTitle;