Answer 1

我通过创建一个覆盖字符串绘图的NSTextFieldCell子类来解决它。它查看字符串是否适合，如果不适合它会减小字体大小，直到它适合。这可以提高效率，我不知道当cellFrame的宽度为0时它会如何表现。然而，根据我的需要，它是Good Enough™。

- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
{
    NSAttributedString *attributedString;
    NSMutableAttributedString *mutableAttributedString;
    NSSize stringSize;
    NSRect drawRect;

    attributedString = [self attributedStringValue];

    stringSize = [attributedString size];
    if (stringSize.width <= cellFrame.size.width) {
        // String is already small enough. Skip sizing.
        goto drawString;
    }

    mutableAttributedString = [attributedString mutableCopy];

    while (stringSize.width > cellFrame.size.width) {
        NSFont *font;

        font = [mutableAttributedString
            attribute:NSFontAttributeName
            atIndex:0
            effectiveRange:NULL
        ];
        font = [NSFont
            fontWithName:[font fontName]
            size:[[[font fontDescriptor] objectForKey:NSFontSizeAttribute] floatValue] - 0.5
        ];

        [mutableAttributedString
            addAttribute:NSFontAttributeName
            value:font
            range:NSMakeRange(0, [mutableAttributedString length])
        ];

        stringSize = [mutableAttributedString size];
    }

    attributedString = [mutableAttributedString autorelease];

drawString:
    drawRect = cellFrame;
    drawRect.size.height = stringSize.height;
    drawRect.origin.y += (cellFrame.size.height - stringSize.height) / 2;
    [attributedString drawInRect:drawRect];
}

Answer 2

Answer 3