如何告诉nstextfield自动调整字体大小以适应文本?[副本]

我通过创建一个nstextfieldsell子类来解决这个问题,它覆盖了字符串绘制。它检查字符串是否合适,如果不合适,它会减小字体大小,直到合适为止。这可以提高效率,我不知道当 cellFrame 宽度为0。不过,这足以满足我的需要。

- (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];
}

别忘了看超类。nstextfield是一种nscontrol,每个nscontrol都响应 the sizeToFit message .

我用了杰里·克里诺克的优秀的ns(归因)弦+几何。 (located here) 一个像下面这样的小方法。我仍然对更简单的方法感兴趣。

- (void) prepTextField:(NSTextField *)field withString:(NSString *)string
{   
    #define kMaxFontSize 32.0f
    #define kMinFontSize 6.0f
    float fontSize = kMaxFontSize;
    while (([string widthForHeight:[field frame].size.height font:[NSFont systemFontOfSize:fontSize]] > [field frame].size.width) && (fontSize > kMinFontSize))
    {
            fontSize--;
    }
    [field setFont:[NSFont systemFontOfSize:fontSize]];

    [field setStringValue:string];

    [self addSubview:field];
}