如何获得UILabel(UITextView)自动调整字体大小？

Question

自动调整后是否可以获得最终字体大小？(属性adjustsFontSizeToFitWidth设置为YES,文本字体大小正在缩小以适合标签)

我在UILabel中继承了drawTextInRect以在文本上放置渐变,但是渐变大小需要与字体的大小相同.我无法获得适当大小的调整字体......它甚至可能吗？

  //draw gradient

    CGContextSaveGState(myContext);
        CGGradientRef glossGradient;
        CGColorSpaceRef rgbColorspace;
        size_t num_locations = 2;
        CGFloat locations[2] = { 0.0, 1.0 };
        CGFloat components[8] = { 1, 1, 1, 0.25,  // BOTTOM color
            1, 1, 1, 0.12 }; // UPPER color

    //scale and translate so that text would not be rotated 180 deg wrong
        CGContextTranslateCTM(myContext, 0, rect.size.height);
        CGContextScaleCTM(myContext, 1.0, -1.0);

//create mask
        CGImageRef alphaMask = CGBitmapContextCreateImage(myContext);
        CGContextClipToMask(myContext, rect, alphaMask);

        rgbColorspace = CGColorSpaceCreateDeviceRGB();
        glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);

    //gradient should be sized to actual font size. THIS IS THE PROBLEM - EVEN IF FONT IS AUTO ADUJSTED, I AM GETTING THE SAME ORIGINAL FONT SIZE!!!

        CGFloat fontCapHeightHalf = (self.font.capHeight/2)+5;
            CGRect currentBounds = rect;
        CGPoint topCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMidY(currentBounds)-fontCapHeightHalf);
        CGPoint midCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMidY(currentBounds)+fontCapHeightHalf);

        CGContextDrawLinearGradient(myContext, glossGradient, topCenter, midCenter, 0);

        CGGradientRelease(glossGradient);
        CGColorSpaceRelease(rgbColorspace);
    CGContextRestoreGState(myContext);

Answer 1

您无法直接获得大小,但您可以使用以下函数轻松地计算它:

CGFloat actualFontSize;
[label.text sizeWithFont:label.font
             minFontSize:label.minimumFontSize
          actualFontSize:&actualFontSize
                forWidth:label.bounds.size.width
           lineBreakMode:label.lineBreakMode];