ios - 如何在 iOS 7.0 或更高版本中获得自动调整的字体大小？

Question

我想获取某些文本在 UILabel 或 UITextField 中缩小后的字体大小。这在 iOS 7.0 之前是可能的:How to get UILabel (UITextView) auto adjusted font size? .但是，sizeWithFont 在 iOS 7.0 中已被弃用。我试过使用它的替代品 sizeWithAttributes，但没有成功。在 iOS 7.0 中有什么方法可以做到这一点吗？

Answer 1

这是我为获取 UILabel 的调整字体大小而创建的函数:

swift

func getApproximateAdjustedFontSizeWithLabel(label: UILabel) -> CGFloat {

    if label.adjustsFontSizeToFitWidth == true {

        var currentFont: UIFont = label.font
        let originalFontSize = currentFont.pointSize
        var currentSize: CGSize = (label.text! as NSString).sizeWithAttributes([NSFontAttributeName: currentFont])

        while currentSize.width > label.frame.size.width && currentFont.pointSize > (originalFontSize * label.minimumScaleFactor) {
            currentFont = currentFont.fontWithSize(currentFont.pointSize - 1)
            currentSize = (label.text! as NSString).sizeWithAttributes([NSFontAttributeName: currentFont])
        }

        return currentFont.pointSize

    }
    else {

        return label.font.pointSize

    }

}

objective-C

- (CGFloat)getApproximateAdjustedFontSizeWithLabel:(UILabel *)label {

    if (label.adjustsFontSizeToFitWidth) {

        UIFont *currentFont = label.font;
        CGFloat originalFontSize = currentFont.pointSize;
        CGSize currentSize = [label.text sizeWithAttributes:@{NSFontAttributeName : currentFont}];

        while (currentSize.width > label.frame.size.width && currentFont.pointSize > (originalFontSize * label.minimumScaleFactor)) {
            currentFont = [currentFont fontWithSize:currentFont.pointSize - 1];
            currentSize = [label.text sizeWithAttributes:@{NSFontAttributeName : currentFont}];
        }

        return currentFont.pointSize;
    }
    else {

        return label.font.pointSize;
    }
}