如何在iOS中计算非拉丁语文本宽度？

Question

我使用以下代码来获取乌尔都语的大小，但它计算的是错误的宽度，请帮我找到乌尔都语字符串的正确宽度。

 CGSize size = [str sizeWithAttributes:@{NSFontAttributeName: [UIFont fontWithName:@"Jameel-Noori-Nastaleeq" size:18.0f]}];

Answer 1

尝试以下方法。他们使用CoreText。

获取特定文本的高度，约束到特定宽度：

- (CGFloat) heightWithAttributedString:(NSAttributedString*)renderedAttributedText maxWidth:(CGFloat) width {

    if (!renderedAttributedText) {

        return 0.0;
    }

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFTypeRef)(renderedAttributedText));

    CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, 0), NULL, CGSizeMake(width, CGFLOAT_MAX), NULL);

    CFRelease(framesetter);

    return suggestedSize.height;
}

获取特定文本的宽度，约束到特定高度：

- (CGFloat) widthWithAttributedString:(NSAttributedString *)renderedAttributedText maxHeight:(CGFloat)height {

    if (!renderedAttributedText) {

        return 0.0;
    }

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFTypeRef)(renderedAttributedText));

    CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0, 0), NULL, CGSizeMake(CGFLOAT_MAX, height), NULL);

    CFRelease(framesetter);

    return suggestedSize.width;
}