未返回属性文本的高度

Question

我需要在 UITableViewCell 中显示文字，需要设置 tableView 的高度。我正在使用以下方法动态计算行高。但是身高比实际身高要高很多。

+ (CGFloat)getquestionLabelHeight:(NSNumber *)width text:(NSString *)text {
CGSize constraint = CGSizeMake([width floatValue], CGFLOAT_MAX);
NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init];
CGSize boundingBox = [[ZUtility getAttributedText:text].string boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin
                                                          attributes:@{NSFontAttributeName:[UIFont fontWithName:@"OpenSans" size:14]} context:context].size;
return boundingBox.height;
}

我将文本转换为属性文本的原因是因为普通文本具有 html 内容，并且存在换行符“&nbsp”。

+(NSAttributedString *)getAttributedText:(NSString *)text {
NSMutableAttributedString *attrHTMLText = [[[NSAttributedString alloc] initWithData:[text dataUsingEncoding:NSUTF8StringEncoding] options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)} documentAttributes:nil error:nil] mutableCopy];
[attrHTMLText addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"OpenSans" size:14.0] range:NSMakeRange(0, attrHTMLText.length)];
[attrHTMLText addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0, attrHTMLText.length)];
return attrHTMLText;
}

对于宽度 343，高度是 915，这是不准确的。

Answer 1

你可以使用 boundingRectWithSize

 NSAttributedString *attrStr = [[NSAttributedString alloc]initWithString:@"<p>The HTML <strong>&lt;strong&gt;</strong> element defines <strong>strong</strong>text, with added semantic importance.</p>"];

    // your attributed string
    CGFloat width = 200; // whatever your desired width is
    CGRect rect = [attrStr boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil];;

    NSLog(@"%@",NSStringFromCGRect(rect));