// 生成AttributeString
-(NSAttributedString *)attributeWithLineSpace:(CGFloat)lineSpace font:(UIFont *)font color:(UIColor *)color withText:(NSString *)text{
NSParameterAssert(font && color);
if (text.length == 0) return nil;
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = lineSpace; //设置行间距
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
paragraphStyle.alignment = NSTextAlignmentLeft;
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:text attributes:@{NSFontAttributeName:font,NSForegroundColorAttributeName:color}];
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [text length])];
return [attributedString copy];
}
// 根据AttributeString计算高度
NSAttributedString *explaintAtt = [self attributeWithLineSpace:8 font:[UIFont pf_MediumFontOfSize:14] color:HEX_RGBA(0x333331, 1) withText:_newsModel.explain];
CGSize size = [explaintAtt boundingRectWithSize:CGSizeMake(SCREEN_WIDTH() - 44 - 33 , MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil].size;
// 注意这里取整加1
CGFloat height= ceil(size.height) + 1;
UILabel和UITextView的宽、高、行数等
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