iOS设置UILabel的行间距

NSString *textStr = @"iPhone规定：任何应用想访问麦克风，必须被授权麦克风服务。请进入“设置”->“隐私”->“麦克风”中打开QQ空间的麦克风服务。";

UIFont *textFont = [UIFont systemFontOfSize:14];

CGSize textSize = [textStr sizeWithFont:textFont

constrainedToSize:CGSizeMake(bounds.size.width - 40, QZONE_SCREEN_HEIGHT)];;

UILabel *openMicPrivilegeTipsLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, textSize.width, textSize.height)];

openMicPrivilegeTipsLabel.textColor = DefaultDescriptionText2ColorInDefaultTheme;

openMicPrivilegeTipsLabel.text = textStr;

openMicPrivilegeTipsLabel.backgroundColor = [UIColor clearColor];

openMicPrivilegeTipsLabel.textAlignment = UITextAlignmentLeft;

openMicPrivilegeTipsLabel.font = [UIFont systemFontOfSize:14];

openMicPrivilegeTipsLabel.numberOfLines = 0;

// 调整行间距

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:textStr];

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

[paragraphStyle setLineSpacing:6];

[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [textStr length])];

openMicPrivilegeTipsLabel.attributedText = attributedString;

[_tipsBG addSubview:openMicPrivilegeTipsLabel];

[openMicPrivilegeTipsLabel sizeToFit];