方法：

封装了以下方法，传入参数调整行间距

- (NSAttributedString *)getAttributedStringWithString:(NSString *)string lineSpace:(CGFloat)lineSpace {NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];paragraphStyle.lineSpacing = lineSpace;// 调整行间距NSRange range = NSMakeRange(0, [string length]);[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:range];return attributedString;
}

调用：

NSAttributedString *attstring = [self getAttributedStringWithString:@"12345678901234567890" lineSpace:3];
[_label setAttributedText:attstring];