未进行两端对齐格式时，文字显得参差不齐

对齐前效果

设置两端对齐后的效果

对齐效果

废话不多说，直接上代码

 NSMutableAttributedString *mutaString = [[NSMutableAttributedString alloc]initWithString:model.describestring];
    NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc]init];
    paraStyle.alignment = NSTextAlignmentJustified;//两端对齐
    paraStyle.paragraphSpacing = 14.0;//行后间距
    NSDictionary *dic = @{
                          NSForegroundColorAttributeName:[UIColor blackColor],
                          NSFontAttributeName:[UIFont systemFontOfSize:14],
                          NSParagraphStyleAttributeName:paraStyle,
                          NSUnderlineStyleAttributeName:[NSNumber numberWithInteger:NSUnderlineStyleNone]
                          };
    [mutaString setAttributes:dic range:NSMakeRange(0, mutaString.length)];
    _describeLabel.attributedText = mutaString;