UILabel换行显示 效果如下

*lab=[[UILabelalloc]initWithFrame:CGRectMake(0,100, 300, 200)];

    lab.numberOfLines =0;

    lab.backgroundColor=[UIColorredColor];

    lab.text=@"+打上大大的\n-就是大开发和\n-就是打卡回复";

    [self.viewaddSubview:lab];

    

    

    NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc] initWithString:lab.text];

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStylealloc] init];

    [paragraphStylesetLineSpacing:5];//调整行间距

    [attributedStringaddAttribute:NSParagraphStyleAttributeNamevalue:paragraphStyle range:NSMakeRange(0, [lab.textlength])];

    lab.attributedText = attributedString;

    lab.textColor=[UIColorwhiteColor];

    lab.font=[UIFontsystemFontOfSize:14];

    lab.lineBreakMode =NSLineBreakByCharWrapping;

    lab.textAlignment=NSTextAlignmentRight；