label自适应

 //lalalabel自适应

    self.label = [UILabel new];

    self.label.font = [UIFont systemFontOfSize:14];

    NSString *titleContent = @"亲，欢迎您通过以下方式与我们的营销顾问取得联系，交流您再营销推广工作中遇到的问题，营销顾问将免费为您提供咨询服务。亲，欢迎您通";

    self.label.text = titleContent;

   self.label.textAlignment = NSTextAlignmentRight;

    self.label.textColor = [UIColor redColor];

    self.label.numberOfLines = 0;//多行显示，计算高度

    CGSize titleSize = [titleContent boundingRectWithSize:CGSizeMake(self.view.frame.size.width -80, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} context:nil].size;

    self.label.frame = CGRectMake(40,40, titleSize.width, titleSize.height);

    [self.view addSubview:self.label];

原文：http://www.cnblogs.com/wujie123/p/5263640.html