UILabel多行显示

//正文内容 body
    UILabel* lblBody = [[UILabel alloc]initWithFrame:CGRectMake(iv.frame.origin.x +iv.frame.size.width+10, 40, width-iv.frame.size.width-10-iv.frame.origin.x, 400)]; //标签高度尽可能设置大点，后面用sizeToFit会紧凑显示
    lblBody.numberOfLines=0;//多行显示
    lblBody.text=@"xxxxxxxxxxxxxxxxx";
    [lblBody sizeToFit];//紧凑显示