label 调整label高度

//    CGFloat width1=[(NSString *)ob1 boundingRectWithSize:CGSizeMake(1000, FONTHEIGHT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16]} context:nil].size.width;
//    
//boundingRectWithSize: CGSize 对应 constrainedToSize: CGSize
//attributes:@{NSFontAttributeName: [ UIFont ] }
对应 sizeWithFont[ UIFont ]
//options: NSStringDrawingUsesLineFragmentOrigin
默认照填
//context: nil 默认照填

// - 返回一行的时候 str 的尺寸. 

CGSize size = [str sizeWithAttributes:dic];

CGSize size = [@"sdfsf" sizeWithAttributes:@{ NSFontAttributeName : [UIFont systemFontOfSize:12]}];