label自适应高度,想必大家也都很熟悉怎么去做,上代码: UILabel *label3 = [[UILabel alloc]initWithFrame:CGRectMake(150, 50, 150, 0)]; label3.font = [UIFont systemFontOfSize:15]; label3.backgroundColor = [UIColor yellowColor]; label3.numberOfLines = 0; label3.text = str; CGSiz…