iOS label中sizeToFit的使用

 UILabel *enterpriseAddress1=[[UILabel alloc]initWithFrame:CGRectMake(90, 130, 180, 20)];

            enterpriseAddress1.font = [UIFont systemFontOfSize:13]

            enterpriseAddress1.text = [NSString stringWithFormat:@"%@ %@",self.placeText,self.StoreMessage.address];

            [scrollView addSubview:enterpriseAddress1];

            [enterpriseAddress1 sizeToFit];

注：sizeToFit應放在[scrollView addSubview:enterpriseAddress1]的後面，否則文字無法顯示；