UILabell自动调整宽度width

//属性要设成strong，不然初始化后会马上释放掉

<p class="p1"><span class="s1">@property</span><span class="s2"> (</span><span class="s1">strong</span><span class="s2">, </span><span class="s1">nonatomic</span><span class="s2">) </span><span class="s1">IBOutlet</span><span class="s2"> </span><span class="s3">UILabel</span><span class="s2"> *showHall;</span></p>

_showHall = [[UILabel alloc] init];
_showHall.text = _recordInfo.hallName;
[_showHall setFont:[UIFont fontWithName:@"Helvetica" size:15.0]];
_showHall.backgroundColor = AiMovieGreen;
_showHall.textColor = [UIColor whiteColor];

//不能通过storyboard创建label，不然没法重新设定frame
CGFloat labelWidth = [_showHall.text sizeWithAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Helvetica" size:15.0]}].width;
_showHall.frame = CGRectMake(162.0, 77.0, labelWidth, 21.0);
[self.tableView addSubview:_showHall];