1、生成view的xib
2、選中view、把剛剛新的UIView的Simulated Metrics的Size設置成Freeform,改變view的尺寸
3、在控制器中設置生成view的視圖,不要確定view的高度
MEDWorkDailyDetailHeader *header = [MEDWorkDailyDetailHeader header];
[header setNeedsLayout];
[header layoutIfNeeded];
header.autoresizingMask = UIViewAutoresizingFlexibleWidth;
header.delegate = self;
self.tableView.tableHeaderView = header;