使用masonry约束UITableView的tableHead

为未来的CV埋下伏笔~~~

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    CustomerHeaderView *header = (CustomerHeaderView *)self.tableView.tableHeaderView;
    if (!header) {
        return;
    }
    CGSize size = [header systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
    if (header.frame.size.height != size.height) {
        CGRect frame = header.frame;
        frame.size.height = size.height;
        header.frame = frame;
        self.tableView.tableHeaderView = header;
    }
    
}