給navigationItem中添加個搜索欄，效果和大部分程序一樣。代碼如下：

    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 200, 28)];

    searchBar.backgroundImage = [UIImage imageNamed:@"btu_search"];

    searchBar.placeholder = @"搜索";

    searchBar.delegate = self;

    UIBarButtonItem *searchButton = [[UIBarButtonItem alloc]initWithCustomView:searchBar];

    self.navigationItem.rightBarButtonItems = [NSArray arrayWithObject:searchButton];

    最後在- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar 方法裡面寫搜索方法就可以了。比較簡單，做個記錄。