navBar 上添加searchBar

//导航条的搜索条
UISearchBar *searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(500.0f,0.0f,250.0f,44.0f)];
searchBar.delegate = self;
[searchBar setPlaceholder:@"搜索"];

//将搜索条放在一个UIView上
UIView *searchView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 768, 44)];
searchView.backgroundColor = [UIColor clearColor];
[searchView addSubview:searchBar];

self.navigationItem.titleView = searchView;
[searchBar release];
[searchBiew release];

UISearchBar* searchBar=[[[UISearchBar alloc]initWithFrame:CGRectMake(560, 0, 150,40)]autorelease];

//searchBar.delegate = self;
[searchBar setPlaceholder:@"search"];
[self.navigationController.navigationBar addSubview:searchBar];