如何在UINavigationBar上添加UISearchBar以及UISearchDisplayController的使用 --OC --iOS

那我们开始吧，下面是Sely写的一个Demo，分享给大家。

新建一个项目， UISearchDisplayController 的 displaysSearchBarInNavigationBar太死板了，达不到想要的效果。

这里进行重新定制， 四个协议， 三个成员变量，第一步OK。

@interface ViewController ()<UISearchBarDelegate,UISearchDisplayDelegate, UITableViewDataSource, UITableViewDelegate>

{

UISearchBar *mySearchBar;

UISearchDisplayController *mySearchDisplayController;

NSMutableArray *suggestResults;

}

@end

//下面我们来初始化我们的三个成员

-(void)initMysearchBarAndMysearchDisPlay

{

mySearchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, [UIApplicationsharedApplication].statusBarFrame.size.height, [UIScreen mainScreen].bounds.size.width, 44)];

mySearchBar.delegate = self;

//设置选项

mySearchBar.barTintColor = [UIColor redColor];

mySearchBar.searchBarStyle = UISearchBarStyleDefault;

mySearchBar.translucent = NO; //是否半透明

[mySearchBar setAutocapitalizationType:UITextAutocapitalizationTypeNone];

[mySearchBar sizeToFit];

mySearchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:mySearchBar contentsController:self];

mySearchDisplayController.delegate = self;

mySearchDisplayController.searchResultsDataSource = self;

mySearchDisplayController.searchResultsDelegate = self;

suggestResults = [NSMutableArray arrayWithArray:@[@"此处为推荐词", @"也可以为历史记录"]];

}

//然后呢当然是自定义我们的navigation bar了

-(void)initNavigationBar

{

UIButton *moreButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];

[moreButton setImage:[UIImage imageNamed:@"more"] forState:UIControlStateNormal];

[moreButton addTarget:self action:@selector(handleMore:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *moreItem = [[UIBarButtonItem alloc] initWithCustomView:moreButton];

UIButton *searchButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];

[searchButton setImage:[UIImage imageNamed:@"info_search"] forState:UIControlStateNormal];

[searchButton addTarget:self action:@selector(startSearch:) forControlEvents:UIControlEventTouchUpInside];

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

self.navigationItem.rightBarButtonItems = @[moreItem, searchItem];

}

//好了， 开始加载界面了

- (void)viewDidLoad

{

[super viewDidLoad];

[self initNavigationBar];

[self initMysearchBarAndMysearchDisPlay];

}

//实现我们的点击事件

#pragma mark - handle button click

-(void) startSearch:(id)sender

{

[self.navigationController.view addSubview:mySearchBar];

[mySearchBar becomeFirstResponder];

}

-(void) handleMore:(id)sender

{}

//实现我们的table view 的协议，判断当我们开始搜索时，转到自己实现的一个searchDisplayController方法里，这样代码看起来是不是很简洁？

#pragma mark - UITableViewDataSource & UITableViewDelegate

-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

if (tableView == mySearchDisplayController.searchResultsTableView)

{

return [self numberOfRowsWithSearchResultTableView];

}

return 0;

}

-(UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

if (tableView == mySearchDisplayController.searchResultsTableView)

{

return [self searchTableView:mySearchDisplayController.searchResultsTableView cellForRowAtIndexPath:indexPath];

}

else

{

static NSString *cellID = @"search_cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];

if (cell == nil)

{

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];

}

return cell;

}

}

//这里专门写UISearchDisplayController 中 searchResultsTableView 的 data source 和 delegate

#pragma mark - UISearchDisplayController   <UITableViewDataSource> dataSource

-(NSInteger)numberOfRowsWithSearchResultTableView

{

return suggestResults.count + 1;

}

-(UITableViewCell*)searchTableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *suggestId = @"suggestCell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:suggestId];

if (cell == nil)

{

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:suggestId];

cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

}

if (indexPath.row == suggestResults.count)

{

cell.textLabel.text = [NSLocalizedString(@"Search: ", @"查找: ") stringByAppendingString:mySearchBar.text];

}

else

{

cell.textLabel.text = [suggestResults objectAtIndex:indexPath.row];

}

return cell;

}

#pragma mark - UISearchDisplayController <UITableViewDelegate> delegate

-(void) searchTableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

NSString *keyword = nil;

if (indexPath.row == suggestResults.count)

{

keyword = mySearchBar.text;

}

else

{

keyword = [suggestResults objectAtIndex:indexPath.row];

}

[mySearchBar resignFirstResponder];

}

//开始我们的search bar delegate，输入搜索内容， 因为是Demo ，所以我并没有搜索结果，这个大家根据需求自己实现吧

#pragma mark - UISearchBarDelegate

-(BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar

{

return YES;

}

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar

{

}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText

{

[mySearchDisplayController.searchResultsTableView reloadData];

}

//最后的环节了, 这个地方的逻辑就会千变万化了

#pragma mark - UISearchDisplayDelegate

- (void) searchDisplayControllerDidBeginSearch:(UISearchDisplayController *)controller NS_DEPRECATED_IOS(3_0,8_0)

{

//开始搜索事件,设置searchResultsTableView的contentInset，否则位置会错误

mySearchDisplayController.searchResultsTableView.contentInset = UIEdgeInsetsMake(mySearchBar.frame.size.height, 0, 0, 0);

}

- (void)searchDisplayController:(UISearchDisplayController *)controller didLoadSearchResultsTableView:(UITableView *)tableViewNS_DEPRECATED_IOS(3_0,8_0)

{

//加载searchResultsTableView完毕

}

- (void) searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller NS_DEPRECATED_IOS(3_0,8_0)

{

//结束搜索事件,移除mySearchBar

[mySearchBar removeFromSuperview];

}

// return YES to reload table. called when search string/option changes. convenience methods on top UISearchBar delegate methods

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString*)searchString NS_DEPRECATED_IOS(3_0,8_0)

{

//是否需要刷新searchResultsTableView

if(@"符合条件")

{

return YES;

}

return NO;

}

就到这里结束，是不是很容易？ 这是第一次发布，如果做的不好，请大神指正，如果文笔不好(估计是肯定的)，也请多指教，最后希望能多多帮助到大家。

源码地址

Sely 原创