iOS UISearchBar

UISearchBar 经常是配合UITableView 一起使用的，一般都将UITableView的tableHeaderView属性设置为UISearchBar.使用UISearchBar需要实现UISearchBarDelegate 中的三个方法。

//取消按钮被点击的时候

-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar；

//搜索按钮被点击的时候

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar；

//搜索内容改变的时候，在这个方法里面实现实时显示结果

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

主要代码：

#import "SearchViewController.h"

@interface SearchViewController ()<UISearchBarDelegate,UISearchDisplayDelegate>
@property (nonatomic,strong) NSMutableArray * dataSource;
@property (nonatomic,strong) NSMutableArray * dataBase;
@property (nonatomic,strong) UISearchDisplayController * mySearchDisplayController;
@end

@implementation SearchViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization

    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    _dataSource =  [[NSMutableArray alloc] init];
    _dataBase = [[NSMutableArray alloc] init];
    for(int i = 0; i < 50; i++)
    {
        [_dataSource addObject:[NSString stringWithFormat:@"%d",i]];
        [_dataBase addObject:[NSString stringWithFormat:@"%d",i]];
    }
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
 
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    
    
    UISearchBar * searchBar = [[UISearchBar alloc] init];
    searchBar.frame = CGRectMake(0, 0, self.tableView.bounds.size.width, 0);
    searchBar.delegate = self;
    searchBar.keyboardType = UIKeyboardTypeNumberPad;
    searchBar.showsCancelButton = YES;
    searchBar.showsBookmarkButton = YES;
    searchBar.placeholder = @"请输入";
//    searchBar.barStyle = UIBarStyleBlack;
    searchBar.translucent = YES;
    searchBar.barStyle = UIBarStyleBlackTranslucent;
//    searchBar.tintColor = [UIColor redColor];
    searchBar.prompt = @"搜索";
    


    [searchBar sizeToFit];
    self.tableView.tableHeaderView = searchBar;
    

    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{

    // Return the number of sections.
    return 1;
}

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

    // Return the number of rows in the section.
    return [_dataSource count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
//    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    
    // Configure the cell...
    UITableViewCell *cell ;
    if(cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    
    cell.textLabel.text = [_dataSource objectAtIndex:indexPath.row];
    
    
    return cell;
}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}



-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    [_dataSource removeAllObjects];
    for(NSString * data in _dataBase)
    {
        if([data hasPrefix:searchBar.text])
        {
            [_dataSource addObject: data];
        }
    }
    
    [self.tableView reloadData];
    [searchBar resignFirstResponder];
}


-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
    searchBar.text = @"";
    [searchBar resignFirstResponder];
}

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if(0 == searchText.length)
    {
        return ;
        
    }
    
    [_dataSource removeAllObjects];
    for(NSString * str in _dataBase)
    {
        if([str hasPrefix:searchText])
        {
            [_dataSource addObject:str];
        }
    }
    
    [self.tableView reloadData];
}





@end