電話本的檢索功能

設置帶有導航欄的根視圖控制器

RootViewController.h

@interface RootViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,UITextFieldDelegate>
{
    UITableView *_tableView;
}

@property(nonatomic, retain)NSArray *data;  //存放原本的數據
@property(nonatomic, retain)NSArray *filterData;    //用於存放刪選後的數據

RootViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //創建輸入框
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 200, 30)];
    textField.delegate = self;
    textField.borderStyle = UITextBorderStyleRoundedRect;
    //關閉大寫
    textField.autocapitalizationType = UITextAutocapitalizationTypeNone;
    self.navigationItem.titleView = textField;
    [textField release];
    
    //創建表視圖
    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 480) style:UITableViewStylePlain];
    _tableView.delegate = self;
    _tableView.dataSource = self;
    [self.view addSubview:_tableView];
    
    //取得數據
    /*
     [@"1",@"2"]
     */
    _data = [[UIFont familyNames] retain];
    _filterData = [_data retain];
    
    //註冊一個通知
    //輸入框裏面的內容發生改變的時候發送通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeAction:) name:UITextFieldTextDidChangeNotification object:nil];
    
}

- (void)changeAction:(NSNotification *)notificiation {

   //輸入框輸入的內容
    NSLog(@"%@",notificiation.object);
    UITextField *textField = notificiation.object;
    

    //定義謂詞
    //[c]標示不區分大小寫
    NSString *t = [NSString stringWithFormat:@"self like [c]'*%@*'",textField.text];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:t];
    //過濾元素
    self.filterData = [_data filteredArrayUsingPredicate:predicate];

    //刷新視圖
    [_tableView reloadData];
    
}

#pragma mark - UITableView dataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return _filterData.count;
}

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

    static NSString *iden = @"cell110";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:iden];
    
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden] autorelease];
    }
    
    cell.textLabel.text = _filterData[indexPath.row];
    
    return cell;
    
}

#pragma mark - UITextField delegate
//- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
//
//    /*
//     textField.text裏面存放是用戶以前輸入的內容
//     string:標示用戶剛剛輸入的字符
//     */
//    
//    NSLog(@"textField:%@",textField.text);
//    NSLog(@"string:%@",string);
//    
//    //輸入框輸入的內容
//    NSString *text = [NSString stringWithFormat:@"%@%@",textField.text,string];
//  
//    //定義謂詞
//    //[c]標示不區分大小寫
//    NSString *t = [NSString stringWithFormat:@"self like [c]'*%@*'",text];
//    NSPredicate *predicate = [NSPredicate predicateWithFormat:t];
//    
//    //過濾元素
//    self.filterData = [_data filteredArrayUsingPredicate:predicate];
//    
//    //刷新視圖
//    [_tableView reloadData];
//    
//    
//    return YES;
//}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

    //收起鍵盤
    [textField resignFirstResponder];
    
    return YES;
    
}