iOS 之 UITableView 使用索引

 在開發app中，經常會使用到UITableView，今天無聊做了一個demo，UITableView顯示索引。 顯示索引實現的委託方法主要是：

//返回section的個數

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

//返回索引數組

-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView

//返回每個索引的內容

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

//響應點擊索引時的委託方法

-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index

.h文件：

1 2 3 4 5

#import <UIKit/UIKit.h>   @interface CContactListViewController : UITableViewController   @end

  .m文件：

//

//  CContactListViewController.m

//  Contact

//

//  Created by Carl on 13-6-26.

//  Copyright (c) 2013年 contact..com. All rights reserved.

//

 

#import "CContactListViewController.h"

 

@interface CContactListViewController ()

@property NSMutableArray * dataSource, * dataBase;

@end

 

@implementation CContactListViewController

 

- (id)initWithStyle:(UITableViewStyle)style

{

    self = [super initWithStyle:style];

    if (self) {

        // Custom initialization

    }

    return self;

}

 

- (void)viewDidLoad

{

    [super viewDidLoad];

 

    // 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;

     

    self.navigationItem.rightBarButtonItem = self.editButtonItem;

     

    UISearchBar * searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 0)];

    searchBar.translucent = YES;

    searchBar.barStyle = UIBarStyleBlackTranslucent;

    searchBar.showsCancelButton = YES;

    [searchBar sizeToFit];

    [self.tableView setTableHeaderView:searchBar];

     

    //改變索引的顏色

    self.tableView.sectionIndexColor = [UIColor blueColor];

    //改變索引選中的背景顏色

    self.tableView.sectionIndexTrackingBackgroundColor = [UIColor grayColor];

 

     

     

    //索引數組

    _dataSource = [[NSMutableArray alloc] init] ;

     

    //tableview 數據源

    _dataBase = [[NSMutableArray alloc] init] ;

     

    //初始化數據

    for(char c = 'A'; c <= 'Z'; c++ )

    {

        [_dataSource addObject:[NSString stringWithFormat:@"%c",c]];

        [_dataBase addObject:[NSString stringWithFormat:@"%c",c]];

        [_dataBase addObject:[NSString stringWithFormat:@"%c",c]];

        [_dataBase addObject:[NSString stringWithFormat:@"%c",c]];

    }

     

     

}

 

 

-(void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    NSLog(@"viewWillAppear");

}

 

-(void)viewDidAppear:(BOOL)animated

{

    NSLog(@"viewDidAppear");

    [super viewDidAppear:animated];

     

     

    //取消選中的cell

    NSArray * indexPaths = [self.tableView indexPathsForSelectedRows];

     

    for(NSIndexPath * indexPath in indexPaths)

    {

        [self.tableView deselectRowAtIndexPath:indexPath animated:YES];

    }

 

}

 

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

#pragma mark - Table view data source

 

 

 

//返回索引數組

-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView

{

    return _dataSource;

}

 

//響應點擊索引時的委託方法

-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index

{

    NSInteger count = 0;

     

    NSLog(@"%@-%d",title,index);

     

    for(NSString *character in _dataSource)

    {

        if([character isEqualToString:title])

        {

            return count;

        }

        count ++;

    }

    return 0;

}

 

 

//返回section的個數

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

 

    // Return the number of sections.

    return [_dataSource count];

}

 

//返回每個索引的內容

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

    return [_dataSource objectAtIndex:section];

}

 

//返回每個section的行數

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

{

 

    return 3;

}

 

 

//cell內容

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

{

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

     

    if(cell == nil)

    {

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

    }

     

    cell.textLabel.text = [_dataBase objectAtIndex:indexPath.section * 3 + 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;

}

 

-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath

{

    return UITableViewCellEditingStyleDelete | UITableViewCellEditingStyleInsert;

}

 

 

 

#pragma mark - Table view delegate

 

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

{

     

}

 

@end