CODEWITHSUNDEEP
iphoneobjective-csqliteuitableview
user1645721
user1645721

Reputation: 653

How to implement Alphabetical section headers in a UITableView having content getting from DataBase

Till now I have implemented UITableView by populate the contents from the database

By retrieving in an array from sqlite data base

storedContactsArray = [Sqlitefile selectAllContactsFromDB];

so no multiple sections , section headers and returns storedContactsArray.count as number of rows.

Now i need to populate the same data in table view but The data set in Alpabetical sections in alphabetical order.

I tried with

alphabetsArray =[[NSMutableArray alloc]initWithObjects:@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z",nil];


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [alphabetsArray count];
}

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
      return alphabetsArray;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
      return [alphabetsArray objectAtIndex:section];
}

in need as follows

But in case of numberOfRowsInSection it fails since there is no contacts in storedContactsArray initially

Error occurs: -[__NSArrayM objectAtIndex:]: index 25 beyond bounds for empty array

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
  return [[storedContactsArray objectAtIndex:section] count]
}

any advice of use full links pls

Upvotes: 3

Views: 8375

Answers (1)

iDhaval
iDhaval

Reputation: 7844

To achieve your requirement you need to first separate out all the data in to section as Alphabetical order. which is as following.

Here section is a Mutable Dictionary in which we will get all data as alphabetical sets.

 //Inside ViewDidLoad Method

 sections = [[NSMutableDictionary alloc] init]; ///Global Object

 BOOL found;

for (NSString *temp in arrayYourData)
{        
    NSString *c = [temp substringToIndex:1];

    found = NO;

    for (NSString *str in [sections allKeys])
    {
        if ([str isEqualToString:c])
        {
            found = YES;
        }
    }

    if (!found)
    {     
        [sections setValue:[[NSMutableArray alloc] init] forKey:c];
    }
}
for (NSString *temp in arrayYourData)
{
    [[sections objectForKey:[temp substringToIndex:1]] addObject:temp];
}



-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[sections allKeys]count];
}


-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [[sections valueForKey:[[[sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:section]] count];
}


-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
      static NSString* CellIdentifier = @"Cell";
      UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
     if(cell == Nil)
     {
           cell  = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
     }
     NSString *titleText = [[sections valueForKey:[[[sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
     cell.textLabel.text = titleText;
     return cell;
 }

Please try it I am using it and it working fine Hope it helps you !!!

Upvotes: 17

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