numberofSectionInTablesView/NumberofRowsInsection - iphone

Question

I am having trouble returning the numberofSections/numberofRows. I have a dictionary full of data
-(void)setUpContacts{
//set up the contacts
NSString *string = #"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
letterArray = [[NSMutableDictionary alloc]init];
Contacts *contact = [[Contacts alloc]init];
contactNumbers = [contact phoneNumbers];
for (NSDictionary* info in contactNumbers) {
firstLetter = [info objectForKey:#"lastName"];
index = #"_";
if([firstLetter length] > 0){
firstLetter =[firstLetter substringToIndex:1];
firstLetter= [firstLetter capitalizedString];
NSRange range = [string rangeOfString:firstLetter];
if(range.length >= 0){
index= firstLetter;
}
}
if(![letterArray objectForKey:index]){
[letterArray setValue:[NSMutableArray array] forKey:index];
}
[[letterArray objectForKey:index] addObject:info];
}
NSLog(#"%#",letterArray);}
and it NSLogs with this
C = (
{
firstName = Alex;
kind = Mobile;
lastName = Chang;
name = "Alex Chang (Mobile)";
number = "[phone]";
},
{
firstName = YuYu;
kind = Mobile;
lastName = Chen;
name = "YuYu Chen (Mobile)";
number = "[phone]";
},
{
firstName = Chris;
kind = Mobile;
lastName = Choi;
name = "Chris Choi (Mobile)";
number = "[phone]";
},
{
firstName = Kevin;
kind = Mobile;
lastName = Chung;
name = "Kevin Chung (Mobile)";
number = "1 [phone]";
}
);
H = (
{
firstName = Danny;
kind = Mobile;
lastName = Huang;
name = "Danny Huang (Mobile)";
number = "[phone]";
},
{
firstName = Ice;
kind = Mobile;
lastName = Huang;
name = "Ice Huang (Mobile)";
number = "[phone]";
}
);
K = (
{
firstName = Will;
kind = Mobile;
lastName = King;
name = "Will King (Mobile)";
number = "[phone]";
}
);
L = (
{
firstName = "";
kind = iPhone;
lastName = LastName;
name = " LastName (iPhone)";
number = "[phone]";
},
{
firstName = david;
kind = Mobile;
lastName = lub;
name = "david lub (Mobile)";
number = "[phone]";
}
);
for the -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView; method
how do i retrieve the number of sections for index;
and for the -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section; method, how do i retreive the number of rows in the section?
EDIT
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
NSArray *array = [letterArray mutableCopy];
return [[array objectAtIndex:section]count];}
and it gives me this error: -[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x8434cc0
Thank you in advance

Answer 1

for -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView you should do something like this:
return [letterArray count];
for -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section you should do something like this:
NSArray *array = letterArray;
return [[array objectAtIndex:section] count];
EDIT
Try this:
-(NSArray *)getLetterArrayCount {
NSMutableArray *countArray = [[NSMutableArray alloc] init];
NSNumber *subCount;
for (id key_main in letterArray) {
subCount = 0;
for (id key_sub in [letterArray objectForKey:key_main]) {
subCount = [NSNumber numberWithInt:[subCount intValue] + 1];
}
[countArray addObject:subCount];
}
return countArray;
}
You should call it once and save it to a class variable and call it like this for sections:
[countArray count];
And for the rows in a section like this:
[[countArray objectAtIndex:section] intValue];

Answer 2

letterArray = [[NSMutableDictionary alloc]init];
indexArray = [[NSMutableArray alloc] init];
[letterArray setValue:[NSMutableArray array] forKey:index];
[indexArray addObject:index];
for -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView :
return [letterArray count];
for -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section :
return [[letterArray objectForKey:[indexArray objectAtIndex:section]] count];
I think it will be helpful to you.

Answer 3

in ur question the letterarray is an NSDictionary. it wont show You the objectAtIndex option. try to change the NSMutableDictionary into NSMutableArray. then you will get the option.
and
return(letterarray.count)
NSMutableArray * arr = [[NSMutableArray alloc]init];
for (NSArray *ar in letterarray){
[arr addObject:ar];
}
Return this arr.count
i am Learning.,.,.