Tableview is not showing? - ios

Question

I am making tableview with different sections programmatically. I am using this code Please help me where i am wrong.
I have to show different sections with different cells ,sections of years and cells of movies.
in .h file
{
NSDictionary *movieTitles;
NSArray *years;
}
#property (nonatomic, retain) NSDictionary *movieTitles;
#property (nonatomic, retain) NSArray *years;
in .m file
#synthesize movieTitles;
#synthesize years;
- (void)viewDidLoad {
[super viewDidLoad];
NSString *path = [[NSBundle mainBundle]pathForResource:#"about" ofType:#"plist"];
NSDictionary *dic = [[NSDictionary alloc]initWithContentsOfFile:path];
movieTitles = dic;
aboutTable = [[UITableView alloc]initWithFrame:CGRectMake(20, 50, self.view.frame.size.width - 40, self.view.frame.size.height) style:UITableViewStyleGrouped];
aboutTable.delegate = self;
aboutTable.dataSource = self;
UIButton *backButton = [[UIButton alloc]initWithFrame:CGRectMake(20, 20, 50, 20)];
[backButton addTarget:self action:#selector(backdb) forControlEvents:UIControlEventTouchUpInside];
[backButton setTitle:#"Back" forState:UIControlStateNormal];
[self.view addSubview:backButton];
[self.view addSubview:aboutTable];
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [years count];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSString *details = [years objectAtIndex:section];
NSArray *titleSection = [movieTitles objectForKey:details];
return [titleSection count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *cellidentifier = #"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellidentifier ];
if(!cell)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellidentifier];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
NSString *details = [years objectAtIndex:[indexPath section]];
NSArray *titleSection = [movieTitles objectForKey:details];
cell.textLabel.text = [titleSection objectAtIndex:[indexPath row]];
return cell;
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
NSString *details = [years objectAtIndex:section];
return details;
}

Answer 1

You are returning the [years count] for numberOfSectionsInTableView. Where you initialise the years?
And also in viewDidLoad, instead of movieTitles = dic, use the below code:-
movieTitles = [dic copy];

Answer 2

where is your "year" value. It count become Zero. and you have to alloc your value.so first of all add object to array.
e.g.years =[[NSArray alloc]initWithObjects:#"2001",#"2002",#"2003", nil];

Answer 3

Table view don't show beacuse "years is nil" when called
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [years count];
}
as the number of section return 0, so the tableveiw could not add.
resolve this issue.
add this line in viewDidLoad method
years = #[#"2015",#"2015"];

Answer 4

- (void)viewDidLoad {
NSArray *arrYear;
arrYear=[[NSArray alloc]initWithObjects:#"1991",
#"1992",
#"1993",
#"1994",nil]
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *cellIdetifier = [NSString stringWithFormat:#"Cell_%#",indexPath];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdetifier ];
if(!cell)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdetifier];
cell.textLabel.text = [arrYear objectAtIndex:[indexPath row]];
}
return cell;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return years.count;
}

Answer 5

arrYear=[[NSArray alloc]initWithObjects:#"1991",
#"abc",
#"xyz",
#"123",nil]
You have to initialise Your Array values in didload