How to insert an value into a NSMutableArray? [closed] - ios

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I know that my question sounds stupid, but it doesn't work with my code:
#import "TermineViewController.h"
#import "DetailViewController.h"
#interface TermineViewController ()
#end
#implementation TermineViewController {
NSArray *tableData;
int i;
NSString *userid;
NSString *selection;
NSMutableArray *userids;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSURL *url = [[NSURL alloc] initWithString: #"http://example.com"];
NSString *dataString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
tableData = [dataString componentsSeparatedByString:#"--"];
NSLog(userids);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return ([tableData count])/4;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.contentView.backgroundColor = [UIColor blackColor];
cell.accessoryView.backgroundColor = [UIColor blackColor];
[self.tableView setSeparatorColor:[UIColor whiteColor]];
self.view.backgroundColor = [UIColor blackColor];
//Declare all Labels
UILabel *name = (UILabel *)[cell viewWithTag:100];
UILabel *service = (UILabel *)[cell viewWithTag:200];
UILabel *time = (UILabel *)[cell viewWithTag:300];
//Write into Labels and add one to int i (declared in implementation)
name.text = [tableData objectAtIndex:i];
i++;
service.text = [tableData objectAtIndex:i];
i++;
time.text = [tableData objectAtIndex:i];
i++;
userid = [tableData objectAtIndex:i];
NSString *usrid = [NSString stringWithFormat:#"%#", userid];
[userids addObject:usrid];
i++;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
selection = userids[indexPath.row];
NSLog(#"User selected %#", selection);
NSLog(userids[0]);
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"details"]) {
DetailViewController *destViewController = (DetailViewController *)[segue destinationViewController];
destViewController.userid = selection;
}
}
#end
So, here are two issues: the first is that I don't get any values in my NSMutableArray (btw it is declared in the #implementation). The second is that I get following error message if the user scrolls in the TableView:
Terminating app due to uncaught exception 'NSRangeException', reason:
'* -[__NSArrayM objectAtIndex:]: index 20 beyond bounds [0 .. 19]'
* First throw call stack: [...]
I don't know whats the matter? Yes, in my Array are 20 values, but the 20th exists!
Thank you very much!!!!
Greetings, Kitzng

Answer 1

You're not creating the array anywhere, you have to do userids = [[NSMutableArray alloc] init] before you can use it.

Answer 2

In your code, i is not defined. My guess is that you mean indexPath.row or indexPath.section. If there are no values in your array, the issue may be that you haven't initialized it when you start adding the objects, and then call something like
tableData = [[NSMutableArray alloc] initWithCapacity:20]
but that's purely speculation based off of the details provided.
As far as the tableView scroll issue, if your array contains 20 objects, indexes [0...19] are the objects. If the table view, in numberOfRowsInSection: is returning something like tableData.count + 1, there will be not data at the index for the last row.