Question

I am a rookie in Xcode and I have been using the UITableViewController which shows this error.

This is the error message:
* Terminating app due to uncaught exception ‘NSRangeException’, reason: ‘* -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]’
* First throw call stack:
(0x1c91012 0x10cee7e 0x1c330b4 0x36d0 0xc58d5 0xc5b3d 0xacce83 0x1c50376 0x1c4fe06 0x1c37a82 0x1c36f44 0x1c36e1b 0x1beb7e3 0x1beb668 0x1665c 0x2132 0x2065)
libc++abi.dylib: terminate called throwing an exception
(lldb)

This is my code:

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


 if (indexPath.row == 0) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row0"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while ( objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
}

if (indexPath.row == 1) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row1"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while (objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
}

if (indexPath.row == 2) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row2"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while ( objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
}

if (indexPath.row == 3) {

    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/GetDetail.php?choice=row3"];
    NSArray *arrayImagesNames = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURL]];


    arrayDataFromServer2 = [[NSMutableArray alloc]init];

    NSEnumerator *enumForNames = [arrayImagesNames objectEnumerator];

    id objName;

    while ( objName = [enumForNames nextObject]) {
        [arrayDataFromServer2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:objName, @"name", nil]];
    }

    NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];

    row1 = [nn intValue];
    NSLog(@"%d", row1);

    CompanyProfileViewController *profile = [self.storyboard instantiateViewControllerWithIdentifier:@"Profile"];
    [self.navigationController pushViewController:profile animated:YES];

    profile.profileid = row1;
    NSLog(@"%d", profile.profileid);
 }
}

When I click on the second cell (index.row == 1) this error would occur.
I have used breakpoint and the error was on the line:
“NSString *nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@”name”];”

Please Help!

Answer 1

You have an array and you have either 0 or 1 elements in it. Now you are trying to extract 2nd element from it, [0] is first, and [1] is second.

EDIT:

As you are not sure when the array will contain 1 or more objects. Therefore you can use as:

NSString *nn=nil;
if([arrayDataFromServer2 count]>1){    
    nn = [[arrayDataFromServer2 objectAtIndex:indexPath.row] objectForKey:@"name"];
}