Issue in adding dynamic cell in table view? - iphone

Question

Please have a look on my code which i am using to add dynamic cells in my table view add run time. At did select of my table view i have called this method.
- (void) allServersFound
{
// called from delegate when bonjourservices has listings of machines:
NSArray *newPosts = [[NSArray alloc]initWithObjects:#"A", nil]; // NSArray of machine names;
NSMutableArray *tempArray = [[NSMutableArray alloc] initWithObjects: #"A",#"B",#"C",#"D", nil];
int i = 0;
for (NSArray *count in newPosts)
{
[tempArray addObject:[NSIndexPath indexPathForRow:i++ inSection:0]];
}
[[self tblHome] beginUpdates];
[[self tblHome] insertRowsAtIndexPaths:tempArray withRowAnimation:UITableViewRowAnimationNone];
[[self tblHome] endUpdates];
[tempArray release];
}
But this give me following Exception at run time:
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSIndexPath _fastCStringContents:]: unrecognized selector sent to instance 0x4e0e130

Answer 1

First you initialize your tempArray with strings like this:
NSMutableArray *tempArray = [[NSMutableArray alloc] initWithObjects: #"A",#"B",#"C",#"D", nil];
Then you add indexPaths like this:
[tempArray addObject:[NSIndexPath indexPathForRow:i++ inSection:0]];
so the array you pass to the insertRowsAtIndexPaths method contains both strings and indexPaths objects. I think this is the reason of the exception.

Answer 2

As others noted, your tempArray contains a mixture of NSString and NSIndexPath objects. This is the most obvious thing that you need to address before you do anything else. You can use [NSMutableArray array] class method for that (it's autoreleased, so you'll need to remove the call to [tempArray release] at the end of your method).
A less obvious thing is that the model of your UITableView must be updated before you call insertRowsAtIndexPaths, otherwise you would get another exception in a much less obvious place.

Answer 3

Your tmparray contains NSString values as well as the IndexPaths, try removing the NSStrings first.
Try replacing the line
NSMutableArray *tempArray = [[NSMutableArray alloc] initWithObjects: #"A",#"B",#"C",#"D", nil];
with the line
NSMutableArray *tempArray = [[NSMutableArray alloc] initWithObjects:nil];