CODEWITHSUNDEEP
iphoneobjective-ciostableview
Jakub
Jakub

Reputation: 13860

NSIndexPath to UITableView from other class

I'm a little confused how to use IndexPath to add row into TableView. In first i init:

    tableView = [[UITableView alloc] initWithFrame:self.view.bounds]; 

    //rows code here

    [self.view addSubview:tableView];

Now between this two i would like to add some row to my table View. I have an NSArray with NSStrings contains elements name.

So i try this:

[[self tableView] beginUpdates];
[[self tableView] insertRowsAtIndexPaths:(NSArray *)myNames withRowAnimation:UITableViewRowAnimationNone];
[[self tableView] endUpdates];

Then I've read that I should first add this somehow to UITableViewDataSource. So i declared it wrong? I'm asking becouse i'd rather avoid unnecessary passing data.

Upvotes: 0

Views: 225

Answers (2)

danh
danh

Reputation: 62676

The idea of the table view - and most views in MVC - is that they reflect the state of the model. So, yes, as you suggested, have your datasource maintain an array:

@property (strong, nonatomic) NSMutableArray *array;

Make changes to the array:

[self.array addObject:@"New Object"];

Record what rows have changed...

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[self.array count]-1 inSection:0];
NSArray *myNames = [NSArray arrayWithObject:indexPath];

Then let the table view know that the model is different using the code you posted...

[[self tableView] beginUpdates];
[[self tableView] insertRowsAtIndexPaths:myNames withRowAnimation:UITableViewRowAnimationNone];
[[self tableView] endUpdates];

Upvotes: 1

emu
emu

Reputation: 36

AFAIK that's not a very good way to add data to a UITableView. I misunderstood what you were trying to do, in either case you need to setup your tableview's datasource like this:

tableView = [[UITableView alloc] initWithFrame:self.view.bounds]; 

[tableView setDataSource:self];

[self.view addSubview:tableView];

Then you need to implement the UITableViewDataSource protocol (and probably UITableViewDelegate). You will want to implement the following datasource methods:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [myNames count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell = [[[UITableViewCell alloc] initWithCellStyleDefault reuseIdentifier@"MyIdentifier"] autorelease];
    [[cell textLabel] setText:[myNames objectAtIndex:[indexPath row]]];
    return cell;
}

You might want to read up on the Reuse Identifier, it's necessary to ensure that your tables scroll smoothly and don't take up too much memory.

Upvotes: 1

Related Questions