Couldn't launch self.editing mode when press Edit button in TableView - ios

Question

I'm trying to create an editable table in iPhone App. I have two questions.
When I press the Edit button and thus enter the editing mode, I cannot delete a row.
If there's a way to add a "add new cell" function instead of the way I did in my code? (I added a addButtonAction method.)
Here's my .h
#import <UIKit/UIKit.h>
#interface FirstViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource>
{
UITableView *table;
NSMutableArray *tableDataSource;
}
-(IBAction)addButtonAction:(id)sender;
#end
Here's the .m
#import "FirstViewController.h"
#implementation FirstViewController
- (IBAction)addButtonAction:(id)sender
{
if(tableDataSource != nil)
{
[tableDataSource addObject:#"New City"];
}
[table reloadData];
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
tableDataSource = [[NSMutableArray alloc]init];
[tableDataSource addObjectsFromArray:[NSArray arrayWithObjects: #"Canada", #"United States", #"Australia", #"United Kingdom", nil]];
table = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 367) style:UITableViewStyleGrouped];
[table setDataSource:self];
[table setDelegate:self];
[self.view addSubview:table];
[[self navigationItem] setLeftBarButtonItem:[self editButtonItem]];
UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target:self
action:#selector(addButtonAction:)];
[[self navigationItem] setRightBarButtonItem:addButton];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[[self tableView] reloadData];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tableDataSource count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.textLabel.text = [tableDataSource objectAtIndex:indexPath.row];
return cell;
}
#pragma - Enable/Disable Edit Button
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
[super setEditing:editing
animated:animated];
[table setEditing:editing animated:animated];
}
#pragma - Editing Style
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert)
{
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
#pragma - Can Move Row
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
NSString *item = [tableDataSource objectAtIndex:fromIndexPath.row];
[tableDataSource removeObject:item];
[tableDataSource insertObject:item atIndex:toIndexPath.row];
}
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
#pragma mark - Table Title
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if(section == 0)
{
return #"City";
}
else
{
return #"Nothing here";
}
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
//TBD....
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
#end

Answer 1

Make sure when you delete row from tableView also to delete the object from NSArray.
This addButton I thik will work but this
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
make like this:
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
Just remove if statament...
Hope I understand your question ant this help.