Data Written to Plist is not saving - objective-c

Question

I made a few changes to the plist like inserting,deleting and reordering rows in a table.plist is changing to default on viewDidDisappear.
I tried the following code.
-(NSString *)dataFilePath{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dataFile = [documentsDirectory stringByAppendingPathComponent:#"ETCategoryList.plist"];
return dataFile;
}
//Code for deleting.
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if(editingStyle == UITableViewCellEditingStyleDelete){
[[self categoriesArray]removeObjectAtIndex:[indexPath row]];
NSArray *indexPathsToRemove = [NSArray arrayWithObject:indexPath];
[tableView deleteRowsAtIndexPaths:indexPathsToRemove withRowAnimation:UITableViewRowAnimationLeft];
[tableView reloadData];
NSArray *revisedArray = [[NSArray alloc]initWithArray:self.categoriesArray];
[revisedArray writeToFile:[self dataFilePath] atomically:YES];
}
}

Answer 1

Your code is :
NSArray *revisedArray = [[NSArray alloc]initWithArray:self.categoriesArray];
[revisedArray writeToFile:[self dataFilePath] atomically:YES];
which is correct!!!
The problem should be from self.categoriesArray, if the array contains some objects/ custom object then you can not write directly.
You need to archive it to NSData
NSData *objData = [NSKeyedArchiver archivedDataWithRootObject:object];
Or you can endcode it in your Custom Class.
- (void) encodeWithCoder:(NSCoder *)encoder {
[encoder encodeObject:obj1 forKey:#"key1"];
[encoder encodeFloat:obj2 forKey:#"key2"];
}
- (id)initWithCoder:(NSCoder *)decoder {
self = [super initWithCoder:coder];
obj1 = [coder decodeObjectForKey:#"key1"];
obj2 = [coder decodeObjectForKey:#"key2"];
return self;
}

Answer 2

your code is fine enough. its working well with me.
Sample code:
self.clickMeArray = [[NSMutableArray alloc] init];
for(int i =1; i<10;i++)
{
[self.clickMeArray addObject:[NSDictionary dictionaryWithObject:[NSString stringWithFormat:#"n%d",i] forKey:[NSString stringWithFormat:#"iN%d",i]]];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dataFile = [documentsDirectory stringByAppendingPathComponent:#"MyName.plist"];
[self.clickMeArray writeToFile:dataFile atomically:YES];
try to clean Build and Relaunch.

Answer 3

Try this
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *lefttBtn = [[UIBarButtonItem alloc] initWithTitle:#"Edit" style:UIBarButtonItemStylePlain
target:self action:#selector(EditTable:)];
[[self navigationItem] setLeftBarButtonItem:lefttBtn];
[lefttBtn release];
}
- (void) EditTable:(id)sender
{
if(self.editing)
{
[super setEditing:NO animated:NO];
[table setEditing:NO animated:NO];
[table reloadData];
[self.navigationItem.leftBarButtonItem setTitle:#"Edit"];
[self.navigationItem.leftBarButtonItem setStyle:UIBarButtonItemStylePlain];
}
else
{
[super setEditing:YES animated:YES];
[table setEditing:YES animated:YES];
[table reloadData];
[self.navigationItem.leftBarButtonItem setTitle:#"Done"];
[self.navigationItem.leftBarButtonItem setStyle:UIBarButtonItemStyleDone];
}
}
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if(editingStyle == UITableViewCellEditingStyleDelete){
[[self categoriesArray]removeObjectAtIndex:indexPath.row];
[[self categoriesArray] writeToFile:[self dataFilePath] atomically:YES];
[tableView reloadData];
}
}