removeObjectForKey doesn't remove value from .plist - ios

Question

I am developing iPhone app in which i have TableView,
What i want to do is On click of UITableViewCell i want to remove this values from plist, MOBILES.Brand.2 and MOBILES.Brand.5 if they exist in .plist if they doesn't exist in .plist then i want to add it to my .plist
Here is the structure of my .plist:
:
Here is my code snippet:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
plistPath = [self getPlistPath];
//PlistDict is mutableDictionary contains the keys and values of .plist (of above image)
if ([PlistDict valueForKeyPath:#"MOBILES.Brand.2"] != nil) { //if key and it's value exists in Filter.plist
//Delete Key from .plist...
NSMutableDictionary *savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
[savedStock removeObjectForKey:#"MOBILES.Brand.2"];
[savedStock removeObjectForKey:#"MOBILES.Brand.5"];
[savedStock writeToFile:plistPath atomically:YES];
}else{
//Add Key to .plist
NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
[data setValue:#"251" forKeyPath:#"MOBILES.Brand.2"];
[data setValue:#"298" forKeyPath:#"MOBILES.Brand.5"];
[data writeToFile:plistPath atomically:YES];
}
}
-(NSString*)getPlistPath{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"Filter.plist"];
PlistDict = [NSMutableDictionary dictionaryWithContentsOfFile:path];
return path;
}
after writing above code snippet it doesn't remove the keys from .plist but it adds the key successfully if not existed.
Where i am doing mistake ? please help and thanks in advance.

Answer 1

The problem is you are trying to remove using the NSMutableDictionary keypath directly using removeObjectForKey that requires the exact key not keypath and you are supplying a keypath. Use the following NSMutableDictionary Category taken from here
#interface NSMutableDictionary (Additions)
- (void)removeObjectForKeyPath: (NSString *)keyPath;
#end
#implementation NSMutableDictionary (Additions)
- (void)removeObjectForKeyPath: (NSString *)keyPath
{
// Separate the key path
NSArray * keyPathElements = [keyPath componentsSeparatedByString:#"."];
// Drop the last element and rejoin the path
NSUInteger numElements = [keyPathElements count];
NSString * keyPathHead = [[keyPathElements subarrayWithRange:(NSRange){0, numElements - 1}] componentsJoinedByString:#"."];
// Get the mutable dictionary represented by the path minus that last element
NSMutableDictionary * tailContainer = [self valueForKeyPath:keyPathHead];
// Remove the object represented by the last element
[tailContainer removeObjectForKey:[keyPathElements lastObject]];
}
#end
It should work for you.
Method - 2
If the above doesn't work, you can do an iteration of your dictionary, and specifically delete the object for the key.. Try
NSMutableDictionary *savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
NSMutableDictionary *brand=[[savedStock objectForKey:#"MOBILES"] objectForKey:#"Brand"];
[brand removeObjectForKey:#"2"];
[brand removeObjectForKey:#"5"];
Cheers.