NSmutableArray Error Help

lmpeejay · May 2012

Hi there..
I am attempting to modif code from Jeff Lamarche's book for iphone development, Specifically the code to search and remove objects from an array, basically I am building a system to reduce the NSMutableArray by typing in a search term, however I keep getting the following error.

[__NSArrayI removeObjectsInArray:]: unrecognized selector sent to instance 0x6a30cd0

Below is the code. Can you please let me know what I am doing wrong? Thanks

P.J.
-----

- (void)handleSearchForTerm:(NSString *)searchTerm{
    
    NSMutableArray *sectionsToRemove;
    NSMutableArray *lclArray;
    NSMutableArray *toRemove;
    NSString *key;
    NSString *altSearchTerm;
    NSString *name;
    
    altSearchTerm = @\"the \";
    altSearchTerm = [altSearchTerm stringByAppendingString:searchTerm];
    
    sectionsToRemove = [[NSMutableArray alloc] init];
    [self resetSearch];
    
    for (key in self.listEditData) {
        
        lclArray = (NSMutableArray *)listData;
        toRemove = [[NSMutableArray alloc] init];
        
        for (name in lclArray) {
            
            if ([name rangeOfString:searchTerm 
                            options:NSCaseInsensitiveSearch].location != 0
                && [name rangeOfString:altSearchTerm 
                               options:NSCaseInsensitiveSearch].location != 0)
                [toRemove addObject:name];
        }
        
        if ([lclArray count] == [toRemove count]){
            [sectionsToRemove addObject:key];
        }
        
        [lclArray removeObjectsInArray:toRemove];
    }
    [self.listEditData removeObjectsInArray:sectionsToRemove];
    [myTableView reloadData];
}

baja_yu · May 2012

The error means that you are calling a method which does not exist for that object. More specifically, you're trying to remove objects from an immutable array.

What is self.listEditData declared as and where is it created or set?

lmpeejay · May 2012

It is defined in the .h file as an NSMutableArray. The thins is, I commented that line, and even the locally declared nsmutable array had the problem.

Any ideas?

PJ

baja_yu · May 2012

Where are you setting the value of that variable?

lmpeejay · May 2012

baja_yu;434571 said:
Where are you setting the value of that variable?

It is set in the viewDidLoad with an array, that is being displayed in the table successfully.

I used the list of dwarves lamarche added for testing.

baja_yu · May 2012

Post that code, or at least look at it. Your array is an NSArray for some reason.

lmpeejay · May 2012

baja_yu;434583 said:
Post that code, or at least look at it. Your array is an NSArray for some reason.

I think you might be right, I am going to rewrite the code, I have had some limited success. I will be back with my solution.

P.J.

baja_yu · May 2012

Just a quick note, if you're ever copying arrays keep in mind you have a 'copy' and a 'mutableCopy' method which work like this:

copy of an NSArray is an NSArray
mutableCopy of NSArray is an NSMutableArray

copy of an NSMutableArray is NSArray (!)
mutableCopy of an NSMutableArray is an NSMutableArray

One of those can trick you, so keep it that mind.

lmpeejay · May 2012

lmpeejay;434593 said:
I think you might be right, I am going to rewrite the code, I have had some limited success. I will be back with my solution.

P.J.

Here is the new code...it works with no fuss

- (void)handleSearchForTerm:(NSString *)searchTerm{
    
    // change toRemove to reducedArray
    
    NSMutableArray *lclArray;
    NSMutableArray *reducedArray;
    NSString *altSearchTerm;
    NSString *name;
    
    altSearchTerm = @\"the \";
    altSearchTerm = [altSearchTerm stringByAppendingString:searchTerm];
    
    [self resetSearch];
        
        lclArray = (NSMutableArray *)listData;
        reducedArray = [[NSMutableArray alloc] init];
        
        for (name in lclArray) {
            
            if ([name rangeOfString:searchTerm 
                            options:NSCaseInsensitiveSearch].location == 0
                || [name rangeOfString:altSearchTerm 
                               options:NSCaseInsensitiveSearch].location == 0)
                [reducedArray addObject:name];
        }


    self.listEditData = reducedArray;
    [myTableView reloadData];
}

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