Geek asks and answers

Delete object from NSMutableArray?

I have an array with the following elements in a method ViewDidLoad

inputArray = [NSMutableArray arrayWithObjects:@"car", @"bus", @"helicopter", @"cruiz", @"bike", @"jeep", nil];

I have another one UITextFieldto search for items. Since I find something in UITextField, I want to check if this string is present in "inputArray" or not. If it does not match the elements in inputArray, then remove the corresponding elements from inputArray.

 for (NSString* item in inputArray)
   {
        if ([item rangeOfString:s].location == NSNotFound) 
        {
            [inputArray removeObjectIdenticalTo:item];//--> Shows Exception
            NSLog(@"Contains :%@",containsAnother);
        }

  }

but this code shows an exception, something related to "removeobject:"

An exception:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSCFConstantString rangeOfString:options:range:locale:]: nil argument'
*** First throw call stack:
`
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8 answers

You can use the following code

for (int i=0;i<[inputArray count]; i++) {
        NSString *item = [inputArray objectAtIndex:i];
        if ([item rangeOfString:s].location == NSNotFound) {
            [inputArray removeObject:item];
            i--;
        }
    }
+10
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In a quick listing, you can NOT change the collection.

.

:

NSMutableArray *inputArray = [NSMutableArray arrayWithObjects:@"car", @"bus", @"helicopter", @"cruiz", @"bike", @"jeep", nil];
NSString *s=@"bus";

for (int i=inputArray.count-1; i>-1; i--) {
    NSString *item = [inputArray objectAtIndex:i];
    if ([item rangeOfString:s].location == NSNotFound) {
        [inputArray removeObject:item];
    }
}

EDIT:

:

NSArray *array=[inputArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@",s]];
+10

NSMutableArray. NSArray ( ).

:

inputArray = [NSArray arrayWithObjects:@"car", @"bus", @"helicopter", @"cruiz", @"bike", @"jeep", nil];

:

inputArray = [NSMutableArray arrayWithObjects:@"car", @"bus", @"helicopter", @"cruiz", @"bike", @"jeep", nil];

NSMutableArray:

@property(nonatomic, strong) NSMutableArray *inputArray;
0

s , , . , . , .

0

, . NSArray map. NSArray , :

@interface NSArray (BlockExtensions)
/*! 
 Invokes block once for each element of self, returning a new array containing the
 values returned by the block.
 */
- (NSArray *)map:(id (^)(id obj))block;

@end

@implementation NSArray (BlockExtensions)

- (NSArray *)map:(id (^)(id obj))block
{
    return [self mapWithOptions:0 usingBlock:^id(id obj, NSUInteger idx) {
        return block(obj);
    }];
} 

- (NSArray *)mapWithOptions:(NSEnumerationOptions)options usingBlock:(id (^)(id obj, NSUInteger idx))block
{
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:[self count]];
    [self enumerateObjectsWithOptions:options usingBlock:^(id obj, NSUInteger idx, BOOL *stop)     {

        id newobj = block? block(obj, idx) : obj;
        if (newobj)
            [array addObject:newobj];
    }];
    return array;
}
    @end

, :

NSArray *newArray = [inputArray map:^id(NSString *item) {
    if ([item rangeOfString:s].location == NSNotFound) {
        return item;
    }
    return nil;
}];

newArray !

0

. ( / UITextField)

NSMutableArray ViewDidLoad, ,

self.listOfTemArray = [[NSMutableArray alloc] init]; // array no - 1
self.ItemOfMainArray = [[NSMutableArray alloc] initWithObjects:@"YorArrayList", nil]; // array no - 2 

[self.listOfTemArray addObjectsFromArray:self.ItemOfMainArray]; // add 2array to 1 array

. UISearchBar

- (BOOL) textFieldDidChange:(UITextField *)textField
 {
        NSString *name = @"";
        NSString *firstLetter = @"";

    if (self.listOfTemArray.count > 0)
         [self.listOfTemArray removeAllObjects];

        if ([searchText length] > 0)
        {
                for (int i = 0; i < [self.ItemOfMainArray count] ; i = i+1)
                {
                        name = [self.ItemOfMainArray objectAtIndex:i];

                        if (name.length >= searchText.length)
                        {
                                firstLetter = [name substringWithRange:NSMakeRange(0, [searchText length])];
                                //NSLog(@"%@",firstLetter);

                                if( [firstLetter caseInsensitiveCompare:searchText] == NSOrderedSame )
                                {
                                    // strings are equal except for possibly case
                                    [self.listOfTemArray addObject: [self.ItemOfMainArray objectAtIndex:i]];
                                    NSLog(@"=========> %@",self.listOfTemArray);
                                }
                         }
                 }
         }
         else
         {
             [self.listOfTemArray addObjectsFromArray:self.ItemOfMainArray ];
         }

        [self.tblView reloadData];
}

}

Console.

0

, . , , - .

for (NSString* item in [inputArray copy]) {
   ...
}
0

+1 Anoop, , filteredArrayUsingPredicate. , inputArray, - :

NSArray *matchingArray = [inputArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF contains[c] %@", s]];

Alternatively, given what it inputArrayis NSMutableArray, you can simply filter the array using this separate line:

[inputArray filterUsingPredicate:[NSPredicate predicateWithFormat:@"SELF contains[c] %@", s]];

Or if you like blocks:

[inputArray filterUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
    return ([evaluatedObject rangeOfString:s].location != NSNotFound);
}]];
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