CODEWITHSUNDEEP
iphoneobjective-ccocoa-touchnsarraynsdictionary
davis
davis

Reputation: 1951

Convert NSMutableArray to NSDictionary in order to use objectForKey?

I have an NSMutableArray that looks like this

 {
    "@active" = false;
    "@name" = NAME1;
 },
 {
    "@active" = false;
    "@name" = NAME2;
 }

Is there a way to convert this to an NSDictionary and then use objectForKey to get an array of the name objects? How else can I get these objects?

Upvotes: 3

Views: 21939

Answers (6)

NoobMe
NoobMe

Reputation: 544

yes you can

see this example:

NSDictionary *responseDictionary = [[request responseString] JSONValue];
NSMutableArray *dict = [responseDictionary objectForKey:@"data"];
NSDictionary *entry = [dict objectAtIndex:0];
NSString *num = [entry objectForKey:@"num"]; 
NSString *name = [entry objectForKey:@"name"];
NSString *score = [entry objectForKey:@"score"];

im sorry if i can't elaborate much because i am also working on something

but i hope that can help you. :)

Upvotes: 1

damith
damith

Reputation: 33

This is example one of the exmple get the emplyee list NSMutableArray and create NSMutableDictionary.......

NSMutableArray *emloyees = [[NSMutableArray alloc]initWithObjects:@"saman",@"Ruchira",@"Rukshan",@"ishan",@"Harsha",@"Ghihan",@"Lakmali",@"Dasuni", nil];

NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSString *word in emloyees) {
    NSString *firstLetter = [[word substringToIndex:1] uppercaseString];
    letterList  = [dict objectForKey:firstLetter];

    if (!letterList) {
        letterList = [NSMutableArray array];
        [dict setObject:letterList forKey:firstLetter];
    }
    [letterList addObject:word];
}   NSLog(@"dic %@",dict);

Upvotes: 1

vikingosegundo
vikingosegundo

Reputation: 52237

There is a even shorter form then this proposed by Hubert

NSArray *allNames = [array valueForKey:@"name"];

valueForKey: on NSArray returns a new array by sending valueForKey:givenKey to all it elements.

From the docs:

valueForKey:
Returns an array containing the results of invoking valueForKey: using key on each of the array's objects.

- (id)valueForKey:(NSString *)key

Parameters
key The key to retrieve.

Return Value
The value of the retrieved key.

Discussion
The returned array contains NSNull elements for each object that returns nil.

Example:

NSArray *array = @[@{ @"active": @NO,@"name": @"Alice"},
                   @{ @"active": @NO,@"name": @"Bob"}];

NSLog(@"%@\n%@", array, [array valueForKey:@"name"]);

result:

(
        {
        active = 0;
        name = Alice;
    },
        {
        active = 0;
        name = Bob;
    }
)
(
    Alice,
    Bob
)

Upvotes: 7

Nguyen Thanh Hung
Nguyen Thanh Hung

Reputation: 274

If you want to convert NSMutableArray to corresponding NSDictionary, just simply use mutableCopy

NSMutableArray *phone_list; //your Array
NSDictionary *dictionary = [[NSDictionary alloc] init];
dictionary = [phone_list mutableCopy];

Upvotes: 4

Orbitus007
Orbitus007

Reputation: 696

No, guys.... the problem is that you are stepping on the KeyValue Mechanism in cocoa.

KeyValueCoding specifies that the @count symbol can be used in a keyPath....

myArray.@count

SOOOOOO.... just switch to the ObjectForKey and your ok!

NSMutableDictionary *myDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"theValue", @"@name", nil];

id kvoReturnedObject = [myDictionary valueForKey:@"@name"]; //WON'T WORK, the @ symbol is special in the valueForKey
id dictionaryReturnedObject = [myDictionary objectForKey:@"@name"];

NSLog(@"object = %@", dictionaryReturnedObject);

Upvotes: 0

Hubert Kunnemeyer
Hubert Kunnemeyer

Reputation: 2261

This is an Array of Dictionary objects, so to get the values you would:

[[myArray objectAtIndex:0]valueForKey:@"name"]; //Replace index with the index you want and/or the key.

Upvotes: 3

Related Questions