CODEWITHSUNDEEP
objective-c
S.J. Lim
S.J. Lim

Reputation: 3165

How to get specifying key's value array?

I'm trying to get array of just specifying key's value in following array obj.

Ex1) If specifying key "name",
    wanted result is : {"James", "Jhone", "Michael", "Donald", "Mac"}

Ex2) If specifying key "age",
    wanted result is : {25,27,35,25,26}

How to get?

Please help or advise.

NSArray *array = [[[NSArray alloc] initWithObjects:
        @{@"name" : @"James", @"age" : @25},
                @{@"name" : @"Jhone", @"age" : @27},
                @{@"name" : @"Michael", @"age" : @35},
                @{@"name" : @"Donald", @"age" : @25},
                @{@"name" : @"Mac", @"age" : @26},
                nil] autorelease];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"???  == name"];
NSArray *filtered = [array filteredArrayUsingPredicate:predicate];
NSLog(@"result : %@", filtered);

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"???  == age"];
NSArray *filtered = [array filteredArrayUsingPredicate:predicate];
NSLog(@"result : %@", filtered);

Upvotes: 2

Views: 4633

Answers (2)

Analog File
Analog File

Reputation: 5316

Just use KVC.

[array valueForKey:@"age"]

should give you an array of the ages.

Upvotes: 2

Carl Veazey
Carl Veazey

Reputation: 18363

Give this a try:

[array valueForKey:specifyingKey]

Hope this helps!

Upvotes: 11

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