Question

How to create key value dictionary in Objective-C

Answer 1

#import <Foundation/Foundation.h>

int main (int argc, const char *argv[]) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
                            [NSNumber numberWithInt:6], @"c",
                            [NSNumber numberWithInt:5], @"objective c",
                            [NSNumber numberWithInt:3], @"c++",
                            [NSNumber numberWithInt:9], @"python",
                            [NSNumber numberWithInt:2], @"java", nil];

    NSLog(@"keys:");
    for (id key in dict) {
        NSLog(key);
    }

    NSLog(@"\nvalues:");
    for (id value in [dict objectEnumerator]) {
        NSLog(@"%@", value);
    }

    [pool drain];

    return 0;
}




/*
run:

keys:
python
objective c
java
c
c++

values:
9
5
2
6
3

*/

 

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Answer 2

#import <Foundation/Foundation.h>

int main (int argc, const char *argv[]) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
                            [NSNumber numberWithInt:6], @"c",
                            [NSNumber numberWithInt:5], @"objective c",
                            [NSNumber numberWithInt:3], @"c++",
                            [NSNumber numberWithInt:9], @"python",
                            [NSNumber numberWithInt:2], @"java", nil];


    NSEnumerator *enm = [dict keyEnumerator];

    id key;
    NSLog(@"keys:");
    while ((key = [enm nextObject])) {
        NSLog(key);
    }


    enm = [dict objectEnumerator];
    id value;
    NSLog(@"\nvalues:");
    while ((value = [enm nextObject])) {
        NSLog(@"%@", value);
    }

    [pool drain];
    
    return 0;
}




/*
run:

keys:
python
objective c
java
c
c++

values:
9
5
2
6
3

*/

 

Learn & Practice Python
with the most comprehensive set of 13 hands-on online Python courses
Start now