Objective-C: how to init NSMutableDictionary with Array?

Question

I have an Array, which consists of object,key,object,key,object,key.

How to init NSMutableDictionary with this array?

I found methods for separated arrays of keys(ArrayOfKeys) and objects(ArrayOfObjects), but not for this mixed Array.

also ObjectsAndKeys maybe help, but i don't know how.

Thanks for help!

fengd · Accepted Answer · 2012-06-06 09:39:56Z

4

NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
for(int i=0; i < [array length] - 1; i += 2)
{
    [dictionary setObject:[array objectAtIndex:i+1] forKey:[array objectAtIndex: i]];
}

answered Jun 6, 2012 at 9:39

fengd

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1 Comment

fbernardo Over a year ago

@loldop Have a look at this blog post: cocoawithlove.com/2008/08/nsarray-or-nsset-nsdictionary-or.html

fbernardo · Accepted Answer · 2012-06-06 09:34:22Z

2

Just create two arrays: keysArray (odd indexes) and valuesArray (even indexes) and use [NSMutableDictionary dictionaryWithObjects:valuesArray forKeys:keysArray]

You can do this with a single for loop...

answered Jun 6, 2012 at 9:34

fbernardo

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10 Comments

gaussblurinc Over a year ago

i know, but i want to avoid tricks like this. I think, that Apple libraries are more flexible, oh

ThomasW Over a year ago

@loldop In this particular case there is no initializer that does what you want. You'll need to do it yourself.

fengd Over a year ago

Flexibility doesn't mean giving anything you want

gaussblurinc Over a year ago

@Jun1st it is strange, that i have method ObjectsAndKeys and doesn't have method ObjectsAndKeysFromOneArray. i want this method, cause it simple to realization and simple to read.

fengd Over a year ago

@loldop, it's definitely simple. but it takes time to do a thing, no matter how simple it is. Frameworks are built by developers, and developers are lazy:)

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