Objective C: splitting an array into subarrays

Question

I have a text file looking like this :

#AAA:x
12
34
7
...
#BBB:y
-74.7
-33.2
14
...
#CCC:z
32.4
17
...
#END

I'm able to put all of it in one big NSArray (using componentsSeparatedByString:@"\n")

Now I'd like to have:

AAA float NSArray with all the values under the tag #AAA:x;

BBB float NSArray with all the values under the tag #BBB:y; etc..

How can I do this?

Did you consider splitting at #, then splitting at \n and ignoring the first line? — DrummerB
– DrummerB, Commented Oct 26, 2012 at 14:35
i think this could actually works ! But how can I split an NSArray in 3NSArray based on a char value ('#' here) ? — IggY
– IggY, Commented Oct 26, 2012 at 14:43
Sorry but I don't understand your answer :s In apple documentation I only saw : "subarrayWithRange(NSRange arg0)" that sounds close to what I wanna do but it uses NSrange instead of NDString — IggY
– IggY, Commented Oct 26, 2012 at 14:47

DrummerB · Accepted Answer · 2012-10-26 15:45:50Z

3

To elaborate on my comment, try this:

NSMutableArray *subarrays = [[myTest componentsSeparatedByString:@"#"] mutableCopy];
for (int i = 0; i < subarray.length; i++) {
    NSArray *subarray = [subarrays[i] componentsSeparatedByString:@"\n"];
    subarray = [subarray subarrayWithRange:NSMakeRange(1, subarray.length-1)];
    subarrays[i] = subarray;
}

This should result in an array of string arrays.

So subarrays[0] will be an array of strings with these elements: 12, 34, 7. subarrays[1][2] will be a string "14"

If you want floats and not strings, you will have to additionally iterate over all the entries and convert them to float. You can use NSString's floatValue method to do that.

edited Oct 26, 2012 at 15:45

answered Oct 26, 2012 at 14:54

DrummerB

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2 Comments

IggY Over a year ago

Thenk you for your help. Few modifications to make on your example (if someone need them one day) NSMutableArray *subarrays = [[myTest componentsSeparatedByString:@"#"]mutablecopy]; and NSArray *subarray = [[subarrays objectAtIndex:i] componentsSeparatedByString:@"\n"];

DrummerB Over a year ago

I added your first suggestion to my post. The second one should work however as I suggested since Xcode 4.4.

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