Objective-C: 'unrecognized selector sent to instance'

Question

I want to set the value of an object for a certain key, but I get this strange error. I also tried to use setValue instead of setObject and the routenArray2 also got the key in it.

NSMutableArray *routenArray = [[NSMutableArray alloc] init];
NSMutableArray *routenArray2 = [[NSMutableArray alloc] init];

NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:
abfahrt,@"Abfahrt", ankunft, @"Ankunft", dauer, @"Dauer", route, @"Route", kennung, @"Kennung", nil];

[routenArray addObject:dict];

for (int j = 0; j < routenArray.count; j++) {

    NSNumber *lNumber = [indexArray objectAtIndex:j];
    int l = [lNumber intValue];

    if (l == i) {
          [routenArray2 addObject:[[routenArray objectAtIndex:j] copy]];
    }
}

NSString *kennungString = [NSString stringWithFormat:@"%d", k];

for (int i = 0; i < routenArray2.count; i++) {
      [[routenArray2 objectAtIndex:i] setObject:kennungString forKey:@"Kennung"]; //this line is the problem
}

What is the error you get more in detail - the log you get? why can I see a `k` but not the declaration ? — Clad Clad, Apr 15 '14 at 14:44
'NSInvalidArgumentException', reason: '-[__NSDictionaryI setObject:forKey:]: unrecognized selector sent to instance' thats the error. k is an integer — user3298017, Apr 15 '14 at 14:57
-1 for not including the *exact and complete* error message in the original question, and for not identifying the failing line. — Hot Licks, Apr 15 '14 at 15:30

score 2 · Accepted Answer · answered Apr 15 '14 at 14:58

2

Use

[routenArray2 addObject:[[routenArray objectAtIndex:j] mutableCopy]];

Instead of

[routenArray2 addObject:[[routenArray objectAtIndex:j] copy]];

copy returns NSDictionary, you need mutableCopy to return NSMutableDictionary.

answered Apr 15 '14 at 14:58

AlieN

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this works, thanks a lot you just finished my diploma project ;) – user3298017 Apr 15 '14 at 15:03
Glad to have helped, user3298017 – AlieN Apr 15 '14 at 15:03

score 0 · Answer 2 · answered Apr 15 '14 at 14:46

0

Try this:

NSMutableDictionary *newDict = (NSMutableDictionary *)[routenArray2 objectAtIndex:i];
[newDict setObject:kennungString forKey:@"Kennung"];

answered Apr 15 '14 at 14:46

Abdullah Shafique

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score 0 · Answer 3 · edited Apr 15 '14 at 15:17

0

Try typecasting in assign the value

[(NSMutableDictionary *)[routenArray2 objectAtIndex:i] setObject:kennungString forKey:@"Kennung"];

edited Apr 15 '14 at 15:17

Anbu.Karthik

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answered Apr 15 '14 at 14:51

NKB

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also the same error.. – user3298017 Apr 15 '14 at 14:57

Objective-C: 'unrecognized selector sent to instance'

3 Answers3