i have a NSMutableArray. In this is the structure of my Array:
{
Distance = 0;
Name = Name1;
Town = Town1;
}
{
Distance = 0;
Name = Name2;
Town = Town2;
}
And now I want to replace "Distance". For example that "Distance = 15".
How can I do this?
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1 Answer
OK, let's say your initial NSMutableArray is called initial (given that it contains NSMutableDictionary objects...
To alter the first element's distance value :
[[initial objectAtIndex:0] setValue:[NSNumber numberWithInt:15]
forKey:@"Distance"];
IF you want to perform the correction for every entry in the array, just do it this way :
for (NSMutableDictionary* entry in initial)
{
[entry setValue:[NSNumber numberWithInt:15]
forKey:@"Distance"];
}
10 Comments
theandrew
2013-02-13 08:54:42.591 Heurigen-App[555:11c03] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object' *** First throw call stack: (0x1848012 0x1178e7e 0x1847deb 0x180e347 0xb919bf 0x6226 0x17af4b 0x17b01f 0x16380b 0x17419b 0x11092d 0x118c6b0 0x2fbefc0 0x2fb333c 0x2fb3150 0x2f310bc 0x2f32227 0x2f328e2 0x1810afe 0x1810a3d 0x17ee7c2 0x17edf44 0x17ede1b 0x17a27e3 0x17a2668 0xc065c 0x26bd 0x25e5) libc++abi.dylib: terminate called throwing an exception (lldb)
Dr.Kameleon
@theandrew The error message is pretty self-explanatory, isn't it? As I've already mentioned, the array has to contain instances of
NSMutableDictionary. If they're just NSDictionary instances (= IMmutable), how could they be altered?Dr.Kameleon
@theandrew Could you post the code with which you create your initial array?
theandrew
news = [NSJSONSerialization JSONObjectWithData:data options:nil error:nil];
Dr.Kameleon
@theandrew Try this :
news = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:NULL];. It should work. |