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I have an NSMutableArray named randomSelection:

NSMutableArray *randomSelection;

I am then trying to add strings to this array if certain criteria are met:

[randomSelection addObject:@"string1"];

I am then trying to output the string, to determine if it has added it:

NSString *test = [randomSelection objectAtIndex:0];
NSLog(test);

However nothing is being output to the error log and I can't figure out why.

Any help/hints appreciated.

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Are you sure that the certain critera to add the string are met? Otherwise, maybe you should try NSLog(@"%@", test); – David Brunow Dec 12 '12 at 6:56
Yes the criteria is met. Just below NSLog(test) i have placed: NSLog("Made It!"); and that is being displayed. – SamBo Dec 12 '12 at 7:00
do i need to initialise the NSMutable array and alocate with ample space or something? I thought that was the point of this addObject function so that i dont have to do that. – SamBo Dec 12 '12 at 7:01
   
@David Brunow Please read question before putting any comments or ans.... this guy had not allocate "NSMutableArray *randomSelection;", so how he expect to get array object.... – Sunil Targe Dec 12 '12 at 7:24

5 Answers

up vote 2 down vote accepted

I think you are missing to allocate the memory for array. So try this

NSMutableArray *randomSelection = [[NSMutableArray alloc] init];
[randomSelection addObject:@"string1"];
NSString *test = [randomSelection objectAtIndex:0];
NSLog(test);
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1  
Your the best friend i never had. Worked perfectly thank you. – SamBo Dec 12 '12 at 7:06
@SamBo did indeed forget to allocate memory and initialize it. Right now the Array gets declared, but not defined. – ophychius Dec 12 '12 at 7:07
@SamBo You're welcome friend. We are here to help each other. I am happy that your problem got solved! Cheers. Dont forget to accept the answer.:P – hp iOS Coder Dec 12 '12 at 7:10
@SamBo Thanks for accepting the answer – hp iOS Coder Dec 12 '12 at 8:49
up vote 2 down vote

First allocate the array using following statement & then objects in it.

NSMutableArray *randomSelection =  [[NSMutableArray alloc] init];
[randomSelection addObject:[NSString stringWithFormat:@"String1"]];
[randomSelection addObject:[NSString stringWithFormat:@"String2"]];
NSLog(@"Array - %@", randomSelection);

This will definitely solves your problem.

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up vote 2 down vote

Just allocate your NSMutableArray. You'll get solved your problem.

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up vote 2 down vote 
NSMutableArray *randomSelection =  [[NSMutableArray alloc]init];
[randomSelection addObject:@"string1"];

You need to alloc it first.

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up vote 1 down vote

Try this: 

NSMutableArray *randomSelection = [[NSMutableArray alloc]init]; 
[randomSelection addObject:@"string1"];
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