ios assigning value to a string from an array

Question

So I have a basic array:

NSMutableArray *answerButtonsArrayWithURL = [NSMutableArray arrayWithObjects:self.playView.coverURL1, self.playView.coverURL2, self.playView.coverURL3, self.playView.coverURL4, nil];

The objects inside are strings. I want to access a random object from that array

int rndValueForURLS = arc4random() % 3;

and assigning it a value. I've tried manny different approaches but my recent one is

[[answerButtonsArrayWithURL objectAtIndex:rndValueForURLS] stringByAppendingString:[self.coverFromRightAnswer objectAtIndex:self.rndValueForQuestions]];

Any help will be much appreciated. Thanks

matehat · Accepted Answer · 2013-06-09 19:49:57Z

1

You need to assign it. You're already building the new value like that:

NSString *oldValue = answerButtonsArrayWithURL[rndValueForURLS];
NSString *newValue = [oldValue stringByAppendingString:[self.coverFromRightAnswer objectAtIndex:self.rndValueForQuestions]];

The part you're missing :

answerButtonsArrayWithURL[rndValueForURLS] = newValue;

Above would be the way to replace the immutable string with another. If the strings are mutable, that is, they were created as NSMutableString, you could do:

NSMutableString *value = answerButtonsArrayWithURL[rndValueForURLS];
[value appendString:[self.coverFromRightAnswer objectAtIndex:self.rndValueForQuestions]];

Note:

Everywhere I replace the notation :

[answerButtonsArrayWithURL objectAtIndex:rndValueForURLS];

with the new equivalent and IMO more readable:

answerButtonsArrayWithURL[rndValueForURLS];

edited Jun 9, 2013 at 19:49

answered Jun 9, 2013 at 19:42

matehat

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1 Comment

alex Over a year ago

thanks a lot. the first solution didn't work but making them mutable, witch I should've done in the first place, worked.

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