Convert id type to int [duplicate] - ios

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Get int value from NSMutableOrderedSet
(1 answer)
Closed 8 years ago.
I guess it's really simple, but I can't find the way to work this out...
#property (strong, nonatomic) NSMutableArray *randomQuestionNumberArray;
I have a method beginning like this
- (int)showQuestionMethod:(int)number;
In this method I have a loop where I fill NSMutableArray with numbers and then shuffle it.
//Creating random questions array
_randomQuestionNumberArray = [[NSMutableArray alloc] init];
for (int i = 0; i < numberOfQuestions; i++) {
[_randomQuestionNumberArray addObject:[NSNumber numberWithInt:i]];
}
//Shuffling the array
NSUInteger count = [_randomQuestionNumberArray count];
for (NSUInteger i = 0; i < count; ++i) {
// Select a random element between i and end of array to swap with.
int nElements = count - i;
int n = (arc4random() % nElements) + i;
[_randomQuestionNumberArray exchangeObjectAtIndex:i withObjectAtIndex:n];
}
And this works pretty well. Let's say it shuffles the numbers like 4, 5, 1, 3, 6, 0, 2.
Now in viewDidLoad I try to call the the method showQuestionMethod with the first value of _randomQuestionNumberArray which should be 4 in this case.
[self showQuestionMethod:[_randomQuestionNumberArray[0] intValue]];
The problem is that the method gets passed the value of 0 all the time when it should be 4, but NSLog(#"first value is %#", _randomQuestionNumberArray[0]) returns the correct value of 4.
How do I get around this and convert id type to int?

Answer 1

You can try this:
[self showQuestionMethod:[(NSNumber)_randomQuestionNumberArray[0] intValue]];

Answer 2

Are you sure, that the wrong value is passed? Maybe you have a problem with your NSLog statement in your showQuestionMethod.
I've tried this code and it works fine:
- (IBAction)start:(id)sender {
NSMutableArray *_randomQuestionNumberArray;
int numberOfQuestions=5;
_randomQuestionNumberArray = [[NSMutableArray alloc] init];
for (int i = 0; i < numberOfQuestions; i++) {
[_randomQuestionNumberArray addObject:[NSNumber numberWithInt:i]];
}
//shuffling the array
NSUInteger count = [_randomQuestionNumberArray count];
for (NSUInteger i = 0; i < count; ++i) {
// Select a random element between i and end of array to swap with.
int nElements = count - i;
int n = (arc4random() % nElements) + i;
[_randomQuestionNumberArray exchangeObjectAtIndex:i withObjectAtIndex:n];
}
NSLog(#"first value is %#", _randomQuestionNumberArray[0]);
[self showQuestionMethod:[_randomQuestionNumberArray[0] intValue]];
}
- (void)showQuestionMethod:(int)number {
NSLog(#"number is %d", number);
}