Change a Property for All Objects in an NSMutableArray - objective-c

Question

I have an NSMutableArray with 9 objects. Those objects have many properties, like questionName, questionWhatRow, etc.
I want to be able to change one of those properties for All of the objects in the NSMutableArray.
Here is my NSMutableArray Class.
-(id) init
{
self = [super init];
if (self)
{
self.questionsArray = [[NSMutableArray alloc] init];
Question *newQuestion = [[Question alloc] init];
newQuestion.questionName = #"What is the name of the girl who has to fetch water for her family every day?";
newQuestion.questionRowName = #"Question 1";
newQuestion.questionAnswer = #"Nya";
newQuestion.questionHint = #"Maybe if you read the book you would know";
newQuestion.questionWhatRow = #"Nya";
newQuestion.questionCompleteOrNot = #"No";
newQuestion.pointForQuestion = 1;
[self.questionsArray addObject:newQuestion];
newQuestion = [[Question alloc] init];
newQuestion.questionName = #"What is Nya's sister's name?";
newQuestion.questionRowName = #"Question 2";
newQuestion.questionAnswer = #"Akeer";
newQuestion.questionHint = #"Maybe if you read the book you would know";
newQuestion.questionWhatRow = #"Nya";
newQuestion.questionCompleteOrNot = #"No";
newQuestion.pointForQuestion = 1;
[self.questionsArray addObject:newQuestion];
newQuestion = [[Question alloc] init];
newQuestion.questionName = #"What people is Nya's mother scared of when her father and sons go hunting?";
newQuestion.questionRowName = #"Question 3";
newQuestion.questionAnswer = #"Dinka";
newQuestion.questionHint = #"Maybe if you read the book you would know";
newQuestion.questionWhatRow = #"Nya";
newQuestion.questionCompleteOrNot = #"No";
newQuestion.pointForQuestion = 1;
[self.questionsArray addObject:newQuestion];
newQuestion = [[Question alloc] init];
newQuestion.questionName = #"What is Salva scared of when he is in the Akobo desert?";
newQuestion.questionRowName = #"Question 4";
newQuestion.questionAnswer = #"Lions";
newQuestion.questionHint = #"He is scared of an animal because it ate his friend Marial";
newQuestion = nil;
}
return self;
}
-(NSUInteger)count
{
return questionsArray.count;
}
- (Question *)questionAtIndex:(NSUInteger)index
{
return [questionsArray objectAtIndex:index];
}
Now, I have another class called ScoreViewController, and I want to be able to change the property, questionCompleteOrNot of the NSMutableArray questionsArray for all objects/questions to #"No".
My ScoreView has a button to Reset, but I don't know what to put in it to change all questionCompleteOrNot properties of the questionsArray to #"No".
Sorry for the long question, I was trying to be very specific.
Edit
Here is my DetailView for a tableView.
if ([[selectedQuestion questionCompleteOrNot] isEqualToString:#"No"])
{
if ([[selectedQuestion questionAnswer] caseInsensitiveCompare:answerField.text] == NSOrderedSame)
{
// Show the correct label
[correctLabel setHidden:NO];
correctLabel.text = #"Correct!";
correctLabel.textColor = [UIColor greenColor];
}
else
{
// Show the incorrect label
[correctLabel setHidden:NO];
correctLabel.text = #"Incorrect";
correctLabel.textColor = [UIColor redColor];
[incorrectPlayer play];
[[selectedQuestion questionCompleteOrNot] isEqualToString:#"Yes"];
}
// Erase the text in the answerField
answerField.text = #"";
}
if ([[selectedQuestion questionCompleteOrNot] isEqualToString:#"Yes"])
{
UIAlertView *error = [[UIAlertView alloc]
initWithTitle:#"Error"
message:#"You already answered this question. Please click the reset button on the score view to restart."
delegate:self
cancelButtonTitle:#"Okay!"
otherButtonTitles:nil];
[error show];
answerField.text = #"";
}
selectedQuestion.questionCompleteOrNot = #"Yes";
correctLabel.text = #"";
NSLog(#"Selected question's questionCompleteOrNot is %#", [selectedQuestion questionCompleteOrNot]);

Answer 1

You can use NSArray's makeObjectsPerformSelector:withObject:, like so:
[questionsArray makeObjectsPerformSelector:#selector(setQuestionCompleteOrNot:) withObject:#"No"];