Question

I am trying to create a scoring for my quiz app. The score is a label on my page and I use 3 different pages with a score label. One is the quiz then the correct page and the incorrect page. Initially, I set the value of the label to 0 on the quiz page. Then upon selection of the correct answer, it goes to the corresponding page and updates the score. So from 0 it becomes 1. Then it goes back to the question page with the label currently 1 and should update to 2 when the answer is correct again. My problem is, my label can’t seem to get updated. The score starts out as 0 then add 1 but after that, the score is stuck to 1. Here’s my code for it. I’m pretty sure, there’s a problem with the logic I’m using for it so I really appreciate all the help.

*Question Page

if(score.text == @"")
{
    int i = 0;
    strDefaultScore = [[NSString alloc] initWithFormat:@"%i", i];
    score.text = strDefaultScore;
}
else
{
    CorrectPage *update = [[CorrectPage alloc] init];
    strDefaultScore = update.updateScore;
    score.text = strDefaultScore;
}

Then here’s my code for the CorrectPage

QuestionPage *quiz = [[QuestionPage alloc]init];
int i = 1;
int j = [quiz.strDefaultScore intValue];
int sum = i + j;
updateScore = [[NSString alloc] initWithFormat:@"%i", sum];
currentScore.text = updateScore;

I’ve tried checking the value of strDefaultScore for both pages using NSLog and both return 0 which is why the score is 1 no matter how many correct answers I get. How do I correct this?

I have extremely little to none knowledge in using Objective-C and I’ve been searching the web for help with this but can’t find any so I honestly have no idea how to go about this.

Update:
I’ve managed to figure it out. I moved the code on the event(s) for the buttons so it looks something like this now.

-(IBAction)btn1 {
//Redirect to the next page
CorrectPage *correct = [[CorrectPage alloc]initWithNibName:@"CorrectPage" bundle[NSBundle mainBundle]]; 
[self.navigationController pushViewController: correct animated:YES];

//Update the value of score    
int newScore = [score.text integerValue];
int sum = newScore + 1;
updatedScore = [[NSString alloc]initWithFormat:@"%i", sum];
score.text = updatedScore;

//Pass the value of new score on the next page
[correct.currentScore setText: score.Text];
}

That worked for me but what I did was hardcoded so I had to put this on every button event. Also, since what I did is hard coded, I’m pretty much sure that there a better way of doing it.

Answer 1

Look closely at this code in the else condition:

CorrectPage *update;
strDefaultScore = update.updateScore;
score.text = strDefaultScore;

Your update object is not initialized, so it cannot respond to any messages. This would be better:

CorrectPage *update = [[CorrectPage alloc] init];

But you would need to set the updateScore value somehow.

Also, QuestionPage *quiz; has the same problem.