How can I Shuffle my plist?

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• spencerharry80 Posts: 9New Users

  January 23

  I am also looking for solution, is there any particular code available for that?

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• Duncan C Posts: 8,031Tutorial Authors, Registered Users

  January 25

  scourgy said:

  Hello, friends. I am new here, so I will introduce myself. My name is Plamen and I am from Bulgaria. I need some help about my quiz application. I can't shuffle the questions and answers from my plist. Here's my code - I have 1 label (for the question) and 4 buttons (for the answers), please tell me how to shuffle the plist:

  THE .H FILE:
  
  #import
  
  
  @interface SecondViewController : UIViewController {
  int mainInt;
  IBOutlet UILabel *timer;
  NSTimer *randomMain;
  //that was for the timer
  int currentQuestion;
  }
  @property (retain, nonatomic) IBOutlet UILabel *timer; //this is for the timer
  @property (retain, nonatomic) IBOutlet UILabel *textQuestionTitle;
  @property (retain, nonatomic) IBOutlet UIButton *buttonA;
  @property (retain, nonatomic) IBOutlet UIButton *buttonB;
  @property (retain, nonatomic) IBOutlet UIButton *buttonC;
  @property (retain, nonatomic) IBOutlet UIButton *buttonD;
  @property (retain, nonatomic) NSArray *questions;
  @property (retain, nonatomic) NSString *answer;
  
  -(void)showNextQuestion;
  @end
  ================================================================
  
  THE .M FILE:
  
  #import "SecondViewController.h"
  
  @implementation SecondViewController
  @synthesize timer, buttonA, buttonB, buttonC, buttonD, textQuestionTitle;
  @synthesize questions = questions_;
  @synthesize answer = answer_;
  
  -(void)randomMainVoid {
  mainInt -= 1;
  timer.text = [NSString stringWithFormat:@"Time left: %d", mainInt];
  if (mainInt == 0) {
  [randomMain invalidate];
  randomMain = nil;
  }
  }
  
  
  - (void)viewDidLoad {
  [super viewDidLoad];
  mainInt = 11;
  randomMain = [NSTimer scheduledTimerWithTimeInterval:(1.0/1.0) target:self selector:@selector(randomMainVoid) userInfo:nil repeats:YES];
  NSString *path = [[NSBundle mainBundle] pathForResource:@"Questions" ofType:@"plist"];
  self.questions = [NSArray arrayWithContentsOfFile:path];
  currentQuestion = -1;
  [self showNextQuestion];
  }
  
  -(void)showNextQuestion {
  currentQuestion ++;
  if (currentQuestion < [self.questions count]) {
  NSDictionary *nextQuestion = [self.questions objectAtIndex:currentQuestion];
  self.answer = [nextQuestion objectForKey:@"QuestionAnswer"];
  self.textQuestionTitle = [nextQuestion objectForKey:@"QuestionTitle"];
  NSString *varA = [nextQuestion objectForKey:@"A"];
  [buttonA setTitle: varA forState:UIControlStateNormal];
  NSString *varB = [nextQuestion objectForKey:@"B"];
  [buttonB setTitle: varB forState:UIControlStateNormal];
  NSString *varC = [nextQuestion objectForKey:@"C"];
  [buttonC setTitle: varC forState:UIControlStateNormal];
  NSString *varD = [nextQuestion objectForKey:@"D"];
  [buttonD setTitle: varD forState:UIControlStateNormal];
  }
  }
  
  - (void)didReceiveMemoryWarning {
  // Releases the view if it doesn't have a superview.
  [super didReceiveMemoryWarning];
  // Release any cached data, images, etc that aren't in use.
  }
  
  - (void)viewDidUnload {
  [super viewDidUnload];
  // Release any retained subviews of the main view.
  // e.g. self.myOutlet = nil;
  }
  - (void)dealloc {
  [super dealloc];
  }
  
  @end
  

  Here's my plist:
  
  
  P.S: Sorry for my bad english.

  Instead of having 1 property questions, create an NSArray property allQuestions and an NSMutableArray property remainingQuestions:

  @property (retain, nonatomic) NSArray *allQuestions;
  @property (retain, nonatomic) NSMutableArray *remainingQuestions;
  

  
  Change this line:
  

  self.allQuestions = [NSArray arrayWithContentsOfFile:path];
  

  Then to populate your list of remaining questions:

  self.remainingQuestions = [[self.allQuestions mutableCopy] autorelease];
  

  And to fetch a question:
  
  if (remainingQuestions.count == 0)

  self.remainingQuestions = [[self.allQuestions mutableCopy] autorelease];
  
  NSInteger index = arc4random_uniform([self.remainingQuestions count]);
  NSDictionary *nextQuestion = [remainingQuestions objectAtIndex: index];
  [remainingQuestions removeObjectAtIndex: index];
  

  The code above fetches questions in random order, removes each question from the list of current questions once it's been fetched, and then repopulates the array after all the questions have been fetched.
  
  Disclaimer: I typed this code into a browser window have not compiled it, much less tested it. It is perfectly likely to contain a few syntax errors, and may even contain minor bugs.

  Post edited by Duncan C on January 25

  Regards,
  
  Duncan C
  WareTo
  
  
  
  Animated GIF created with Face Dancer, available for free in the app store.
  

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