CODEWITHSUNDEEP
iosobjective-caudio
iOSBeginner
iOSBeginner

Reputation: 103

Whats is the easiest way to randomize sounds

I have 11 sounds for each soundpack. They are named:

My player initialises them with this code:

    NSString * strName = [NSString stringWithFormat:@"testpack%ld", (long) (value+1)];
    NSString * strPath = [[NSBundle mainBundle] pathForResource:strName ofType:@"mp3"];
    NSURL * urlPath = [NSURL fileURLWithPath:strPath];
    self.audioplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:urlPath error:NULL];

This sounds will be played by pressing buttons. For example, I have generated 4 buttons, this 4 buttons play every time only testpack1-4.mp3 but I want that my player takes random out of the 11 sounds. What's the easiest solution?

Note: I don't want to repeat the mp3 unless all are played

Upvotes: 2

Views: 56

Answers (2)

vadian
vadian

Reputation: 285160

A suggestion:

It declares 3 variables as static variables, played is a simple C-Array

static UInt32 numberOfSounds = 11;
static UInt32 counter = 0;
static UInt32 played[11];

The method playSound() resets the C-Array to zero values if the counter is 0 and sets the counter to the number of sounds. When the method is called the random generator creates an index number.

  • If the value at that index in the array is 0 the sound is played, the index in the array is set and the counter is decreased.

  • If the sound at that index has been played yet, loop until a non-used index is found.

    - (void)playSound
{
  if (counter == 0) {
    for (int i = 0; i < numberOfSounds; i++) {
      played[i] = 0;
    }
    counter = numberOfSounds;
  }
  BOOL found = NO;
  do {
    UInt32 value = arc4random_uniform(numberOfSounds) + 1;
    if (played[value - 1] != value) {
      NSString * strName = [NSString stringWithFormat:@"testpack1-%d", value];
      NSString * strPath = [[NSBundle mainBundle] pathForResource:strName ofType:@"mp3"];
      NSURL * urlPath = [NSURL fileURLWithPath:strPath];
      self.audioplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:urlPath error:NULL];
      played[value - 1] = value;
      counter--;
      found = YES;
    }
  } while (found == NO);
}

Upvotes: 2

Fahim Parkar
Fahim Parkar

Reputation: 31647

How about this?

int randNum = rand() % (11 - 1) + 1;

The formuale is like below

int randNum = rand() % (maxNumber - minNumber) + minNumber;

Upvotes: 2

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