Question

I have an array and every object of the array is with 2 objects:
double = time in miliseconds
nsstring = string to print

and i want that my app will scan the array and when it will come to the time of the miliseconds it will print the nsstring.

Answer 1

Alright, I assume the objects are called MyObject, and the array is called objectArray, so try this:

- (void)checkArrayForTimes; {
  float epsilon = 0.1;
  NSDate * currentTime = [NSDate date];
  float milliseconds = [currentTime timeIntervalSinceDate:startTime];
  milliseconds -= (int)milliseconds; // This mods out all of the seconds so you are only working with milliseconds.
  for(MyObject * myObject in objectArray){
    if(fabs(myObject.time - milliseconds) < epsilon){
      NSLog(@"%@", myObject.string);
    }
  }
}

In your .h file, add the line:

NSDate * startDate;

Then, in your viewDidLoad: method, add the lines:

    // Note, you can change the 0.05 to fit your needs.
    startDate = [[NSDate date] retain];
    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(checkArrayForTimes) userInfo:nil repeats:YES];

(Note:, you may need to use a NSDateFormatter to get an NSDate with 0 milliseconds.) Finally, in your dealloc method, add:

[startDate release];

Hope that Helps!