Question

I’m creating this app that converts text to Morse code and then flash it out using the iPhone’s flashlight. I have used string replacement to convert the content of a NSString to Morse code. I have found a script that turns the iPhone’s flashlight on and off, with adjustable intervals using NSTimer. But I can’t figure out how to add two different intervals, one for the morse “.” and one for the morse “-“. Can anyone help me?

- (void)viewDidLoad {
[super viewDidLoad];

int spaceTime;
    spaceTime = 1;

int flashTimePrik;
    flashTimePrik = 5;

strobeIsOn = NO;
strobeActivated = NO;
strobeFlashOn = NO;

flashController = [[FlashController alloc] init];

self.strobeTimer =          [
                            NSTimer 
                            scheduledTimerWithTimeInterval:spaceTime
                            target:self 
                            selector:@selector(strobeTimerCallback:) 
                            userInfo:nil 
                            repeats:YES
                            ];

self.strobeFlashTimer =     [
                            NSTimer scheduledTimerWithTimeInterval:flashTimePrik 
                            target:self 
                            selector:@selector(strobeFlashTimerCallback:) 
                            userInfo:nil 
                            repeats:YES
                            ];


}
- (void)strobeTimerCallback:(id)sender {
  if (strobeActivated) {
        strobeIsOn = !strobeIsOn;
        strobeFlashOn = YES;

} else {
        strobeFlashOn = NO;
}
}
- (void)strobeFlashTimerCallback:(id)sender {
if (strobeFlashOn) {
    strobeFlashOn = !strobeFlashOn;
    [self startStopStrobe:strobeIsOn];

} else {
    [self startStopStrobe:NO];
}
}

Answer 1

Just use one timer, set the time interval based on the dot, dash or space interval. For “A” which is dot space dash

• Turn on the light and set that timer to the dot interval.
• When the timer fires, turn the light off and set the timer to the space interval.
• When the timer fires, turn the light on and set the timer to the dash interval.
• When the timer fires, turn the light off.