How to Check Playback Time of Audioplayer increases by 2 seconds - objective-c

Question

I m trying to write a loop to check that whenever audio player.currenttime increases by 2 seconds then it should execute update view method
- (void)myTimerMethod{
NSLog(#"myTimerMethod is Called");
myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(checkPlaybackTime:)
userInfo:nil
repeats:YES];
}
- (void)checkPlaybackTime:(NSTimer *)theTimer
{
float seconds = audioplayer.currenttime;
NSLog(#"Cur: %f",audioPlayer.currentTime );
if (seconds = seconds + 2){
[self update view];
}
- (void)UpdateView{
if (index < [textArray count])
{
self.textView.text = [self.textArray objectAtIndex:index];
self.imageView.image = [self.imagesArray objectAtIndex:index];
index++;
}else{
index = 0;
}
}
what is the correct way to write if audio player.currenttimer increases by 2 seconds then do this.
NSLog for current time always shows 0.00. Why is that. It should increase as the audioplayer is playing.
Thanks for help.

Answer 1

What i understood from your given explanation that you want to increment the time-interval something like this
Timer calls after 0.55
Timer calls after 0.60
Timer calls after 0.65
Timer calls after 0.70
& so on.
If that is what you are looking to do. Then i think you can do this way that by changing repeats:YES to repeats:NO so that the timer doesn't repeat, and then in onTimer, just start a new timer with a longer interval.
You need a variable to hold your interval so that you can make it a bit longer each time through onTimer.
Also, you probably don't need to retain the timer anymore, as it will only fire once, and when it does, you'll get a new timer.
float gap = 0.50;
[NSTimer scheduledTimerWithTimeInterval:gap target:self selector:#selector(onTimer) userInfo:nil repeats:NO];
-(void) onTimer {
gap = gap + .05;
[NSTimer scheduledTimerWithTimeInterval:gap target:self selector:#selector(onTimer) userInfo:nil repeats:NO];
}
Hope this helps you

Answer 2

First, try using your float "seconds" in your NSLog rather than the current time.
NSLog(#"Cur: %f", seconds);
current time is not a float, it's an NSTimer object so you would have to use %# in your NSLog text so
NSLog(#"Cur: %#",audioPlayer.currentTime );
Should work as well.
Assuming your audioPlayer is set up correctly, if you're looking for when the timer is at 2 seconds, your if statement will be
if(seconds == 2){
[self update view];
}
if you're looking for each time the timer hits an even number, i.e. 2, 4, 6, etc. your if statement will be
if(seconds % 2 == 0){
[self update view];
}
The % in an if statement is the modulo sign: http://www.cprogramming.com/tutorial/modulus.html
Also, your current if statement is assigning rather than checking the seconds variable. To check it, you need == not =. However, your current if statement will never be true since you're checking a variable by itself + 2. To put this another way, if seconds equals 2, your if statement is asking if 2 == (2+2) or if it it is 4, it's asking if 2 == (4+2). This statement cannot validate as true.
Hope this helps!