Change NSTimer interval after a certain number of fires - objective-c

Question

In the following code, the NSTimer interval is set at 1 second between each picture. My goal is to change the interval after the first two pictures, hello.png and bye.png, to 4 seconds.
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *imageNames = #[#"hello.png",#"bye.png",#"helloagain.png",#"bye again"];
self.images = [[NSMutableArray alloc] init];
for (int i = 0; i < imageNames.count; i++) {
[self.images addObject:[UIImage imageNamed:[imageNames objectAtIndex:i]]];
}
self.animationImageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 95, 86, 90)];
self.animationImageView.image = self.images[0];
[self.view addSubview:self.animationImageView];
self.animationImageView.userInteractionEnabled = TRUE;
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(changeImage:) userInfo:nil repeats:YES];
}
-(void)changeImage:(NSTimer *) timer {
if (counter == self.images.count - 1 ) {
counter = 0;
}else {
counter ++;
}
self.animationImageView.image = self.images[counter];
}

Answer 1

my goal is to change the interval
You cannot change a timer in any way. To change the firing interval, invalidate and destroy the timer and make a new timer with the new interval.
To do that, you will need to have kept a reference to the timer, as a property of your view controller (something that you have fatally failed to do in your implementation - you would have had no way to stop the timer, and you would have crashed if your view controller ever went out of existence, or else your view controller would have leaked because the timer retains it).

Answer 2

Make the timer object a member variable. Initially set animation time as 1 second. In the callback invalidate the timer and create a new one with 1 or 4 seconds depending on the counter.
#interface ViewController ()
#property (strong,nonatomic) NSMutableArray *images;
#property (strong,nonatomic) UIImageView *animationImageView;
{
NSTimer *_timer;
}
#end
#implementation ViewController {
NSInteger counter;
}
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *imageNames = #[#"hello.png",#"bye.png",#"helloagain.png",#"bye again"];
self.images = [[NSMutableArray alloc] init];
for (int i = 0; i < imageNames.count; i++) {
[self.images addObject:[UIImage imageNamed:[imageNames objectAtIndex:i]]];
}
self.animationImageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 95, 86, 90)];
self.animationImageView.image = self.images[0];
[self.view addSubview:self.animationImageView];
self.animationImageView.userInteractionEnabled = TRUE;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(bannerTapped:)];
singleTap.numberOfTapsRequired = 1;
singleTap.numberOfTouchesRequired = 1;
[self.animationImageView addGestureRecognizer:singleTap];
_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(changeImage:) userInfo:nil repeats:YES];
}
-(void)changeImage:(NSTimer *) timer {
[_timer invalidate];
if (counter == self.images.count - 1 ) {
counter = 0;
}else {
counter ++;
}
if(counter == 0 || counter == 1)
{
_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(changeImage:) userInfo:nil repeats:YES];
}
else if(counter == 2 || counter == 3)
{
_timer = [NSTimer scheduledTimerWithTimeInterval:4 target:self selector:#selector(changeImage:) userInfo:nil repeats:YES];
}
self.animationImageView.image = self.images[counter];
}

Answer 3

The best/simpliest way :
-(void)Timer{
// Do what you want here
// modify the frequency value if you want.
[NSTimer scheduledTimerWithTimeInterval:frequence target:self selector:#selector(Timer) userInfo:nil repeats:NO];
}
Frequence is a variable that contains the interval.
You just need to call Timer method by yourself the first time ;)
For you, it would give
-(void)changeImage{
if (counter == self.images.count - 1 )
counter = 0;
else
counter ++;
frequence = (counter < 2)?1:4;
self.animationImageView.image = self.images[counter];
[NSTimer scheduledTimerWithTimeInterval:frequence target:self selector:#selector(changeImage) userInfo:nil repeats:NO];
}