transitionWithView gets called repeatedly after ViewController is dismissed - objective-c

Question

This is in a ModalViewController using StoryBoard and ARC
When I dismiss the view I see this line...
NSLog(#"%d %#",[imgArray count],fileName); ... being printed over and over again.
How do I kill the functions transitionWithView/animateWithDuration when the view is dismissed?
Missing something quite crucial!
.h
#import <UIKit/UIKit.h>
#interface InfoVC : UIViewController
#property (weak, nonatomic) IBOutlet UIImageView *imageview;
#property (weak, nonatomic) IBOutlet UIScrollView *scrollview;
#end
.m
#import "InfoVC.h"
#import <QuartzCore/QuartzCore.h>
#interface InfoVC ()
#end
#implementation InfoVC {
int randomInt;
NSArray *imgs;
NSMutableArray *imgArray;
NSTimer *myTimer;
NSTimer *myTimer2;
NSString *currentImg;
}
- (void)viewDidLoad
{
[super viewDidLoad];
imgs = [NSArray arrayWithObjects:
#"01.jpg",
#"02.jpg",
#"03.jpg",
nil];
imgArray = [imgs mutableCopy];
[self initialImage];
}
- (void)initialImage
{
_imageview.contentMode = UIViewContentModeLeft;
int rnd = [imgArray count];
randomInt = (arc4random()%rnd);
currentImg = [imgArray objectAtIndex:randomInt];
UIImage *image = [UIImage imageNamed:currentImg];
[_imageview setImage:image];
_imageview.bounds = CGRectMake(0, 0, image.size.width, image.size.height);
_scrollview.contentSize = image.size;
_scrollview.contentOffset = CGPointMake(-150.0, 0.0);
[imgArray removeObjectAtIndex: randomInt];
[self animate];
}
- (void)randomImage
{
if ([imgArray count]==0) {
imgArray = [imgs mutableCopy];
}
int rnd = [imgArray count];
randomInt = (arc4random()%rnd);
NSString *fileName = [imgArray objectAtIndex:randomInt];
NSLog(#"%d %#",[imgArray count],fileName);
[imgArray removeObjectAtIndex: randomInt];
UIImage * toImage = [UIImage imageNamed:fileName];
void (^completion)(void) = ^{
[self animate];
};
[UIView transitionWithView:self.view
duration:1.75f
options:UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowUserInteraction
animations:^
{
_imageview.image = toImage;
}
completion:^(BOOL finished)
{
completion();
}
];
}
- (void)animate{
CGPoint offset = _scrollview.contentOffset;
float flt = 150.0;
if (_scrollview.contentOffset.x == flt)
{
offset.x = 0.0 ;
}
else
{
offset.x = flt ;
}
void (^completion2)(void) = ^{
[self randomImage];
};
[UIView animateWithDuration:5.0 delay:0 options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationCurveEaseIn
animations:^{
_scrollview.contentOffset = offset;
}completion:^(BOOL completed){
completion2();
}
];
}
- (void)viewDidUnload
{
[super viewDidUnload];
[_scrollview.layer removeAllAnimations];
[_imageview.layer removeAllAnimations];
}
- (IBAction)dismissInfo:(id)sender
{
[_scrollview.layer removeAllAnimations];
[_imageview.layer removeAllAnimations];
[self dismissModalViewControllerAnimated:YES];
}

Answer 1

I tried using a gazillion things retro fitting transitionWithView with CABasicAnimation, using NSTimer etc.
In the end I just did:
[_imageview removeFromSuperview];
when dismissing the view and all was great.
But from other posts on here it appears there is a bug hen when applying an alpha transition to a UIScrollview - the reference to the view is lost when it's transparent.