Switching images using NSTimer

Question

I have couple of images i want to switch. There is a simple function i made for do this:

-(void)imageSlide{

if (!isMoved){
CGRect frame = self.imageSlideshow.frame;
frame.origin.x = self.imageSlideshow.frame.origin.x - 320;
self.imageSlideshow.frame = frame;
NSLog(@"1 caze work");
isMoved = YES;
}

if (isMoved){
CGRect frame = self.imageSlideshow.frame;
frame.origin.x = self.imageSlideshow.frame.origin.x + 320;
self.imageSlideshow.frame = frame;
NSLog(@"2 caze work");
isMoved = NO;
}
}

There is NSTimer which call that function:

[NSTimer scheduledTimerWithTimeInterval:2.0
                                         target:self
                                       selector:@selector(imageSlide)
                                       userInfo:nil
                                        repeats:YES];

BOOL isMoved; placed in implementation of class.

What i want is, to remove an image and then, shown again (and repeat it every 2 seconds). It would be nice to have smooth animation as well.

That code:

for (int i=0; i<99; i++){

        self.imageSlideshow.image = [UIImage imageNamed:(i % 2) ? @"ipd1.jpg" : @"ipd2.jpg"];

        CATransition *transition = [CATransition animation];
        transition.duration = 1.0f;
        transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        transition.type = kCATransitionFade;

        [self.imageSlideshow.layer addAnimation:transition forKey:nil];
    }

Also not working, no idea why. Image stand still. I did import quartz library and include headers.

Answer 1

you can acheive this by using this code :-

#import <QuartzCore/QuartzCore.h>
...
imageView.image = [UIImage imageNamed:(i % 2) ? @"3.jpg" : @"4.jpg"];

CATransition *transition = [CATransition animation];
transition.duration = 2.0f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;

[imageView.layer addAnimation:transition forKey:nil];

and NSTimer Job should be done here by transition.duration. So, no need of NSTimer anymore here.

Courtesy :- https://stackoverflow.com/a/2834693/1865424

This piece of code works too :-

 // create the view that will execute our animation
 UIImageView* imageSlideshow = [[UIImageView alloc] initWithFrame:self.view.frame];

 // load all the frames of our animation
 imageSlideshow.animationImages = [NSArray arrayWithObjects:    
                             [UIImage imageNamed:@“ipd1.jpg"],
                             [UIImage imageNamed:@“ipd2.jpg"], nil];

 // all frames will execute in 1.75 seconds
 imageSlideshow.animationDuration = 1.75;
 // repeat the animation forever
 imageSlideshow.animationRepeatCount = 0;
 // start animating
 [imageSlideshow startAnimating];
 // add the animation view to the main window 
 [self.view addSubview:imageSlideshow];