Switching images using NSTimer - ios

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];

Answer 2

I think you need:
[UIView animateWithDuration:1 options:UIViewAnimationOptionCurveEaseIn
animations:^{
//Change frame here.
} completion:^ (BOOL completed) {}
];

Answer 3

Try this code. It is worked for me.
#pragma mark -
#pragma mark viewDidAppear
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
updateBCK = [NSTimer scheduledTimerWithTimeInterval:(4.0) target:self selector:#selector(changeImage) userInfo:nil repeats:YES];
[updateBCK fire];
}
#pragma mark -
#pragma mark viewDidDisAppear
-(void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
if ([updateBCK isValid]){
[updateBCK invalidate];
updateBCK = nil;
}
}
-(void)changeImage{
static int i=0;
if (i == [myImages count]){
i=0;
}
[UIImageView beginAnimations:nil context:NULL];
[UIImageView setAnimationDuration:0.6];
backgroundImageView.alpha=1;
backgroundImageView.image =[myImages objectAtIndex:i];
[UIImageView commitAnimations];
i++;
}

Answer 4

It is bug in your code. After setting isMoved = YES, you can't check if isMoved == YES.
I don't know if that is what you mean, but try this code:
-(void)imageSlide{
[UIView animateWithDuration:1 animations:^{
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;
}
else
{
CGRect frame = self.imageSlideshow.frame;
frame.origin.x = self.imageSlideshow.frame.origin.x + 320;
self.imageSlideshow.frame = frame;
NSLog(#"2 caze work");
isMoved = NO;
}
} completion:^(BOOL finished) {
}];
}
EDIT
Maybe this code will help you:
-(void)slideshow
{
static int i = 0;
UIImage * img = [UIImage imageNamed:(i % 2) ? #"ipd1.jpg" : #"ipd2.jpg"];
[UIView transitionWithView:self.imageSlideshow duration:1.0 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
self.imageSlideshow.image = img;
} completion:^(BOOL finished) {
i++;
[self performSelector:#selector(slideshow) withObject:nil afterDelay:2.0];
}];
}