Animations Back to back After Completion of one in objective c - ios

Question

I want to do continuous animation in 3 imageviews back to back I have use the below code but it shows me animation in only first imageview.I debug Code, it will Go in method but it won't show Any animation in remaining.Below is my Code
-(void)imageNewsAnimation
{
[UIView animateWithDuration:0.35f animations:^{
_imgNews.animationImages=arrnews;
_imgNews.animationDuration=1;
_imgNews.animationRepeatCount=1;
_imgNews.image = [_imgNews.animationImages lastObject];
[_imgNews startAnimating];
} completion:^(BOOL finished) {
[_imgNews stopAnimating];
[self imageEventAnimation];
} ];
}
-(void)imageEventAnimation
{
[UIView animateWithDuration:0.35f delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
_imgEvents.animationImages=arrEvents;
_imgEvents.animationDuration=1;
_imgEvents.animationRepeatCount=1;
_imgEvents.image = [_imgEvents.animationImages lastObject];
[_imgEvents startAnimating];
} completion:^(BOOL finished) {
[self imageDirectoryAnimation];
} ];
}
-(void)imageDirectoryAnimation
{
[UIView animateWithDuration:0.35f animations:^{
_imgDirectory.animationImages=arrdir;
_imgDirectory.animationDuration=1;
_imgDirectory.animationRepeatCount=1;
_imgDirectory.image = [_imgDirectory.animationImages lastObject];
[_imgDirectory startAnimating];
} completion:^(BOOL finished) {
[self imageInfoAnimation];
} ];
}
-(void)imageInfoAnimation
{
[UIView animateWithDuration:0.35f animations:^{
_imgInfo.animationImages=arrinfo;
_imgInfo.animationDuration=1;
_imgInfo.animationRepeatCount=1;
_imgInfo.image = [_imgInfo.animationImages lastObject];
[_imgInfo startAnimating];
} completion:^(BOOL finished) {
[self imageDirectoryAnimation];
} ];
}

Answer 1

Since startAnimating doesn't have a completion handler, I would set up something like this:
CycleImageView.h
#import <UIKit/UIKit.h>
typedef void (^CycleCompletion)(BOOL finished);
#interface CycleImageView : UIImageView
- (void)startAnimatingWithImages:(NSArray<UIImage *>*)images completion:(CycleCompletion)completion;
#end
CycleImageView.m
#import "CycleImageView.h"
#interface CycleImageView()
#property (nonatomic, copy) CycleCompletion completion;
#end
#implementation CycleImageView
- (void)startAnimatingWithImages:(NSArray<UIImage *>*)images completion:(CycleCompletion)completion {
self.completion = completion;
NSMutableArray *imageRefs = [NSMutableArray array];
for (NSInteger i = 0; i < images.count; i++) {
[imageRefs addObject:(id)images[i].CGImage];
}
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:#"contents"];
animation.delegate = self;
animation.calculationMode = kCAAnimationDiscrete;
animation.duration = 1;
animation.values = imageRefs;
animation.repeatCount = 1;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
[self.layer addAnimation:animation forKey:#"animation"];
}
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
if (self.completion != nil) {
self.completion(flag);
self.completion = nil;
}
}
#end
To use it:
Make imgNews, imgEvents, imgDirectory, and imgInfo all subclasses of CycleImageView. Then, using your supplied methods and variables, the implementation would change to this:
- (void)imageNewsAnimation {
[_imgNews startAnimatingWithImages:arrnews completion:^(BOOL finished) {
if (finished) {
[self imageEventAnimation];
}
}];
}
- (void)imageEventAnimation {
[_imgEvent startAnimatingWithImages:arrEvents completion:^(BOOL finished) {
if (finished) {
[self imageDirectoryAnimation];
}
}];
}
- (void)imageDirectoryAnimation {
[_imgDirectory startAnimatingWithImages:arrdir completion:^(BOOL finished) {
if (finished) {
[self imageInfoAnimation];
}
}];
}
- (void)imageInfoAnimation {
[_imgInfo startAnimatingWithImages:arrinfo completion:^(BOOL finished) {
if (finished) {
// NOTE: Are you intentionally creating this indefinite animation loop?
[self imageDirectoryAnimation];
}
}];
}
Edit:
Created a gist for CycleImageView, as well.

Answer 2

Perform animation with timer like
In viewDidLoad:
timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(imageAnimation:) userInfo:nil repeats:YES];
i = 0;
then
- (void)imageAnimation:(UIImage *) image {
i++;
if (i > 2) {
i = 0;
}
NSArray *arr = #[[UIImage imageNamed:#"img1"],[UIImage imageNamed:#"img2"],[UIImage imageNamed:#"img3"]];
UIImage * toImage = [arr objectAtIndex:i];
[UIView transitionWithView:self.view
duration:2
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
self.imageview.image = toImage;
} completion:NULL];
}
Hope this help!