UIImageView Animation Not Working

Question

Just started Objective-C - trying to make 4 images fadein/fadeout continuously.

The code below is not working. I know the button is working because the text of my label changes, however no pictures animate. No errors either ...

h.

#import <UIKit/UIKit.h> @interface ViewController : UIViewController { IBOutlet UIImageView *viewer; } @property (nonatomic, retain) UIImageView *viewer; @property (nonatomic,retain) IBOutlet UILabel *label1; @end

m.

-(IBAction)startImageViewAnimation { label1.text = @"CHECK?"; NSArray *animationImages = [NSArray arrayWithObjects: [UIImage imageNamed:@"backgrounds_app1-01.png"], [UIImage imageNamed:@"backgrounds_app2-02.png"], [UIImage imageNamed:@"backgrounds_app3-03.png"], [UIImage imageNamed:@"backgrounds_app4-04.png"], nil]; viewer = [[UIImageView alloc] initWithFrame:self.view.frame]; viewer.animationImages = animationImages ; viewer.animationRepeatCount = 2; viewer.animationDuration= 4.0; [viewer startAnimating]; [NSTimer scheduledTimerWithTimeInterval:4.0 target:self selector:@selector(animationDone:) userInfo:nil repeats:NO]; } -(void)animationDone:(NSTimer*)inTimer { [inTimer invalidate]; inTimer = nil; NSLog(@"animationDone "); }

change the alloc line to: viewer = [[UIImageView alloc] initWithFrame:self.view.bounds] — rounak
– rounak, Commented Apr 10, 2014 at 0:41
Does it matter that I set the image of the UIImageView? Or does it have to be blank? — Ds.109
– Ds.109, Commented Apr 10, 2014 at 0:45

rounak · Accepted Answer · 2014-04-10 00:44:57Z

2

After initialising the image view, you'll have to add it as a subview:

viewer = [[UIImageView alloc] initWithFrame:self.view.bounds]; [self.view addSubview:viewer];

answered Apr 10, 2014 at 0:44

rounak

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8 Comments

Ds.109 Over a year ago

Perfect! - 2 questions: a) what does that do? is it applicable to other situations?

Ds.109 Over a year ago

b) can the animation be smoother?

Nic Robertson Over a year ago

a: yes, without adding the subview to the view it exists, but will not show up. This counts for any view.

Nic Robertson Over a year ago

b:if you want to create a fade-in/out animation, consider using [UIView animateWithDuration] and change the alpha value of the image accordingly

rounak Over a year ago

Doubt the alpha of the image itself can be changed. You'll need to have at least two UIImageViews and change the alpha of that view.

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