iPhone: UIImageView Fades in - Howto? - iphone

Question

I have an UIImageView that I want to fade in.
Is there a way to enable that on an underlying UIViewController?
I have translated the simplest answer, though they all work, C# .NET for the MonoTouch users:
public override void ViewDidAppear (bool animated)
{
base.ViewDidAppear (animated);
UIView.BeginAnimations ("fade in");
UIView.SetAnimationDuration (1);
imageView.Alpha = 1;
UIView.CommitAnimations ();
}

Answer 1

Initially set the alpha of your imageview as 0 as imageView.alpha = 0;
- (void)fadeInImage
{
[UIView beginAnimations:#"fade in" context:nil];
[UIView setAnimationDuration:1.0];
imageView.alpha = 1.0;
[UIView commitAnimations];
}

Answer 2

Change the animation duration to what ever length you want.
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"myImage.png"]];
myImageView.center = CGPointMake(100, 100);
myImageView.alpha = 0.0;
[self.view addSubview:myImageView];
[UIView animateWithDuration:5.0 animations:^{
myImageView.alpha = 1.0;
}];

Answer 3

this simple code:
[UIView animateWithDuration:5.0 animations:^{
theImage.alpha = 1.0;
}];
the UIImage is in the view and is connected via an IBOutlet
you can also, set the alpha from the utility panel.

Answer 4

Use below in your UIViewController
// add the image view
[self.view addSubview:myImageView];
// set up a transition animation
CATransition *animate = [CATransition animation];
[animate setDuration:self.animationDelay];
[animate setType:kCATransitionPush];
[animate setSubtype:kCATransitionFade];
[animate setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[self layer] addAnimation:animate forKey:#"fade in"];

Answer 5

I would use UIView's +transitionWithView:duration:options:animations:completion:
It is very efficient and powerful.
[UIView transitionWithView:imgView duration:1 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
imgView.image = [UIImage imageNamed:#"MyImage"];
} completion:nil];

Answer 6

You can use this code:
Fade In Animation:
self.yourComponent.alpha = 0.0f;
[UIView beginAnimations:#"fadeIn" context:nil];
[UIView setAnimationDuration:1.0]; // Time in seconds
self.yourComponent.alpha = 1.0f;
Fade Out Animation:
self.yourComponent.alpha = 1.0f;
[UIView beginAnimations:#"fadeOut" context:nil];
[UIView setAnimationDuration:1.0]; // Time in seconds
self.yourComponent.alpha = 0.0f;
self.yourComponent can be a UIView, UIImageView, UIButton or any other component.

Answer 7

Swift version
func fadeIn(){
UIView.beginAnimations("fade in", context: nil);
UIView.setAnimationDuration(1.0);
imageView.alpha = 1.0;
UIView.commitAnimations();
}