i want to replicate the animation when an app starts on iPhone.
There is the first view scaling up from 50 % to 100% i think.
later I want to use this as a transition between 2 views.
Any ideas how to replicate, or is there a ready to use solution from apple in the sdk?
Thank you very much :)
You can do the same thing with CABasicAnimation and CAAnimationGroup, I actually thought that Core Animation over UIKit Animations was smoother and It gives you more control.
CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.removedOnCompletion = YES;
CABasicAnimation *fadeAnimation = [CABasicAnimation animationWithKeyPath:#"opacity"];
fadeAnimation.fromValue = [NSNumber numberWithFloat:0.0];
fadeAnimation.toValue = [NSNumber numberWithFloat:1.0];
CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
scaleAnimation.fromValue = [NSNumber numberWithFloat:0.5];
scaleAnimation.toValue = [NSNumber numberWithFloat:1.00];
animationGroup.animations = [NSArray arrayWithObjects:fadeAnimation, scaleAnimation, nil];
[self.layer addAnimation:animationGroup forKey:#"fadeAnimation"];
self.layer.opacity = 1.0;
"There's always more then one way to skin a cat"
You can apply a scale transform to the UIView and then animate it back to it's normal state.
// Set the the view's scale to half
[viewToScale setTransform:CGAffineTransformMakeScale(0.5,0.5)];
// Set the transform back to normal (identity) in an animation when you're
// ready to animate
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0];
[viewToScale setTransform:CGAffineTransformIdentity];
[UIView commitAnimations];
The trick will be you will need to set the view to the smaller scale in a separate run cycle from the animation or you won't see the view animate. So you can set the smaller scale and then call -performSelector:withObject:afterDelay: to actually perform the animation.
Related
In this code i am using animation.But at a time i need to change the image alpha value also.
-(void)animation
{
CGPoint point = CGPointMake(imgView.frame.origin.x, imgView.frame.origin.y);
imgView.layer.position = point;
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:#"position.x"];
anim.fromValue = [NSValue valueWithCGPoint:point];
anim.toValue = [NSValue valueWithCGPoint:CGPointMake(point.x + 50, point.y)];
anim.duration = 10.0f;
anim.repeatCount =1;
anim.removedOnCompletion = YES;
anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[imgView.layer addAnimation:anim forKey:#"position.x"];
imgView.layer.position = point;
}
You can use the opacity key of CABasicAnimation for doing this:
CABasicAnimation *alphaAnimation = [CABasicAnimation animationWithKeyPath:#"opacity"];
alphaAnimation.fromValue = [NSNumber numberWithFloat:1.0];
alphaAnimation.toValue = [NSNumber numberWithFloat:0.0];
[imgView.layer addAnimation:alphaAnimation forKey:#"opacity"];
Edit:
For animating through specified values you can use CAKeyframeAnimation:
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:#"opacity"];
animation.duration = 10.0f;
animation.repeatCount = 1;
animation.values = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:1.0,
[NSNumber numberWithFloat:0.5],
[NSNumber numberWithFloat:1.0],nil];
animation.keyTimes = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0],
[NSNumber numberWithFloat:5.0],
[NSNumber numberWithFloat:10.0], nil];
[imgView.layer addAnimation:animation forKey:#"opacity"];
In order to decrease the alpha as the same time/rate the x position of your view is moving, just put the position setting code together with the alpha setting code in the same block of animation, like below:
CGPoint finalPoint = CGPointMake(500, imgView.center.y); //change for any final point you want
CGFloat finalAlpha = 0.0; //change the final alpha as you want
UIView animateWithDuration:1.0 animations:^{ //change the duration as you want
imgView.alpha = finalAlpha;
imgView.center = finalPoint;
}];
This "fades to invisible" self.view in 500ms.
Anything you do prior to invoking it will be set "immediately", everything you set within the `animation' block (like setting new frame coordinates) will be interpolated over the specified duration.
[UIView animateWithDuration:0.50
delay:0.0
options:( UIViewAnimationOptionAllowUserInteraction
| UIViewAnimationOptionBeginFromCurrentState
| UIViewAnimationOptionCurveEaseInOut)
animations:^ {
self.view.alpha = 0.0f ;
}
completion: ^(BOOL){
[self.view removeFromSuperview] ;
self.view = nil ;
}
] ;
You may use a CABasicAnimation object (a different one because you will animate a different KeyPath, namely alpha, for this) and use NSNumbers for fromValue and toValue.
Another (and easiest) way is to use the UIView helper methods dedicated to animation ( animateWithDuration:… and all), especially if you have to animate multiple properties at the same time (you may animate both the frame and the alpha with the same animation block if it fits your needs and simplify your code).
You can also mix CABasicAnimation for the frame and [UIView animateWithDuration:…] for the alpha, whatever combination you need depending on if your animations are complex and need to be customized (custom timing function, non-linear animation, …) or not.
//your code of changing x position will be here
now implement my code which is written below.
UIView animateWithDuration:1.0 animations:^{
imgView.alpha = 0.5;//must be in between 0 to 1
}];
now when your imageview move to next position as you are saying, write below code
//your code for imageview for next position..
now implement below code...
UIView animateWithDuration:0.5 animations:^{
imgView.alpha = 1.0;//must be in between 0 to 1
}];
let me know it is working or not!!!! Hope it helps...
Happy Coding!!!
I'm trying to make a simple "rotating gear animation." Basically, I want to put a circle on the screen at a certain position, and give this circle an image of gear (or just make the image rotating without creating a circle at first). Also, the gear should keep rotating. How can I achieve that?
I'm beginner to ios development. If anyone can provide a simple sample code, I will really appreciate that!
You have to actually rotate a UIImageView infinitely.
Firstly #import <QuartzCore/QuartzCore.h>
- (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations: (CGFloat)rotations repeat:(float)repeat;
{
CABasicAnimation* rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/ * rotations * duration ];
rotationAnimation.duration = duration;
rotationAnimation.cumulative = YES;
rotationAnimation.repeatCount = repeat;
[view.layer addAnimation:rotationAnimation forKey:#"rotationAnimation"];
}
Assume that you have a UIImageView and assign an image on it and named ImgView. On viewDidLoad, add your code as below:
[UIView beginAnimations:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationRepeatCount:MAXFLOAT];
ImgView.transform = CGAffineTransformMakeRotation(M_PI);
[UIView commitAnimations];
From the links :-
UIView Infinite 360 degree rotation animation?
Infinite rotating image background UIImageView
I am rotating the Image 360 clockwise using the CABasicAnimation, and the code which I am using is
CALayer* _caLayer = [CALayer layer];
_caLayer.contents = (id)_logo.CGImage;
_caLayer.frame = CGRectMake(65,158, 180,55);
[self.view.layer addSublayer:_caLayer];
CABasicAnimation* rotation;
rotation = [CABasicAnimation animationWithKeyPath:#"transform.rotation"];
rotation.fromValue = [NSNumber numberWithFloat:0];
rotation.toValue = [NSNumber numberWithFloat:((360*M_PI)/180)];
rotation.duration = 1.4f;
//rotation.beginTime = CACurrentMediaTime() +1;
rotation.repeatCount = 2.0;
rotation.fillMode = kCAFillModeForwards;
[_caLayer addAnimation:rotation forKey:#"360"];
The animation is working fine.. But I cant figure out one thing. I want to start animate the image from smaller size and ends with the normal size. You have seen in movies like some newspapers will rotate fast and they fade in and finally we will see the paper in the screen fully. I am trying to do that way. I dont know how to do it, please !
You can use the following also, will works like a charm
[UIView beginAnimations:#"fade in" context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
_imageView.alpha = 0.0;
_newImageView.alpha = 1.0;
[UIView commitAnimations];
Set the imageView frame before animation: [imageView setFrame: CGRectMake(your Frame)];
then keep on increasing the frame in the animation using a loop or something..
I want to crossfade between two different UIImages but for a reason i cannot figure out my first UIImage stays when the second one fades in.
Here is the sourcecode of my animation (it does a lot more than just crossfading, but the crossfading is my only problem right now).
I need all of the three animations listed below to be executed at the same time.
CGMutablePathRef thePath = CGPathCreateMutable();
CGPathMoveToPoint(thePath,NULL,startPoint.x, startPoint.y);
CGPathAddLineToPoint(thePath, NULL, endPoint.x, endPoint.y);
CAKeyframeAnimation *positionAnimation =[CAKeyframeAnimation animationWithKeyPath:#"position"];
positionAnimation.path=thePath;
positionAnimation.duration=ti_duration;
positionAnimation.repeatCount=0;
positionAnimation.delegate = self;
positionAnimation.autoreverses=NO;
positionAnimation.fillMode=kCAFillModeForwards;
positionAnimation.removedOnCompletion = NO;
[self.layer addAnimation:positionAnimation forKey:s_direction];
CABasicAnimation *crossFade = [CABasicAnimation animationWithKeyPath:#"contents"];
crossFade.duration = ti_duration;
crossFade.fromValue = (id)img_startImage.CGImage;
crossFade.toValue = (id)img_transferImage.CGImage;
[self.iv_image.layer addAnimation:crossFade forKey:#"animateContentsToTransferState"];
[self.iv_image setImage:img_transferImage];
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
theGroup.duration = ti_duration;
theGroup.repeatCount = 0;
theGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
theGroup.animations = [NSArray arrayWithObjects:/*positionAnimation,*/ crossFade, nil]; // you can add more
[self.layer addAnimation:theGroup forKey:#"move"];
[UIView beginAnimations:#"changeSize" context:nil];
[UIView setAnimationDuration:duration];
self.bounds = CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.transferSize.width, self.transferSize.height);
[UIView commitAnimations];
The animation method containing this sourcecode is in a subclass of UIView. This subclass contains several UIImages and one UIImageView where the image to be displayed is contained in.
Have i forgotten some essential thing or why is my first image not fading away?
Can it be because it is animated from some other animation at the same time?
I hope someone can help me with this.
Greets
Maverick
Think of CAAnimations as operations applied to the CALayer. The animations current state do not change the layers original contents.
When the original state seems to snap back at the end of the animation it is actually just the animations operation being removed, and the real layers state is being revealed again.
What you need to do is to register a delegate for your animation, and change the actual self.layer.contents when the animation ends.
First:
crossFade.delegate = self;
Then implement:
- (void)animationDidStop:(CABasicAnimation *)animation finished:(BOOL)flag {
self.layer.contents = animation.toValue;
}
Try this code...It worked for me.
-(void)crossFadeImage{
CABasicAnimation *crossFade = [CABasicAnimation animationWithKeyPath:#"contents"];
crossFade.duration = 2.0;
crossFade.fromValue = img1.CGImage;
crossFade.toValue = img2.CGImage;
[self.background.layer addAnimation:crossFade forKey:#"animateContents"];
self.background.image = img2;
}
I'm new to iPhone development, and doing some experimentation with Core Animation. I've run into a small problem regarding the duration of the animation I'm attempting.
Basically, Ive got a view with two subviews, and I'm trying to animate their opacity so that one fades in while the other fades out. Problem is, instead of a gradual fade in/out, the subviews simply switch instantly to/from full/zero opacity. I've tried to adjust the animation duration with CATransaction with no noticable effect. It's also not specific to animating opacity - animating position shows the same problem.
The code I'm using (inside a method of the superview) follows:
CALayer* oldLayer = ((UIView*) [[self subviews] objectAtIndex:0]).layer;
CALayer* newLayer = ((UIView*) [[self subviews] objectAtIndex:1]).layer;
[CATransaction begin];
[CATransaction setAnimationDuration:1.0f];
oldLayer.opacity = 0.0;
newLayer.opacity = 1.0;
[CATransaction commit];
Does anyone have an idea what the problem might be?
Noah's solution is the cleanest way to do what you want, but the reason why you're not seeing the animation is that implicit animations are disabled for CALayers that back UIViews. Because nothing is animating, the CATransaction is unable to set the duration for anything.
If you really wanted to perform this animation on the layer, you'd need to set up a manual CABasicAnimation to do this:
CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:#"opacity"];
opacityAnimation.removedOnCompletion = NO;
opacityAnimation.fillMode = kCAFillModeForwards;
[oldLayer addAnimation:opacityAnimation forKey:#"opacity"];
[newLayer addAnimation:opacityAnimation forKey:#"opacity"];
[CATransaction begin];
[CATransaction setAnimationDuration:1.0f];
oldLayer.opacity = 0.0;
newLayer.opacity = 1.0;
[CATransaction commit];
(Note that I'm not sure if you can re-use the opacity animation here. You might need to create separate instances for each layer.)
Is there a reason you're using Core Animation over the generic UIView animation wrapper? It's pretty straightforward to do something like this with
UIView *oldView = [[self subviews] objectAtIndex:0];
UIView *newView = [[self subviews] objectAtIndex:1];
[UIView beginAnimations:#"swapViews" context:nil];
[UIView setAnimationDuration:1];
oldView.alpha = 0;
newView.alpha = 1;
[UIView commitAnimations];
Do you need to use an explicit CATransaction here?
The docs here imply that you don't.