I've found this code snippet:
[self setValue:direction forKey:#"currentDirection"];
CAKeyframeAnimation * animation = [CAKeyframeAnimation animationWithKeyPath:#"position"];
animation.path = path;
animation.duration = grids * gridWidth / [self speed];
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
animation.delegate = self;
animation.calculationMode = kCAAnimationLinear;
[self addAnimation:animation forKey:#"movement"];
self.position = destination;
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:_turn_duration]
forKey:kCATransactionAnimationDuration];
eyes.position = eyeDestination;
pupils.position = pupilDestination;
[CATransaction commit];
CGPathRelease(path);
What's the point of using the CATransaction here?
To set the duration of the two implicit animations within the transaction to a value different from the duration of the keyframe animation above. The animations inside the transaction will run over _turn_duration seconds, while the keyframe animation will run over grids * gridWidth / [self speed] seconds.
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 animating a clock arm from pointing towards 12 o'clock to the current time. If it is say, 11 o'clock, I want the arm to rotate clockwise to the 11 o'clock position. But of course if I use:
CGAffineTransform rotation = CGAffineTransformMakeRotation(2*M_PI*11/12);
[UIView animateWithDuration:3.0
animations:^{
clockArm.transform = rotation;
}];
the rotation goes counterclockwise. I tried:
CGFloat angle = 2*M_PI*11/12;
CGAffineTransform firstRotation = CGAffineTransformMakeRotation(M_PI-0.001);
CGFloat firstRotationTime = 3.0*(M_PI/angle);
CGAffineTransform secondRotation = CGAffineTransformMakeRotation(angle);
CGFloat secondRotationTime = 3.0 - firstRotationTime;
[UIView animateWithDuration:firstRotationTime
delay:0.0
options:UIViewAnimationCurveLinear
animations:^{
self.clockArm1.transform = firstRotation;
}
completion:^(BOOL finished) {
[UIView animateWithDuration:secondRotationTime
delay:0.0
options:UIViewAnimationCurveLinear
animations:^{
self.clockArm1.transform = secondRotation;
}
completion:^(BOOL finished){
}];
}];
The animation does go clockwise, but it is choppy - the animation still seems to be doing a UIViewAnimationEaseInOut for the first animation. What am I doing wrong, or is there another way to accomplish what I want?
You can use the completion block of CATransaction to set the rotation property of the view when the animation has finished. The following function worked in my test case:
- (void) rotateViewAnimated:(UIView*)view
withDuration:(CFTimeInterval)duration
byAngle:(CGFloat)angle
{
[CATransaction begin];
CABasicAnimation *rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
rotationAnimation.byValue = [NSNumber numberWithFloat:angle];
rotationAnimation.duration = duration;
rotationAnimation.removedOnCompletion = YES;
[CATransaction setCompletionBlock:^{
view.transform = CGAffineTransformRotate(view.transform, angle);
}];
[view.layer addAnimation:rotationAnimation forKey:#"rotationAnimation"];
[CATransaction commit];
}
You use it like
[self rotateViewAnimated:self.clockArm1 withDuration:3.0 byAngle:2*M_PI*11./12.];
Thanks for #Martin R 's accepted answer. I edited a bit:
I replaced this line
rotationAnimation.removedOnCompletion = YES;
with these two lines:
rotationAnimation.removedOnCompletion = NO;
rotationAnimation.fillMode = kCAFillModeForwards;
Then, in the CompletionBlock, I added one more line:
[view.layer removeAllAnimations];
So, the code finally becomes:
- (void) rotateViewAnimated:(UIView*)view
withDuration:(CFTimeInterval)duration
byAngle:(CGFloat)angle
{
[CATransaction begin];
CABasicAnimation *rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
rotationAnimation.byValue = [NSNumber numberWithFloat:angle];
rotationAnimation.duration = duration;
// changed by me
rotationAnimation.removedOnCompletion = NO;
rotationAnimation.fillMode = kCAFillModeForwards;
[CATransaction setCompletionBlock:^{
view.transform = CGAffineTransformRotate(view.transform, angle);
// added by me
[view.layer removeAllAnimations]; // this is important
}];
[view.layer addAnimation:rotationAnimation forKey:#"rotationAnimation"];
[CATransaction commit];
}
My references are from:
1, https://stackoverflow.com/a/3586433/2481444
2, After rotating a CALayer using CABasicAnimation the layer jumps back to it's unrotated position
As mentioned in comments, try this iphone UIImageView rotation
or UIView Infinite 360 degree rotation animation?
#import <QuartzCore/QuartzCore.h>
- (void) runSpinAnimationWithDuration:(CGFloat) duration;
{
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 = 1.0;
rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
[myView.layer addAnimation:rotationAnimation forKey:#"rotationAnimation"];
}
I am using the code below to try and get my recognizer to continue spinning after the state has ended. It only seems to get one rotation no matter how high I set the value in the CGAffineTransformRotate.
Any insight or suggestions would be appreciated.
Thanks.
if([(UIRotationGestureRecognizer*)recognizer state] == UIGestureRecognizerStateEnded)
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:6.55];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, 1000000000);
[UIView commitAnimations];
}
You might want to try to use a CABasicAnimation
- (void)rotate {
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:2.0] forKey:kCATransactionAnimationDuration];
CABasicAnimation *animation;
animation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
animation.fromValue = [NSNumber numberWithFloat:0.0];
animation.toValue = [NSNumber numberWithFloat:2 * M_PI];
animation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionLinear];
animation.delegate = self;
[recognizer.layer addAnimation:animation forKey:#"rotationAnimation"];
[CATransaction commit];
}
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)finished {
if (finished)
[self rotate];
}
This will cause the rotation to continue until you specify to remove the animation.
There's more infomation and options in the CABasicAnimation Class Reference
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGFloat coef = tempCount / 20;
while(tempCount >= 0)
{
[imgView setTransform: CGAffineTransformRotate([imgView transform], -1*coef)];
tempCount -=coef;
[NSThread sleepForTimeInterval: 0.09];
}
}
And the problem is in than, that my image on the image view updates only after cycle. I want it to update every 0.09 seconds. What can you propose? Thanx!
If you want to rotate a view with animation use animation facilities SDK provides for you. To rotate your view on full 360 degrees you will need to use core animation.
The following code will rotate your view during 3 sec:
#import <QuartzCore/QuartzCore.h>
...
CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat: 2*M_PI];
animation.duration = 3.0f;
animation.repeatCount = 1.0f;
[imgView.layer addAnimation:animation forKey:#"MyAnimation"];
Or try the following - I have not tested the code, but it should reset view's transform to identity with animation:
[UIView beginAnimations:#"Reset dial" context: nil];
[UIView setAnimationDuration: 1.0f];
[UIView setAnimationCurve: UIViewAnimationCurveEaseOut];
[imgView setTransform:CGAffineTransformIdentity];
[UIView commitAnimations];
So, I have read in the docs, that use of blocks like
beginAnimation
commitAnimation
is discouraged from os4.0.
So I have tried to get my code to work by using CABasicAnimation. I want to achieve, that an image's frame is resized from its thumbnail size, somewhere within my view, to a full width position e.g. (0, 120, 320, 240) - on my iPhone.
What I have so far:
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:1.0] forKey:kCATransactionAnimationDuration];
CABasicAnimation *scalingAnimation;
scalingAnimation = [CABasicAnimation animationWithKeyPath:#"transform"];
scalingAnimation.duration=1.0/2;
scalingAnimation.autoreverses=YES;
scalingAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
scalingAnimation.fromValue=[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)];
scalingAnimation.toValue=[NSValue valueWithCATransform3D:CATransform3DMakeScale(4, 4, 1)];
[b.layer addAnimation:scalingAnimation forKey:#"scaling"];
[CATransaction commit];
My nextstep would be to first try to move the image to a centered position then scale it to the correct size. However, I doubt I'm doin it the right way. Can anyone comment on my code/approach.... is there a better way?
Am pretty sure you have solved this by now, but in any case.
You shouldn't need the [CATransaction begin]; and [CATransaction commit];
The simplest way that I have found to do this kind of thing is to use CAAnimationGroup and and add the animations one by one.
An example would be
CABasicAnimation *scaleX = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
//this is not used, as the group provides the duration
scaleX.duration = duration;
scaleX.autoreverses = NO;
scaleX.toValue = [NSNumber numberWithFloat:1.0];
scaleX.fromValue = [NSNumber numberWithFloat:scaleFrom];
scaleX.fillMode = kCAFillModeForwards;
scaleX.removedOnCompletion = NO;
CABasicAnimation *scaleY = [CABasicAnimation animationWithKeyPath:#"transform.scale.y"];
//this is not used, as the group provides the duration
scaleY.duration = duration;
scaleY.autoreverses = NO;
scaleY.toValue = [NSNumber numberWithFloat:1.0];
scaleY.fromValue = [NSNumber numberWithFloat:scaleFrom];
scaleY.fillMode = kCAFillModeForwards;
scaleY.removedOnCompletion = NO;
//add in the translation animations
NSMutableArray* animationsArray = [NSMutableArray arrayWithObjects:scaleX,
scaleY,
//and any other animations you want in the group
nil];
CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.duration = 1.0/2;
animationGroup.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseIn];
animationGroup.animations = animationsArray;
animationGroup.delegate = self;
animationGroup.removedOnCompletion = YES;
animationGroup.fillMode = kCAFillModeForwards;
[animationGroup setValue:#"imageTransform" forKey:#"AnimationName"];
[b.layer addAnimation:animationGroup forKey:#"imageTransform"];
There are a few gotchas though. Animations are purely visual, so before running the animations, set your eventual view frame.
You will notice that the scales end at 1, this is to ensure that you dont end up with a scaled image layer. Instead we start it scaled and bring it back to normal.
Translations should be done in the same way.
Hope this helps
//in Event Method Copy Below code to place the image to the center
CABasicAnimation* positionAnimation;
positionAnimation = [CABasicAnimation animationWithKeyPath:#"position"];
positionAnimation.fromValue = [NSValue valueWithCGPoint:imageView.layer.position];
positionAnimation.toValue = [NSValue valueWithCGPoint:centerPointofView];
positionAnimation.duration = 2.0;
positionAnimation.fillMode = kCAFillModeForwards;
positionAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
positionAnimation.removedOnCompletion = NO;
positionAnimation.delegate = self;
[imageView.layer addAnimation:positionAnimation forKey:#"positionAnimation"];
// For Scale After image is in center copy below code
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag{
CAAnimation *animation = [imageView.layer animationForKey:#"positionAnimation"];
if (animation == theAnimation)
{
CABasicAnimation* scaleAnimation;
scaleAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale"];
scaleAnimation.fromValue = [NSNumber numberWithFloat:1];
scaleAnimation.toValue = [NSNumber numberWithFloat:4.0];
scaleAnimation.duration = 2.2;
scaleAnimation.fillMode = kCAFillModeForwards;
scaleAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
scaleAnimation.removedOnCompletion = NO;
scaleAnimation.delegate = self;
[imageView.layer addAnimation:scaleAnimation forKey:#"scaleAnimation"];
}
else
{
//if you want changes to image should remain forever
//place your code for scale & transform here
....................
//now simple remove animation from layer
[imageView.layer removeAllAnimations];
}
}
Cant you use
[UIView animateWithDuration:2.0
animations:^{
//animations
}
completion:^(BOOL finished){
// completion methods
}];