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 an iPhone/iPad app, and I am currently trying to have an image spin slowly 360 degrees. But when I increase the animation duration, the picture rotates 1/4 of the way and then resets back to the beginning of the animation.
Can anyone tell me what is wrong with this?
What I have so far:
CABasicAnimation *fullRotation = [CABasicAnimation animationWithKeyPath:#"transform.rotation"];
[fullRotation setFromValue:[NSNumber numberWithFloat:0]];
[fullRotation setToValue:[NSNumber numberWithFloat:((2*M_PI))]];
fullRotation.speed = .5f;
fullRotation.duration = 5.5;
fullRotation.repeatCount = 1;
fullRotation.repeatCount = HUGE_VALF;
[[cosmic layer] addAnimation:fullRotation forKey:#"transform.rotation"];
Just delete this one line from your code:
fullRotation.speed = .5f;
and then adjust duration you want.
Any idea why the small image that I move across the screen gets blurry?
While being in motion, the small details in the image become unclear and I think that it is a problem.
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:#"position"];
anim.fromValue = [NSValue valueWithCGPoint:CGPointMake(px2.x, px2.y)];
anim.toValue = [NSValue valueWithCGPoint:CGPointMake(P3x, P3y)];
anim.duration = 1.5f;
anim.repeatCount =1;
anim.removedOnCompletion = YES;
anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[LA addAnimation:anim forKey:#"position"];
Eventually this was identified as LCD panel lag.
I have this simple animation that moves an image from one point to another:
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:#"position"];
anim.fromValue = [NSValue valueWithCGPoint:CGPointMake(px2.x, px2.y)];
anim.toValue = [NSValue valueWithCGPoint:CGPointMake(P3x, P3y)];
anim.duration = 1.5f;
anim.repeatCount =1;
anim.removedOnCompletion = YES;
anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
[LA addAnimation:anim forKey:#"positionTest"];
The problem is that the image becomes blurry while in motion, the motion is not very fast.
Is there a way to reduce this motion blur?
If you take a screenshot during the animation is it definitely blurred? Also is the blurring a pixellated blur or is it more like a soft gaussian blur?
Try setting view.layer.shouldRasterize = yes and layer.rasterizationScale = UIScreen.mainScreen.scale;
Hey, I have this code snippet (duration is .5, amount is 1.5)
CABasicAnimation *grow = [CABasicAnimation animationWithKeyPath:#"transform"];
grow.duration = duration;
grow.repeatCount = 0;
grow.removedOnCompletion = NO;
grow.autoreverses = NO;
grow.fromValue = [NSValue valueWithCATransform3D:CATransform3DScale(self.layer.transform, 1.0, 1.0, 1.0)];
grow.toValue = [NSValue valueWithCATransform3D:CATransform3DScale(self.layer.transform, amount, amount, amount)];
grow.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[self.layer addAnimation:grow forKey:#"grow"];
However when this is played, the UIView grows properly, but then snaps back to its starting value. I thought the "removedOnCompletion" was supposed to prevent this?
Looks like I also needed to specify:
grow.fillMode = kCAFillModeForwards;
Go figure. Works now :)