i face trouble to apply pendulum animation base gravity effect on my UIImageView. can any buddy help me to come out from this trouble??
i have tried below source code. but in that gravitational force is not apply.
- (void)swingPendulum {
pendulum.layer.anchorPoint = CGPointMake(0.5,0);
[pendulum.layer setTransform:CATransform3DMakeRotation(-M_PI*3/4, 0, 0, 1)];
CABasicAnimation *needleAnim = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
needleAnim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
needleAnim.duration = 1;
needleAnim.repeatCount = 5;
needleAnim.autoreverses = YES;
// Setting fillMode means that, once the animation finishes, the needle stays in its end position.
needleAnim.fillMode = kCAFillModeForwards;
needleAnim.removedOnCompletion = YES;
needleAnim.toValue = [NSNumber numberWithFloat:M_PI*3/4];
[pendulum.layer addAnimation:needleAnim forKey:nil];
}
actually we need animation like...
check out this : http://blog.ruben-martins.co.uk/2010/02/maya-tutorials-pendulum-animation.html
Thanks in Advance.
If you've got an image with a blank top section and starts in the middle and just want to rotate it (haven't tried it tho):
-(void) doAnimation {
imgView.transform = CGAffineTransformMakeRotation(-0.7);
[UIView animateWithDuration:4 delay:0 options:UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionAutoreverse animations:^{
imgView.transform = CGAffineTransformMakeRotation(0.7);
} completion:^{
[self doAnimation];
}]
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 need a view to enter the screen with oscillating animation and finally, the animation should stop in a natural way (decreasing oscillations - pendulum effect). I have added the subview above the screen so that the view rotates into the screen when required. The code for adding the subview is:
myView.layer.anchorPoint = CGPointMake(1.0, 0.0);
[[self view] addSubview:myView];
[myView setHidden:YES];
// Rotate 75 degrees to hide it off screen
CGAffineTransform rotationTransform = CGAffineTransformIdentity;
rotationTransform = CGAffineTransformRotate(rotationTransform, DEGREES_RADIANS(75));
bannerView.transform = rotationTransform;
bannerView.center = CGPointMake(((self.view.bounds.size.width)/2.0), -5.0);
[self performSelector:#selector(animateSwing) withObject:nil afterDelay:3.0];
The way I'm trying to achieve this that the view should rotate one full semi circle & back rotation, then rotate one semi circle rotation and finally come to halt at desired point using EaseOut animation curve. The code for my animateSwing() method is given below:
- (void)animateSwing {
NSLog(#"ANIMATING");
[myView setHidden:NO];
CGAffineTransform swingTransform = CGAffineTransformIdentity;
swingTransform = CGAffineTransformRotate(swingTransform, DEGREES_RADIANS(-20));
[UIView animateWithDuration:0.30
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
[UIView setAnimationRepeatCount:1.5];
[UIView setAnimationRepeatAutoreverses:YES];
myView.transform = swingTransform;
}completion:^(BOOL finished){
[UIView animateWithDuration:0.10
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
myView.transform = CGAffineTransformMakeRotation(DEGREES_RADIANS(0));
}completion:^(BOOL Finished){
}];
}];
}
For some reason the above code isn't working. If I do not chain animations, the code performs the semi-circle routine. But if I chain animations like above, it just oscillates a little bit around the desired point and ends abruptly.
Please suggest a fix to this code OR suggest a way to implement the required animation
Thanks
You want to use a keyframe animation. I actually have an example of a "decreasing waggle" animation in my book (http://www.apeth.com/iOSBook/ch17.html#_keyframe_animation):
CompassLayer* c = (CompassLayer*)self.compass.layer;
NSMutableArray* values = [NSMutableArray array];
[values addObject: #0.0f];
int direction = 1;
for (int i = 20; i < 60; i += 5, direction *= -1) { // alternate directions
[values addObject: #(direction*M_PI/(float)i)];
}
[values addObject: #0.0f];
CAKeyframeAnimation* anim =
[CAKeyframeAnimation animationWithKeyPath:#"transform"];
anim.values = values;
anim.additive = YES;
anim.valueFunction =
[CAValueFunction functionWithName: kCAValueFunctionRotateZ];
[c.arrow addAnimation:anim forKey:nil];
Of course that isn't identical to what you're trying to do, but it should get you started.
how the button can be rotated by 360 degree for duration of time 30 sec and after that the button stop rotation.
A 360 rotation animation is only a few lines of code with Core Animation.
CABasicAnimation *rotate =
[CABasicAnimation animationWithKeyPath:#"transform.rotation"];
rotate.byValue = #(M_PI*2); // Change to - angle for counter clockwise rotation
rotate.duration = 30.0;
[yourButton.layer addAnimation:rotate
forKey:#"myRotationAnimation"];
By using the byValue property you are doing a relative rotation of 360 degrees to whatever rotation was there before (compared to explicitly specifying the from and to values). This means that the above code will rotate the button 360 degrees even if it is already rotated. All the answers that explicitly specify an end transform are assuming that the button isn't already rotated.
The above example is as small as possible to do just what you asked for ("be rotated by 360 degree for duration of time 30 sec"). If you want to have more control you can optionally make the animation start and/or stop slowly by specifying a timing function
rotate.timingFunction =
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
If you haven't already added QuarzCore.framework to your project you will need to do so. Also #import <QuartzCore/QuartzCore.h> in the top of your source file.
CATransform3D myRotationTransform = CATransform3DRotate(Yourbutton.layer.transform, -1, 0.0, 0.0, 1.0);
Yourbutton.layer.transform = myRotationTransform;
CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:#"transform.rotation.z"];
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat: -1];
animation.duration = 30;
animation.repeatCount = 1;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[Yourbutton.layer addAnimation:animation forKey:#"MyAnimation"];
Should work as needed! don't forget to include quartz.framework!
Well I just used
Being self.buttonImageView the ImageView you need to rotate.
[UIView animateKeyframesWithDuration:0.5 delay:0 options:UIViewKeyframeAnimationOptionCalculationModeLinear animations:^{
[UIView addKeyframeWithRelativeStartTime:0.0 relativeDuration:0.25 animations:^{
self.buttonImageView.transform= CGAffineTransformMakeRotation(M_PI);
}];
[UIView addKeyframeWithRelativeStartTime:0.5 relativeDuration:0.25 animations:^{
self.buttonImageView.transform= CGAffineTransformMakeRotation(-2* M_PI);
}];
} completion:^(BOOL finished) {
[self.map setCenterCoordinate:self.map.userLocation.location.coordinate animated:YES];
self.buttonImageView.transform= CGAffineTransformMakeRotation(2* M_PI);
}];
[UIView animateWithDuration:.30f animations:^{
btnGallery.transform = CGAffineTransformRotate(CGAffineTransformIdentity, -M_PI);
}];
I'm rotating an arrow by 45 degrees. When an animation ends, the arrow returns to its original state (0 degrees). I need that the arrow doesn't return to original state and it will be rotate by 45 degrees at the end of animation.
CABasicAnimation *fullRotationShort = [CABasicAnimation animationWithKeyPath:#"transform.rotation"];
fullRotationShort.fromValue = [NSNumber numberWithFloat:0];
fullRotationShort.toValue = [NSNumber numberWithFloat:M_PI/28*4.7];
fullRotationShort.duration = 1.0f;
fullRotationShort.repeatCount = 1;
[imgViewArrowShort.layer addAnimation:fullRotationShort forKey:nil];
Assuming your arrow is a UIImageView named arrow.
You really don't need such complicated CAAnimations for this.
[UIView animateWithDuration:1.0 animations:^{
arrow.transform = CGAffineTransformMakeRotation(0.25 * M_PI);
}];
Set the property:
fullRotationShort.fillMode = kCAFillModeForwards;
fullRotationShort.cumulative = YES;
fullRotationShort.removedOnCompletion=NO;
I'd like to "Stretch" a UIView to the right side, meaning increase it's frame.size.width by foo pixels and at the same time decreasing it's frame.origin.x by foo pixels, using [UIView beginAnimations] syntax.
However, if I do that, when the animation begins the view immediately resizes, and then starts the animation for the origin.
CGRect currFrame = someView.frame;
currFrame.size.width += 100;
currFrame.origin.x -= 100;
[UIView beginAnimations:#"Anim1" context:nil];
someView.frame = currFrame;
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
I've also tried breaking the animation down to 2 parts but then I can't keep the right position in place.
Any help is much appreciated!
You might need to drop down to Core Animation and break this into two explicit animations:
CABasicAnimation *stetchAnimation = [CABasicAnimation animationWithKeyPath:#"transform.scale.x"];
stetchAnimation.toValue = [NSNumber numberWithDouble:(someView.frame.size.width+100)/someView.frame.size.width];
CABasicAnimation *slideAnimation = [CABasicAnimation animationWithKeyPath:#"transform.translation.x"];
slideAnimation.toValue = [NSNumber numberWithDouble:-100];
CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.animations = [NSArray arrayWithObjects:stetchAnimation,slideAnimation,nil];
animationGroup.removedOnCompletion = NO;
animationGroup.fillMode = kCAFillModeForwards;
animationGroup.duration = 0.7;
[someView.layer addAnimation:animationGroup forKey:#"animations"];