I have an image which is rotating and what I want is that a second image to be stuck on it and it rotate just as the first. Please, how can I do this?
I'm not at my computer so I can't test this, but I think it should get you what you want.
// assuming you already have your views
// viewOne, viewTwo
[viewOne addSubview:viewTwo]; // add viewTwo to viewOne
// let's assume that you call this code here one time per second
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
// when this is 1.0, the image will rotate 360
// ... when it is .5, it should rotate 180, etc...
float rotationFactor = 0.1f;
// viewTwo's rotationFactor will be added to view 1's in the transform below
float rotationFactor2 = 0.1f;
viewOne.transform = CGAffineTransformMakeRotation(M_PI_2 * rotationFactor);
viewTwo.transform = CGAffineTransformMakeRotation(M_PI_2 * (rotationFactor + rotationFactor2);
[UIView commitAnimations];
Related
I walked over other same question but it didn't help.
I have an image that should rotate every doubleTap by 90 degrees
This is the rotation function
-(void) rotateImageWithAngle:(float)angle1
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.2];
[UIView setAnimationBeginsFromCurrentState:YES];
CGAffineTransform transform;
transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(angle1));
self.transform = transform;
[UIView commitAnimations];
}
angel1 is always 90.
The problem is that it rotates only once, every additional doubleTap goes to the function but does nothing.
Thanks
You're applying the same transform every time. You should change the angle by 90 degrees with each double tap.
I am doing a scale and translate animation using the code below. This moves an image from bottom left to center of screen. Next time when I do animation I want to restart from bottom left. But the animation doesn't start. What do I need to restart the animation ?
// Setup the animation
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:duration];
[UIView setAnimationCurve:curve];
[UIView setAnimationBeginsFromCurrentState:YES];
// The transform matrix
CGAffineTransform transform = CGAffineTransformMakeTranslation(x, y);
CGAffineTransform scale = CGAffineTransformMakeScale(2.0,2.0);
CGAffineTransform scale_transform = CGAffineTransformConcat(transform,scale);
image.transform = scale_transform;
[UIView commitAnimations];
I found out. This is what solved it.
image.transform = CGAffineTransformIdentity
I'd like to have an image in my iphone app "pop-in" on screen rather than just appearing. By "pop-in" I mean that it would grow from a small dot to its actual size. For reference, this is exactly the same as the "pop" animation effect in Keynote.
I'm completely new to iOS animations, so if someone could point me in the direction on the animation effects I would need to use, it would be greatly appreciated.
Thanks
Brian
UPDATE
I've added this code from the suggestions below. This works but it scales my image down, rather than up. I know that is because I have 0.01 as the transform scale size, but I would like to know how I can start out with an image of size 0.0 and scale up to 1. Is it just a matter to setting the size of my image to 0?
Thanks
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration: 0.2];
image.transform = CGAffineTransformMakeScale(0.01, 0.01);
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
The effect you’re looking for is something like this:
// instantaneously make the image view small (scaled to 1% of its actual size)
view.transform = CGAffineTransformMakeScale(0.01, 0.01);
[UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
// animate it to the identity transform (100% scale)
view.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished){
// if you want to do something once the animation finishes, put it here
}];
if you want something like Facebook does on liking any post then use this
-(void)animateButton:(UIButton *)sender{
UIButton * btn = (UIButton *)sender;
[UIView animateWithDuration:0.3/1.5 animations:^{
btn.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.4, 1.4); // scales up the view of button
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3/2 animations:^{
btn.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.7, 0.7);// scales down the view of button
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3/2 animations:^{
btn.transform = CGAffineTransformIdentity; // at the end sets the original identity of the button
}];
}];
}];}
just call this method when you want to animate the view
if you have text and image on the button and you just want to animate the image of the button then just replace "btn" with "btn.imageView" , this will just produce animation on the image view property of the button.
Hope it helps
All the best.
You have to animate the frame of the view, to shrink it from zero to the final state.
This can be done for example with UIView block animation.
So for example start with your view as an IBOutlet property self.myView with the final size and position, but set the hidden flag.
Then when you want it to appear use the following:
// Save old frame as final stater and set it to zero size for the start of the animation
// But keep the same center position, so it just grows and don't move around
CGRect oldFrame = self.myView.frame;
CGRect oldCenter = self.myView.center;
self.myView.frame = CGRectZero;
self.myView.center = oldCenter;
self.myView.hidden = NO;
NSTimeInterval duration = 0.3;
[UIView animateWithDuration:duration delay:0.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
// New position and size after the animation should be the same as in Interface Builder
self.myView.frame = oldFrame
}
completion:^(BOOL finished){
// You can do some stuff here after the animation finished
}];
Swift 2.0 version
view.transform = CGAffineTransformMakeScale(0.01, 0.01);
UIView.animateWithDuration(0.2, delay: 0, options: .CurveEaseOut, animations: { () -> Void in
// animate it to the identity transform (100% scale)
self.view.transform = CGAffineTransformIdentity;
}) { (finished) -> Void in
// if you want to do something once the animation finishes, put it here
}
For that you will have to use a simple UIView
Add the UIview to your current view.
- (void) initPopUpView
{
popup.alpha = 0;
popup.frame = CGRectMake (160, 240, 0, 0);
[self.view addSubview:popup];
}
- (void) animatePopUpShow
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationDelegate:self];
[UIView setAnimationWillStartSelector:#selector(initPopUpView)];
popup.alpha = 1;
popup.frame = CGRectMake (20, 40, 300, 400);
[UIView commitAnimations];
}
I'm trying to create a flip-and-scale animation between two view controllers. This seems possible using animation blocks available in iOS 4.0, but I'm still unsure how to implement it. I found this SO question which shows a flip animation.
Using this code, flipping between two views works fine, but scaling doesn't -- the flip animation completes and then the new view jumps to the correct size. How would I flip the view and scale it at the same time?
UIView *tempContainer = myView.contentView ;
[UIView transitionWithView:tempContainer
duration:2
options:UIViewAnimationOptionTransitionFlipFromRight
animations:^{
[[[tempContainer subviews] objectAtIndex:0] removeFromSuperview];
[tempContainer addSubview:myOtherViewController.view];
CGAffineTransform transform = CGAffineTransformMakeScale(4.0, 4.0);
tempContainer.transform = transform;
}
completion:^(BOOL finished){
[tempContainer release];
}];
I suppose this happens because the option UIViewAnimationOptionTransitionFlipFromRight somehow overrides everything else. Try using nesting animations or link them together
Here's how I flip and scale between two views of different sizes. I break the animation into a few parts. First I put the back view at the same location as the front view, but make it hidden. I then flip and scale the front view halfway. The back view is given the same transform as the front view, then rotated and scaled the rest of the way. Flipping back is basically the reverse.
I suppose you could use a different view controllers view property as the back view, but I haven't tried that.
// flip and scale frontView to reveal backView to the center of the screen
// uses a containerView to mark the end of the animation
// parameterizing the destination is an exercise for the reader
- (void)flipFromFront:(UIView*)frontView toBack:(UIView*)backView destination:(CGRect)destRect
{
float duration = 0.5;
// distance from center of screen from frontView
float dx = destRect.origin.x + CGRectGetWidth(destRect) / 2 - frontView.center.x;
float dy = destRect.origin.y + CGRectGetHeight(destRect) / 2 - frontView.center.y;
float scale = CGRectGetWidth(destRect) / CGRectGetWidth(frontView.bounds);
// this prevents any tearing
backView.layer.zPosition = 200.0;
// hide the backView and position where frontView is
backView.hidden = NO;
backView.alpha = 0.0;
backView.frame = frontView.frame;
// start the animation
[UIView animateKeyframesWithDuration:duration
delay:0.25
options:UIViewKeyframeAnimationOptionCalculationModeCubic
animations:^{
// part 1. Rotate and scale frontView halfWay.
[UIView addKeyframeWithRelativeStartTime:0.0
relativeDuration:0.5
animations:^{
// get the transform for the blue layer
CATransform3D xform = frontView.layer.transform;
// translate half way
xform = CATransform3DTranslate(xform, dx/2, dy/2, 0);
// rotate half way
xform = CATransform3DRotate(xform, M_PI_2, 0, 1, 0);
// scale half way
xform = CATransform3DScale(xform, scale/2, scale/2, 1);
// apply the transform
frontView.layer.transform = xform;
}];
// part 2. set the backView transform to frontView so they are in the same
// position.
[UIView addKeyframeWithRelativeStartTime:0.5
relativeDuration:0.0
animations:^{
backView.layer.transform = frontView.layer.transform;
backView.alpha = 1.0;
}];
// part 3. rotate and scale backView into center of container
[UIView addKeyframeWithRelativeStartTime:0.5
relativeDuration:0.5
animations:^{
// undo previous transforms with animation
backView.layer.transform = CATransform3DIdentity;
// animate backView into new location
backView.frame = destRect;
}];
} completion:^(BOOL finished) {
self.displayingFront = !self.displayingFront;
}];
}
// flip from back to front
- (void) flipFromBack:(UIView*)backView toFront:(UIView*)frontView
{
float duration = 0.5;
// get distance from center of screen to destination
float dx = backView.center.x - frontView.center.x;
float dy = backView.center.y - frontView.center.y;
backView.layer.zPosition = 200.0;
frontView.hidden = YES;
// this is basically the reverse of the previous animation
[UIView animateKeyframesWithDuration:duration
delay:0
options:UIViewKeyframeAnimationOptionCalculationModeCubic
animations:^{
[UIView addKeyframeWithRelativeStartTime:0.0
relativeDuration:0.5
animations:^{
CATransform3D xform = backView.layer.transform;
xform = CATransform3DTranslate(xform, -dx/2, -dy/2, 0);
xform = CATransform3DRotate(xform, M_PI_2, 0, 1, 0);
xform = CATransform3DScale(xform, 0.75, 0.75, 1);
backView.layer.transform = xform;
}];
[UIView addKeyframeWithRelativeStartTime:0.5
relativeDuration:0.0
animations:^{
backView.alpha = 0.0;
frontView.hidden = NO;
}];
[UIView addKeyframeWithRelativeStartTime:0.5
relativeDuration:0.5
animations:^{
self.hiddenView.alpha = 0.0;
frontView.layer.transform = CATransform3DIdentity;
}];
} completion:^(BOOL finished) {
self.displayingFront = !self.displayingFront;
}];
}
I want to create an animation that moves and rotates a UIView at the same time. I tried the following code:
[UIView beginAnimations:#"MoveAndRotateAnimation" context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:kAnimationDuration];
myView.frame = newFrame;
myView.transform = CGAffineTransformMakeRotation(0.4);
[UIView commitAnimations];
The result is, that after the animation has finished the view is drawn incorrectly (some parts are not visible anymore). If I only change the frame OR the transformation for the animation, the view draws correctly. The problem only occurs if I set both the frame and transformation.
What would be the correct way to animate moving and rotating of a view at the same time?
You can't use frame, bounds, or center if you are also animating things like rotation. You need to use CGAffineTransforms for everything and concatenate them together. Like so:
CGAffineTransform transform = CGAffineTransformMakeTranslation(100,100);
transform = CGAffineTransformRotate(transform, 0.4);
[UIView beginAnimations:#"MoveAndRotateAnimation" context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:kAnimationDuration];
myView.transform = transform;
[UIView commitAnimations];
Try doing it this way: (Moving left and rotating, just for example)
[UIView beginAnimations:#"MoveAndRotateAnimation" context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:kAnimationDuration];
CGPoint center = CGPointMake(-200, self.view.center.y);
self.view.transform = CGAffineTransformMakeRotation(-0.5);
self.view.center = center;
[UIView commitAnimations];
The center point locations would be the point you wish to make the view move, of course.
The problem is probably with your new frame size as compared to original frame size. View frame is a bit tricky when you rotate a frame:
Frame is in superviews coordinate system. So, when you rotate a rectangle, the new frame will be the smallest rectangle in superview's coordinate system which contains the view.
e.g. if you have a square view with frame size of (100*100) and rotate it by 45 degrees your new frame would have a size of (141*141) and if you set the frame to have a size of (100*100) you'll cut part of your view.
Look at here for better understanding of how view frame works.
You need to do this:
#pragma mark (Woblling animation)
CGAffineTransform leftWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-10.0));
CGAffineTransform rightWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(10.0));
self.view .transform = leftWobble; // starting point
[UIView beginAnimations:#"wobble" context:self.view ];
[UIView setAnimationRepeatAutoreverses:YES]; // important
[UIView setAnimationRepeatCount:11];
[UIView setAnimationDuration:1.00];
//[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(wobbleEnded:finished:context:)];//should be same as written
self.view .transform = rightWobble; // end here & auto-reverse
[UIView commitAnimations];
and then implement these methods. They are necessary to keep your view in the same position after rotation.
- (void) wobbleEnded:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
if ([finished boolValue]) {
UIView* item = (UIView *)context;
item.transform = CGAffineTransformIdentity;
}
}
Use this method if you are using navigation and when you navigate from one view to another, then your view would be at the same place.else leave this method:
- (void)viewWillAppear:(BOOL)animated
{
UIView* item = self.view;
item.transform = CGAffineTransformIdentity;
}
I had the same problem but did some experiments and came up with this solution.