I have a UIView subclass which I am able to successfully use UIView animations on.
This UIView also has subviews, which I also want to be able to UIView animate.
However, it seems that whenever I create an animation and apply it to the parent view it works fine, but if I apply the animation to the child view it animates backwards.
For example, if I scale my UIView parent(self) by a factor of 2 (to double the width and height):
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDelegate: self];
[UIView setAnimationDuration:2];
[UIView setAnimationDelay:2];
CGAffineTransform scaleTransform = CGAffineTransformScale( self.transform, 2, 2 );
self.transform = scaleTransform;
[UIView commitAnimations];
then this works fine.
But if I do the same on the child:
UIView *myObj = [[self subviews] objectAtIndex:0];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDelegate: self];
[UIView setAnimationDuration:2];
[UIView setAnimationDelay:2];
CGAffineTransform scaleTransform = CGAffineTransformScale( myObj.transform, 2, 2 );
myObj.transform = scaleTransform;
[UIView commitAnimations];
It doesn't work. What happens visually is that the child view immediately shrinks down and then after the delay scales back up to it's original size.
If I log the transform parameters it looks the same for both parent and child and I have tried setting CGAffineTransformIdentity.
Any ideas what might be the problem?
I was overriding layoutSubviews and in there I was assigning sizes/positions of the views based upon device orientation which was conflicting.doh!
Related
I am developing iOS game and need custom animation so I am using this method
CGRect basketTopFrame = mainScreenView.frame;
basketTopFrame.origin.x = 320;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelay:.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
mainScreenView.frame = basketTopFrame;
[UIView commitAnimations];
in the .h file I have declared mainScreen like this
IBOutlet UIView *mainScreenView;
So in the IB I have put UIView in the view in the interface and hooked it up with mainScreenView
So in the mainViewScreen the view sometimes shows up sometimes doesn't (works on the 2nd try) however when I remove the animation code it works perfectly fine..I don't know what is happening any help would be appreciated thanks
edit
this is how I added the view
MainScreen *mainScreen = [[MainScreen alloc]initWithNibName:#"MainScreen" bundle:nil];
[mainScreenView addSubview:mainScreen.view];
I tried it in a sandbox project, and this worked for me:
- (IBAction)buttonTouched:(id)sender {
myView.transform = CGAffineTransformMakeTranslation(-320, 0);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelay:.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
myView.transform = CGAffineTransformMakeTranslation(0,0);
[UIView commitAnimations];
}
Looks like you are trying to move something off screen. An easier way is to do this
[UIView beginAnimations:#"UIBase Hide" context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelay:.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
mainScreenView.transform = CGAffineTransformMakeTranslation(320,0); //slide view to the right.
[UIView commitAnimations];
note: using 320 on the Translation wont move the view to the 320th pixel of the screen rather it moves your view 320px to the right. So if your mainScreenView is at origin.x = 100. After this translation it is now at 420.
To move it back do
self.transform = CGAffineTransformIdentity;
I created a UIImageView that has a custom shadowPath. This view will be moved left and right across the screen, but I need the shadowPath to have a different transformation than the image layer itself. Is this possible? Moving the image itself works, and the shadow moves as well when I do the following:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
im.center = location;
[UIView commitAnimations];
But if I try to add a layer transformation before "commitAnimations", the shadow will simply take on that property right away, for example:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
im.center = location;
im.layer.shadowPath = [self createPerspectiveShadow:im]; //this will not animate
[UIView commitAnimations];
So, my question is, is there a way to recalculate a shadow during the animation?
Thanks
The UIView animations don’t always allow you to animate CALayer attributes; try using a CABasicAnimation instead.
You can pass a CGPathREf to the toValue
theAnimation.toValue = (id)[UIBezierPath bezierPathWithRect:newRect].CGPath;
see this post
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.
how can I implement the animation we see in the iPhone Music app's coverflow screen? when you click on a small view, it flips and scales up to another view? how can I do this? I can use core animation to flip and scale a view, but how can I do the transition to another view? thanks
You need an UIView as Container for the two UIViews (frontside/backside) and then remove/add these from/to the container as subviews while doing the animations in between:
UIView *flipContainer;
UIView *frontSide;
UIView *backSide;
//...
-(void)turnUp
{
[backSide removeFromSuperview];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:flipContainer cache:YES];
[UIView setAnimationDuration:1.0];
CGAffineTransform transform = CGAffineTransformMakeScale(1.2, 1.2);
flipContainer.transform = transform;
[UIView commitAnimations];
[flipContainer addSubview:frontSide];
}
-(void)turnDown
{
[frontSide removeFromSuperview];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:flipContainer cache:YES];
[UIView setAnimationDuration:1.0];
CGAffineTransform transform = CGAffineTransformMakeScale(1, 1);
flipContainer.transform = transform;
[UIView commitAnimations];
[flipContainer addSubview:backSide];
}
I'm trying the exact code you are doing - I get a zoom effect but no turn over. The only difference is that right before the turnUp code I add the flipContainer (with back showing) so then it can be flipped over.
// construct animation container
self.flipContainer = [[FlipContainer alloc] init];
[self.flipContainer.view setFrame:CGRectMake(clickedSquareX, clickedSquareY, 200, 200)];
[self.flipContainer.view addSubview:self.backside.view];
// add animation container
[self.myParentView.view addSubview:self.flipContainer.view];
// PROCEED to your turnUp code
The reason I'm doing this is I have a bunch of images in a horizontal UIScrollView and so to 'simulate' a 200x200 image flipping over and zooming to show detail I add my flipContainer with the backside showing the exact image over the exact spot of the pressed image. It should work shouldn't it? A bit confusing to me is the first line of your turnUp code you do:
[backSide removeFromSuperview];
..which would remove the view I just added.
I'm not sure if this is the right spot to put this question in - sorry if it isn't!
On the Mac, the best way for a simple cross-fade transition of views (without any custom keyframe timing) is to do something such as the following excerpt:
[[self animator] replaceSubview:aView with:bView];
Unfortunately the animator property isn't available on the iPhone. What's the best bet of doing this on the iPhone? Is it setting alpha channels on each view? Sample code would be excellent.
Thanks.
The basic way to animate views on the iphone is to use the UIView beginAnimations and commitAnimations calls. They allow you to modify the animatable properties of a view and have those changes animated.
For instance I have a custom view that is hidden and shown using this approach:
- (void) showAView:(CustomAView *)aView
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
aView.frame = CGRectMake(0.0f, 110.0f , aView.frame.size.width, aView.frame.size.height);
[UIView commitAnimations];
}
- (void) hideAView:(CustomAView *)aView
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
aView.frame = CGRectMake(0.0f, self.view.frame.size.height, aView.frame.size.width, aView.frame.size.height);
[UIView commitAnimations];
}
By wrapping the frame property change in the UIView beginAnimations/commitAnimations the change has a standard animation applied to it.
You can add additional properties to the animation by using UIView animation class methods eg.
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];