I have multiple animate-able/interactive UIImageViews on my UIView which would animate/interact based on user touches. I am trying to add a feature which would "wiggle" these animate-able/interactive UIImageViews on touch of an Icon which would help user in identifying which objects are interactive on screen. I am trying to use following code to achieve "wiggle" movement from this blog:
-(void)doWiggle:(UIView *)touchView {
// grabbing the layer of the tocuhed view.
CALayer *touchedLayer = [touchView layer];
// here is an example wiggle
CABasicAnimation *wiggle = [CABasicAnimation animationWithKeyPath:#"transform"];
wiggle.duration = 0.1;
wiggle.repeatCount = 1e100f;
wiggle.autoreverses = YES;
wiggle.toValue = [NSValue valueWithCATransform3D:CATransform3DRotate(touchedLayer.transform,0.1, 0.0 ,1.0 ,1.0)];
// doing the wiggle
[touchedLayer addAnimation:wiggle forKey:#"wiggle"];
// setting a timer to remove the layer
[NSTimer scheduledTimerWithTimeInterval: 2.0 target:self selector:#selector(endWiggle:) userInfo:touchedLayer repeats:NO];
}
-(void)endWiggle:(NSTimer*)wiggleTimer {
// stopping the wiggle now
[((CALayer*)wiggleTimer.userInfo) removeAllAnimations];
}
I call it like this in my routine :[self doWiggle:imageAnimation]; where imageAnimation is an UIImageView. I see that while wiggling, half of the image is disappearing. I read somewhere that I need to set the z-index properly in order for this to work. What do I need to set for z-index? and I have 3 to 4 UIImageViews per page where I need to call doWiggle: routine, do I need to fix z-indexes of all those UIImageViews?
Before you call doWiggle, you may need to do this code:
[[touchView superview] bringSubviewToFront:touchView];
If you can see the entire view before doing the animation then this will probably not fix your problem. It is possible that your image is being scaled by the image view and that is causing a problem during the animation. You may need to rescale your image, with an image editing program, to fit inside the view without having the view scale it. You can also do this programmatically, if you don't have a static image (i.e. loading off the network, etc).
Related
I'm writing an app with a series of cards in a table view, similar to the layout of the Google app for iOS when Google Now cards are enabled. When the user taps on a card, there should be a custom transition to a new view controller which is basically the card looking bigger, almost filling the screen, and it has more details on it. The custom transition itself should look like the card is animated upward and growing in size until it reaches its final size and position, which is now the new view controller holding the card.
I have been trying to approach this using a custom view controller transition. When the card is tapped, I initiate a custom view controller transition with UIModalPresentationCustom, and I set a transition delegate, which itself vends a custom animator and a custom UIPresentationController. In animateTransition:, I add the new view controller's view into the container view, setting the frame to the card's frame initially (so it looks like the card is still there and unchanged). Then I attempt to perform an animation where the presented view's frame grows in size and changes in position so that it moves into its final position.
Here's some of my code which does what I've described above - I'm trying to keep it short and sweet, but I can provide more info if needed:
Transition Delegate
-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
// NOWAnimationDelegate is my own custom protocol which defines the method for asking the presenting VC for the tapped card's frame.
UIViewController<NOWAnimationDelegate> *fromVC = (UIViewController<NOWAnimationDelegate> *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *finalVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
// Ask the presenting view controller for the frame of the tapped card - this method works.
toView.frame = [fromVC rectForSelectedCard];
[transitionContext.containerView addSubview:toView];
CGRect finalRect = [transitionContext finalFrameForViewController:finalVC];
[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
toView.frame = finalRect;
}completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
}];
}
Custom UIPresentationController
-(CGSize)sizeForChildContentContainer:(id<UIContentContainer>)container withParentContainerSize:(CGSize)parentSize {
return CGSizeMake(0.875*parentSize.width, 0.875*parentSize.height);
}
-(CGRect)frameOfPresentedViewInContainerView {
CGRect presentedViewFrame = CGRectZero;
CGRect containerBounds = self.containerView.bounds;
presentedViewFrame.size = [self sizeForChildContentContainer:(UIView<UIContentContainer> *)self.presentedView withParentContainerSize:containerBounds.size];
presentedViewFrame.origin.x = (containerBounds.size.width - presentedViewFrame.size.width)/2;
presentedViewFrame.origin.y = (containerBounds.size.height - presentedViewFrame.size.height)/2 + 10;
return presentedViewFrame;
}
What I'm finding is happening is that the new view is being automatically set to its final size immediately at the start of the animation, and then the animation is just the new view animating upwards. Using breakpoints, I'm noticing that frameOfPresentedViewInContainerView is called during the [transitionContext.containerView addSubview:toView] call, which would probably explain why this is happening - frameOfPresentedViewInContainerView returns "The frame rectangle to assign to the presented view at the end of the animations" according to the UIPresentationController documentation.
However, I'm not sure how to proceed, or if it's even really possible. All the examples of custom view controller transitions I've seen have all had the final size of the presented view controller static and unchanging during the animation. Is there any way to perform a custom view controller transition with a changing size of the presented view during the animation, or do I have to approach this in a different way?
Basically what you need to do is animating your toView.transform using CGAffineTransform in your Transition Delegate. Steps to do:
Before animating set your toView.frame = your frame when it's not showing
Create, let's say, CGAffineTransformMakeScale to scale from hidden frame to your desired final presented frame
On animation block set toView.transform to the transform that you create on step 2
As Aditya mentions CGAffineTransform is the way to go here.
Ive got this working now with it maintaining the width:
CGFloat targetscale=initialHeight/finalHeight;
CGFloat targetyoffset=(finalHeight-(finalHeight*targetscale))/2;
int targety=roundf(initialPosition-targetyoffset);
CGAffineTransform move=CGAffineTransformMakeTranslation(0, targety);
CGAffineTransform scale=CGAffineTransformMakeScale(1,targetscale);
toView.transform=CGAffineTransformConcat(scale,move);
This positions the incoming view taking into account the determined scale and then performs both transforms concurrently so the view scales & moves to the final position and size.
You then just set
toView.transform=CGAffineTransformIdentity;
in the animation block and it'll scale to the final location and size.
Note, this only moves and scales in the vertical dimension but can be adapted to scale in all directions like so:
+(CGAffineTransform)transformView:(UIView*)view toTargetRect:(CGRect)rect{
CGFloat targetscale=rect.size.height/view.frame.size.height;
CGFloat targetxoffset=(view.frame.size.width-(view.frame.size.width*targetscale))/2;
int targetx=roundf(rect.origin.x-view.frame.origin.x-targetxoffset);
CGFloat targetyoffset=(view.frame.size.height-(view.frame.size.height*targetscale))/2;
int targety=roundf(rect.origin.y-view.frame.origin.y-targetyoffset);
CGAffineTransform move=CGAffineTransformMakeTranslation(targetx, targety);
CGAffineTransform scale=CGAffineTransformMakeScale(targetscale,targetscale);
return CGAffineTransformConcat(scale, move);
}
And don't forget to transform the cell's rect the global coordinate space so the start frame is correct for the whole window not just the cells position in the table.
CGRect cellRect=[_tableView rectForRowAtIndexPath:[_tableView indexPathForSelectedRow]];
cellRect=[self.tableView convertRect:cellRect toView:presenting.view];
hope this helps!
Apple provides a wwdc sample app 'LookInside', accompanying talk 228: 'A look inside presentation controllers'. It features 2 custom presentations, of which one animates the size of the presented view controller. A look inside that code should help you out ;)
I have a UIView. I applied the animation to its CALayer.
[view.layer addAnimation:groupAnimation forKey:name];
I want the final state of the layer to be the state of the UIView after the animation. Let's say I rotated by 45degrees and moved to a new position using the layer; is it possible for my view to be in that state after the animation? Because right now, after the animation, it goes back to the original state of the UIView. I hope to receive some help with this. Thanks.
The thing to understand is that layer animation is just animation; it's merely a kind of temporary "movie" covering the screen. When the animation ends, the "movie" is removed, thus revealing the true situation. It is up to you to match that situation with the final frame of the movie.
UIView animation does this for you, to a great extent. But layer animation leaves it entirely up to you.
Thus, let's say you animate a position change; doing something so that the layer or view actually is where you animated to is completely up to you.
The usual thing is to perform the changes yourself as a separate set of commands. But be careful not to do anything that might trigger implicit layer animation, as this will conflict with the animation you are trying to perform explicitly.
Here's example code (not related to yours, but it does show the general form):
CAAnimationGroup* group = // ...
// ... configure the animation ...
[view.layer addAnimation:group forKey:nil];
// now we are ready to set up the view to look like the final "frame" of the animation
[CATransaction setDisableActions:YES]; // do not trigger implicit animation by mistake
view.layer.position = finalPosition; // assume we have worked this out
When animating a CALayer or using a CAAnimationGroup, the following properties must be set, e.g.:
groupAnimation.removedOnCompletion = NO;
groupAnimation.fillMode = kCAFillModeForwards;
See also: After Animation, View position resets
Also note that it may be helpful to apply animations directly to the view itself, rather than by accessing the view's layer. This is accomplished using animation blocks, which I have found to be very useful.
Block style animations can be customized in many ways, but here's a basic example, which could be invoked within a function when your view needs to animate:
- (void) animateMyView
{
CGRect newViewFrame = CGRectMake(x,y,w,h);
[UIView animateWithDuration:0.5
delay:0
options: (UIViewAnimationOptionCurveLinear )
animations:^{
self.myView = CGAffineTransformMakeRotation (45);
[self.myView setBounds:newViewFrame];
}
completion:NULL];
}
For more information, see Apple's documentation on View Animation.
I put UIImageView in my Scene from Object library, and give it an image and defined OUTLET in .h file. Now I want to check its coordinates, or center point, or frame X,Y,Width,Height.
I am using
This
CGRect newFrameSize = CGRectMake(recycleBin.frame.origin.x, recycleBin.frame.origin.y,
recycleBin.frame.size.width, recycleBin.frame.size.height);
or
CGRect newFrameSize = recycleBin.frame;
by using this
NSLog(#"%#", NSStringFromCGRect(newFrameSize));
gives same result that is
2013-01-16 21:42:25.101 xyzapp[6474:c07] {{0, 0}, {0, 0}}
I want its actual position and size when viewcontroller loaded, so when user click on image view it will fadeout by zoom-in towards users and will disappear, and when user tap on reset button, it fadein and zoom-in back to original form (reverse to the previous animation).
Also give me hint, how to perform this animation on UIImageView or any button or label. Thx
Unfortunately, you can't check an item's actual frame as set in IB in -viewDidLoad. The earliest you can check it (that I've found) is by overriding -viewDidAppear:. But, since -viewDidAppear: could be called multiple times throughout the life of the view, you need to make sure you're not saving the frame it's in the modified state.
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
if(savedFrame == CGRectZero) {
savedFrame = self.recycleBin.frame;
NSLog(#"Frame: %#", NSStringFromCGRect(savedFrame));
}
}
Where savedFrame is a member variable (or you could make it a property).
From the description of the animation you're wanting, it sounds like adjusting the frame isn't the way to go about it. It sounds like you're wanting to get the effect of the view stretching and fading out (and the reverse when being reset)? If so, some code like this might be more so what you're looking for...
Fade out:
float animationDuration = 2.0f; // Duration of animation in seconds
float zoomScale = 3.0f; // How much to zoom in duration the animation
[UIView animateWithDuration:animationDuration animations:^{
CGAffineTransform transform = CGAffineTransformMakeScale(zoomScale, zoomScale);
self.recycleBin.transform = transform;
self.recycleBin.alpha = 0; // Make fully transparent
}];
And then, to reset the view:
float animationDuration = 2.0f; // Duration of animation in seconds
[UIView animateWithDuration:animationDuration animations:^{
CGAffineTransform transform = CGAffineTransformMakeScale(1.0f, 1.0f);
self.recycleBin.transform = transform;
self.recycleBin.alpha = 1.0; // Make fully opaque
}];
You can play around with the numbers to see if you get the effects you desire. Most animations in iOS are actually extremely simple to do. This code would work for any UIView subclass.
It sounds as if your IBOutlet is not attached to your class.
Open up your view controller header file (if that is where you property declaration is) and look beside the declaration:
Notice how on the first IBOutlet, the circle (to the left of the line number) is filled in. This means that it is connected to your scene. However, the second one is not (the circle is not filled in).
This question has been asked before but in a slightly different way and I was unable to get any of the answers to work the way I wanted, so I am hoping somebody with great Core Animation skills can help me out.
I have a set of cards on a table. As the user swipes up or down the set of cards move up and down the table. There are 4 cards visible on the screen at any given time, but only the second card is showing its face. As the user swipes the second card flips back onto its face and the next card (depending on the swipe direction) lands in it's place showing its face.
I have set up my card view class like this:
#interface WLCard : UIView {
UIView *_frontView;
UIView *_backView;
BOOL flipped;
}
And I have tried flipping the card using this piece of code:
- (void) flipCard {
[self.flipTimer invalidate];
if (flipped){
return;
}
id animationsBlock = ^{
self.backView.alpha = 1.0f;
self.frontView.alpha = 0.0f;
[self bringSubviewToFront:self.frontView];
flipped = YES;
CALayer *layer = self.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / 500;
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, M_PI, 1.0f, 0.0f, 0.0f);
layer.transform = rotationAndPerspectiveTransform;
};
[UIView animateWithDuration:0.25
delay:0.0
options: UIViewAnimationCurveEaseInOut
animations:animationsBlock
completion:nil];
}
This code works but it has the following problems with it that I can't seem to figure out:
Only half of the card across the x-axis is animated.
Once flipped, the face of the card is upside down and mirrored.
Once I've flipped the card I cannot get the animation to ever run again. In other words, I can run the animation block as many times as I want, but only the first time will animate. The subsequent times I try to animate lead to just a fade in and out between the subviews.
Also, bear in mind that I need to be able to interact with the face of the card. i.e. it has buttons on it.
If anybody has run into these issues it would be great to see your solutions. Even better would be to add a perspective transform to the animation to give it that extra bit of realism.
This turned out to be way simpler than I thought and I didn't have to use any CoreAnimation libraries to achieve the effect. Thanks to #Aaron Hayman for the clue. I used transitionWithView:duration:options:animations:completion
My implementation inside the container view:
[UIView transitionWithView:self
duration:0.2
options:UIViewAnimationOptionTransitionFlipFromBottom
animations: ^{
[self.backView removeFromSuperview];
[self addSubview:self.frontView];
}
completion:NULL];
The trick was the UIViewAnimationOptionTransitionFlipFromBottom option. Incidentally, Apple has this exact bit of code in their documentation. You can also add other animations to the block like resizing and moving.
Ok, this won't be a complete solution but I'll point out some things that might be helpful. I'm not a Core-Animation guru but I have done a few 3D rotations in my program.
First, there is no 'back' to a view. So if you rotate something by M_PI (180 degrees) you're going to be looking at that view as though from the back (which is why it's upside down/mirrored).
I'm not sure what you mean by:
Only half of the card across the x-axis is animated.
But, it it might help to consider your anchor point (the point at which the rotation occurs). It's usually in the center, but often you need it to be otherwise. Note that anchor points are expressed as a proportion (percentage / 100)...so the values are 0 - 1.0f. You only need to set it once (unless you need it to change). Here's how you access the anchor point:
layer.anchorPoint = CGPointMake(0.5f, 0.5f) //This is center
The reason the animation only ever runs once is because transforms are absolute, not cumulative. Consider that you're always starting with the identity transform and then modifying that, and it'll make sense...but basically, no animation occurs because there's nothing to animate the second time (the view is already in the state you're requesting it to be in).
If you're animating from one view to another (and you can't use [UIView transitionWithView:duration:options:animations:completion:];) you'l have to use a two-stage animation. In the first stage of the animation, for the 'card' that is being flipped to backside, you'll rotate the view-to-disappear 'up/down/whatever' to M_PI_2 (at which point it will be 'gone', or not visible, because of it's rotation). And in the second stage, you're rotate the backside-of-view-to-disappear to 0 (which should be the identity transform...aka, the view's normal state). In addition, you'll have to do the exact opposite for the 'card' that is appearing (to frontside). You can do this by implementing another [UIView animateWithDuration:...] in the completion block of the first one. I'll warn you though, doing this can get a little bit complicated. Especially since you're wanting views to have a 'backside', which will basically require animating 4 views (the view-to-disappear, the view-to-appear, backside-of-view-to-disappear, and the backside-of-view-to-appear). Finally, in the completion block of the second animation you can do some cleanup (reset view that are rotated and make their alpha 0.0f, etc...).
I know this is complicated, so you might want read some tutorial on Core-Animation.
#Aaron has some good info that you should read.
The simplest solution is to use a CATransformLayer that will allow you to place other CALayer's inside and maintain their 3D hierarchy.
For example to create a "Card" that has a front and back you could do something like this:
CATransformLayer *cardContainer = [CATransformLayer layer];
cardContainer.frame = // some frame;
CALayer *cardFront = [CALayer layer];
cardFront.frame = cardContainer.bounds;
cardFront.zPosition = 2; // Higher than the zPosition of the back of the card
cardFront.contents = (id)[UIImage imageNamed:#"cardFront"].CGImage;
[cardContainer addSublayer:cardFront];
CALayer *cardBack = [CALayer layer];
cardBack.frame = cardContainer.bounds;
cardBack.zPosition = 1;
cardBack.contents = (id)[UIImage imageNamed:#"cardBack"].CGImage; // You may need to mirror this image
[cardContainer addSublayer:cardBack];
With this you can now apply your transform to cardContainer and have a flipping card.
#Paul.s
I followed your approach with card container but when i applt the rotation animation on card container only one half of the first card rotates around itself and finally the whole view appears.Each time one side is missing in the animation
Based on Paul.s this is updated for Swift 3 and will flip a card diagonally:
func createLayers(){
transformationLayer = CATransformLayer(layer: CALayer())
transformationLayer.frame = CGRect(x: 15, y: 100, width: view.frame.width - 30, height: view.frame.width - 30)
let black = CALayer()
black.zPosition = 2
black.frame = transformationLayer.bounds
black.backgroundColor = UIColor.black.cgColor
transformationLayer.addSublayer(black)
let blue = CALayer()
blue.frame = transformationLayer.bounds
blue.zPosition = 1
blue.backgroundColor = UIColor.blue.cgColor
transformationLayer.addSublayer(blue)
let tgr = UITapGestureRecognizer(target: self, action: #selector(recTap))
view.addGestureRecognizer(tgr)
view.layer.addSublayer(transformationLayer)
}
Animate a full 360 but since the layers have different zPositions the different 'sides' of the layers will show
func recTap(){
let animation = CABasicAnimation(keyPath: "transform")
animation.delegate = self
animation.duration = 2.0
animation.fillMode = kCAFillModeForwards
animation.isRemovedOnCompletion = false
animation.toValue = NSValue(caTransform3D: CATransform3DMakeRotation(CGFloat(Float.pi), 1, -1, 0))
transformationLayer.add(animation, forKey: "arbitrarykey")
}
I'm making an iPhone App which involves balloons (UIImageViews) being spawned from the bottom of the screen and moving up to the top of the screen.
The aim is to have the UIImageViews set up so that a tap gesture on a balloon causes the balloons to be removed from the screen.
I have set up the GestureRecognizer and taps are being recognized.
The problem I am having is that the animation method I am using does not provide information about where the balloon is being drawn at a specific point in time, and treats it as already having reached the final point mentioned.
This causes the problem of the taps being recognized only at the top of the screen(which is the balloon's final destination).
I have pasted my code for animation here:
UIViewAnimationOptions options = UIViewAnimationOptionBeginFromCurrentState|UIViewAnimationOptionAllowUserInteraction;
[UIView animateWithDuration:2.0 delay:0.0 options:options animations:^{
balloonImageView.center = p;
} completion:^(BOOL finished) {
if (finished) {
balloonImageView.hidden= TRUE;
balloonImageView.image=nil;
}
I keep track of where an image is by giving a unique tag to a UIImageView and checking if gesture.view.tag = anyBalloonObject.tag and if it does I destroy the balloon.
My basic question is, is there another animation tool I can use? I understand that I can set a balloon's finish point to slightly higher than where it is on screen until it reaches the top but that seems like it is very taxing on memory.
Do you have any recommendations? I looked through the Core Animation reference, and didn't find any methods that suited my needs.
In addition will the Multi-threading aspects of UIViewAnimation affect the accuracy of the tap system?
Thank You,
Vik
You shouldnt animate game-objects (objects you interact with while they are moving) like that.
You should rather use a NSTimer to move the ballons.
-(void)viewDidLoad {
//Set up a timer to run the update-function
timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(update) userInfo:NULL repeats:YES];
}
-(void) update {
for (int i = [balloonArray count] - 1; i >= 0; i--) { //Loop through an array containing all your balloons.
UIImageView *aBalloon = [balloonArray objectAtIndex:i]; //Select balloon at the current loop index
aBallon.center = CGPointMake(aBallon.center.x, aBalloon.center.y + 1); //Change the center of that balloon, in this case: make it go upwards.
}
}
Here is what you need to declare in .h:
NSTimer *timer;
NSMutableArray *ballonArray;
//You should use properties on these also..
You will have to create a spawn method which adds balloons to the screen AND to the array.
When you have done that, it's simple to implement the touch methods, You can just loop trough the balloons and check:
//You need an excact copy of the loop from earlier around this if statement!
If (CGRectContainsPoint(aBalloon.frame, touchlocation)) { //you can do your own tap detection here inthe if-statement
//pop the balloon and remove it from the array!
}
Hope that isnt too scary-looking, good luck.