I'm trying to recreate the flipping album animation in iPod.app on the iPad (Music.app in iOS 5). Getting the flipping to work is easy, but I'm having trouble with positioning and enlarging the album. Right now I'm using this code:
[UIView transitionWithView:self.containerView duration:5.0 options:UIViewAnimationOptionTransitionFlipFromLeft | UIViewAnimationOptionShowHideTransitionViews animations:^(void) {
self.firstView.hidden = YES;
self.secondView.hidden = NO;
self.containerView.frame = CGRectMake(600.0, 0.0, 168.0, 1004.0);
} completion:nil];
The flipping works, but there is something strange going on in the animation. The container view does indeed move and resize, but the subviews (firstView and secondView) do not.
Because the superview clips to its bounds (even though I set that to NO; another strange thing!), it appears like the subviews are getting "cut" when the container view moves.
I hope you guys understand the problem. Any Core Animation hero who can help me with this? Thanks.
Have you set the autoresize mask on the child views? Those are used to automatically resize or reposition a view when its superview’s bounds change.
Related
I started studying objective-c using the iPhone and iPad apps for Absolute Beginners by Rory Lewis book but i got stuck on the 5th chapter.
I want to make a button that shrinks an image.
My problem is, that after I wrote all the code, the image shrinks to the point (0, 0) of the UIImageView (the top left), while in the video the image shrinks to its center. I've done some research and found out that CGAffineTransform uses the center of the object to make translations, rotations etc.
So why does it not work in my case?
I have the latest Xcode version and haven't done anything strange.
I hope I've been clear. Sorry for my English.
EDIT
Sorry for the code, but i wrote the question from my phone.
Anyway the incriminated part goes something like this
- (IBAction)shrink:(id)sender {
if(hasShrink == NO){
[shrinkButton setTitle:#"Grow" forState:UIControlStateNormal];
}
else if(hasShrink == YES){
[shrinkButton setTitle:#"Shrink" forState:UIControlStateNormal];
}
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
myIcon.transform = CGAffineTransformMakeScale(.25, .25);
hasShrink = YES;
[UIView commitAnimations];
}
All the animations are correctly written and the app does work, it just shrinks to the top left. Why is the point not set to the center of the UIImageView by default like it should be?
EDIT:
I figured out it was a problem caused by AutoLayout.
Once disabled everything went smooth ;)
If you are transforming a view mangled managed by auto-layout, you may experience some strange side-effects. See this answer for more details.
The solution I ended up employing was to encapsulate the view I wanted to transform inside another view of exactly the same size. The outer view had the appropriate layout constraints applied to it while the inner view was simply centered in its container. Applying a CGAffineTransform scale transform to the inner view now centers properly.
Old question... but just in case others come looking:
The CGAffineTransform acts (rotates, scales) around an anchorPoint.
If you are sizing to 0, 0 then your anchor point is set to 0, 0. If you want it to size to a different point, such as the center of the image, you need to change the anchor point.
The anchor is part of a layer
So if you have a UIImageView called imageview, you would make a call like this to set the anchor to the center of imageview:
[imageview.layer setAnchorPoint:CGPointMake(0.5, 0.5)];
Try something like this:
CGAffineTransform t = CGAffineTransformMakeScale(0.5, 0.5);
CGPoint center = imageView.center; // or any point you want
[UIView animateWithDuration:0.5
animations:^{
imageView.transform = t;
imageView.center = center;
}
completion:^(BOOL finished) {
/* do something next */
}];
Next time show your code. It will be easier to help you.
Check this project: https://github.com/djromero/StackOverflow/archive/Q-13706255.zip
You must study how autolayout and autoresize affect your views. In the project above both are disabled to let you see how it works.
I have a UIViewController which has a UIView, that I added in a nib file. This is for an iPad project. I wanted to animate so that when the view loads, this UIView appears from the bottom to the center, so I did the following:
[self.containerView_ setFrameY:self.view.bounds.size.height];
[UIView animateWithDuration:0.6 delay:0.0 options:UIViewAnimationCurveEaseOut animations:^{
[self.containerView_ setCenter:CGPointMake(self.view.bounds.size.width/2, self.view.bounds.size.height/2)];
} completion:^(BOOL finished) {
}];
this all works perfectly on portrait, but on landscape it's messed up because the x center of the containerView is not really centered, it's a bit to the left and hence the animation is not transformed over the y axis, but also to the x axis as well..
I think the issue is that if I can get the containerView to be centered regardless of orientation, that would fix it. I have the auto-resizing mask all set correctly so that it's centered. I think the issue is that the view bounds on landscape is still 768x1024 instead of 1024x768. Any idea on this?
The system's camera app has a UI effect. After taking a photo, it will show the animation, which is the photo shrink and move to the left bottom corner.
How can I implement the effect in my app?
Thanks.
In the view that you're trying to shrink call something like this code:
[UIView animateWithDuration:1.0 animations:^{
// self is the view in this case
// if you call this from the controller, use self.view
self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, smallWidth, smallHeight);
self.bounds = CGRectOffset(self.bounds, amountToMoveX, amountToMoveY);
}];
This might not be exactly the animation you're looking for but it should give you a good start.
I am using a UIView animation to resize and translate a view containing multiple subviews. The animation for the parent view happens perfectly; however, the subviews exhibit strange behaviour. When the animation begins, the subviews are immediately resized and then moved to their final position.
For example, if the duration and delay of the animation was five-seconds, as soon as the animation was called, the subviews would move to the desired end-of-animation values. After five-seconds, the superview would be resized and translated to the desired.
My code for the animation is:
[UIView animateWithDuration:0.5 animations:^{
if (UIDeviceOrientationIsLandscape(self.interfaceOrientation)) {
self.leftPaneView.frame = leftPaneLandscapeFrame;
self.rightPaneContainerView.frame = rightPaneLandscapeFrame;
}
if (UIDeviceOrientationIsPortrait(self.interfaceOrientation)) {
CGFloat offset = 300;
self.leftPaneView.frame = CGRectOffset(leftPanePortraitFrame, -offset, 0);
self.rightPaneContainerView.frame = rightPanePortraitFrame;
}
}];
Any ideas?
Note: rightPaneContainerView contains the view of a UIViewController that is a child of the view controller that calls this animation.
I managed to solve the problem. The content mode for some of the views was set to Left. When the animation started, the views would jump the left, and then be animated to the desired end-of-animation value.
An amateur mistake. Thanks everyone who took a look.
I am looking for a way to do a UIViewAnimationTransitionCurlUp or UIViewAnimationTransitionCurlDown transition on the iPhone but instead of top to bottom, do it from the left to right (or top/bottom in landscape mode). I've seen this asked aroud the internet a few times but none sems to get an answer. However I feel this is doable.
I have tried changing the View's transform and the view.layer's transform but that didn't affect the transition. Since the transition changes when the device changes orientation I presume there is a way to fool the device to use the landscape transition in portrait mode and vice versa?
It's possible to do curls in any of the four directions by using a container view. Set the container view's transformation to the angle you want and then do the curl by adding your view to the container view, not your app's main view which does not have a transformed frame:
NSView* parent = viewController.view; // the main view
NSView* containerView = [[[UIView alloc] initWithFrame:parent.bounds] autorelease];
containerView.transform = CGAffineTransformMakeRotation(<your angle here, should probably be M_PI_2 * some integer>);
[parent addSubview:containerView];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:containerView cache:YES];
[containerView addSubview:view];
[UIView commitAnimations];
I actually managed to achieve this effect by changing the orientation of my UIViewController. The strange thing is, I had my controller nesten in another one when it wasn't working, but when I set him as the immediate view controller, it worked.
Code that does it:
In a UIViewController that is the main view controller in my app delegate and only allows landscape orientation (as you see in the 2nd method below) I have the following:
-(void)goToPage:(int)page flipUp:(BOOL)flipUp {
//do stuff...
// start the animated transition
[UIView beginAnimations:#"page transition" context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationTransition:flipUp ? UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
//insert your new subview
//[self.view insertSubview:currentPage.view atIndex:self.view.subviews.count];
// commit the transition animation
[UIView commitAnimations];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
I also struggled with this. To get the curl to come from the right or left you can create an intermediate view and transform it. So, let's say the view you're transitioning (myView) is a child of the main window (parentView):
-parentView
-->myView
You will insert an intermediate view in between (easily done in Interface Builder):
-parentView
-->containerView
--->myView
Then, use the following code to flip the container 90 deg left and the transitioned view 90 deg right:
containerView.transform = CGAffineTransformMakeRotation(-M_PI_2);
myView.transform = CGAffineTransformMakeRotation(M_PI_2);
myView will still appear upright to the user but the transition will think it's applied at 90 degrees from the left.
Note that depending on how auto-scaling your views are, you might have to fix the frame sizes after applying the transform, eg
containerView.frame = CGRectMake(0.0, 0.0, 768.0, 1024.0);
myWebView.frame = CGRectMake(0.0, 0.0, 768.0, 1024.0);
Hope this helps. The is the closest you can get to UIViewAnimationTransitionCurlLeft and UIViewAnimationTransitionCurlRight.
I tried the solution of fluXa on iOS5 (So I had to use [UIView trans......]) but it didn't work: the curl still went up or downwards. Apparently the transition now don't take the transform of the view into account. So in case someone else wants to do the same trick on iOS5, the solution is to add another container in between and animate the transition from there.
Here is my code, which is a bit specific since I want to curl 'up' to the left, but with the lower corner curling. As if I am tearing a page out of a note book.
UIView* parent = self.view; // the main view
CGRect r = flipRectSize(parent.bounds);
UIView* containerView = [[UIView alloc] initWithFrame:r];
CGAffineTransform t = CGAffineTransformMakeRotation(-M_PI_2);
t = CGAffineTransformTranslate(t, -80, -80);
containerView.transform = CGAffineTransformScale(t, -1, 1);
[parent addSubview:containerView];
UIView* container2 = [[UIView alloc] initWithFrame:r];
[containerView addSubview:container2];
UIImageView* v = [[UIImageView alloc] initWithFrame:r];
v.image = [UIImage imageWithCGImage:contents.CGImage scale:contents.scale orientation:UIImageOrientationLeftMirrored];
[container2 addSubview:v];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.001 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
[UIView transitionWithView:container2
duration:DURATION_CURL_ANIMATION
options:UIViewAnimationOptionTransitionCurlUp
animations:^{
[v removeFromSuperview];
} completion:^(BOOL finished) {
if (completion) {
completion(finished);
}
[containerView removeFromSuperview];}];});
Notes:
I must admit that the affine transform translate (80,80) doesn't make sense in my mind, but it is necessary for iphone, probably won't work on iPad.
flipSizeRect flips the width and height of a rectangle (you already got that, right?)
the dispatch_after is necessary because I added the container and then want to remove a view from the hierarchy. If I leave out the dispatch nothing animates. My best guess is that we first need to let the system do a layout pass before we can animate a removal.
I don't think there is a way beyond writing a custom animation.
More importantly you probably shouldn't try to it. The curl up and curl down are part of the user interface grammar that tells the user that a view is being lifted up or put down over the existing view. It's supposed to be like a sticky note being put down and then removed. A left<->right curl will most likely be interpreted as the something like ripping a page out of a book. It will confuse users.
Whenever you find yourself trying to do something in the interface that the standard API doesn't do easily, you should ask yourself whether such a novel method will communicate something important to user and whether it is similar to the existing interface grammar. If not, then you shouldn't bother.
Unusual interfaces have an initial wow factor but they lead to frustration and errors in day-to-day use. They can also cause Apple to refuse your app.