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?
Related
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'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.
Im using CGAffineTransformMakeScale to scale a UIView from 0.1 to 1.0.
The problem is that the view is also rotating while the scaling is being animated. So it ends with a scale of 1.0 AND 90º of rotation.
[self presentModalViewController:slideTwoViewController animated: NO];
[slideTwoViewController.view setTransform:CGAffineTransformMakeScale(0.1,0.1)];
[UIView beginAnimations: nil context: nil];
[UIView setAnimationDuration:2.0];
[slideTwoViewController.view setTransform:CGAffineTransformMakeScale(1.0,1.0)];
[UIView commitAnimations];
The initial application orientation is landscape left. So when the animation ends the UIView looks like in portrait.
Is this supposed to happen? am I missing something?
Thanks
My bet, is the view already have a transform set and you are overwriting it with the new transform and it is animating the difference.
Try using the following function instead:
CGAffineTransformScale(<#CGAffineTransform t#>, <#CGFloat sx#>, <#CGFloat sy#>)
With this function, you pass the original transform slideTwoViewController.view.transform and your scale factor.
slideTwoViewController.view.transform = CGAffineTransformScale(slideTwoViewController.view.transform, 0.1, 0.1);
Despite of scaling rootview try to add subview which become your new pseudo rootview (with all the rest subviews connected underneath) and then scale pseudo rootview. This way you are avoiding any transform collisions made by system on the real rootview (e.g. autorotating) and then you can use CGAffineTransformMakeScale freely.
I am switching between views using view animations, its works but I am having an issue with interface orientation.
I have two views on window.
authenticationViewCont
mainViewCont
Both have a button, when button clicked on authenticationViewCont I remove it and show mainViewCont and vice versa.
Once I addSubview the authenticationViewCont.view and putting device in portrait mode then removed it by removeFromSuperview then I change device orientation to landscape in my hands then again addSubview the authenticationViewCont. It first displayed animating in portrait and changing orientation after animation.
-(void)mainToAuthentication {
CGRect originalFrame = authenticationViewCont.view.frame;
CGRect modifiedFrame = originalFrame;
modifiedFrame.origin.y = originalFrame.size.height;
// made view out from screen
authenticationViewCont.view.frame = modifiedFrame;
// add sub view on top of other views
[self.window addSubview:authenticationViewCont.view];
// transiting view from bottom to center of screen
[UIView animateWithDuration:0.5
animations:^{ authenticationViewCont.view.frame = originalFrame; }
completion:^(BOOL finished){ mainViewCont.view removeFromSuperview; }];
}
-(void)authenticationToMain {
CGRect originalFrame = mainViewCont.view.frame;
CGRect modifiedFrame = originalFrame;
modifiedFrame.origin.y = -originalFrame.size.height;
// made view out from screen
mainViewCont.view.frame = modifiedFrame;
// add sub view on top of other views
[self.window addSubview:mainViewCont.view];
// transiting view from top to center of screen
[UIView animateWithDuration:0.5
animations:^{ mainViewCont.view.frame = originalFrame; }
completion:^(BOOL finished){ authenticationViewCont.view removeFromSuperview; }];
}
How can I make it to display in current interface orientation instead of old interface orientation in which it was removeFromSuperview?
I think the problem here is that you are initialliy adding one viewController.view ontop of another then removing the old one.
The problem with window only expects one rootViewController. So the window will only pass rotation events onto the first controller. Meaning your second viewController will not get rotation events until the completionsBlock gets called.
The way I would get around this is to put this switching code inside of a rootViewController that is on the window. Then whenever you do your switching you can pass in the current rotation of the rootviewController and have your authenticationViewController set itself up based on the orientation you pass it
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.