In facebook'a new app, Pages, when you swipe down the menu appears at the top. The animation I am trying to do is the animation when you tap the settings button which is when each cell moves to the left one at a time, but very smoothly. How can I achieve such an animation without using Facebook's pop engine in Objective C ?
Bear in mind that each cell is probably a custom subclass of UIView (i.e. not UITableViewCell or other apple class) so you will have to design your UI carefully.
The animation, however, is easily achievable using the UIView class. Apple's documentation is a good place to start to learn about animation.
What you want is something like:
NSTimeInterval delay = 0.2;
for (UIView *myView in myViewArray) {
[UIView animateWithDuration:0.5 delay:delay options:UIViewAnimationOptionCurveEaseInOut animations:^{
/*
* This is where you set the properties you want to animate.
* If you're using AutoLayout (i.e. NSLayoutConstraint) you need to set the constant property of the relevant constraint, not the view's frame property.
*/
} completion:nil];
delay += 0.2;
}
This will provide you with animations that occur one after the other (0.2 seconds apart).
Related
I have a UITextField which has an accessory view. I also have another view which resides at the bottom of the screen. I want this view to animate up as the keyboard shows, which I have done plenty of times by utilizing the UIKeyboardWillShowNotification. However, this time it is a little special since I want the bottom view to follow the top of the keyboard and not the top of the accessory view.
Obviously I have tried this solution:
[UIView animateWithDuration:keyboardAnimationDuration delay:0 options:keyboardAnimationCurve animations:^{
viewBottomConstraint.constant = keyboardHeight - accessoryViewHeight;
[self.overviewViewController.view layoutIfNeeded];
} completion:nil];
(keyboardAnimationDuration, keyboardAnimationCurve and keyboardHeight all come from the userInfo dictionary of the keyboard notification)
This solution gives me the correct end position of the bottom view, but the animation is slightly off since the keyboard (including the accessory view) has to traverse a longer distance in the same duration (to the top of the accessory view instead of to the top of the keyboard).
I have considered calculating a relative animation duration for my bottom view like this:
keyboardToAccessoryRatio = (keyboardHeight - accessoryViewHeight) / keyboardHeight
relativeDuration = keyboardAnimationDuration * keyboardToAccessoryRatio
And then have the animation start with a delay of keyboardAnimationDuration - relativeDuration. However, this would only work nicely if the keyboard was using the UIViewAnimationOptionCurveLinear curve, but it is, in fact, using UIViewAnimationCurveEaseInOut.
So any other suggestions?
PS. I cannot simply add my button view to the accessory view as they are actually in separate view controllers. The animation is done as a part of a custom transition within a UIViewControllerAnimatedTransitioning class.
In the end I gave up and added the accessory view as a regular view which I made follow the keyboard.
My button rotates upon clicks in an animated way by using UIView's animateWithDuration:animations:, however the button is not animating.
I'm trying to reimplement UITableView's disclosure indicator. I am making my own because UITableView's is not flexible enough. For example, I would like mine to be on the left, but this is not possible.
My disclosure button subclass almost works. It rotates correctly, but when it rotates there is no animation. It should goes from the non rotated to rotated; there is no animation in between.
#define DegreesToRadians(x) ((x) * M_PI / 180.0)
- (void)rotateToOpenPosition {
[UIView animateWithDuration:0.5 animations:^{
[self setTransform: CGAffineTransformMakeRotation((CGFloat)DegreesToRadians(90))];
}];
}
- (void)rotateToClosedPosition {
[UIView animateWithDuration:0.5 animations:^{
[self setTransform: CGAffineTransformMakeRotation((CGFloat)DegreesToRadians(0))];
}];
}
I'm also using Auto Layout in the nib that contain the UITableViewCell the disclosure button is in.
This might be related to the problem. Here are the constraints:
EDIT: This is most likely not the problem, as I tried removing auto layout from the same nib, and the problem still occurs.
Why is it not rotating, and how can I fix it?
I was calling [tableView reloadData] right after I called the methods to start animating the button.
Stupid.
I have a UIView "MainView" that initially appears as follows:
The gradient bar is part of MainView, the whitespace beneath is part of a Container View subview.
When the search button in top-right is tapped, I animate a searchBar from offscreen to be visible in the view:
I manage to do this by the following code:
CGRect currentViewFrame = self.view.bounds;
currentViewFrame.origin.y += searchViewHeight;
[UIView animateWithDuration:0.4
delay:0.0
usingSpringWithDamping:1.0
initialSpringVelocity:4.0
options:UIViewAnimationOptionCurveEaseInOut animations:^{
self.view.frame = currentViewFrame;
}
completion:^(BOOL finished)
{
}];
Visually, the result of this animation is perfect. The entire view shifts, and the searchBar is now on screen. However, the searchBar does not respond to interaction. Correct me if I'm wrong, but I expect this is because the MainView's frame no longer includes the screen area that the searchBar now occupies, so its effectively a gesture deadzone.
So this makes me think that instead of lazily animating the entire MainView down to accomodate the searchBar, I must instead individually translate all subviews of MainView one at a time. In this simple situation, that would not be a big problem, but I can envision a circumstance with tens of subviews making that completely unrealistic.
What is the best method to accomplish what I am trying to do? Is there a secret to animating entire views/subviews without having gesture deadzones? Thanks in advance!!
I want to make a UIView animate when it's being closed. I tried reading the following:
http://felipe.sabino.me/ios/2012/05/10/ios-uiview-transition-effects/
iPhone UIView Animation Best Practice
iOS UIView Animation CATransform3DMakeRotation confusion
However, I'd like to make it transition from the side of the screen, as per the image in the Google Chrome app.
Is there another animation that is set for this? I was not able to find it... I'm assuming it has to do with animateWithDuration or a CATransform...can somebody point me in the right direction for this?
[EDIT]
I used the below post for an answer as well as this post:
Setting a rotation transformation to a UIView or its layer doesn't seem to work?
I was able to add multiple animations as per below:
[UIView animateWithDuration: .2
delay: 0
options: (UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction)
animations:^{self.view.center = CGPointMake(self.view.frame.origin.x * 3, self.view.frame.origin.y * 2), self.view.transform = CGAffineTransformMakeRotation(M_PI_4/2);}
completion:nil];
Previously I was not aware you can add multiple animations so easily. That adds rotation as well as the linear movement together.
Animate your view so it moves offscreen/shrinks/expands/fades, then do the actual removal when the animation ends.
You can do this by altering the properties of the view (position/size/offset) between a beginAnimations/commitAnimations block. UIKit will then animate these properties over the time specified.
E.g something like;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.30f];
view.transform =
CGAffineTransformMakeTranslation(
view.frame.origin.x,
480.0f + (view.frame.size.height/2) // move the whole view offscreen
);
background.alpha = 0; // also fade to transparent
[UIView commitAnimations];
In the animation end notification you can then remove the view.
I've never run Chrome on iOS, so I have to try to guess what your screenshot is showing.
Does the animation go off the screen while shrinking and turning to one side?
And do you mean you want to animate a UIViewController, or a UIView? Are you closing a view controller?
If it's a view controller, how are you managing your view controllers? Are you using a navigation controller, or are you presenting a set of modal view controllers, or some other method?
I have data structured as a tree (and showed in UITableView) and I would like to show it the way it is usually done using UINavigationController and pushing child views on to the stack. The problem is that my UITableView (in an iPad app) takes only 1/6 of the screen (there is a UINavigationController that handles other fullscreen iPad screens in this app, so using NavigationController to control the levels of table is the good way).
Is there a simple way to get a good visual effect of changing the levels of TableView without using NavigationController? Right now I just change the data source and reload data, but that does something like a flicker on the screen (the user can't really see, that the structure of the data is tree-like).
I thought of creating a few TableViews and then just animating the resize (from full width to 0 the TableView that we are leaving, and from 0 to width at the same time of the another one) of a table just to make something like segue effect - but I am not sure if this is a good approach.
You can use reloadSections:withRowAnimation: with UITableViewRowAnimationLeft and UITableViewRowAnimationRight instead of a default reloadData. This will look like the push you are looking for.
Reference: http://developer.apple.com/library/ios/documentation/uikit/reference/UITableView_Class/Reference/Reference.html#//apple_ref/occ/instm/UITableView/reloadSections:withRowAnimation:
You can try this code (after you set the proper values:))
__block CGRect frame = tableView.frame;
[UIView animateWithDuration:0.5 animations:^{
frame.origin.x -=tableView.frame.size.width;
} completion:^(BOOL finished) {
frame.origin.x = yourViewThatContainsTheTable.frame.size.width
tableView.frame = frame;
[tableView reloadData];
[UIView animateWithDuration:0.3 animations:^{
frame.origin.x = 0;
tableView.frame = frame;
}];
}];
Basically if you are using subclasses of UIView you can use [UIView animateWith...] methods to perform simple animations or you can use CAAnimations/CABasicAnimation/CAAnimationGroup/CAKeyframeAnimation for more complex animations on subclasses of UIView.
If you want a custom transition for a UIViewController you can use CATransition.