How can i create UIImageViews Slide over ? I have a button and two UIImageViews in both saide of the View, when the button is pressed two UIImageViews should be slide over the view from the Two side . Can some body give me a start ?
[UIView animateWithDuration:durationOfAnimation animations:^{
CGRect imageView1Frame = imageView1.frame;
imageView1Frame.origin.x += 100 //or whatever number of pixels you want to slide them
imageView1.frame = imageView1Frame;
CGRect imageView2Frame = imageView2.frame;
imageView2Frame.origin.x += 100 //or whatever number of pixels you want to slide them
imageView2.frame = imageView2Frame;
}];
Where durationOfAnimation is how long you want it to take in seconds.
Related
I am trying to make a simple application where there are 3 buttons. When user clicks any of the button, they are animated(moved) to their new positions! All this works from this code:
[UIView animateWithDuration:1.2
delay:0.1
options: UIViewAnimationCurveEaseOut
animations:^
{
//Moving the Sum (UIButton which will move through this animation)
CGRect frame = Sum.frame;
frame.origin.y = -20;
frame.origin.x = (-120);
Sum.frame = frame;
.....
....
}
completion:^(BOOL finished)
{
NSLog(#"Completed");
//adding subview after the animation is complete! newView is an example!
[self.view addSubview:newView];}];
The Problem is that once i add a subview to the main view, All buttons come back to their old position! meaning they weren't moved permanently.. how can i solve this? Plz help guys!
What happens when you add a view? A layout is performed. You could have done two mistakes
You are using autolayout.
If you are using autolayout, changing frames directly is not advised and a relayout will update the views to their original position using current constraints.
You are setting the frame position in layoutSubviews, viewWillLayout or viewDidLayout.
Check where you are setting the original position. Can the method be called multiple times?
You have save the X,Y Position of the new frame & then set this frame by coding.
I have a UIView -- call it HomeView that contains a UITableView and a UISearchBar. That is, they are subviews. These are added in viewDidLoad for HomeView. A picture is worth a thousand words:
As can be seen from these screenshots, the first item in the UITableView is hidden once the UISearchBar is displayed. Here is the relevant code:
- (void) viewDidLoad
self.table_view = [UITableView.alloc.initWithFrame: self.view.bounds style:UITableViewStylePlain];
self.table_view.bounds.origin.y += 44;
self.table_view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
// ^^^ This is the code I believe is one source of my problem
// Triggered when search button in nav bar is pressed
// code to calculate delta here
// Here's how the view is animated. The search bar frame
// is dropped down (works), and ideally, the tableview
// drops down exactly the same amount at the same time.
// If the action is to hide, then the inverse happens
// because +delta+ will have been calculated as a
// negative number above.
[UIView animateWithDuration: 0.7
delay: 0.0
options: UIViewAnimationOptionCurveEaseIn
animations:^ {
self.searchBar.frame = CGRectOffset(#searchBar.frame, 0.0, delta);
}
completion:^(BOOL finished){
self.searchBarVisible = !self.searchBarVisible
self.searchBar.hidden = !self.searchBarVisible
edgeInsets = UIEdgeInsetsMake(0.0f, self.searchBarVisible ? delta : 0.0f, 0.0f, 0.0f)
[tableView setContentInset: edgeInsets]
}
];
What actually happens is that the search bar slides down as expected in response to the search button press and then slides up on next button press. However, the table view never adjusts.
The problem, as near as I can tell, is that in viewDidLoad, the enclosing HomeView has not been rendered, so the size is as-yet unknown. I can get the screen dimensions and use that, but I thought the auto resizing mask was better practice, right?
Are there obvious flaws in this, and is there a way to get the table view to animate down at the same time the search bar is?
Thanks
All right, let's try this again!
In your animation block, change the line where you make edgeInsets to:
edgeInsets = UIEdgeInsetsMake(self.searchBarVisible ? delta : 0.0f, 0.0f, 0.0f, 0.0f);
From what I can tell, the first argument is the top, and the one you had set was the left inset.
Im struggling with some iOS development and I hope someone will be able to help me with an advice. I want to implement a stack of UIViews that will look like a deck of cards. User should be able to swipe out 'cards' with touch. I thought of UIScrollViews with pagingEnabled to give an impression that cards are separate. However, UIScrollView can swipe from horizontally where something appears from left or right side. I want my deck of cards to be in the middle of the screen so the user can swipe cards from the deck without seeing the card appearing on the left or right side.
Also, I was thinking of using Touch Methods ( touchesBegan, touchesMoved, etc.) to move views. It could work... but Im worried that I wont be able to reproduce proper mechanics of the card ( friction, bouncing effect when the swipe is to short and so on..).
Can someone please point me to a proper technique or advice some tutorials? I did some research already but I couldn't find anything that would be helpful.
Here is an image of the effect that I would like to achieve.
And what I want to achieve is to swipe cards out of the deck.
Thanks a lot!
I guess you want a swipe to take the top card of the stack and “shuffle” it to the bottom of the stack, revealing the second card on the stack, like this:
The animation is much smoother in real life. I had to use a low frame rate to make the animated GIF small.
One way to do this is to create a subclass of UIView that manages the stack of card views. Let's call the manager view a BoardView. We'll give it two public methods: one for shuffling the top card to the bottom, and one for shuffling the bottom card to the top.
#interface BoardView : UIView
- (IBAction)goToNextCard;
- (IBAction)goToPriorCard;
#end
#implementation BoardView {
BOOL _isRestacking;
}
We'll use the _isRestacking variable to track whether the board view is animating the movement of a card off to the side.
A BoardView treats all of its subviews as card views. It takes care of stacking them up, with the top card centered. In your screen shot, you offset the lower cards by slightly randomized amounts. We can make it look a little sexier by rotating the lower cards randomly. This method applies a small random rotation to a view:
- (void)jostleSubview:(UIView *)subview {
subview.transform = CGAffineTransformMakeRotation((((double)arc4random() / UINT32_MAX) - .5) * .2);
}
We'll want to apply that to each subview as it's added:
- (void)didAddSubview:(UIView *)subview {
[self jostleSubview:subview];
}
The system sends layoutSubviews whenever a view's size changes, or when a view has been given new subviews. We'll take advantage of that to lay out all of the cards in a stack in the middle of the board view's bounds. But if the view is currently animating a card out of the way, we don't want to do the layout because it would kill the animation.
- (void)layoutSubviews {
if (_isRestacking)
return;
CGRect bounds = self.bounds;
CGPoint center = CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
UIView *topView = self.subviews.lastObject;
CGFloat offset = 10.0f / self.subviews.count;
for (UIView *view in self.subviews.reverseObjectEnumerator) {
view.center = center;
if (view == topView) {
// Make the top card be square to the edges of the screen.
view.transform = CGAffineTransformIdentity;
}
center.x -= offset;
center.y -= offset;
}
}
Now we're ready to handle the shuffling. To “go to the next card”, we need to animate moving the top card off to the side, then move it to the bottom of the subview stacking order, and then animate it back to the middle. We also need to nudge the positions of all of the other cards because they've all moved closer to the top of the stack.
- (void)goToNextCard {
if (self.subviews.count < 2)
return;
First, we animate the movement of the top card off to the side. To make it look sexy, we rotate the card as we move it.
UIView *movingView = self.subviews.lastObject;
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationCurveEaseInOut animations:^{
_isRestacking = YES;
CGPoint center = movingView.center;
center.x = -hypotf(movingView.frame.size.width / 2, movingView.frame.size.height / 2);
movingView.center = center;
movingView.transform = CGAffineTransformMakeRotation(-M_PI_4);
}
In the completion block, we move the card to the bottom of the stack.
completion:^(BOOL finished) {
_isRestacking = NO;
[self sendSubviewToBack:movingView];
And to move the now-bottom card back into the stack, and nudge all of the other cards, we'll just call layoutSubviews. But we're not supposed to call layoutSubviews directly, so instead we use the proper APIs: setNeedsLayout followed by layoutIfNeeded. We call layoutIfNeeded inside an animation block so the cards will be animated into their new positions.
[self setNeedsLayout];
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction animations:^{
[self jostleSubview:movingView];
[self layoutIfNeeded];
} completion:nil];
}];
}
That's the end of goToNextCard. We can do goToPriorCard similarly:
- (void)goToPriorCard {
if (self.subviews.count < 2)
return;
UIView *movingView = [self.subviews objectAtIndex:0];
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
_isRestacking = YES;
CGPoint center = movingView.center;
center.x = -movingView.frame.size.height / 2;
movingView.center = center;
movingView.transform = CGAffineTransformMakeRotation(-M_PI_4);
} completion:^(BOOL finished) {
_isRestacking = NO;
UIView *priorTopView = self.subviews.lastObject;
[self bringSubviewToFront:movingView];
[self setNeedsLayout];
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction animations:^{
[self jostleSubview:priorTopView];
[self layoutIfNeeded];
} completion:nil];
}];
}
Once you have BoardView, you just need to attach a swipe gesture recognizer that sends it the goToNextCard message, and another swipe gesture recognizer that sends it the goToPriorCard message. And you need to add some subviews to act as cards.
Another detail: to get the edges of the cards to look smooth when they're jostled, you need to set UIViewEdgeAntialiasing to YES in your Info.plist.
You can find my test project here: http://dl.dropbox.com/u/26919672/cardstack.zip
Icarousel has that exact built in scrolling using UIImageViews.
https://github.com/nicklockwood/iCarousel. There's several different effects in there, I forget the name of the one you're describing.
I have an UIImageView of an white color arrow image. I am animating it to rotate 90 degree's. I also want that UIImageView to change to a black color arrow image as it rotates.
The only solution I can think of is to stack the two images on top of each other, animate both when ever it rotates and change the white color arrow image's alpha (so it fades in and out).
Is there a simpler way to obtain this effect?
Is there a build in transition effect to fade one image out and another image in?
You seem to have a good grasp of what to do. Probably the easiest repeatable way to do this is to create a UIView subclass and add both of your arrows to it. Then add a couple of functions like these.
-(void)rotate90{
blackArrow.alpha = 0;
[self bringSubviewToFront:blackArrow];
[UIView animateWithDuration:1 animations:^{
blackArrow.alpha = 1;
blackArrow.transform = CGAffineTransformMakeRotation(M_PI_2);
whiteArrow.transform = CGAffineTransformMakeRotation(M_PI_2);
}];
}
-(void)rotate0{
whiteArrow.alpha = 0;
[self bringSubviewToFront:whiteArrow];
[UIView animateWithDuration:1 animations:^{
whiteArrow.alpha = 1;
blackArrow.transform = CGAffineTransformMakeRotation(0);
whiteArrow.transform = CGAffineTransformMakeRotation(0);
}];
}
In the Comcast Xfinity iPad app, there is a small button called "Filter by" at the bottom of the screen.
When a user touch the button, a overlay menu will slide up (like the menu UI in Android).
Can anyone give me some hints about how to create this kind of overlay menu?
Thanks.
For this you can create a UIView in your nib and make it look like the menu you need, then in viewdidload you can set its origin to be just off the screen and when you want it to appear just use an animation to slide it up into view and then slide it back off the screen when you're done.
In viewDidLoad:
CGRect frame = [your_menu_view].frame;
frame.origin.y += frame.size.height;
[your_menu_view].frame = frame;
When you are ready to show it:
NSTimeInterval animationDuration = 0.3;//play around with the animation length here
CGRect frame = [your_menu_view].frame;
[UIView beginAnimations:#"MenuSlideIn" context:nil];
[UIView setAnimationDuration:animationDuration];
frame.origin -= frame.size.height;
[your_menu_view].frame = frame;
[UIView commitAnimations];
Then use the same to get rid of it except subtract add its height.
haven't tested it but it should work.