// Animate tag view up
[UIView animateWithDuration:.2 animations:^{
_tagView.center = (CGPoint){_tagView.center.x, _tagView.center.y+40};
}];
I'm trying to animate my _tagView up from where it currently is in IB, however the above code does nothing. What am I doing wrong?
First off, if you want to move the view up, you need to decrease your y value (since origin is at upper left by default), like this:
[UIView animateWithDuration:.2 animations:^{
_tagView.center = (CGPoint){_tagView.center.x, _tagView.center.y - 40};
}];
This code works just fine for me using a button to trigger the action. What are you triggering the movement with? Here's an Xcode (iPad) project that will move a view vertically up 40 pixels every button tap.
https://github.com/perlmunger/MoveUp.git
I think you have to switch off the main view's "Use Autolayout" flag in Interface Builder. Auto Layout is enabled by default when you create a new project.
First, make sure you have added your tagView into the view hierarchy by calling addSubview:. Secondly, do your animation in viewDidAppear:; otherwise, use animateWithDuration:delay:options:animations:completion: if you are going to do it in your viewDidLoad.
Related
We have this animation for some bubble effect on a button , but it prevent him from being clickable. if we disable this animation he works.
Can we fix it to let it work with the animation ?
CGRect initi=[[initialPositions objectAtIndex:b.tag] CGRectValue];
int r1=arc4random()%4;
int r2=arc4random()%4;
initi.origin.x+=r1;
initi.origin.y+=r2;
[UIView animateWithDuration:0.8 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut animations:^
{
b.frame=initi;
}
completion:^(BOOL completed){ }];
As far as I know, the button is not actually disabled or unclickable during the animation. When the animation starts the button's touch area is immediately moved to the position where the button will be when the animation ends. This makes it feel like the button were unclickable during the animation.
From touch logic's point of view, the button is just moved from A to B and animation between A and B is just eye candy. This explains why touching doesn't work between the points.
The only working solution to this is to roll your own animation routine. If you want to take this route, this post called The Holy Grail of iOS Animation Intervals? by Ben Bojko should point you to the right direction.
As Markus says in his answer (voted) the button actually moves to it's end position at the beginning of the animation, and will accept clicks there as soon as the animation starts. The animation actually takes place in view hierarchy's "presentation layer".
You can use Markus' suggestion of doing your own animation, but that is processor-intensive and not as smooth as layer-based animation (which is how UIView animation works under the covers.)
If you want to use UIView animation and have your button respond to clicks while the animation is in-flight then you need to make the superview that bounds the entire animation clickable, and implement hit testing on the button's presentation layer to figure out if the tap hits the button or not. (the superview takes the tap, then checks it's coordinates to see if it is inside the buttons' presentation layer using the hitTest: method.)
I have a project on github called iOS CAAnimationGroup demo (link) that shows how to do this, both for CAAnimation based animation and UIView-based animation.
UI animations are great, very easy to use, and are used allot. The only one problem I have with it is that while the animation is moving, the view in not receiving any user interaction.
For example, if a have a UIButton that animates every time it's shown, but the user will not be able to click on it until the animation is over.
//This is a UIButton:
- (void)animationApear
{
CGRect frameSelf = self.frame;
frameSelf.origin.y -= frameSelf.size.height;
[UIView animateWithDuration:1.0 delay:0
usingSpringWithDamping:0.8 initialSpringVelocity:0
options:0
animations:^{
[self setFrame:frameSelf];
} completion:nil];
}
Is there any way to deal with this issue?
Thanks!
You need to supply the option UIViewAnimationOptionAllowUserInteraction.
Also, depending on your view architecture, if the button is within the animated view, or a subview thereof, then the actual location of the button isn't moving. Only the presentation layer of the button is moving, so that is why the button may not be receiving taps. A good test is to tap where the button was when the animation started (and make sure the option UIViewAnimationOptionAllowUserInteraction is on) to see if it is still receiving taps.
On solution, when you actually need to animate buttons, is to make repeated short transforms (CGAffineTransforms, for example) and have those movements in aggregate, create the visual effect of the animation. Though in this case the button itself will move, rather than simply it's presentation.
I am currently developing an app that contains a music player. As of now it has a play, pause, & a select song button that shows the current song playing. Right now, the player is always on the screen. I want to make it so theres a button in the middle of the page so that when users click that, the whole media player with the play, pause, and select song button/icon will appear. When they click on that middle button again it shall hide those icons.
If anybody could point me in the right direction whether it be tutorials already out, or other discussions (I could not find any ones really) that would be awesome!
NOTE: I'm not trying to make the popover menu that facebook uses. This menu/audio player will expand/retract horizontally over the current view
Thank you in advance!!!!
Sounds like you need to look into the .hidden property of view objects (allows you to make views visible/not-visible), and possibly the ability to move views around on the screen with the .frame property (setting location, height/width).
Without some more detailed information about the effect you're trying to achieve, it's difficult to say more than that. If you use interface builder to set up the view/UI-objects you want to display, you can simply set the base view to hidden in interface builder and then when the user clicks your button set .hidden=NO for that view.
Note: to be able to show/hide everything as a unit like this, I'm assuming that you use a single UIView object in interface builder as the container (sized and placed where you want it) and then add your controller buttons as sub-objects inside that single view. This allows you to show/hide everything by just setting .hidden property for the containing view.
I'm not exactly sure what visual effect your looking for, but I think you already said it - just hide them.
You can do that a couple of ways.
One simple way is just to put those elements inside of their own view. Use a storyboard or xib file. Put your buttons and controls you want to hide show in a view.
Then create a reference in your view controller to that view. call it controlsView.
#property (strong,nonatomic) IBOutlet UIView *controlsView;
Make sure you connect that view.
Then when the button is pushed, just hide that entire view:
self.controlsView.hidden = YES;
When pushed again, show it:
self.controlsView.hidden = NO;
If you want a bit smoother look and feel, wrap it in an animation like this:
//to hide
[UIView animateWithDuration:2 animations:^{
[self.controlsView setAlpha:0];
} completion {
self.controlsView.hidden = YES;
}];
//to show
self.controlsView.alpha = 0;
self.controlsView.hidden = NO;
[UIView animateWithDuration:2 animations:^{
[self.controlsView setAlpha:1.0];
} completion {
}];
hope that helps
Part of my UIView is covering the iPad's keyboard.
The view you're seeing is simply a UIView I've added as a subview to my main view. When the keyboard is shown, I do shift the view up.
Has anyone ever seen this before?
EDIT
When the keyboard is shown, I move the view up:
[UIView animateWithDuration:SHOW_KEYBOARD_ANIMATION_DURATION animations:^{
CGRect frame = self.currentViewController.view.frame;
frame.origin.y -= SHOW_KEYBOARD_OFFSET;
self.currentViewController.view.frame = frame;
}];
EDIT
I use the follow code to add the view:
[UIView transitionFromView:fromView toView:toView duration:0.3f options:UIViewAnimationOptionTransitionCrossDissolve completion:nil];
Are you calling the code to move the view out of the way before or after the keyboard is displayed? In other words, are you registering for UIKeyboardWillShowNotification or UIKeyboardDidShowNotification?
I'm not sure where you are getting the keyboard size? Take a look at Apple's sample code again, see http://developer.apple.com/library/ios/#documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html, scroll down to the section on moving content that is located under the keyboard.
Where are you getting SHOW_KEYBOARD_OFFSET from? I bet that's the problem.
You should be catching the notifications, just as Kate said, and using the userInfo from them to work out what to do about moving your view around. Any hard coded values will break the second Apple change the keyboard size on you. In short, don't assume what the frameworks can so easily tell you.
I've built a UIControl subclass to display a 1-month calendar view on
an iPhone. Most months require 5 weeks to display the dates, but
some months need 6, so I've built the control to dynamically resize
itself as needed. I'm using UIView animation to change the frame of
the control here.
The problem is, I now need the other controls on the screen to
move/resize when the calendar changes size. And I really need that
to happen with the animation of the calendar control changing size.
Ideally, I'd do this without coding a bunch of details in my calendar
control about other controls on the screen.
What's the best strategy here? I was hoping I could somehow anchor
the other controls to the frame of the calendar control and have the
platform adjust their location/size as it animates the frame change.
But, thus far, I can't find any combination of struts and springs to
make that happen.
Do I just need to bite the bullet and add my other on-screen controls
to the animation happening inside my calendar control?
I'll be interested to see if there are better answers to this.
At this point, all I know to do is override setFrame on your calendar view and when it changes, send setNeedsLayout to its superview.
But I'm not sure if standard views will autoresize this correctly. Generally geometry flows down the view tree, not up, and you want it to do both.
You may have to implement layoutSubviews on the containing view.
Move the animation logic out of the specific view and into a view controller that manages all of the controls. The view can still figure out its own proper size, and let the view controller ask. For instance:
[self.calendarView setDate:date];
CGSize calendarSize = [self.calendarView sizeForDate:date];
[UIView animateWithDuration:...
animations:^{
... re-layout everything, including the calendarView ...
}];
Another, similar approach:
[self.calendarView setDate:date];
[UIView animateWithDuration:...
animations:^{
[self.calendarView sizeToFit];
... re-layout everything else ...
}];
There are lots of similar approaches based on your preferences. But the key is to move the logic out of the specific view. Usually a view controller is the best solution. If the controls make a logical collection that could go into a single UIView, then you could have that "collection" UIView manage the same thing in its layoutSubviews, but it's more common that a view controller is a better solution here.
Thanks for the help. I tried both of these approaches with success. The override of setFrame and implementation of layoutSubviews worked, but the other controls jumped to their new locations rather than animating to those locations as the calendar control grew.
The approach of moving the other controls during the animation is what I had to go with. However, I wanted to keep the logic of the control pretty self-contained for re-use, so I left the animation in the control but added a delegate to react to size change, and put the delegate call inside the animation block. In full disclosure, I am also animating the new month's calendar onto the control while I'm growing the control, and this way I could do both of those things in the animation block.
So, the end code looks something like this:
// inside the calendar control:
[UIView animateWithDuration:0.5 animations:^{
self.frame = newOverallFrame; // animate the growth of the control
_offScreenCalendar.frame = newOnScreenFrame; // animate new month on screen
_onScreenCalendar.frame = newOffScreenFrame; // animate old month off screen
if (self.delegate)
{
[self.delegate handleCalendarControlSizeChange:newOverallFrame]; // animate other controls per the delegate
}
}];