I'm using the code below to animate UITableView height change in response to keyboard appearing/disappearing.
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.25];
[UIView setAnimationBeginsFromCurrentState:YES];
CGRect tableFrame = self.messagesTableView.frame;
if (UIInterfaceOrientationIsPortrait(self.interfaceOrientation)) {
tableFrame.size.height -= kKeyboardHeightPortrait;
} else {
tableFrame.size.height -= kKeyboardHeightLandscape;
}
self.messagesTableView.frame = tableFrame;
[UIView commitAnimations];
It's working as expected except for one thing, as soon as the animation starts, the cells in the upper half of the table view disappear.
Before animation starts:
After animation starts:
It's also worth mentioning that the table view is an instance of UIBubbleTableView
I've tried to reproduce your issue, but could not. In any case I have just submitted extended example of UIBubbleTableView into github which does the thing you are trying to do and everything seems good so far, take a look at the latest commit (https://github.com/AlexBarinov/UIBubbleTableView/commit/bc0dc5b151241c4ae476c894e23800156e9709a8)
If you still have questions feel free to add issues into github tracker or contact me to provide the source you think does not work for investigation. Email is available in github profile.
That's because you never initialize those cells.
Related
In our question module I need to resize and animate UIView when user clicked answers which are represented by tableview. I have read some related questions and applied their solution but none of them worked for me.
The problem is uiview doesn't appear at first click but if user click same answers 2 times or more it appears because in second click on same answers does not change the frame.
so basically if the feedback of answer change, height of the uiview gonna be recalculated and I guess it is blocking animation.
my view hierarchy:
http://i.imgur.com/Oho6Hob.png
method which changes the constraints of views and textview:
self.feedbackLabelWrapperHeight.constant = height + 45;
self.feedbackViewHeight.constant = height + 45 + 12;
int y = height;
[self.feedbackView setFrame:CGRectMake(50,self.scrollView.frame.size.height + self.scrollView.frame.origin.y -(y+40),self.feedbackView.frame.size.width,(y+40))];
animation method:
[UIView beginAnimations:#"feedback" context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.2];
[UIView setAnimationDelay:delay];
[self.view layoutIfNeeded];
[UIView commitAnimations];
self.isFeedbackViewVisiable = YES;
I'm calling these two methods in didSelectRowAtIndexPath method in these order:
and labelHeightOfResponse parameter is the calculated height of related label or textview
[self setFeedbackConstraintHeight:labelHeightOfResponse];
[self feedbackViewAppearAnimationWithDelay:0.2 yPosition:labelHeightOfResponse];
I would really appreciate help here.
Thanks!
after spending a week I've added a constraint which does nothing. I don't know why but it solved animation blocking furthermore it worked perfectly even I deleted layoutIfNeeded.
I've been searching around SO and have found some related posts, but none that have (yet) solved my problem.
I have a view setup in my storyboard, with a constraint hooked up through an IBOulet. Upon a certain action, the view should move up (or down to it's initial position). For the life of me, I cannot get it to work properly. Prior to autolayout, I ran this bit of code:
- (void)animateStarBackground:(NSString *)animationID
finished:(NSNumber *)finished
context:(void *)context
myView:(UIView *)myView
xPos:(float)xPos
yPos:(float)yPos {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.2];
[UIView setAnimationDelay:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDelegate:self];
myView.center = CGPointMake(xPos, yPos);
[UIView commitAnimations];
}
It used to work great, but anyway... we all know that this doesn't work in Autolayout anymore. So I changed it to the following:
-(void)animateButton:(UIView *)myView {
[UIView animateWithDuration:8.0f animations:^{
_viewConstA.constant = 45.0;
[myView layoutIfNeeded];
}];
}
When the action occurs, instead of starting in it's initial position as set in the Storyboard, it starts off as a 1x1 pixel view in the top left hand corner and animates downward into it's final resting place (instead of moving up 15 pixels as I had intended it to).
Now, if I take out the [myView layoutIfNeeded]; portion, the action positions the view in exactly the right place... BUT it doesn't animate there. It's just instantly there as the view appears.
The first screen grab is the initial location.
2nd grab is what's supposed to be the views final resting place.
3rd is the view animating from the wrong spot and direction.
Thoughts / comments? What the heck am I doing wrong? I thought this would be so easy... I've got to be missing something obvious.
When I call the following block-based animation from viewDidLoad, it animates the frame from CGRectZero to the final location. But if I call this from viewDidAppear, it works just as expected.
- (void)animateMovementByConstraint
{
[UIView animateWithDuration:0.5
animations:^{
self.topLayoutConstraint.constant = 100;
[self.view layoutIfNeeded];
}];
}
(In this example, topLayoutConstraint is an IBOutlet that I defined in Interface Builder for the top vertical constraint on the control that I wanted to animate.)
With auto layout, since I've started initiating my animations in viewDidAppear, I haven't had any problems.
I have a tabbed application for iPad. On the first tab I have a separate menu with a pointer that highlights the currently active menu button. The pointer (a UIImage) is animated into position after tapping the button.
The problem is when you leave the highlighted image on any button that's not the original/default button and move to another tab in the application, then back again, the image has moved back to the default location. However, when you tap another button the image moves in the wrong direction. I think it's because the image moves back but the old coordinates are retained, or the other way around? It's a bit hit and miss and behaves differently testing in the simulator compared to directly on the iPad.
I think I need to start with absolute coordinates and stick with them throughout the process. But I can't get my head around how to achieve it with the CGAffine functions.
Here is my current code
- (IBAction)diplayForm1:(id)sender {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
buttonHighlightImage.transform = CGAffineTransformMakeTranslation(0, 0);
[UIView commitAnimations];
}
- (IBAction)diplayForm2:(id)sender {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
buttonHighlightImage.transform = CGAffineTransformMakeTranslation(0, 80);
[UIView commitAnimations];
}
- (IBAction)diplayForm3:(id)sender {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
buttonHighlightImage.transform = CGAffineTransformMakeTranslation(0, 160);
[UIView commitAnimations];
}
EDIT - - -
#Mundi I tried the code you suggested. I'm assuming by newFrame you mean define a new UIImageView and property which I did in the .h (I called it 'sfh'), then #synthesize in the .m.
This is my code in the .m
-(void)viewWillAppear:(BOOL)animated {
// The "pointer" and the "old" frame are the same so I thought it pointless to do
// selectedFormHighlight.frame = selectedFormHighlight.frame;
// I tried anyway and also tried this and many other combinations
selectedFormHighlight.frame = sfh.frame;
}
-(void)viewDidAppear:(BOOL)animated {
[UIView beginAnimations:nil context:NULL];
[UIView animateWithDuration:0.3 animations:^{
selectedFormHighlight.frame = CGRectMake(0,0,0,0);
}];
[UIView commitAnimations];
}
When I run this the pointer animates off the screen (top-left) and doesn't come back. I have tried every possible combination I can think of in viewWillAppear and viewDidAppear but it makes no difference. I tried removing the other lines in viewDidAppear and it still does the same thing.
I think you're suggesting to animate the pointer from the original (default) position when the user returns from another screen. I don't want that, it should simply remain in the same spot where they left it without animation. Or at least put it back there without them realizing it. The only animation is when they choose to tap a different button within that view.
The reason you are experiencing this is that the actual view object and its presentation layer get mixed up when the view is hidden and redisplayed. The solution is to change the view properties rather than animate the layers.
Thus, you do not need to use affine transforms. Just set the new position of the pointer view directly by changing its frame or center.
The more up-to-date format to do this is with block based animations:
[UIView animateWithDuration:0.5 animations:^{
pointer.frame = newFrame;
}];
Also, it seems very inefficient to have three methods just differing by one variable. You could just multiply the desired y position by 80.
Edit:
Another reason your button resets is because that is where it was put when the view is instantiated. Just set the position of your view in viewWillAppear of your view controller and then animate it to the new location in viewDidAppear.
I appreciate the help from #Mundi but couldn't get it to work that way. I eventually arrived at the following code.
// This initially sets the frame with a variable value that
// corresponds to the current child view
-(void)viewDidAppear:(BOOL)animated {
selectedFormHighlight.frame = CGRectMake(0, self.getY, 250, 4100);
}
// Button actions (converted to a single action instead of one for each button)
// This was done by referencing a tag added to each button (the button tags
// match the children's tags)
-(IBAction)goToForm:(id)sender {
UIButton *btn = (UIButton *)sender;
self.currentChild = self.formViewControllers[btn.tag];
[UIView beginAnimations.nil context:NULL];
[UIView animateWithDuration:0.3 animations:^{
selectedFormHighlight.frame = CGRectMake(0, self.getY, 250, 4100);
}];
[UIView commitAnimations];
sfh.frame = selectedFormHighlight.frame;
}
// This returns the 'y' (vertical center position) of the pointer
// frame for each of the child views
-(int)getY {
switch(_currentChild.view.tag) {
case 1:
return -2005;
break;
case 2:
return -1925;
break;
default:
return -1845;
break;
}
}
I have two UIImageView filling the view controller, the first is filling the top half, and the second for the bottom half. I set them directly in the storyboard file.
In the viewDidLoad method, i am setting code in order to perform animation for the two UIImageView, so that it will look like a basket which gets opened (the first UIImageView moved to the top until it gets out of the view, and the second UIImageView moved to the bottom of the view until it gets out of the view).
This is my code so far:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
CGRect basketTopFrame = self.basketTop.frame;
basketTopFrame.origin.y = -basketTopFrame.size.height;
CGRect basketBottomFrame = self.basketBottom.frame;
basketBottomFrame.origin.y = self.view.bounds.size.height;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelay:1.0];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
self.basketTop.frame = basketTopFrame;
self.basketBottom.frame = basketBottomFrame;
[UIView commitAnimations];
}
But the behavior is different than i was expecting, the top frame is not moving, and the bottom frame is animated from top left to bottom (origin position, and not moving out of the view).
This is UIImageViews position as i set in the storyboard:
This is the UIImageViews when i launch the app:
And this is the UIImageViews when the app finish the animation(viewDidLoad):
Please note that this code works in Xcode 4.2, but since upgrading to Xcode 4.5 and using Storyboard, i begin getting this issue. Thanx in advance.
You may have auto layout enabled on your storyboard. In this case the view components will not have a valid frame value at viewDidLoad, so your code won't work.
You can disable auto layout by selecting the file inspector in the storyboard and unchecking "Use Autolayout".
In any case, that is the wrong method to be starting an animation from. Try moving the code to viewDidAppear.
Once you have "AutoLayout" turned off and if you are targeting IOS 4 and later than block based UIView animation is recommended by Apple as it simplifies the process and you can do things in one line. Please check UIView Reference for further information.
In your case , whether you plan to do the animation in ViewDidLoad / ViewWillAppear, it can be done in the following way using block based animation:
CGRect basketTopFrame = self.boxTop.frame;
CGRect basketBottomFrame = self.boxBottom.frame;
[UIView animateWithDuration: 0.5 delay:0.1 options:UIViewAnimationOptionCurveEaseOut animations:^{
[self.boxTop setFrame:CGRectMake(basketTopFrame.origin.x, -basketTopFrame.size.height, basketTopFrame.size.width, basketTopFrame.size.height)];
[self.boxBottom setFrame:CGRectMake(basketBottomFrame.origin.x, self.view.bounds.size.height, basketBottomFrame.size.width, basketBottomFrame.size.height)];
} completion:^(BOOL finished) {
// TODO : Do any additional stuffs.
}];
I have been trying to build an entry effect for a logo to come from the top of the screen to the bottom and remain there when a new view loads in my application. I have seen all of the tutorials that use NSTimer to bounce an image but once my logo hits the bottom it needs to exit. I'm going to read up on animation block codes to see if my solution resides there.
Apologies I'm a new be and am very grateful for the assistance.
Set logo frame to top and then:
[UIView beginAnimations: #"moveLogo" context: nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:1.0];
[UIView setAnimationCurve: UIViewAnimationCurveLinear];
logoToMove.frame = CGRectMake( final frame at the bottom );
[UIView commitAnimations];
logoToMove is your logo, give it an outlet and hook it in xib.
So you will set the initial frame and in the animation - the final frame. The animation will do the rest of the job.
Change UIViewAnimationCurveLinear to a desired one if you don't like that. Also the duration to speed up or slow down the movement.
To remove the view at the end of your animation, the easiest way would be to use blocks :
logoToMove.frame = topRect;
[UIView animateWithDuration:duration
animations:^{
logoToMove.frame = bottomFrame;
}
completion:^(BOOL finished) {
[logoToMove removeFromSuperview];
}
];
Doing it like that gives you control over the animation and on what to do once it's finished in a single method