[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.30f];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:viewSettings cache:YES];
viewSettings.alpha = 0;
[viewSettings removeFromSuperview];
[UIView commitAnimations];
I ve written the code above that works well when I add the view via animation, but it doesn't work when i remove the view from superview. Animation works if I remove [viewSettings removeFromSuperview] line. I don't know where I'm doing wrong.
You need to remove it from the superview after the animation has completed. This is very easy to accomplish if you use the blocks based API, which Apple is encouraging you to do:
[UIView transitionWithView:viewSettings
duration:0.30f
options:UIViewAnimationOptionTransitionNone
animations:^{
[viewSettings setAlpha:0];
} completion:^(BOOL finished) {
[viewSettings removeFromSuperview];
}];
You can read about all the options in Apple's documentation.
removeFromSuperview is not an animatable action, so it is getting performed immediately. Once you commitAnimations, your view is no longer part of it's superview, so you can't see the animation, if it is still even happening.
If you want your animation to happen, then the view to get removed, call removeFromSuperview when the animation ends, such as in a selector specified with setAnimationDidStopSelector:.
Try removing view after the animation is completed. Initially alpha value of the view is 1 then, you apply the animation and make it 0. Now the view is still there but it is not visible. Once the animation is over then remove the view. I think it should work.
I think viewSettings is removed before you commit the animation.
Try inverting the two last lines.
Related
I am animating UIView when user touches on custom dropdown to show picker View from bottom side.UIView contains Pickerview...so when I change it's frame to move upwards.I get what I want, but pickerView doesn't recognize touch !(see screenshot below)
code is like this
CGRect pickerFrame=self.pickerSheet.frame;
CGRect viewFrame=self.view.frame;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:SHEET_ANIMATION_DURATION];
//change Frame of View containing UIPickerView
pickerFrame.origin.y=202+animatedDistance;
viewFrame.origin.y-=animatedDistance;//animated distance is value by which view needs to move upward.
[self.pickerSheet setFrame:pickerFrame];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
screenshot
first of all, ++please**, stop using this animation declaration, and bedin use new, block animation:
[UIView animateWithDuration:SHEET_ANIMATION_DURATION
delay:0
options:nil
animations:^{
pickerFrame.origin.y=202+animatedDistance;
viewFrame.origin.y-=animatedDistance;
}
completion:^(BOO f){
//any actions after animation ended
}];
Second, I think your problem is somewhere else. May by, you implementing your touches or picker wrong.
Please start using the new , better animation block , but I think there is something missing in your code , you need to put the code below :
UIViewAnimationOptionAllowUserInteraction
Put this code in options in the new animation block , or find a way to put it in the old animation block
I have a subView that I want to toggle between hidden and not hidden by a button. How do I fade in the subview and fade it out? For now it just appears immediately and disappear immediately when I toggle the button.
I am wondering what is the easiest way to do this animation.
Thanks
On iOS 4.0+ Apple recommends you use their new, block-based animation methods. Using these, the code would look something like this:
[UIView animateWithDuration:2.0
animations:^{myView.alpha = 0.0;}];
The properties you are animating go inside the block (the ^{...} part). Blocks are sort of like functions, so you can put multiple lines of code inside of them, if you want to animate multiple properties. For example:
[UIView animateWithDuration:0.2
animations:^{
view.alpha = 0.0;
view.backgroundColor = [UIColor redColor];
}];
If you need to perform an action after the animation is complete, use the +animateWithDuration:animations:completion: method (which also uses blocks), for example:
[UIView animateWithDuration:0.2
animations:^{view.alpha = 0.0;}
completion:^(BOOL finished){ [view removeFromSuperview]; }];
For more info, check out the UIView Class Reference 'Animations' section and 'Animating Views with Blocks' section.
This is the old pre-4.0 way:
http://objcolumnist.com/2009/07/18/simple-uiview-based-animations-on-the-iphone/
... which has the advantage of being conceptually simple and easy to implement.
float alpha = 1.0; // or 0.0 if it's already visible and you want to fade out
[UIView beginAnimations:#"" context:NULL];
[UIView setAnimationDuration:2.0]; // seconds, not ms. guess how i know?
[mySubView setAlpha:alpha];
[UIView commitAnimations];
this feels like a beginner question, but since I am not able to get it working in the intended-fashion, I am hoping somewhere out there is able to point me in the right direction.
What I am trying to achive is a transition of a view inside a view.
I fundamentally want to replace a view inside a view with another view(controller?!?) 's content.
lets say, I have an image of a book and I want to do a transition inside the book to another page (going from the calendar-view to the detailed daily view for example). I only want the "book-content"(white content area) to be included in that transition, and not the whole book itself(whole screen).
I can do a transition with the same view, no problem, but I dont get it working trying to replace the view with a completly different view.
It didnt matter having the views in seperate viewcontrollers, or all the views in one viewcontroller, so I were not able to get it working yet, but even worse, I am running out of ideas.
So HELP! If please somebody out there could be so kind and tell me what I am doing wrong.
Suggestions also very much appreciated.
Thanks!!
Tom
Maybe you could hide one view then show the other using a UIView Animations block.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:view1.view cache:YES];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:view2.view cache:YES];
[UIView setAnimationDuration: 1.5];
[UIView commitAnimations];
view1.view.hidden = YES;
view2.view.hidden = NO;
Edit: Is this what you were looking for?
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
[view1 viewWillDisappear:YES];
[view2 viewWillAppear:YES];
view1.view.hidden = YES;
view2.view.hidden = NO;
[view1 viewDidDisappear:YES];
[view2 viewDidAppear:YES];
[UIView commitAnimations];
Or, you could use something like this:
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionTransitionFlipFromRight
animations:^{
[view1 removeFromSuperview];
[mySuperview addSubview:view2];
}
completion:nil];
Check out the exchangeSubviewsAtIndex: method in the UIView class. Just set up the 2 views that you want to transition from and to as subviews of another view; then call this method on that parent view.
Suppose you have a view controller with two views, A and B. They have identical frames so they occupy the same space in the controller's view, for your purposes displaying a page of a book. You want to display one and transition to the other.
One way would be to set the alpha property of one to 1.0 (opaque) and the other to 0.0 (transparent). Because this property can be animated you could do a fade from one to the other using a beginAnimations:context/commitAnimations, or use one of the block methods like the docs advise.
Another way would be to animate a change in frame in the two views. Set up the views so that one has a frame such that it is in the right place to display, the other has the same frame but with frame.origin.x equal to frame.size.width - it will be hidden because it is off-screen or hidden behind some other view. Animate the frame in by setting view A's frame.origin.x to -frame.size.width and frame B's frame.origin.x to the display position x origin. Then set (no animation) frame A's frame.origin.x to frame.origin.width again, update its content and you are ready to slide another page in from the right.
I wan't to perform an animation before quitting a view. The problem is that if I write this code:
[self animationMethod];
[self removeFromSuperview];
the animation is not presented because the removeFromSuperview instruction is immediatly executed, i suppose.
There's a way to specify thath the removeFromSuperview method must be executed after a a specified time? thanks.
Does animationMethod use a [UIView beginAnimations: context:] section? If that's the case, you should use the animation delegate. Specifically:
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(removeFromSuperview)];
//Your animation stuff
[UIView commitAnimations];
Otherwise, if you're doing something else that doesn't have a callback, you can call the method after a delay using:
[self performSelector:#selector(removeFromSuperview) withObject:nil afterDelay:0.25f];
where 0.25f is the delay you want to use. I chose 0.25 because that is the default animation length for animation blocks (as shown above).
I tried to add a animation to viewDidLoad and viewDidAppear, but it doesn't work:
- (void)viewDidAppear:(BOOL)animated{
[UIView beginAnimations:#"transition" context:NULL];
[UIView setAnimationTransition:110 forView:self.view cache:YES];
[UIView commitAnimations];
}
Why?
I had the same problem and I think I found the solution on this SO question.
When viewDidAppear gets called you still don't see anything on the screen (despite the name), but you are about to. You can then use a performSelector:withDelay or an NSTimer to launch your animation. The delay can just be 0.1 and your animation will play just when the screen appears.
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSLog(#"View did appear!");
[self performSelector:#selector(animationCode) withObject:nil afterDelay:0.1f];
}
- (void)animationCode {
// you animation code
}
You are not telling the view which state it should animate to so it won't do anything. You need to place code between beginAnimations:context: and commitAnimations that changes the appearance of the view (e.g. by removing one subview and adding another).
You're not using beginAnimations: and commitAnimations correctly. You're supposed to put something in between them that normally wouldn't be animated: e.g. with self.view.alpha = 0.5 you get a fading effect. They have no effect on anything that isn't between them.
By the time viewDidAppear: is called, your view, well... has appeared. It's too late to animate anything. What you actually want to do is something like this:
- (void)showMyViewWithAnimation {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationTransition:110 forView:childView cache:YES];
[parentView addSubview:childView];
[UIView commitAnimations];
}
In the example above, childView is what in your example is called self.view.
Please write out the name of the transition; no one knows what 110 is by looking at it. It's bad style. </pedantry>