I have a animation in my navigationbased application.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown
forView:self.view cache:YES];
[UIImageView commitAnimations];
Directly after this bit of code i call
[self.navigationController popViewControllerAnimated:NO];
The thing is, I don't want to pop my ViewController before my animation is ready.
Set animations delegate and didStop selector and pop your view controller in that didStop method you specify:
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown
forView:self.view cache:YES];
[UIImageView commitAnimations];
Note, that didStop selector must be of the form specified in docs (see + setAnimationDidStopSelector method in docs for more details):
selector should be of the form: -
(void)animationDidStop:(NSString
*)animationID finished:(NSNumber *)finished context:(void *)context.
You can set a selector to be called when the animation is finished:
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
And in that selector call the pop the view controller.
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
// Pop the controller now
}
Related
I am using animation on a button click first time show a view and second ti me hide a view.
here is my code for hiding a view
-(IBAction)clickme
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[view1 setAlpha:0.0];
[UIView commitAnimations];
}
similar code is there for showing the view.
But the problem arises when user click the button many times again and again....means i am using 2 seconds for my animation but if user presses the same button in during the animation then the output result is very bad.
I don't want to disable that button during the period of animation.
Is there any other way?
You need to keep track of whether there's an animation going on, and ignore the click if it is.
Declare an instance variable BOOL animating; in your class header, and initialise it to NO in your init.
Then,
-(IBAction)clickme
{
if (animating) return;
animating = YES;
[UIView beginAnimations:nil context:self];
[UIView setAnimationDuration:0.3];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[view1 setAlpha:0.0];
[UIView commitAnimations];
}
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
if (context == self)
animating = NO;
}
try to use + (void)setAnimationBeginsFromCurrentState:(BOOL)fromCurrentState:
-(IBAction)clickme
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[view1 setAlpha:0.0];
[UIView commitAnimations];
}
I have put a line of code inside the UIAnimation block. And the next line comes after the animation block. I want the second line only to be executed after the time interval of the first animation block.
Eg:-
[UIView beginAnimations:#"View Flip" context:nil];
[UIView setAnimationDuration:0.5];
//First line comes here
[self.view addSubview:subView];
[UIView commitAnimations];
Then the 2nd line
[subView2 removeFromSuperView];
I want the 2nd line only to be executed after the 0.5 second interval of the animation action. Is it possible to do like this?
You can set a delegate for animation and remove subview in its method:
...
[UIView beginAnimations:#"View Flip" context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
[UIView setAnimationDelegate:self];
//First line comes here
[self.view addSubview:subView];
[UIView commitAnimations];
...
Then in delegate's animation did stop handler remove your 2nd subview:
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context{
if ([finished boolValue])
[subView2 removeFromSuperview];
}
I have a simple animation which simply modify the position of a button:
[UIView beginAnimation:nil context:nil];
[UIView setAnimationsDuration:3.0];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
mybutton.frame = CGREctMake(20, 233, 280, 46);
[UIView commitAnimations];
I want to perform some other animations when this one is finish, how to do that?
You could look at setAnimationBeginsFromCurrentState:. All the animations are run in their own threads, so [UIView commitAnimations] is a nonblocking call. So, if you begin another animation immediately after committing the first one, after appropriately setting whether or not it begins from the current state, I think you'll get the behavior you want. To wit:
[UIView beginAnimation:nil context:nil];
// set up the first animation
[UIView commitAnimations];
[UIView beginAnimation:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:NO];
// set up the second animation
[UIView commitAnimations];
Alternately, you could provide a callback by doing something like
[UIView beginAnimation:nil context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)
// set up the first animation
[UIView commitAnimations];
//...
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
// set up the second animation here
}
a code segment for getting start.. setup initial (the first) animation:
- (void) aniPath:(AnimationPath *) path
{
[UIView beginAnimations:path->aniname context:path];
[UIView setAnimationDuration:path->interval];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(aniDone:finished:context:)];
// your initial animation
[UIView commitAnimations];
}
chains to another animation when the first is done:
- (void) aniDone:(NSString *) aniname finished:(BOOL) finished context:(void *) context
{
AnimationPath *path = (AnimationPath *) context;
if ([aniname isEqualToString:path->aniname]) {
[UIView beginAnimations:path->aniname context:context];
[UIView setAnimationDuration:path->interval];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(aniDone:finished:context:)];
// more animations, even recursively
[UIView commitAnimations];
}
}
Use the +[UIVIew setAnimationDelegate:] and +[UIView setAnimationDidStopSelector:] methods to configure your class to receive a message when the animation ends.
it quite easier.
you can just
- (void)animationDidContiune:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
UIView *currentObj = context;
[self callTheAnimation: currentObj];
}
you can easily loop the animation.
To end it - I would create an animationDidEnded and use it instead of animationDidContiune
once you want to stop it (like simple if in animation that chooses either to contiune or end).
HF.
AND WHAT's IMPORTANT:
use this type of animating meths:
- (void)callTheAnimation:(UIView*)itemView
{
[UIView beginAnimations:#"animation" context:itemView];
.
.
.
}
they are quite flexible - you can animate whatever here due to hierarchy of the objects.
I'm using some pretty standard code to flip 2 UIImageViews that are inside a small view.
(I'm amazed it worked!)
But what if I had THREE UIImageViews inside a small view... and wanted to flip between all 3?
I thought I could just cut/paste 2 copies of my code... but I guess not.
When I try to flip 1>2.. and then 2>3... it just flips once... going directly from 1>3.
What happened to 2????
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:myView cache:YES];
[image1 removeFromSuperview];
[myView addSubview:image2];
[UIView commitAnimations];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:myView cache:YES];
[image2 removeFromSuperview];
[myView addSubview:image3];
[UIView commitAnimations];
The animations are not chained together like this. Basically, they are doing both animations at the same time. What you want is to create a new method for the second flip that will be called after the first one is done:
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)contextn {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:myView cache:YES];
[image2 removeFromSuperview];
[myView addSubview:image3];
[UIView commitAnimations];
}
Then in your existing method, put this line:
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
like so:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:myView cache:YES];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
[image1 removeFromSuperview];
[myView addSubview:image2];
[UIView commitAnimations];
For more info, check the apple docs
You could set a 0.5 second delay on the start of the second animation.
Also, you may want to check out keyframe animations to do more advanced stuff like this.
Jill,
In your second code block, do the following.
[UIView beginAnimations:nil context:NULL];
// This will cause your second animation block to wait 0.5 second, which will be
// enough time for the second one to kick in and do it's thing.
[UIView setAnimationDelay:0.5];
[UIView setAnimationDuration:0.5];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:myView cache:YES];
[image2 removeFromSuperview];
[myView addSubview:image3];
[UIView commitAnimations];
I'm trying to do a multistage animation, so that a UIImageView (1) fades in, (2) moves, (3) slide off the screen.
Only stage 1 seems to work. What am I doing wrong? Here's the code:
// FIRST PART - FADE IN
-(void)firstAnim
{
// 'sprite' is a UIImageView
[sprite setAlpha:0.1f];
[UIView beginAnimations:#"anim1" context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.25];
[UIView setAnimationDidStopSelector:#selector(secondAnim)];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[sprite setAlpha:1.0f];
[UIView commitAnimations];
}
// SECOND PART - MOVE
-(void)secondAnim
{
[UIView beginAnimations:#"anim2" context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDidStopSelector:#selector(thirdAnim)];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
sprite.frame = CGRectMake(170, 184, 20, 20);
[UIView commitAnimations];
}
// THIRD PART - SLIDE OFF SCREEN
-(void)thirdAnim
{
[UIView beginAnimations:#"anim3" context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
sprite.frame = CGRectMake(170, 420, 20, 20);
[UIView commitAnimations];
}
You need to add a call to set yourself as the animation delegate:
[UIView setAnimationDelegate:self];
It would be a good idea to unset yourself as the delegate (set to nil) in the last animation block.
The complete solution to your question is:
1) set the animation delegate
2) use the correct selector and method signature
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:.5];
[UIView setAnimationDelegate:self]; //set delegate!
[UIView setAnimationDidStopSelector:
#selector(secondAnim:finished:context:)];
-(void)secondAnim:(NSString *)animationID
finished:(NSNumber *)finished
context:(void *)context {
//animation #2
}