I have a custom view that has to track the user's location. I put the following code in touchesBegan, as well as in touchesMoved:
[UIView animateWithDuration:0.2 delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
cursorView.center = locationOfTouch;
} completion:^(BOOL finished){}];
It seems fairly straightforward to me. I'd expect the view to always animate to the user's current location, even if that location is changed and the view is still animating (because of the beginFromCurrentState option).
Yet, each animation finishes completely. They don't 'transition' to the new animation, no they finish first, then they start the new animation.
I tried adding this line in touchesMoved:
[cursorView.layer removeAllAnimations];
Doesn't do anything. No animation is cancelled. Any ideas?
with [cursorView.layer removeAllAnimations]; you access the layer of the view but you have set the animation not to the layer but the view directly.
Try:
[UIView beginAnimations:nil context:NULL]
[UIView setAnimationDuration:0.2];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
cursorView.center = locationOfTouch;
[UIView commitAnimations];
and leave out the removeAllAnimations and it should transition from current state.
Looks like this is a derivative of another question you asked that I just answered, but the same idea applies.
You don't need to use blocks to do this. Just wrap your setCenter in a UIView animation. Like this:
[UIView beginAnimations:nil context:NULL]
[UIView setAnimationDuration:0.2f];
cursorView.center = locationOfTouch;
[UIView commitAnimations];
Keep in mind that 0.2 seconds is pretty fast. It may appear to be "jumping" to the position. To confirm, set the duration to something like 2.0 seconds and see if it's animating.
Best regards.
Technically, the view should automatically animate with a default time of 0.25 seconds. That is what the manuals say, however, I'm currently on here because the manuals don't seem to be very accurate regarding animation.
Also, the beginAnimations call is being phased out, you might want to use a CATransaction instead
Related
I am using UIView animation in my app:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1];
//do some animation
[UIView commitAnimations];
Now, there is a possibility that the animation would take a couple of seconds to finish. So, is there a way to know when the animation has ended?
Use the latest block-based animation methods provided by apple as:
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
//animation block
}
completion:^(BOOL finished){//this block starts only when
//the animation in the upper block ends
//so you know when exactly the animation ends
}];
The method you have used will be deprecated soon...
I haven't uses this myself yet, but there is a method setAnimationDidStopSelector that allows you to define a selector that should be called when an animation has finished.
Also see the documentation at Apple for UIView.
There is also an example on Ray Wenderlich's site
I need to perform 9 animations where each animation starts after previous one. So I have huge gigantic piece of code with UIView animateWithDuration calls. It really looks ugly :) Is there any better options than making 8 additional methods and nesting them?
Core Animation is your friend.
http://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CoreAnimation_guide/Introduction/Introduction.html
Or you can write all of these 9 steps into one method by using block-based animation method. But it still dosen't look beautiful and iOS 4 is requied.
You can still use the UIView animation or coreanimation and use the delegate call back i.e:
[UIView beginAnimations:#"fadeIn" context:nil];
[UIView setAnimationDuration:0.3];
[UIView setAnimationDidStopSelector:#selector(finishAnimation:finished:context:)];
[UIView setAnimationDelegate:self];
theview.alpha = 1;
[UIView commitAnimations];
then in the finishAnimation method you can call another animation.
I noticed in the Jamie Oliver app, when you click one of the buttons, it goes from one size to another in a smooth transition. Does anyone know how this is done? I tried using some of the UIView animations, but none of them satisfies my needs.
UIAnimations alone can not give you that effect.. You need to couple them with transformations to achieve the effect that you are talking about. Try it in the following way. You will get what you need...
[UIView beginAnimations:#"Zoomin" context:nil];
[UIView setAnimationDuration:0.25];
starImage.transform=CGAffineTransformMakeScale(2.5, 2.5);
[UIView commitAnimations];
[UIView beginAnimations:#"Zoomout" context:nil];
[UIView setAnimationDuration:0.25];
starImage.transform=CGAffineTransformMakeScale(1, 1);
[UIView commitAnimations];
I believe animation blocks are the preferred method for animating views now.
I have made a UIImageView, added it to the subview, and plan to animate it. I am using the setAnimationDidStopSelector method and was wondering if I could get it to call a function 3 or so seconds after the animation stops.
Here is the current line of code I am using:
[UIView setAnimationDidStopSelector:#selector(onAnimationComplete:finished:context:)];
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
Thanks.
From your animationDidStopSelector method you can call another method using performSelector:withObject:afterDelay:.
I've animated moving a UIView as follows:
CGRect rightPop = CGRectMake(167, 270, 142, 73);
[UIView beginAnimations:nil context:NULL];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.4];
[rightToast setFrame:rightPop];
[UIView commitAnimations];
The animation occurs just fine, but it causes other parts of the app to become animated (eg, navigation bars etc).
Does anyone know how I can stop the other animations?
It's happening because animation blocks can be nested. You're opening two of them via beginAnimations, but only closing one via commitAnimations. The second animation block is still open, so extra animations are not surprising. I don't know why you're calling beginAnimations twice, it's not necessary. Drop that and things should work normally.