My problem is as follows:
An UIImageView's view is going to be changed with an animation, like this:
[UIView transitionWithView:_backgroundArtworkImageView
duration:ANIMATION_DURATION
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
_backgroundArtworkImageView.image = blurredImage;
}
completion:nil];
It works perfectly fine as long as I don't have an UIVisualEffectView over the image view. If using the blur view on top, it results in no animation at all.
I've looked around for a bit and seen that snapshots of views could be something to look into, which also seems to be what Apple uses internally on iOS, for example when bringing up the app switcher; I'm not really sure how exactly to approach it though.
Got it working by taking a snapshot, append it to the superview, hide the real view, change it without animation and then fade the real view in with animation.
__block UIView *snapshot = [_backgroundArtworkImageView snapshotViewAfterScreenUpdates:NO];
[_artworkContainer insertSubview:snapshot belowSubview:_backgroundArtworkImageView];
_backgroundArtworkImageView.alpha = 0.0f;
_backgroundArtworkImageView.image = blurredImage;
[UIView transitionWithView:_artworkContainer
duration:ANIMATION_DURATION
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
_backgroundArtworkImageView.alpha = 1.0f;
}
completion:^(BOOL _) {
[snapshot removeFromSuperview];
snapshot = nil;
}];
Edit: I realized that the blur view was taking a small time to update, but to solve that a new snapshot of the resulting view could be taken and then animated with.
Related
I have A class inheriting from UIImageView. Then I have the NSArray containing the the object of the A class containing some pictures. Then I just want to add to the Main view (self.view addSubview: "object of Aclass") and remove some of them. I would keep doing that for a certain amount of time. Here is question. When i do "add" and "remove" the UIImageView (A class object) with some Animation like when I add, the UIImageView goes from small to its original size and when i remove, it goes from its original size to smaller
-(void)displayAClassObject: {
[self.view addSubview: AClassObject];
AClassObject.transform = CGAffineTransformMakeScale(0.3, 0.3);
[UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ AClassObject.transform = CGAffineTransformIdentity; } completion:^(BOOL finished) { }];
}
Then some function will generate random Number to remove the AClassObject added in the Main view.
-(void)displayOffAClassObject {
[UIView animateWithDuration:0.1 animations:^{AClassObject.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.1, 0.1);} completion:^(BOOL finished){[AClassObject removeFromSuperview]; }];
[AClassObject removeFromSuperview];
}
when i add again the removed AClassObject to the main view, i set it with different frame to place it in different place in the Main view but i do not change its size.
This process keeps going per a second but when I add only or remove only, It works fine. The AClassObject goes from small to its original size and then its original size to small. but when i do both at the same time like [self displayOffAClassObject]; [self displayAClassObject];
The UIImageView (AClassObject) goes really big, even some of the image goes off the screen. Can anyone tell me what is wrong?? or any suggestion to fix it?
When you do transform (especially scale transform), .frame become invalid. Set AClassObject.transform = CGAffineTransformIdentity before setting its frame. If you want to set its position when .transform is not identity, set .center instead.
Cited from UIView documentation:
WARNING
If this property (.transform) is not the identity transform, the value of the frame property is undefined and therefore should be ignored.
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instp/UIView/transform
I have implemented a custom segue class for emulating the push transition without navigation bar. The trick is to take to snapshots, add them to the view, replace the viewController, move the snapshots, and finally remove them. This emules a horizontal movement of the viewController, but actually only two UIImagesView are moved.
The following code implements this.
self.destinationImageView.frame = offsetFrameD;
self.sourceImageView.frame = offsetFrameS;
//ViewController replacement
[self.sourceViewController presentModalViewController:self.destinationViewController animated:NO];
//Overpose the snapShot who will simulate the transition between vies.
[destinationView addSubview: self.sourceImageView];
[destinationView addSubview: self.destinationImageView];
[UIView animateWithDuration:1.0
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
self.destinationImageView.frame = self.finalFrameD;
self.sourceImageView.frame = self.finalFrameS;
}
completion:^(BOOL finished) {
[self.sourceImageView removeFromSuperview];
[self.destinationImageView removeFromSuperview];
}];
This code worked with iOS 7. However, when using iOS 8, it seems like the animation is not performed. The destinationImageView and sourceImageView are directly moved to the finalPosition (WITHOUT ANIMATING) and the completion block is not called, so both UIImageView are not finally removed.
Does anyone knows how the animation should be performed with iOS 8?
You should adjust the auto layout constraints and not the frames position. Have a look at this solution. I hope it helps.
UIView transitionWithView & setting the frame no longer works iOS8
Use the following line of code before the start of the animation:
[UIView setAnimationsEnabled:YES];
[UIView transitionWithView:imageView
duration:3.0
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
imageView.image = [UIImage imageNamed:[welcomePhoto objectAtIndex:photoCount]];
}
completion:^(BOOL finish){
}];
When the animation transition at the three second,
imageView can't receive custom gesture,
other times is fine.
How can i fix it? Thanks.
The reason : when UIView animation starts from one point to another, the actual view goes to the new position straight away but it is just hidden. And the view you see moving is just an illusion.
My Given reason is based on paul hagerty's stanford lecture about animation.
The solution to this can be found in other given answer.
I am having a weird error while animating a couple of view in iOS. My goal is to switch from a custom "Split View". You can see what's going on in this youtube video: http://youtu.be/ZWbf2bQYMns
You can see the weird "bump" in the Y value of the UIImageView, and I have been wondering how to fix it for quite a while now.
This is the View Controller's interface:
#interface VideoSharing_Pad : UIViewController
{
IBOutlet UIView *videoCallView;
IBOutlet UIImageView *imageView; //This is "inside" mediaView
IBOutlet UIView *mediaView;
CGRect mediaRect;
CGRect videoCallRect;
CGRect imageRect;
}
In viewDidLoad I store both views doing:
//Get frames from XIB
mediaRect = mediaView.frame;
videoCallRect = videoCallView.frame;
imageRect = imageView.frame;
And this is the code that executes when I want to switch from the Split View to a full Screen Mode:
- (IBAction)toggleFullScreen:(id)sender
{
if (iScreenMode == callAndShareMedia) {
CGRect fullScreenRect = CGRectMake(0, 0, 1024, 768);
CGRect dissapearRect = CGRectMake(0, - videoCallView.bounds.size.height, videoCallView.bounds.size.width, videoCallView.bounds.size.height);
[UIView animateWithDuration:1.0
delay:0.1
options: UIViewAnimationCurveEaseOut
animations:^{
[videoCallView setFrame:dissapearRect];
[imageView setFrame:fullScreenRect];
[mediaView setFrame:fullScreenRect];
}
completion:^(BOOL finished){
}];
iScreenMode = onlyShareMedia;
return;
}
else if (iScreenMode == onlyShareMedia)
{
[UIView animateWithDuration:1.0
delay:0.1
options: UIViewAnimationCurveEaseOut
animations:^{
[videoCallView setFrame:videoCallRect];
[mediaView setFrame:mediaRect];
[imageView setFrame:imageRect];
}
completion:^(BOOL finished){
}];
iScreenMode = callAndShareMedia;
return;
}
}
I would really appreciate any help I can get. Thanks a lot!
this is a screenshot of the XIB:
as you can see from the screenshot and the .h file, the imageView is inside an UIView called mediaView, The other UIView, videoCallView is the one with the three dummy pictures.
Interesting question indeed. It definitely has to do with animating superview and subview at the same time. I did sample program, and reproduced similar situation.
My workaround would be to avoid animating the superview (mediaView), and expand only the subview (imageView) to full rectangle. Since your superview (mediaView) does not have much, it should not give so different user experience.
So, instead of
[UIView animateWithDuration:1.0
delay:0.1
options: UIViewAnimationOptionCurveEaseOut
animations:^{
[videoCallView setFrame:dissapearRect];
[imageView setFrame:fullScreenRect];
[mediaView setFrame:fullScreenRect];
}];
You can do
[UIView animateWithDuration:1.0
delay:0.1
options: UIViewAnimationOptionCurveEaseOut
animations:^{
[videoCallView setFrame:dissapearRect];
[imageView setFrame:(CGRect){fullScreenRect.origin.x - mediaRect.origin.x, fullScreenRect.origin.y - mediaRect.origin.y, fullScreenRect.size}];
}];
For coming back to normal mode, you can just ignore mediaView animation. Probably you want to move (animate) the toggleButton along with other animation as well.
#jrturton's answer (second part) seemed a nice workaround, but it did not work on my sample code. It worked on the way to go (expansion), but bumped on the way back (shrink), for the reason I don't know why. But don't dismiss his answer because of my comment, it could be me.
Interesting question. I can't view your video from work but I expect your issue is that you are resizing both a view and its subview during an animation, there will probably be interference from any autoresizing masks (do you have them?) - the superview will change the size of the subview, then the interpolated frame will be applied.
If you think about it there will also be a stage where your image view has to animate more quickly than the superview as it has more ground to cover to get to the same final rect. The interpolation worked out by the animation may struggle with this.
If removing any autoresizing masks doesn't work, you might need to split the animation into two - one to increase the size of the superview, and another to then zoom the image view to full size.
I am trying to animate the alpha value of a MapKit overlay view (specifically an MKCircleView) in iOS 5 using the following code:
-(void) animateCircle:(MKCircle*)circle onMap:(MKMapView*) mapView
{
MKCircleView * circleView = (MKCircleView*) [mapView viewForOverlay:circle];
UIViewAnimationOptions options = UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionTransitionNone;
[UIView animateWithDuration:5.0
delay:0.0
options:options
animations:^(void) { circleView.alpha = 0.9; }
completion:^(BOOL finished) {}
];
}
The alpha value of the overlay is changing as I want, but it is jumping there instantaneously rather than animating over the specified duration.
Can anyone suggest what might be wrong? Perhaps animation on overlay views os more complex with blocks than I had thought.
Core Animation has interesting behavior when concurrent animations effect the same view... If you try to animate a view before the view's last animation finished, it will assume you intended the subsequent animation to start from the desired end-state of the initial one. This can result in jumps of frames as well as jumps of alpha values.
In your case, this view is likely being animated by something else. Try locating and removing the other animation / or'ing in UIViewAnimationOptionBeginFromCurrentState to its options.