Apple's documentation describes UIViewAnimationOptionLayoutSubviews as:
Lay out subviews at commit time so that they are animated along with
their parent.
Here is a sample of the code I'm interested in. I wish to animate the -layoutSubviews of detailView; however, it doesn't seem to layout the subviews of detailView, so I'm not sure what effect it actually has.
void (^animation) () = ^
{
[self.detailView setNeedsLayout];
[self.detailView layoutIfNeeded];
};
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionLayoutSubviews
animations:^{
animation();
}
completion:nil];
Since you want your second animation to occurs from the current state of your first animation (whether it is finished or not) I recommend to use the UIViewAnimationOptionLayoutSubviews option when setting your second animation.
[UIView animateWithDuration:0.2
delay:0.0
options:UIViewAnimationOptionLayoutSubviews
animations:^{
CGAffineTransform settingsTransform = CGAffineTransformMakeTranslation(self.animatedView.frame.size.width, 0);
self.animatedView.transform = settingsTransform;
}
completion:nil];
Related
I have an app in which I use a lot of animations with ease in/out curves. I use this function in all cases: UIView animateWithDuration:delay:options:animations:completion
All these animations are working ok, but now I am trying to add one to a drawer that pops in and out, and for some reason this particular animation is always linear:
[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
self.activityBar.view.frame = CGRectMake(0, self.activityBar.view.frame.origin.y, self.activityBar.view.frame.size.width, 20);
} completion:nil];
Why is this animation linear, while other animations with the same option are curved?
This is the view hierarchy for self.activityBar.view
-UIViewController
-UIViewController
-UIViewController (animation code lives here)
-UIViewController (activityBar)
-UIView (activityBar.view)
//Set old Frame for activityBar Here
[UIView animateWithDuration:2.0 delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
[self.view layoutIfNeeded];
//Update to the new frame
self.activityBar.view.frame = CGRectMake(0, self.activityBar.view.frame.origin.y, self.activityBar.view.frame.size.width, 20);
} completion:^(BOOL finished) {
}];
I have set the animation like seen in below image. In which UIbutton move from left to right and then top to bottom. Animation work correctly but after completion of animation UIButton comes to its original place before the segue perform. so, it's not look good. I want to set that after the completion of animation UIButton can't come to it's own place before segue .
Here is my try with Image.
//Move button Left to Right
- (IBAction)btnEasy:(id)sender {
Easy=YES;
NSLog(#"your x is: %f ", self.btnEasy.frame.origin.x);
NSLog(#"your y is: %f ", self.btnEasy.frame.origin.y);
x1=self.btnEasy.frame.origin.x;
y1=self.btnEasy.frame.origin.y;
CGRect screenRect = [[UIScreen mainScreen] bounds];
[UIView animateWithDuration:1.150 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
self.btnEasy.frame = CGRectMake(screenRect.size.width/1.80, self.btnEasy.frame.origin.y, self.btnEasy.frame.size.width, self.btnEasy.frame.size.height);
[self performSelector:#selector(btneasyanimation) withObject:self afterDelay:1.160 ];}
completion:^(BOOL finished) {
}];
//Move Button top to Bottom
if (Easy==YES) {
if (isiPad2 || isiPadAir || isiPadRatina) {
//[self.view layoutIfNeeded];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:1.0];
[_btnEasy setFrame:CGRectMake(self.view.frame.origin.x+290, self.view.frame.origin.y+900, self.btnEasy.frame.size.width, self.btnEasy.frame.size.height)];
[UIView commitAnimations];
}
else if (isiPhone4s) {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:1.0];
[_btnEasy setFrame:CGRectMake(self.view.frame.origin.x+92, self.view.frame.origin.y+428, self.btnEasy.frame.size.width, self.btnEasy.frame.size.height)];
[UIView commitAnimations];
}
}
[self performSelector:#selector(segueeMethod) withObject:self afterDelay:1.160 ];
Image :-
If you are not placing directly the button given it the frame, thus using autolayout (autoresize will end with the same effect). You need to explicitly use autolayout, retain a reference to your constraints and update them (you can search here how to do that) and then set the UIView animation block [button layoutIfNeeded]
You can see a detailed answer about it in this answer
There is an easy and quick way that will work with your current implementation. Provided you know exactly where you want the view to be once the animation is done, you can do the following:
in UIView animateWithDuration: ... assign the final transform (position & orientation) of the view in the completion block, i.e.:
completion:^(BOOL finished) {
// Assign views transform and appearance here, for when the animation completes
}
Hope that helps.
I new to IOS programming.
I want to toggle button border color automatically at start of apps to get user attention,
I have tried the below code, but only the final color is selected.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelay:0.0];
[UIView setAnimationDuration:3.0];
button.layer.borderWidth=2.5f;
button.layer.borderColor=[[UIColor blueColor]CGColor];
[UIView setAnimationDelay:3.0];
button.layer.borderColor=[[UIColor clearColor]CGColor];
[UIView setAnimationDelay:6.0];
button.layer.borderColor=[[UIColor redColor]CGColor];
[UIView commitAnimations];
}
What you're doing is an invalid way to chain animations. As a result, only the last changes are applied. Additionally, you should be using block based animations, which Apple has recommended since iOS 4. Should be something like this:
[UIView animateWithDuration:3.0 animations:^{
button.layer.borderWidth=2.5f;
button.layer.borderColor=[[UIColor blueColor]CGColor];
} completion:^(BOOL finished) {
[UIView animateWithDuration:3.0 animations:^{
button.layer.borderColor=[[UIColor clearColor]CGColor];
} completion:^(BOOL finished) {
[UIView animateWithDuration:3.0 animations:^{
button.layer.borderColor=[[UIColor redColor]CGColor];
}];
}];
}];
This answer is the same as 0x7fffffff's answer, except it uses block variables so it looks a little cleaner and hopefully makes more sense:
void (^animateToRed)(BOOL finished) = ^(BOOL finished) {
[UIView animateWithDuration:3.0 animations:^{
button.layer.borderColor=[[UIColor redColor]CGColor];
} completion: nil];
}
void (^animateToClear)(BOOL finished) = ^(BOOL finished) {
[UIView animateWithDuration:3.0 animations:^{
button.layer.borderColor=[[UIColor clearColor]CGColor];
} completion:animateToRed];
}
[UIView animateWithDuration:3.0 animations:^{
button.layer.borderWidth=2.5f;
button.layer.borderColor=[[UIColor blueColor]CGColor];
} completion:animateToClear];
UIView's animateWithDuration:animations:completion: method is the best way to animate changes over time.
It takes 3 arguments.
A duration as a CGFloat, which is a measure of the length of the animation in seconds.
An animation block, which tells what animations to perform.
A completion block, which allows you to execute code after the animation is complete.
This code snippet creates two completion blocks.
The animateToRed completion block handles the animating of the border to red. It's completion block is nil, at this point, we're done animating.
The animateToClear completion block handles the animating of the border to clear. It's completion block is the animateToRed which we just defined.
Finally, we call animateWithDuration, animating the border to blue, and passing the animateToClear block for the completion (which in turn calls the animateToRed block).
For an animation this simple and with no repeated animations, it may seem like slightly overkill to do it this way (though it is slightly more readable). However, with a more complicated series of animations, especially if there's any repetitiveness, creating block variables like this to use and pass quickly becomes quite helpful.
I've got a UILabel that slides in and out of view, but after it slides back in it disappears. I want it to persist.
How can I achieve this? Also, why does this happen?
Here's the code:
[UIView animateWithDuration:0.1
delay:0.0
options:UIViewAnimationOptionAutoreverse
animations:^{
[self.listLabel setFrame:CGRectMake(325, 141, 320, 181)];
}
completion:nil];
Thanks.
In official documentation
UIViewAnimationOptionAutoreverse
Run the animation backwards and forwards. Must be combined with the UIViewAnimationOptionRepeat option.
Why don't you use UIViewAnimationOptionCurveEaseOut and UIViewAnimationOptionCurveEaseIn animation option for your label?
Just set your label's frame.origin.x = [outside the right side of it's superview's bound]
and set it back to it's original position when you want to slide-In again using EasyOut animation.
Here's something what I'm talking about...
CFRect frame = self.listLabel.frame;
//Point to hide your label by sliding it outside the right side of it's parent's view.
// mask or clipToBounds of parent's view must be YES
frame.origin.x = [self.listLabel.superview.frame.size.width];
[UIView animateWithDuration:0.1
delay:0.0
options:UIViewAnimationOptionCurveEaseIn
animations:^{
[self.listLabel setFrame:frame];
}
completion:nil];
And When you want to slide back in, use opposite animation and label's original position, of course you need to store it's original position somewhere so you could slide-in it back.
[UIView animateWithDuration:0.1
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
[self.listLabel setFrame:label_original_frame];
}
completion:nil];
UIViewAnimationOptionAutoreverse is designed for a cyclical animation. To just bounce something offscreen and back, you should just write it as 2 animations:
CGRect originalFrame = self.listLabel.frame;
[UIView animateWithDuration:0.05
delay:0.0
options:UIViewAnimationOptionLayoutSubviews
animations:^{
[self.listLabel setFrame:CGRectMake(325, 141, 320, 181)];
}
completion:^(BOOL finished){
[UIView animateWithDuration:0.05
delay:0.0
options:UIViewAnimationOptionLayoutSubviews
animations:^{
[self.listLabel setFrame:originalFrame];
}
completion:nil];
}
];
As there still seems to be no valid answer, I propose a (now possible) approach:
In Xcode 6, with the app running in the simulator, go to "Debug" in the top bar, select "View Debugging" and "Capture View Hierarchy". Then go and search your missing Label. You can also see properties etc. of the Label in the right Xcode bar.
I was trying to implement something resembling the iBook store on iPad.
When you tap on a book cover it will flip and scale in one fluid motion, from the book cover to an empty background - which then loads the content.
I have tried different approaches, first flipping, then scaling, I tried wrapping the transitionFromView inside the animateWithDuration block, but i can't get it to look properly. It will either do one then the other, or in the last case do one, then 'flickr' and do nothing.
[UIView transitionFromView:fromView
toView:toView
duration:0.8
options:UIViewAnimationOptionTransitionFlipFromRight
completion:^(BOOL finished) {
if (finished) {
[UIView animateWithDuration:0.4
animations:^{[fromView setFrame:originFrame];}
completion:^(BOOL finished){}];
}
}];
Blocks are great for animations, no doubt!
But how can I both flip and scale at the same time?
Thanks in advance.
I have been able to produce this effect using non-block animations by performing the flip on a view containing the views you switch between.
CGRect endFrame; //The frame of the view after animation
UIView *sview; //The superview containing the first view
UIView *view1; //The first view, to be removed from sview
UIView *view2; //The second view, to be added to sview
view2.frame = view1.frame;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.8];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:sview cache:YES];
[view1 removeFromSuperview];
[sview addSubview:view2];
sview.frame = endFrame;
[UIView commitAnimations];
For this to work, the autosizing mask on view2 must be resizable in width and height.