I am working on a game project, and what i want to do is moving a group of labels in a window, from top of the screen to the bottom, let user read these labels, and fade away (like labels sliding from top to bottom without any trigger).
I thought that a timer variable in a loop would help me slide and change their position according to the timer value.
I made some research but if you share an article with me, i can know what i should look up for.
Thank you.
#Chuck is right. To elaborate:
-(void)doTheLabelThing {
// assume all the labels are in a container view that is 320 wide and 100 tall
self.labelContainer.frame = CGRectMake(0, -100, 320, 100);
[UIView animateWithDuration:0.5 animations:^{
// slide down
self.labelContainer.frame = CGRectMake(0, 360, 320, 100);
} completion:^(BOOL finished) {
// give user 3 seconds to read it
[UIView animateWithDuration:0.5 delay:3.0 options:0 animations:^{
// fade out
self.labelContainer.alpha = 0.0;
} completion:^(BOOL finished) {
// restore everything to original state
self.labelContainer.alpha = 1.0;
self.labelContainer.frame = CGRectMake(0, -100, 320, 100);
}];
}];
}
Don't use a loop or a timer; use Core Animation. Just do animateWithDuration:animations: or similar and set their position to the new place you want them to be.
Related
I'm trying to apply a fade to an UIView I created programmatically on the top of another.
[UIView animateWithDuration:0.5 animations:^(void) {
[self.view setAlpha:0];
}
completion:^(BOOL finished){
[self.view removeFromSuperview];
}];
The finished event is called properly after exactly 0.5 seconds, but I don't see any fade (I should see the UIView on the bottom).
If instead of using the alpha, I move away the UIView it works (I see the bottom UIView while the top UIView slides away), so it seems to be a problem related to alpha, but I can't figure out what's wrong!
[UIView animateWithDuration:0.5 animations:^(void) {
CGRect o = self.view.frame;
o.origin.x = 320;
self.view.frame = o;
}
completion:^(BOOL finished){
[self.view removeFromSuperview];
}];
I used alpha animations previously and they works in this way usually...
Try setting opaque to NO explicitly. I had the same problem and setting that solved my problem. Apparently, opaque views just don't seem to play well with alpha.
Credit goes to Hampus Nilsson's comment though.
I experience same issue in my case its because of thread
So i end up with write animation block in main thread.
dispatch_async(dispatch_get_main_queue(), ^{
[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionLayoutSubviews animations:^{
View.alpha = 0.0f;
} completion:^(BOOL finished) {
}];
});
[UIView animateWithDuration:0.6 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^{
[self.view setAlpha:0];
}
completion:^(BOOL finished) {
[self.view removeFromSuperview];
}];
This will work right, and your fading will be nicer, because of options:UIViewAnimationOptionCurveEaseInOut.
I ran into the exact problem. In my case, I wanted the view to be hidden at first, so I set hidden to true. I thought changing the alpha value changes hidden property automatically, but that wasn't the case.
So, if you want the view to be hidden at first, set its alpha to 0.
I had exactly the same problem, and none of the suggestions worked for me. I overcame the problem by using the layer opacity instead.
This is the code for showing the layer (using Xamarin, but you'll get the idea):
//Enter the view fading
zoomView.Layer.Opacity = 0;
UIApplication.SharedApplication.KeyWindow.RootViewController.View.Add(zoomView);
UIView.AnimateNotify(
0.15, // duration
() => { zoomView.Layer.Opacity = 1.0f },
(finished) => { }
);
And this is for fading out the same zoomView
UIView.AnimateNotify(
0.15, // duration
() => { zoomView.Layer.Opacity = 0; },
(finished) =>
{
if (finished)
{
zoomView.RemoveFromSuperview();
}
}
);
One more piece of the puzzle. When you're animating constraints, you can set the new constraint constants outside of an animation block and then call layoutIfNeeded inside the animation.
With view alphas, these need to be set directly inside the animation block.
Change this:
//setup position changes
myConstraint.constant = 10
myOtherConstraint.constant = 10
//whoops, alpha animates immediately
view.alpha = 0.5
UIView.animate(withDuration: 0.25) {
//views positions are animating, but alpha is not
self.view.layoutIfNeeded()
}
to
//setup position changes
myConstraint.constant = 10
myOtherConstraint.constant = 10
UIView.animate(withDuration: 0.25) {
view.alpha = 0.5
self.view.layoutIfNeeded()
}
In my iphone application I have several images. lets say some small square images. what I want is I want that small objects appear from the top of the screen at rondom times and leaves the screen from the bottom. I mean, for example, object randomly appeared from the x:30 y:0 point (x value must be random) and leaves from the x:30 y:460 with an animation.
I am programming an 2d racing game and they are the cars. hope it is clear.
edit: well I tried to change the frame the numbers belong to something else. But I could not have the frame of the image and also I could not figure out how to generate position randomly more than one time. since I was planning to put it on the viewDidLoad.
[UIView beginAnimations:#"myAnimation" context:nil];
CGRect Frame = image.frame;
if(Frame.origin.y == 340){
Frame.origin.y = 260;
}else{
Frame.origin.y = 340;
}
image.frame = Frame;
[UIView commitAnimations];
Your example code doesn't show what you are asking for. It's also really hard to guess what you want.
Here's my literal interpretation of what you have asked for
for (int i = 0; i < 100; i++) {
CGRect startFrame = CGRectMake(arc4random_uniform(320), -50, 50, 50);
CGRect endFrame = CGRectMake(arc4random_uniform(320),
CGRectGetHeight(self.view.bounds) + 50,
50,
50);
UIView *animatedView = [[UIView alloc] initWithFrame:startFrame];
animatedView.backgroundColor = [UIColor redColor];
[self.view addSubview:animatedView];
[UIView animateWithDuration:2.f
delay:i * 0.5f
options:UIViewAnimationCurveLinear
animations:^{
animatedView.frame = endFrame;
} completion:^(BOOL finished) {
[animatedView removeFromSuperview];
}];
}
If you stick this in viewDidAppear: then you'll see 100 objects animate in the way you want. Obviously this is extremely inefficient and you may want to look at recycling the views etc but this shows how to animate views with UIView animation with some random points
I'd like to have an image in my iphone app "pop-in" on screen rather than just appearing. By "pop-in" I mean that it would grow from a small dot to its actual size. For reference, this is exactly the same as the "pop" animation effect in Keynote.
I'm completely new to iOS animations, so if someone could point me in the direction on the animation effects I would need to use, it would be greatly appreciated.
Thanks
Brian
UPDATE
I've added this code from the suggestions below. This works but it scales my image down, rather than up. I know that is because I have 0.01 as the transform scale size, but I would like to know how I can start out with an image of size 0.0 and scale up to 1. Is it just a matter to setting the size of my image to 0?
Thanks
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration: 0.2];
image.transform = CGAffineTransformMakeScale(0.01, 0.01);
[UIView setAnimationDelegate:self];
[UIView commitAnimations];
The effect you’re looking for is something like this:
// instantaneously make the image view small (scaled to 1% of its actual size)
view.transform = CGAffineTransformMakeScale(0.01, 0.01);
[UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
// animate it to the identity transform (100% scale)
view.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished){
// if you want to do something once the animation finishes, put it here
}];
if you want something like Facebook does on liking any post then use this
-(void)animateButton:(UIButton *)sender{
UIButton * btn = (UIButton *)sender;
[UIView animateWithDuration:0.3/1.5 animations:^{
btn.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.4, 1.4); // scales up the view of button
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3/2 animations:^{
btn.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.7, 0.7);// scales down the view of button
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3/2 animations:^{
btn.transform = CGAffineTransformIdentity; // at the end sets the original identity of the button
}];
}];
}];}
just call this method when you want to animate the view
if you have text and image on the button and you just want to animate the image of the button then just replace "btn" with "btn.imageView" , this will just produce animation on the image view property of the button.
Hope it helps
All the best.
You have to animate the frame of the view, to shrink it from zero to the final state.
This can be done for example with UIView block animation.
So for example start with your view as an IBOutlet property self.myView with the final size and position, but set the hidden flag.
Then when you want it to appear use the following:
// Save old frame as final stater and set it to zero size for the start of the animation
// But keep the same center position, so it just grows and don't move around
CGRect oldFrame = self.myView.frame;
CGRect oldCenter = self.myView.center;
self.myView.frame = CGRectZero;
self.myView.center = oldCenter;
self.myView.hidden = NO;
NSTimeInterval duration = 0.3;
[UIView animateWithDuration:duration delay:0.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
// New position and size after the animation should be the same as in Interface Builder
self.myView.frame = oldFrame
}
completion:^(BOOL finished){
// You can do some stuff here after the animation finished
}];
Swift 2.0 version
view.transform = CGAffineTransformMakeScale(0.01, 0.01);
UIView.animateWithDuration(0.2, delay: 0, options: .CurveEaseOut, animations: { () -> Void in
// animate it to the identity transform (100% scale)
self.view.transform = CGAffineTransformIdentity;
}) { (finished) -> Void in
// if you want to do something once the animation finishes, put it here
}
For that you will have to use a simple UIView
Add the UIview to your current view.
- (void) initPopUpView
{
popup.alpha = 0;
popup.frame = CGRectMake (160, 240, 0, 0);
[self.view addSubview:popup];
}
- (void) animatePopUpShow
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[UIView setAnimationDelegate:self];
[UIView setAnimationWillStartSelector:#selector(initPopUpView)];
popup.alpha = 1;
popup.frame = CGRectMake (20, 40, 300, 400);
[UIView commitAnimations];
}
The main UIView contains two subviews - UIView_1 and UIView_2.
In the UIView_2, there is a button to show or hide the UIView_1.
For example, when a user touches the button to show the UIView_1, then UIView_1 will slide down and UIView_2 will push downwards with transition.
I have very little knowledge in animation. Can someone show me some sample code for reference?
Should I use CGAffineTransformMakeTranslation?
Thanks.
You don't need anything so complex. Just change the view's frame size.
NSTimeInterval animationDuration = /* determine length of animation */;
CGRect newFrameSize = /* determine what the frame size should be */;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:animationDuration];
theViewToChange.frame = newFrameSize;
[UIView commitAnimations];
Simply Hide/show with fadein/out effect
`
/To Show/
sliderView.hidden = NO;
sliderView.alpha = 0.1;
[UIView animateWithDuration:0.25 animations:^{
sliderView.alpha = 1.0f;
} completion:^(BOOL finished) {
// do some
}];
/To hide/
[UIView animateWithDuration:0.25 animations:^{
sliderView.frame = CGRectMake(130, 30, 0, 0);
[sliderView setAlpha:0.1f];
} completion:^(BOOL finished) {
sliderView.hidden = YES;
}];
`
It depends on what you want to do with UIView_2.
Place UIView_1 below UIView_2 in Interface Builder.
Size UIView_2 to take up all the space below the UINavigationBar.
Use the following code to either resize (using uiview2_resized_rect) the frame for UIView_2, or translate/move the frame for UIView_2 (using uiview2_translated_rect ):
CGRect uiview1_original_rect = UIView_1.frame;
CGRect uiview2_original_rect = UIView_2.frame;
CGRect uiview2_translated_rect = CGRectMake(uiview2_original_rect.origin.x,
uiview2_original_rect.origin.y+uiview1_original_rect.size.height,
uiview2_original_rect.size.width,
uiview2_original_rect.size.height);
CGRect uiview2_resized_rect = CGRectMake(uiview2_original_rect.origin.x,
uiview2_original_rect.origin.y+uiview1_original_rect.size.height,
uiview2_original_rect.size.width,
uiview2_original_rect.size.height-uiview1_original_rect.size.height);
[UIView animateWithDuration:0.300 delay:0.0
options:UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionBeginFromCurrentState
animations:^{
//uncomment this and comment out the other if you want to move UIView_2 down to show UIView_1
//UIView_2.frame = uiview2_translated_rect;
UIView_2.frame = uiview2_resized_rect;
} completion:^(BOOL finished) {
}];
I have made many tries to have the same effect of switch than the one you can see when calling a phone number : the front view disapear with a zoom effect, while the other one appears also with a zoom effect.
I can't achieve doing that effect, it's always a so-so. There seems to have a scale effect, with an action on opacity, but...
Do you know how this can be done to reflect that effect (not a so-so, I have tons of those) ?
// Make this interesting.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:self.view cache:YES];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(startupAnimationDone:finished:context:)];
self.view.alpha = 0.0;
self.view.frame = CGRectMake(self.view.center.x,self.view.center.y , 0, 0);
[UIView commitAnimations];
}
I hope this is a framework for a better animation. It's not guaranteed to work, but it's the best I could think of for the first part of the transition.
This will change the frame of your view controller's view so that it "sucks" itself into the center of the screen, which is a natural black color. Now that I think about it, a CGAffineTransform would have been much easier...
EDIT (For pedantry's sake): Starting with iOS 4, you can now use the newer, and much more syntactically clean, animation blocks and a nice transform:
[UIView animateWithDuration:0.25 delay:0.0 options:0 animations:^{
//animate the toolbars in from the top and bottom
[myTopView setFrame:CGRectMake(0, self.view.frame.size.height - 44, self.view.frame.size.width, 44)];
[myBottomView setFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
//fade to black...
self.view.alpha = 0.0;
//and suck inwards.
self.view.frame = CGRectMake(self.view.center.x,self.view.center.y , 0, 0);
}
completion:^{
//do something to end nicely, or start another animation block.
}];