Okay, so I want to make a menu that expands down at the current touch location. I achieve this by adding my menuView with a height of 1 and then changing the height to my desired one like this:
[UIView beginAnimations:NULL context:nil];
CGRect fullRect;
fullRect = CGRectMake(menuView.frame.origin.x, menuView.frame.origin.y, 290, 180);
menuView.frame = fullRect;
[UIView commitAnimations];
Now the problem is that there are 4 buttons in this menuView and these buttons appear first and then the menuView expands down under them. Any ideas how to make the buttons appear with the menuView and not before it?
You have to set menuView.clipsToBounds = YES so the buttons are not shown outside the bounds of your menuView while it is expanding.
I would also add the following to have a fade-in effect for your buttons.
button1.alpha = 0.0; // Do this for each button before the [UIView beginAnimations];
button1.alpha = 1.0; // Do this during the animation block.
I would use a Block animation instead. That way, you can make the buttons appear during or after the animation easily. Try something like:
[UIView animateWithDuration:1.0
animations:^{
CGRect newRect = menuView.frame;
menuView.size.height += 289;
menuView.frame = newRect;
}
completion:^(BOOL finished){
[UIView animateWithDuration:0.1
animations:^{
button.hidden = NO;
}
completion:^(BOOL finished){
;
}];
}];
This will make the button stop hiding at the end of the animation. Of course, you could add more blocks in the completion block to handle more animations, and it is easy to customize this. Hope that helps!
Related
I am not familiar with iOS animation, and here is my problem:
On the login screen of our app, there is a login button. When that button is clicked, we need to move it up then change its title. Moving it up is animated like this:
[UIView animateWithDuration:0.5
animations:^{
loginButton.frame = newLoginButtonFrame;
}
completion:^ (BOOL finished) {
}];
This works as expected.
Then after we try to change the title in the completion callback like this:
[UIView animateWithDuration:0.5
animations:^{
loginButton.frame = newLoginButtonFrame;
}
completion:^ (BOOL finished) {
[loginButton setTitle:#"Cancel" forState:UIControlStateNormal];
}];
something weird happens: the button "jumps" back to the original position as if the animation was cancelled.
What is going on here?
If you are using auto layout you should animate the constraints not the frame. For example you can set an outlet for the bottom constraint and animate like this:
viewBottomConstraint.constant = 32;
[UIView animateWithDuration:0.5
animations:^{
[self.view layoutIfNeeded]; // Called on parent view
}];
}
You can find more information in the documentation here
I have a UIButton in my code that moves steadily across the screen. Currently, when the user presses the button, the alpha changes to 0 and it just disappears. What I'd like to do is run a separate animation after the button is pressed/it has disappeared. Seems easy enough but the catch is I need to run the animation at the exact point of the button when it is pressed. And I'm drawing a blank on how to make this happen. Any help will be much appreciated! I'll post some relevant code below.
-(void)movingbuttons{
movingButton2.center = CGPointMake(x, y);
displayLink = [CADisplayLink displayLinkWithTarget:self selector:#selector(moveObject)];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
}
-(void)moveObject{
movingButton2.center = CGPointMake(movingButton2.center.x , movingButton2.center.y +1);
}
-(IBAction)button2:(id)sender {
[UIView beginAnimations:nil context:NULL];
[movingButton2 setAlpha:0];
[UIView commitAnimations];
}
Replace your button2 action with below code and implement the someOtherMethodWithAnimation method with the animation you want :)
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1];
movingButton2.alpha = 0;
[UIView commitAnimations];
[self performSelector:#selector(someOtherMethodWithAnimation) withObject:nil afterDelay:1.0];
Replace your animation with:
[UIView animateWithDuration:0.25
animations:^{
self.movingbutton2.alpha = 0.0;
// modify other animatable view properties here, ex:
self.someOtherView.alpha = 1.0;
}
completion:nil];
Just a nit picking point, but is the button in your view controller's .xib file correctly hooked up to your IBOutlets and IBActions?
UPDATE:
You are not limited to modifying that one button in your method. You add what ever code you want in the animation block (see the udated axample above).
UIView animatable properties, there is an animation section there.
Another approach could be (I am just using alpha as an example):
[UIView animateWithDuration:1.0
animations:^{
self.movingButton2.alpha = 0.0;
}
completion:^{
[UIView animatateWithDuration:0.25
animations:^{
self.someOtherView.alpha = 1.0;
}
completion:nil];
}];
This will more likely guarantee the animations will hapen one after another.
I'm trying to scale a UIView (with animation) after I move it (with animation). The problem is, when the scaling animation begins, it jumps back to the original position. Why?
[UIView animateWithDuration:t delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
// Drop the ball
CGRect frame = coinView.frame;
frame.origin.y += d;
coinView.frame = frame;
coinView.shouldSparkle = NO;
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3 animations:^{
// Initial scale up for ball "poof"
coinView.transform = CGAffineTransformScale(coinView.transform, 1.5, 1.5);
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3 animations:^{
coinView.transform = CGAffineTransformScale(coinView.transform, 0.000001, 0.000001);
} completion:^(BOOL finished) {
[coinView removeFromSuperview];
}];
}];
}];
EDIT: This is how I generated my d:
static CGFloat groundPositionY = 325;
CGRect convertedFrame = [coinView.superview convertRect:coinView.frame toView:self.view];
CGFloat d = groundPositionY - CGRectGetMaxY(convertedFrame);
EDIT2: Okay, so I changed the second UIView animation to the following and I discovered that the jump (and the scale down) happens before the second animation occurs, i.e. when animateWithDuration:delay:options:animations:completion: is called.
[UIView animateWithDuration:5 delay:3 options:0 animations:^{
coinView.transform = CGAffineTransformScale(coinView.transform, 1.5, 1.5);
} completion:nil];
I tested your code and it works fine for me. How do you generate your d? and on which block exactly it goes back?
I found the problem...
The coinView is a subview of a child view controller's view. The problem comes from the fact that I overrode that child view controller's viewDidLayoutSubviews method to lay out all the coinView's, so whenever that method was called, the coin view would move back to its original position and size intended by the child view controller.
Thanks for all of your help, repoguy and sergio!!
In iOS, how can one briefly draw attention to an object on screen? Suppose, create a brief glow or cause a shadow to appear and then disappear?
For the purposes of this question, let's define "object on screen" as an instance of UIImageView.
Also, if possible provide an example of how to draw attention to a button.
Most people list code, but I'm sticking to describing some examples;
I've seen objects briefly grow and shrink back to their normal size to draw attention
Bejeweled (a Popcap game) lets diamonds briefly 'shine' (as if sunlight passed over it) to give you a subtle hint
I've seen certain applications use a hand or a fictive character point to a certain object briefly
And of course, you could always introduce a talking paperclip to tell you what's what.
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.1f];
yourView.transform = CGAffineTransformMakeScale(1.1, 1.1);
[UIView commitAnimations];
Or, of course the same thing with a block animations. And after the attention got away from your view you can use :
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.1f];
yourView.transform = CGAffineTransformIdentity;
[UIView commitAnimations];
Here is a simple hop animation...
- (void)drawAttn
{
float jumpHeight = 20.0;
CGPoint originalPoint = objectForAttn.center;
CGPoint jumpPoint = CGPointMake(objectForAttn.center.x, objectForAttn.center.y - jumpHeight);
[UIView animateWithDuration:0.20 delay:0.0 options:UIViewAnimationOptionAutoreverse animations:^{
[objectForAttn setCenter:jumpPoint];
} completion:^(BOOL finished) {
/* do other stuff after hop */
}];
}
My app QCount (free in the store, tap a "wrong" number 3 times) uses a fade animation as follows:
(note I wrote this when I was REALLY new to iOS, so there is probably a more compact way to write it)
aLabel = // a UILabel I get from somewhere
aColor = aLabel.backgroundColor;
[UIView animateWithDuration:0.2
delay: 0.0
options: UIViewAnimationOptionCurveEaseOut
animations:^{
aLabel.alpha = 0.0;
}
completion:^(BOOL finished){
// Wait .2 seconds and then fade in the view
[UIView animateWithDuration:.2
delay: 0.0
options:UIViewAnimationOptionCurveEaseIn
animations:^{
aLabel.alpha = 1.0;
}
completion:nil];
}];
There are lots of options: hopping, underlining, vibrating, blinking, rotating, scaling, endarkening around, and their combinations.
But IMO, shine effect on "slide to unlock" text is excellent.
You can check it out here:
iPhone "slide to unlock" animation
I wanted to draw attention to a label whose value had changed. This simple animation produces a nice 'I've changed' animation...
//copy the label
UILabel *newPageLabel = [[UILabel alloc] initWithFrame:_countLabel.frame];
[newPageLabel setFrame:CGRectOffset(newPageLabel.frame, 0, 0)];
newPageLabel.text = _countLabel.text;
newPageLabel.textAlignment = _countLabel.textAlignment;
newPageLabel.backgroundColor = _countLabel.backgroundColor;
newPageLabel.textColor = _countLabel.textColor;
newPageLabel.font = _countLabel.font;
//scale and fade out the copied label
[self.navigationController.toolbar addSubview:newPageLabel];
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionLayoutSubviews
animations:^{
newPageLabel.transform = CGAffineTransformMakeScale(2,2);
newPageLabel.alpha = 0;
}
completion:^(BOOL finished){
[newPageLabel removeFromSuperview];
}
];
I'm building a basic calculator app. The calculator is already fully functional with basic features. The problem I'm having is I ran out of room on the screen to add other, more advanced features. Ideally what I would like to do is create some kind of subclass and view that slides up to to the bottom of the label (where the completed calculations are displayed), when a button on the bottom of the screen is pressed. In other words, I want a view with more operators and computation options to slide up to the bottom of the label and I dont want this view to cover up any digits that are being displayed in the label. Is there anyway to achieve this?
Yes, you can. When your button is pressed, create your new view (with the extra functions), add it as a subview to self.view, and animate a change to it's frame, so that it's frame changes from below the visible view to just below your digits.
Like this:
-(void) buttonPressed {
UIView *myNewView = << create your view >>
myNewView.frame = CGRectMake(0,480, 320,200); // or whatever your width and height are
// 480 means it will be below the visible frame.
[self.view addSubview: myNewView];
float bottom_Y_of_digit_display = 100;// or wherever it is...
[UIView beginAnimations:nil contenxt:nil];
[UIView setAnimationDelay: 0.0];
[UIView setAnimationDuration: 1.0]; // one second.
myNewView.frame = CGRectMake(0,bottom_y_of_digit_display, 320,200);
[UIView commitAnimations];
}
You can use UIAnimations to create an animation out of any changes to UIView properties. You can make your UIView hidden by settings its frame.origin.y to 480 and then change the rect and wrap it in a UIAnimation.
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.75];
CGRect newFrame = newSubView.frame;
newFrame.origin.y -= newSubView.frame.size.height;
newSubView.frame = newFrame;
[UIView commitAnimations];
UPDATE
If you are targeting iOS 4.0 and later then you should use the new UIAnimations interface.
UIViewAnimationOptions options = UIViewAnimationOptionCurveLinear;
[UIView animateWithDuration:0.75 delay:0 options:options
animations:^(){
CGRect newFrame = newSubView.frame;
newFrame.origin.y -= newSubView.frame.size.height;
newSubView.frame = newFrame;
}
completion:^(BOOL finished){
//Do something upon completion
}];