I have one UIbutton. I want it to move from point A to point B. While going, that button have to do one full 360' rotation.
After some event, I want that UIButton to come back to its position, this time rotating in the reverse direction.
I wrote this code, but it didnt work. I'm seeing the button rotate in unexpected ways. What am I missing here?
To move:
[UIView animateWithDuration:0.3 animations:^{
CGAffineTransform rotate360AntiClockWise = CGAffineTransformMakeRotation(M_PI_2);
CGRect initialFrame = button.frame;
[button setTransform:rotate360AntiClockWise];
[button setFrame:CGRectMake(initialFrame.origin.x - 140.0, initialFrame.origin.y, initialFrame.size.width, initialFrame.size.height)];
}];
To comeback to the same position
[UIView animateWithDuration:0.4 animations:^{
CGAffineTransform rotate360ClockWise = CGAffineTransformMakeRotation(-M_PI_2);
[button setFrame:originalFrame]; //for movement
[button setTransform:rotate360ClockWise];
}];
}
I can't try it at the moment, but if I remember correctly using the frame causes problems when applying transformations. Have you tried setting the center of the button?
[button setCenter:newCenter]
Where newCenter is a corresponding CGPoint.
The simplest way to do a rotation and a transform without messing up the Transformation matrix of the view is:
place the button inside of a view (moveView) with the same frame-size with origin 0|0
when you want to do a rotation, rotate the button
when you want to move the button, translate the moveView
Please do this in 3 steps
CGAffineTransform matOne = CGAffineTransformMakeTranslation(x_offset, y_offset);
CGAffineTransform matTwo = CGAffineTransformMakeRotation(M_PI_2);
CGAffineTransform matResult = CGAffineTransformConcat(matOne, matTwo);
// Finally
[button setTransform:matResult];
I hope this helps you. Please make sure Concat has matOne as the first parameter.
Also this is a possible duplicate for another question:
translation after rotation view using CGAffine
Related
I have scrollview and inside scrollview I have 2 views as MainView and another as SideMenuView.
What I want to make animation like below.
Any idea what needs to be done to get this working?
Psuedo Code below:
- (void)animateSideMenu{
homeView.frame = CGRectMake(sideMenuWidth, 0.0, (self.view.frame.size.width - sideMenuWidth), self.view.frame.size.height);
[UIView animateWithDuration:1.0 delay:0.0
options:UIViewAnimationOptionCurveLinear
animations:^{
sideMenu.frame = CGRectMake(0.0, 0.0, sideMenuWidth, sideMenuHeight);
[self flipAnimation];
} completion:^(BOOL finished) {
}];
}
- (void)flipAnimation{
CABasicAnimation *yRotate = [CABasicAnimation animationWithKeyPath:#"transform.rotation.y"];
yRotate.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_2, 0, 1, 0)];
yRotate.toValue = #(M_PI * 1.5);
yRotate.duration = 0.5;
yRotate.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
[sideMenu.layer addAnimation:yRotate forKey:#"yRotate"];
}
Below are the steps to develop this type of animation:
set the frame of homeView(Red colour view) of screen size & add pan gesture to this view.
set frame of sideMenu view in negative x-axis.
Create a responder function for pan gesture recogniser, in this function call the above mentioned animateSideMenu function.
Adjust the animation parameters accordingly.
Try with this & let me know if anything comes up.
I would not use a scrollview but rather a UIPanGestureRecognizer in which I would detect your current "pan offset" and calculate a current fraction of the animation and positions of those two views (let's simplify it so that the menu is view1 and the rest view2).
Then I would simply set an appropriate transform in the .Changed state.
In .Ended state I would see whether the menu is closer to being open or close and create an animation with .toValue set accordingly. You should use CAAnimations or better - Facebook pop animations because you can pause and remove them and the views stay put and not jump to their initial positions (as is often the case with UIViewAnimate).
If you need help with writing exact code you can write here and I'll edit my answer.
There's tutorial for exactly that menu, though it's in Swift:
https://www.raywenderlich.com/87268/3d-effect-taasky-swift
I have a gesture which action moves a UIView to point B from point A. How can I add a nice transition of the UIView moving from point A to point B. I am looking at making it slowly move from point A to point B. How would I do this? At the moment to move the item I set the frame to point B.
check this code and set frame what you want
[UIView animateWithDuration:0.75 animations:^{
button.frame = CGRectMake(10, 70, 100, 100);
}];
If you're using auto-layout (and you almost certainly are - it's the default) then #PinkeshGjr s solution is likely to have problems. With AutoLayout you can't manipulate a view's frame directly. At some point after moving the frame the view's constraints can snatch it back.
Instead, you want to create constraints that control the property/properties that you want to animate (x and y position in this case) and control-drag from the constraints into your view controller's header to create outlets.
Then you want to change the constant value on the constraints and call layoutIfNeeded inside your animation code. Something like this:
buttonXConstraint.constant = 100;
buttonYConstraint.constant = 100;
[UIView animateWithDuration:0.75 animations:^{
[self.button layoutIfNeeded];
}];
The code above assumes that you've created 2 constraint outlets and called them buttonXConstraint and buttonYConstraint.
You can achieve that by using animateKeyframesWithDuration or animateWithDuration:animations but it will be just a linear interpolation. If you want to have more control over the animation I recommend that you take a look at MTAnimation it's really a powerful and easy to use Lib for achieving beautiful animations
Cheers
Very nice helper method to use for animating view.
- (void) animateView:(UIView *)view ToFrame:(CGRect) frame withDuration:(float) duration withDelay:(float) startDelay
{
[UIView animateWithDuration:duration delay:startDelay options:0 animations:^{
view.frame = frame;
} completion:^(BOOL finished)
{
// Completion actions
}];
}
I have two UIViews (My bad it is a UIView and a UIButton) which I am animating at the same time. I originally had a view and a containerView which would animate just fine and worked like a charm.
Now only one of my UIViews will move/animate in animateWithDuration even though through debugging the frame of the other view says that it is in a position it is not.
CGRect rect = self.toggle.frame;
CGRect tabRect = self.tabButton.frame;
rect.origin.x = rect.origin.x - rect.size.width;
NSLog(#"%f Before",tabRect.origin.x);
tabRect.origin.x = tabRect.origin.x - rect.size.width;
NSLog(#"%f After", tabRect.origin.x);
[UIView animateWithDuration:0.3 animations:^{ // animate the following:
self.toggle.frame = rect; // move to new location
self.tabButton.frame = tabRect;
}];
NSLog(#"%f AfterAnimation", tabButton.frame.origin.x);
The toggle view moves fine, but the tabButton view does not animate or move. The strange thing is that both the "After" and "AfterAnimation" debugging code returns the same value, which suggests the frame has indeed moved. Is there a specific reason that this will not work when toggle is a UIView when it would work as a UIContainerView?
Note that if I remove the line
self.toggle.frame = rect;
tabButton will animate correctly, but if I move toggle, tabButton will not move regardless of whether it is first in the animation block or second.
Edit: I have tried moving them into separate blocks and to change the center point rather than the frame, to no avail. It seems that if the toggle view moves, the tabButton will not move.
Edit 2: The pictorial evidence.{
In the following screenshots tabButton bg is green and toggle bg is red.
Above: Initial position (toggle is off-screen) correct position
Above: The problem in question toggle is correct tabButton is not
Above: When self.toggle.frame = rect is commented out (tabButton correct, toggle not)
}
Edit 3: It's even worse than I feared.{
I have done a few more tests and even if I take the toggle change out of the animation block to make it an instant thing, the tabButton will still not animate. This makes me think the tabButton may just fundamentally dislike the toggle view and/or myself so will not move just to spite me.
}
Edit 4:{
If I change the tabButton animation to tabButton.frame = CGRectMake(10,10,100,100) the View snaps instantly to that location and animates back to its original position in the same time as the animation duration.
}
I better add more bookkeeping/TLDR information in case things aren't clear.
toggle is an instance of ToggleDraw which is a subview of UIView which I created.
tabButton is a UIButton which is part of my IB viewController and a property of the class
Both toggle and tabButton are subviews of self.view
The animations will work individually with no modifications to the logic of the rects but will not work if they are animated at the same time
toggle animation seems to take precedence over tabButton animation regardless of the order
I had a problem with the animation of an UIView created in IB (the animation didn't start from the current position of the view, and ended in the initial position).
All worked fine after sending layoutIfNeeded() to the underlaying view before the animation block:
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5) { () -> Void in
...
I think it is not a problem about a UIView Animation. Maybe your toggle posiztion is related to your tabButton. For a try, your can set toggle frame to a rect lick (10, 10, 100,100), then check the result.
I've created an example of what you describe and everything seems to work fine. This is what I used:
UIView *toggle = [[UIView alloc] initWithFrame:CGRectMake(320, 64, 100, 100)];
[toggle setBackgroundColor:[UIColor redColor]];
[self.view addSubview:toggle];
UIButton *tabButton = [[UIButton alloc] initWithFrame:CGRectMake(220, 64, 100, 100)];
[tabButton setBackgroundColor:[UIColor greenColor]];
[self.view addSubview:tabButton];
CGRect rect = toggle.frame;
CGRect tabRect = tabButton.frame;
rect.origin.x = rect.origin.x - rect.size.width;
NSLog(#"%f Before",tabRect.origin.x);
tabRect.origin.x = tabRect.origin.x - rect.size.width;
NSLog(#"%f After", tabRect.origin.x);
[UIView animateWithDuration:1 animations:^{ // animate the following:
toggle.frame = rect; // move to new location
tabButton.frame = tabRect;
}];
What I can suggest is to make sure that the code is being ran on mainthread:
dispatch_async(dispatch_get_main_queue(), ^{
[UIView animateWithDuration:0.3 animations:^{
self.toggle.frame = rect; // move to new location
self.tabButton.frame = tabRect;
}];
});
Also take into account that the log you have after the animation code is incorrect as it won't run after the animation, but rather right next to asking for the animation.
If you want code to run after the animation you should use:
[UIView animateWithDuration:0.3 animations:^{
self.toggle.frame = rect; // move to new location
self.tabButton.frame = tabRect;
} completion:^(BOOL finished){
NSLog(#"Finished animating!");
}];
I have found a solution to the problem. If I initialise the UIButton (tabButton) programmatically rather than through the interface builder, both views will animate simultaneously.
This however seems very hacky to me, kind of like putting a bandaid over a missing foot and hoping it will sort itself out.
I could not work out the root cause of the problem but at least I could avoid the symptoms.
If anyone knows why the views would not animate when the button was made in the interface builder post an answer here, I am interested in knowing the reason behind this.
Thanks for your help everyone.
I am trying to implement animations in my application. I just want to try a simple rotation of a button. The button itself is rotated, but also it changes its position and the rotation angle is different than the one I want. I have also added the autoresizesSubwievs = NO;
- (IBAction)rotateView:(id)sender
{
[UIView animateWithDuration:0.6f delay:0.1 options:UIViewAnimationOptionCurveEaseOut animations:^{
self.view.autoresizesSubviews = NO;
[self.buttoner setTransform:CGAffineTransformRotate(self.buttoner.transform, 90.0f)];
} completion:nil];
}
What am I doing wrong? Can you please help me?
EDIT:
I have two buttons, when the first gets pressed, I call the above method ... but this causes to move the first button and then to move the second button and rotate it with inappropriate angle. I dont understand that at all..
For the angle problem, Instead of passing 90, you should pass the radian value of the angle which is M_PI/2 .
[self.buttoner setTransform:CGAffineTransformRotate(self.buttoner.transform, M_PI/2)];
I have a problem with a UIView-subclass object that I am rotating using Core Animation in response to a UISwipeGesture.
To describe the context: I have a round dial that I have drawn in CG and added to the main view as a subview.
In response to swipe gestures I am instructing it to rotate 15 degrees in either direction dependent on whether it;s a left or right swipe.
The problem that it will only rotate each way once. Subsequent gestures are recognised (evident from other actions that are triggered) but the animation does not repeat. I can go left once then right once. But trying to go in either direction multiple times doesn't work. Here's the relevant code, let me know your thoughts...
- (IBAction)handleLeftSwipe:(UISwipeGestureRecognizer *)sender
{
if ([control1 pointInside:[sender locationInView:control1] withEvent:nil])
{
//updates the display value
testDisplay.displayValue = testDisplay.displayValue + 0.1;
[testDisplay setNeedsDisplay];
//rotates the dial
[UIView animateWithDuration:0.25 animations:^{
CGAffineTransform xform = CGAffineTransformMakeRotation(radians(+15));
control1.transform = xform;
[control1 setNeedsDisplay];
}];
}
CGAffineTransform xform = CGAffineTransformMakeRotation(radians(+15));
Do you keep a total of how far the rotation is. CGAffineTransformMakeRotation are not additive. Only the most recent is used. So you are setting it to 15 each time, not 15 more each time.
Here's a super simple example of rotating a view cumulatively. This rotates the view by 180 degrees each button press.
- (IBAction) onRotateMyView: (id) sender
{
[UIView animateWithDuration:0.3 animations:^{
myView.transform = CGAffineTransformMakeRotation(M_PI/2*rotationCounter);
} completion:^(BOOL finished){
//No nothing
}];
++rotationCounter;
}