I am trying to understand how to get the bookcover open and close animation going in ios. Google search resulted this:
coverimage.layer.anchorPoint=CGPointMake(0, .5);
coverimage.center = CGPointMake(coverimage.center.x - coverimage.bounds.size.width/2.0f, coverimage.center.y);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationDelay:0.1];
coverimage.transform = CGAffineTransformMakeTranslation(0,0);
CATransform3D _3Dt = CATransform3DIdentity;
_3Dt = CATransform3DMakeRotation(3.141f/2.0f,0.0f,-1.0f,0.0f);
_3Dt.m34 = 0.001f;
_3Dt.m14 = -0.0015f;
coverimage.layer.transform =_3Dt;
[UIView commitAnimations];
It works great, but I am finding it hard to understand how it does the CATransform3DMakeRotation. If any direction or resources you have come across please let me know. My main motive is find a way so it reverses the action (Close the cover of the book). I have tried changing the code but didn't work. Thanks in advance.
Download the sample and follow the simple execution of the desired output from library -
Flip Animation
Above library supports 3 interaction modes:
Triggered: as in a tap to flip
Auto: as in a revolving flip that loops through data
Controlled: as in a pan gesture that moves the flip layer according to touch
Related
I have made a custom activity indicator to use in a project. I rotate a static loader image for that.
- (void) rotate {
lastInstance++;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(rotate)];
[UIView setAnimationDuration:0.1];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
spinnerImageView.layer.transform = CATransform3DMakeRotation(M_PI*(lastInstance%10)/5, 0.0, 0.0, 1.0);
[UIView commitAnimations];
}
The spinnerimageview is contained within a superview container, and it bears the static loader image. It works fine, except for crashing unpredictably without any error messages.
Looks like you're stuck in a never ending recursion. How do you decide when to stop the rotation?
Each time the rotation animation completes it simply calls rotate again, with seemingly no end in sight.
The crash you are seeing is likely a stack overflow (how apt).
I'd suggest rethinking how to you decide whether the animation could continue.
I have to give a delete thumbnail animation in my ipad application just like iphone/ipad applications delete effect.
Any body help me please sample photo is attached
If you need more details then kindly mention it in comments
I have done this using CGAffineTransformMakeRotation. Don't know there is some other better method. But What I have done is my logic you can copy that as it is and you just need to add a delete button on the left top of that view. In the following code I am just animating the thumbnail or any view just like iPad does on its home screen. One thing, You need to declare int direction globally. and every time when you will call this method you will set direction = 1;
-(void)shakeToDelete:(UIView *)shakeMe
{
[UIView animateWithDuration:0.1 animations:^
{
shakeMe.transform = CGAffineTransformMakeRotation(0.05 * direction);
}
completion:^(BOOL finished)
{
direction = direction * -1;
[self shakeToDelete:shakeMe];
}];
}
/// edit
I tried this way and got it working in my sample screen as attached in photo
You better should use an autoreverse and looped animation, cause creating animations over and over will fulfill the phone memory.
With this code, only one animation is retained.
view.transform = CGAffineTransformMakeRotation(-kDeleteAnimationAmplitude);
[UIView animateWithDuration:0.1 delay:0 options:UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse animations:^{
view.transform = CGAffineTransformMakeRotation(kDeleteAnimationAmplitude);
} completion:nil];
Then if you want to stop your animation, just call:
[view.layer removeAllAnimations];
I have been trying to build an entry effect for a logo to come from the top of the screen to the bottom and remain there when a new view loads in my application. I have seen all of the tutorials that use NSTimer to bounce an image but once my logo hits the bottom it needs to exit. I'm going to read up on animation block codes to see if my solution resides there.
Apologies I'm a new be and am very grateful for the assistance.
Set logo frame to top and then:
[UIView beginAnimations: #"moveLogo" context: nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:1.0];
[UIView setAnimationCurve: UIViewAnimationCurveLinear];
logoToMove.frame = CGRectMake( final frame at the bottom );
[UIView commitAnimations];
logoToMove is your logo, give it an outlet and hook it in xib.
So you will set the initial frame and in the animation - the final frame. The animation will do the rest of the job.
Change UIViewAnimationCurveLinear to a desired one if you don't like that. Also the duration to speed up or slow down the movement.
To remove the view at the end of your animation, the easiest way would be to use blocks :
logoToMove.frame = topRect;
[UIView animateWithDuration:duration
animations:^{
logoToMove.frame = bottomFrame;
}
completion:^(BOOL finished) {
[logoToMove removeFromSuperview];
}
];
Doing it like that gives you control over the animation and on what to do once it's finished in a single method
iPad - iOS 5.1 - Xcode 4.3.2
When the keyboard pop ups I animate the y origin of my UIImageView up by "x"
When the keyboard goes down, i animate it back down by the same "x"
So the keyboard pops up, the image goes up by X, the keyboard comes down, the image goes down by x, but it doesn't end up in the same place!. You go up 60, down 60, and you're not in the same place! it's further down, as if the coordinate system changed between the appearance of the keyboard and the disappearance of it. It absolutely drives me crazy. I can't understand why this happens.
//add gesture recognizer when keyboard appears
-(void)keyboardWillShow:(NSNotification *) note {
[self.view addGestureRecognizer:tapRecognizer];
// Setup the animation
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3f];
[UIView setAnimationCurve:UIViewAnimationOptionCurveEaseInOut];
[UIView setAnimationBeginsFromCurrentState:YES];
// The transform matrix: Logo Image
CGAffineTransform moveLogo = CGAffineTransformMakeTranslation(0, -60);
self.logoImageView.transform = moveLogo;
// Commit the changes
[UIView commitAnimations];
}
//add gesture recognizer when keyboard appears
-(void)keyboardWillHide:(NSNotification *) note {
[self.view removeGestureRecognizer:tapRecognizer];
// Setup the animation
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3f];
[UIView setAnimationCurve:UIViewAnimationOptionCurveEaseInOut];
[UIView setAnimationBeginsFromCurrentState:YES];
// The transform matrix: Logo Image
CGAffineTransform moveLogo = CGAffineTransformMakeTranslation(0, 60);
self.logoImageView.transform = moveLogo;
// Commit the changes
[UIView commitAnimations];
}
That's because you are not translating it, when you use CGAffineTransformMakeTranslation you are saying Give me these coordinates not give me this offset. In other words, make translation gives you the translation from the identity matrix. The function you want is CGAffineTransformTranslate. This will apply the translation to the current transform (passed as the first argument).
the transform property is not cumulative. You are not doing what you think you're doing. You are calculating the new transform from your identity, not from the current transform.
Instead of:
CGAffineTransform moveLogo = CGAffineTransformMakeTranslation(0, 60);
self.logoImageView.transform = moveLogo;
Try:
self.logoImageView.transform = CGAffineTransformIdentity;
Instead of messing around with Core Graphics you might want to animate simple view properties, like frame or size. For example:
[self.logoImageView.center = CGPointMake(self.logoImageView.center.x,
self.logoImageView.center.y + 60);
Do this between beginAnimations and commitAnimations
I have a custom UIView. It initializes two rectangular UIBezierPaths, and in drawRect it simply fills these two paths.
This view is placed on a button. When the button is clicked, a rotation is applied to it inside an animateWithDuration block:
icon.transform = CGAffineTransformMakeRotation(M_PI*-0.25);
This works great.
When the button is clicked again, I am trying to make the view rotate back to it's original orientation (reverse the rotation). I have tried:
icon.transform = CGAffineTransformInvert(icon.transform);
icon.transform = CGAffineTransformMakeRotation(M_PI*0.25);
icon.transform = CGAffineTransformIdentity;
... and a number of other variations, but none of them seem to work. Instead, the view is distorted until it's no longer visible -- sorta stretched to nothing. Sometimes, reapplying the first transform brings it back but with other reversals it doesn't.
What am I doing wrong?
In ios the transform is always relative, so once transformation is done, the next transformation should be relative to the previous transformation. You can simply change the frame of the view and revert it back to normal on second button click. On even clicks you will have to revert back the frame. Implement the following code. You can use the block level code if you feel comfortable with it as it is the new norm.
int noOfClicks = 0;
-(IBAction)yourBtnAction:(id)sender
{
noOfClicks++;
if(noOfClicks %2 != 0)
{
[UIView beginAnimations:#"Rotate" context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationDelegate:self];
CGRect frame=yourView.frame;
frame.origin.y+=20;
yourview.frame=frame;
[UIView commitAnimations];
}
else
{
[UIView beginAnimations:#"Rotate" context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationDelegate:self];
CGRect frame=yourView.frame;
frame.origin.y-=20;
yourview.frame=frame;
[UIView commitAnimations];
}
}
If you don't want to make so many change you can use following to revert back but employing same logic:
[UIView beginAnimations:#"Rotate back" context:nil];
[UIView setAnimationDuration:1.0];
yourView.transform = CGAffineTransformIdentity;
[UIView commitAnimations];