currently I am moving uiviews from left to right on the swipe gesture of down how can I change transition to up and down
-(void)slideToRightWithGestureRecognizer:(UISwipeGestureRecognizer *)gestureRecognizer
{
[UIView animateWithDuration:0.5 animations:^{
self.calendar.frame = CGRectOffset(self.calendar.frame, 320.0, 0.0);
self.secondCalender.frame = CGRectOffset(self.secondCalender.frame, 320.0, 0.0);
}];
}
The last parameter in CGRectOffset is the vertical offset. Pass a non-zero value in that and you'll move the view up/down.
/* Offset `rect' by `(dx, dy)'. */
CGRect CGRectOffset(CGRect rect, CGFloat dx, CGFloat dy)
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Ive done a Scaling animation for background image with an arrow in it,well by scaling the image(it includes the arrow) meaning its a whole background. it scales from the center of the background. but i want to start scaling from the center of arrow.
i want to achieve this :
Then to become with scale:
What i have to change in my code:
self.blueBackground.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1, 1);
[UIView animateWithDuration:5 animations:^{
self.blueBackground.transform = CGAffineTransformScale(CGAffineTransformIdentity, 30, 30);
} completion:^(BOOL finished) {
}];
With my current code the scale start from center of background so the arrow end up at the right (out the bounds of screen).
Try something like this:
- (void)animateArrow
{
self.blueBackground.transform = CGAffineTransformIdentity;
[UIView animateWithDuration:5 animations:^{
ScaleViewAboutPointInBounds(self.blueBackground, arrowCenter, 30);
} completion:^(BOOL finished) {
}];
}
static void ScaleViewAboutPointInBounds(UIView *view, CGPoint point, CGFloat scaleAmount)
{
CGFloat xAnchor = view.layer.anchorPoint.x * CGRectGetWidth(view.bounds);
CGFloat yAnchor = view.layer.anchorPoint.y * CGRectGetHeight(view.bounds);
CGFloat xOffset = point.x - xAnchor;
CGFloat yOffset = point.y - yAnchor;
CGAffineTransform shift = CGAffineTransformMakeTranslation(-xOffset, -yOffset);
CGAffineTransform unshift = CGAffineTransformMakeTranslation(xOffset, yOffset);
CGAffineTransform scale = CGAffineTransformMakeScale(scaleAmount, scaleAmount);
view.transform = CGAffineTransformConcat(shift, CGAffineTransformConcat(scale, unshift));
}
It's probably more general than what you need, and you could do it simpler, but this should work too. Just change the point to something that looks like the center of the arrow.
I have two views side by side(left & right).At one time i am just showing one view other view not visible because i have moved that view out of scene towards the right of screen.I have set the x position in such a way so that it is not visible(view is always to the right of screen so not visible).So i press next button which is near to first view then my second view is visible & first view is hidden. I have used animation to slide thew view from left to right & right to left.
-(void)handleSingleTapGesture:(UITapGestureRecognizer *)tapGestureRecognizer
{
NSLog(#"first");
CGFloat screenWidth = 0.0;
if(IS_IPHONE_6)
{
screenWidth=self.view.frame.size.width-120.0;
}
if(IS_IPHONE_5)
{
screenWidth=self.view.frame.size.width-68.0;
}
NSLog(#"New screen width is %f",screenWidth);
[self.back_view setHidden:false];
[self.front_view setHidden:true];
[UIView animateWithDuration:0.5 animations:^{
self.front_view.frame = CGRectOffset(self.front_view.frame, -screenWidth, 0.0);
self.back_view.frame = CGRectOffset(self.back_view.frame, -screenWidth, 0.0);
}];
}
-(void)handleSingleTapGesture_one:(UITapGestureRecognizer *)tapGestureRecognizer
{
CGFloat screenWidth = 0.0;
if(IS_IPHONE_6)
{
screenWidth=self.view.frame.size.width-120.0;
}
if(IS_IPHONE_5)
{
screenWidth=self.view.frame.size.width-68.0;
}
NSLog(#"New screen width is %f",screenWidth);
[self.back_view setHidden:true];
[self.front_view setHidden:false];
[UIView animateWithDuration:0.5 animations:^{
self.front_view.frame = CGRectOffset(self.front_view.frame, screenWidth, 0.0);
self.back_view.frame = CGRectOffset(self.back_view.frame, screenWidth, 0.0);
}];
}
On the backView i have added a subview on bottom-right so when ever i try to add the view inside that view then then main view is shifted to the right i don't know why.Please tell me how can i get the solution?
Within the viewDidLoad method, I create a CGPoint with the min X and Y values from the frame of a view. Then I set the anchorPoint of that views layer to 0,0 and its position to the CGPoint. Then I apply a CGAffineTransformScale to make it 0,0 (hide it.) Whenever a user touches a button I want it to animate from its anchorPoint 0,0 (top-left) to full width and height. If the user presses again animate it to 0,0 . However the view is out of place (from the anchor point change) and whenever I scale it on the button press the pop-up animation is not equal to when the layer is animated to hide. That is whenever the layer is made visible you can see it transition from no width and height to full width and height but when it is made invisible it just disappears.
heres viewWillLayoutSubviews
self.original = CGPointMake(CGRectGetMinX(self.menu.frame), CGRectGetMinY(self.menu.frame));
self.menu.layer.anchorPoint = CGPointMake(0, 0);
self.menu.layer.position = self.original;
self.menu.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0, 0);
This is on button click logic
if(self.isMenuVisible)
{
//hide menu
[UIView animateWithDuration:.5 animations:^{
self.menu.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0, 0);
}];
self.isMenuVisible = NO;
}
else
{
//show it
[UIView animateWithDuration:.5 animations:^{
self.menu.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1, 1);
}];
self.isMenuVisible = YES;
}
I don't know why zero width and height will cause no animation, but there is a workaround, it is making its width and height scale to 0.01 and when the animation is complete, hide the menu.
if (self.menu.hidden) {
[UIView animateWithDuration:.5 animations:^{
self.menu.hidden = NO ;
self.menu.transform = CGAffineTransformIdentity ;
}] ;
} else {
[UIView animateWithDuration:.5 animations:^{
self.menu.transform = CGAffineTransformScale(self.viewTest.transform, 0.01, 0.01) ;
} completion:^(BOOL finished) {
self.menu.hidden = YES ;
}] ;
}
I am using a CircleView class that basically inherits off UIView and implements drawRect to draw a circle. This all works, hurrah!
What I cannot figure out though is how to make it so when I touch it (touch code is implemented) the circle grows or pops. Normally I'd use the UIKit animation framework to do this but given I am basically overriding the drawRect function to directly draw the circle. So how do I animate this?
- (void)drawRect:(CGRect)rect{
CGContextRef context= UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, _Color.CGColor);
CGContextFillEllipseInRect(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height));
}
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
// Animate?
}
The answers depends on what you mean by "grows or pops". When I hear "pop" I assume that the view scales up over a short period of time ans scales back down again to the original size. Something that "grows" on the other hand would scale up but not down again.
For something that scales up and down again over a short period of time I would use a transform to scale it. Custom drawing or not, UIView has build in support for animating a simple transform. If this is what you are looking for then it's not more then a few lines of code.
[UIView animateWithDuration:0.3
delay:0.0
options:UIViewAnimationOptionAutoreverse // reverse back to original value
animations:^{
// scale up 10%
yourCircleView.transform = CGAffineTransformMakeScale(1.1, 1.1);
} completion:^(BOOL finished) {
// restore the non-scaled state
yourCircleView.transform = CGAffineTransformIdentity;
}];
If on the other hand you want the circle to grow a little bit more on every tap then this won't do it for you since the view is going to look pixelated when it scales up. Making custom animations can be tricky so I would still advice you to use a scaling transform for the actual animation and then redraw the view after the animation.
[UIView animateWithDuration:0.3
animations:^{
// scale up 10%
yourCircleView.transform = CGAffineTransformMakeScale(1.1, 1.1);
} completion:^(BOOL finished) {
// restore the non-scaled state
yourCircleView.transform = CGAffineTransformIdentity;
// redraw with new value
yourCircleView.radius = theBiggerRadius;
}];
If you really, really want to do a completely custom animation then I would recommend that you watch Rob Napiers talk on Animating Custom Layer Properties, his example is even the exact thing you are doing (growing a circle).
If you want an animation that expands the ellipse from the centre, try this. In the header, define 3 variables:
BOOL _isAnimating;
float _time;
CGRect _ellipseFrame;
Then implement these 3 methods in the .m file:
- (void)drawRect:(CGRect)rect; {
[super drawRect:rect];
CGContextRef context= UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, _Color.CGColor);
CGContextFillEllipseInRect(context, _ellipseFrame);
}
- (void)expandOutward; {
if(_isAnimating){
_time += 1.0f / 30.0f;
if(_time >= 1.0f){
_ellipseFrame = self.frame;
_isAnimating = NO;
}
else{
_ellipseFrame = CGRectMake(0.0f, 0.0f, self.frame.size.width * _time, self.frame.size.height * _time);
_ellipseFrame.center = CGPointMake(self.frame.size.width / 2.0f, self.frame.size.height / 2.0f);
[self setNeedsDisplay];
[self performSelector:#selector(expandOutward) withObject:nil afterDelay:(1.0f / 30.0f)];
}
}
}
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer; {
if(_isAnimating == NO){
_time = 0.0f;
_isAnimating = YES;
[self expandOutward];
}
}
This is the most basic way you can animate the circle expanding from the centre. Look into CADisplayLink for a constant sync to the screen if you want more detailed animations. Hope that Helps!
I have a UIView at the bottom left of its superview, i.e.its frame is like
[myView setFrame:CGRectMake(0,superView.bounds.size.height-myViewHeight,myViewWidth,myViewHeight)];
I want to animate its size such that its bottom left point remains fixed at its position. I am not sure how to play with anchor point property of layers.
Currently I am increasing its size using the following lines of code.
[UIView animateWithDuration:0.2 animations:^{
[bottomLbl setFrame:CGRectMake(0, bottomView.bounds.size.height-250, 300, 250)];
This works fine but when I try to bring back to its original size, its bottom point gets lifted at the start of animation and settles down at the end of animation.
First define the point for the bottom left corner...
CGPoint bottomLeft = CGPointMake(0, 480); // this can be anything.
Then you need to define the sizes (big and small).
CGSize bigSize = CGSizeMake(280, 280);
CGSize smallSize = CGSizeMake(50, 50); // again, these can be anything.
Then animate them...
// create the rect for the frame
CGRect bigFrame = CGRectMake(bottomLeft.x, bottomLeft.y - bigSize.height, bigSize.width, bigSize.height);
CGRect smallFrame = CGRectMake(bottomLeft.x, bottomLeft.y - smallSize.height, smallSize.width, smallSize.height);
[UIView animateWithDuration:0.2
animations:^{
// set the rect onto the view
bottomLbl.frame = bigFrame;
// or
bottomLbl.frame = smallFrame;
}];
As long as you set the frame and the calculated end frames are correct and it's all done in one animation then the bottom left corner won't move.
If this doesn't help can you please post a video of what is happening (and all your animation code).
EDIT
[UIView animateWithDuration:0.2
delay:0.0
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
// set the rect onto the view
bottomLbl.frame = bigFrame;
// or
bottomLbl.frame = smallFrame;
}
completion:nil];