I am using storyboard and have implemented a custom UIVIew which draws concentric circles. I am using constraints to keep the UIView horizontally centric and this is working fine when I rotate my device. But my shape layers are not adjust properly on rotation. I tried printing the self.frame and when I launch the app being in landscape mode, the UIView frame it assumes is that of Portrait mode though my UIView is rotate properly (checked by keeping background color to black). I am calling setNeedsDisplay in handleViewRotation below which brings the view to correct mode if I rotate the device. But once it is in that view and I go out of the current screen and rotate the device and come back then UIView gets adjusted but layers remains on the same place (with previous orientation assumption).
Any idea how to fix this and adjust layers.
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(didRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
- (void)didRotate:(NSNotification *)iNotification {
[self.myView handleViewRotation];
}
- (CAShapeLayer *)circleForRadius:(CGFloat)iRadius withColor:(CGColorRef)iColor andDashPattern:(BOOL)isDashPattern {
CAShapeLayer *aSignalcircle = [CAShapeLayer layer];
aSignalcircle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(self.frame.size.width / 2.0, 0.0, 2.0 * iRadius, 2.0 * iRadius) cornerRadius:iRadius].CGPath;
aSignalcircle.position = CGPointMake(0.0 - iRadius, 0.0 - iRadius);
aSignalcircle.fillColor = [UIColor clearColor].CGColor;
aSignalcircle.strokeColor = iColor;
aSignalcircle.lineWidth = kPSSignalStrokeWidth;
if (self.enableShadow) {
aSignalcircle.shadowColor = [UIColor blackColor].CGColor;
aSignalcircle.shadowOpacity = 0.5;
aSignalcircle.shadowOffset = CGSizeMake(0, 0.25);
aSignalcircle.shadowRadius = 0.5;
}
if (isDashPattern) {
aSignalcircle.lineDashPattern = #[#1, #1];
}
return aSignalcircle;
}
The issue was that core graphics draws faster than than UI orientation notification. Using next run loop to draw the UI and fading effect makes it look better.
I added below piece of code to make it work:
- (void)viewDidAppear:(BOOL)iAnimated {
[super viewDidAppear:iAnimated];
double delayInSeconds = 0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[self.myView handleViewRotation];
});
[UIView animateWithDuration:1.0 delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
self.beaconView.alpha = 1.0;
} completion:nil];
Related
What I have:
I have a UIView (named pView) which has as sublayer a CAGradientLayer. Practically is this:
ViewController -> View ->pView -> CAGradientLayer
This is the code that creates all this:
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UITestView * pView = nil;
UIColor * scolor = nil, *ecolor = nil;
self.view.backgroundColor = [UIColor yellowColor];
pView = [[UITestView alloc] initWithFrame: CGRectMake(self.view.frame.origin.x, 100.0, self.view.frame.size.width, 100.0)];
scolor = [UIColor colorWithRed:(14/255.0) green: (238/255.0) blue:(123/255.0) alpha:1];
ecolor = [UIColor colorWithRed:(6/255.0) green: (216/255.0) blue:(69/255.0) alpha:1];
// creating the gradient layer
CAGradientLayer * layer = [[CAGradientLayer alloc] init];
layer.frame = self.bounds;
layer.colors = #[(id)scolor.CGColor,(id)ecolor.CGColor];
[pView.layer insertSublayer:layer atIndex:0];
// creating a tapGestureRecognizer
[pView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapInViews:)]];
[self.view addSubview:pView];
touched = NO;
}
....
#end
What I'm trying to do
Once a tap gesture is detected over pView I want to increase the height of pView by 100.0 but animatedly. If pView was previously touched (that is, its height was already increased by 100.0) I want to decrease the height of pView by 100.0 (that is, returning it to its original size);
What I already know
I know that since I want to change the frame of pView I must change also the frame (or bounds) of the CAGradientLayer attached to pView. Since I want to animate these changes, I want these animations occurs at the same time and have the same duration.
I know that the frame (or bounds) of a layer is only animatable inside an animation block.
What I do:
This is the option I've test:
- (void) handleTapInViews: (nonnull UITapGestureRecognizer *) sender {
pView = sender.view;
if (touched) {
[UIView animateWithDuration:0.4 animations:^{
pView.frame = CGRectMake(pView.frame.origin.x, pView.frame.origin.y, pView.frame.size.width, pView.frame.size.height - 100.0);
pView.layer.sublayers[0].frame = pView.bounds;
[self.view setNeedsLayout];
} completion:^(BOOL finished) {
touched = NO;
}];
}
else {
[UIView animateWithDuration:0.4 animations:^{
pView.frame = CGRectMake(pView.frame.origin.x, pView.frame.origin.y, pView.frame.size.width, pView.frame.size.height + 100.0);
pView.layer.sublayers[0].frame = pView.bounds;
[self.view setNeedsLayout];
} completion:^(BOOL finished) {
touched = YES;
}];
}
}
This option actually works (that is, both the frame of pView and the frame of the layer change animatedly) but they are not synchronised; that is, the changes in the frame of the layer are slightly (but perceptible) more faster than the changes in the frame of pView. This effect is more evident when the height of pView is decreased.
I 've also read about CABasicAnimation and CAAnimationGroup, in order to animate both the bounds and position of the layer. In this case also the animation of the layer is bit faster than the animation of the view (it is perceptible and it is not a matter of seconds in case anyone ask about setting duration or whatever) and also in this case, after the animation the bound of the layer return to its original size which is not the desired effect. I already know this last matter can be fixed assigned the new values to the layer at the end of the animation but I certainty do not know where in my code put that.
Most of what i've read regarding this other option is from these links:
link1
link2
link3
link4
In any case, does anybody please knows how can I fix this?? thanks in advance.
Well I ended setting the backgroundColor of Pview as ecolor = [UIColor colorWithRed:(6/255.0) green: (216/255.0) blue:(69/255.0) alpha:1. This way, the effect I commented about the animation of the layer been faster than the animation of the view is not noticeable now. I think maybe this is not the proper answer but it suit me.
I would like to generate a shockwave effect when I tap on a circular UIView. The effect I'm looking for is very similar to 'Circadia' on the App Store.
(source: mzstatic.com)
Note the circular line that is expanding from the centre view. I couldn't find any kind of tutorial, so I tried the effect using a cheat:
-(void)startShockwave:(UIView *)target
{
// Replace the view tapped with one that will expand
UIView *wave = [[UIView alloc]initWithFrame:target.frame];
wave.backgroundColor = target.backgroundColor;
wave.alpha = 0.5;
wave.layer.masksToBounds = YES;
wave.layer.cornerRadius = wave.frame.size.width / 2;
// Hide it below the original view
[self.view insertSubview:wave belowSubview:target];
CGRect frame = wave.frame;
// Create a view that is the same colour as self.view to make it look like a hole
UIView *center = [[UIView alloc]initWithFrame:CGRectMake(frame.origin.x + 10, frame.origin.y + 10, frame.size.width - 20, frame.size.height - 20)];
center.backgroundColor = self.view.backgroundColor;
center.layer.masksToBounds = YES;
center.layer.cornerRadius = center.frame.size.width / 2;
[self.view insertSubview:center aboveSubview:wave];
// Hide the original view
target.alpha = 0;
// IMPORTANT: I send these views behind the others so that center does not overlap them
[self.view sendSubviewToBack:center];
[self.view sendSubviewToBack:wave];
[UIView animateWithDuration:0.4 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
CGAffineTransform waveTransform = wave.transform;
CGAffineTransform centerTransform = center.transform;
// Expand the views to look like a shockwave
wave.transform = CGAffineTransformScale(waveTransform, 4, 4);
center.transform = CGAffineTransformScale(centerTransform, 5.75, 5.75);
// Fade the wave out to nothing
wave.alpha = 0;
} completion:^(BOOL finished) {
// Remove the shockwave
[wave removeFromSuperview];
[center removeFromSuperview];
}];
}
This works quite well...
...With only one shockwave. However, when they intersect, one center overlaps the other due to the most recent shockwave being sent to the back.
I would prefer intersecting shockwaves to be more like this:
I'm not sure how to create this type of effect, however, so any help is much appreciated!
Use [UIColor clearColor] to make the center of your circle transparent (so you can see interface elements residing beneath it).
center.backgroundColor = [UIColor clearColor];
It's a quick fix! You already did most of it. Just change this line:
center.backgroundColor = self.view.backgroundColor;
to
center.backgroundColor = [UIColor clearColor];
I have a little message that appears when the app is conecting to the server.
It works nice when the app is launching, and also the rest of the time that the app needs to show this message, but if I sleep the app, I put it on the background and then I wake it up, the message appears again but the whole frame moves up, see screenshots.
The first one is right after launching, that message on the bottom appears and it dissapears correctly, and the view is back to what is used to be, perfect.
But the second screenshot is the result of making the app going to background, and then waking it up, on the "applicationDidBecomeActive" I have a method that requires conection to the server and therefore the small view must appear. The problem is that the window or the navigation controller moves up behind the status bar. And leaves that white space
Heres the code that I use to make shorter the navigation view and add that message view and make it longer again.
- (void)addMessageView:(NSString *)message{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
if(![window viewWithTag:3]){//Si no hay un messageView no lo meto.
[window addSubview:messageView];
CGRect frameWindow = window.frame;
int heightMessage = 50;
messageView.frame = CGRectMake(0, frameWindow.size.height, 320, heightMessage);
UINavigationController *nav = window.rootViewController;
//Pillo el UILabel y lo seteo
UILabel *label = (UILabel *)[messageView viewWithTag:1];
label.text = message;
CGSize maximumLabelSize = CGSizeMake(296,9999);
CGSize sizeMsg = [label.text sizeWithFont:label.font constrainedToSize:maximumLabelSize lineBreakMode:label.lineBreakMode];
UIActivityIndicatorView *activity = (UIActivityIndicatorView *)[messageView viewWithTag:2];
int xLabel = (320 - (sizeMsg.width + activity.frame.size.width + 5))/2;
CGRect frameActivity = activity.frame;
activity.frame = CGRectMake(xLabel, 13, frameActivity.size.width, frameActivity.size.height);
label.frame = CGRectMake(xLabel + activity.frame.size.width + 5, 15, sizeMsg.width, sizeMsg.height);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
nav.view.frame = CGRectMake(frameWindow.origin.x, frameWindow.origin.y, frameWindow.size.width, frameWindow.size.height - heightMessage);
messageView.frame = CGRectMake(0, frameWindow.size.height - heightMessage, 320, heightMessage);
[UIView commitAnimations];
}
}
AND also to put it back to the previous position:
- (void)hideMessageView{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
UINavigationController *nav = window.rootViewController;
CGRect frameWindow = window.frame;
if([window viewWithTag:3]){//Si no hay un messageView no lo meto.
[UIView animateWithDuration:0.3
animations:^{
nav.view.frame = CGRectMake(frameWindow.origin.x, frameWindow.origin.y, frameWindow.size.width, frameWindow.size.height);
messageView.frame = CGRectMake(0, frameWindow.size.height +5 , 320, 0);
}
completion:^(BOOL finished){
[messageView removeFromSuperview];
}];
}
NSLog(#"Tam Window: %# y nav %#", frameWindow, nav.view.frame);
}
Let me know what do you think.
Try disabling Autolayout, I had the same issue with my UI.
I'm attempting to fade in a UIView that I've created by animating the alpha. I need to fade it in, leave it visible for a few seconds, then fade it out.
The fade out function works fine. The view smoothly disappears. But the fade in just makes the view appear instantly instead of slowly appearing over an interval of 0.5 seconds.
So it seems like the fade in animation isn't working, just instantly setting the alpha to 1.0. I'm kind of at a loss here. Any ideas what I'm doing wrong? Thanks!
-(void)presentPopupPhrase:(NSString *)phrase
inView:(UIView *)view
withDelegate:(id)delegate
andCompletion:(void (^)(BOOL completed))completion {
MessagePopupView *pv = [[[MessagePopupView alloc] initWithFrame:self.frame andText:phrase] autorelease];
pv.alpha = 0.0;
[view addSubview:pv];
[self fadeInMPV:pv
withDuration:self.fadeDuration
andDelay:self.fadeInDelay];
[self fadeOutMPV:pv
withDuration:self.fadeDuration
afterDelay:self.fadeOutDelay
withCompletion:completion
andDelegate:delegate];
}
-(void)fadeInMPV:(MessagePopupView *)mpv
withDuration:(NSTimeInterval)duration
andDelay:(NSTimeInterval)delay
{
[UIView animateWithDuration:duration
delay:delay
options:UIViewAnimationOptionCurveLinear
animations:^{
mpv.alpha = 1.0;
}
completion:nil];
}
-(void)fadeOutMPV:(MessagePopupView *)mpv
withDuration:(NSTimeInterval)duration
afterDelay:(NSTimeInterval)delay
withCompletion:(void (^)(BOOL completed))completion
andDelegate:(id)delegate
{
[UIView animateWithDuration:duration
delay:delay
options:UIViewAnimationOptionCurveLinear
animations:^{
mpv.alpha = 0.0;
}
completion:completion];
}
EDIT:
If it helps, here's the VC code where I'm calling it from:
-(void)viewDidAppear:(BOOL)animated {
CGRect phraseFrame = CGRectMake(20, 341, 280, 65);
PopupPhraseController *phraseController = [[[PopupPhraseController alloc] initWithFrame:phraseFrame] autorelease];
[phraseController presentPopupPhrase:#"Test Phrase" inView:self.view withDelegate:self andCompletion:^(BOOL completed){
if (completed) {
NSLog(#"completed");
} else {
NSLog(#"not completed");
}
NSLog(#"blocked!");
}];
[super viewDidAppear:animated];
}
You can't chain the animations like that as the second animation block essentially causes the first one to be cancelled out.
You have two options for Linking Multiple Animations Together:
Use the completion handler of the first animation
Nest the animations but delay the second one
Looks something like this
[UIView animateWithDuration:self.fadeDuration
delay:self.fadeInDelay
options:UIViewAnimationOptionCurveLinear
animations:^{
pv.alpha = 1.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:self.fadeDuration
delay:self.fadeOutDelay
options:UIViewAnimationOptionCurveLinear
animations:^{
pv.alpha = 0.0;
} completion:completion];
}];
Looks something like this
[UIView animateWithDuration:self.fadeDuration
delay:self.fadeInDelay
options:UIViewAnimationOptionCurveLinear
animations:^{
pv.alpha = 1.0;
[UIView animateWithDuration:self.fadeDuration
delay:self.fadeOutDelay + self.fadeDuration
options:UIViewAnimationOptionCurveLinear
animations:^{
pv.alpha = 0.0;
} completion:completion];
} completion:nil];
The issue is because of the way you are setting up the animations.
When you set animatable properties on a view the backing model of the view is updated instantly. So when you set the alpha = 1.0 in the first block the backing data model for the view has the alpha as 1.0 and then the actual animation is kicked off on another thread to show the interpolation between the two values.
When you define the second block straight after the first the view essentially says "ok I need to animate from 1.0 (my current value in the model) to 0.0", which is why you don't see what you expected.
Thanks to Paul.s for dropping the hint there. I think this expected behaviour is a little weird, even if it seems logical from a low level perspective.
To expand on Paul's 2 solutions, there is a 3rd solution which is better IMO.
Use GCD to add a delay to the fade out code, like such:
//Make sure this delay exceeds your fade-in time...
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[self fadeOutMPV:pv
withDuration:self.fadeDuration
afterDelay:self.fadeOutDelay
withCompletion:completion
andDelegate:delegate];
});
This solution's better because the executing view controller has complete control on not only when, but what gets to trigger the fade out (for example, a user action).
The following code is a method I created inside a UIViewController to popup/down a "reader" overlay on top of the controller's own view. The intention is for the reader to begin as transparent, size zero, at a specific point. "Popup" is then animated as increasing in opacity and size, and shifts towards an application frame central position. "Popdown" is subsequently animated as the reverse, shrinking back whilst moving toward a specified location, fading out.
The popup code works exactly as desired. However, the popdown version (i.e. code executed if isPopup == NO) immediately changes the bounds rather than doing so gradually. Thus the popdown animation shows from the beginning a 1 pixel square view moving towards its destination and fading out.
-(void)popupReader:(BOOL)isPopup from:(CGPoint)loc {
CGFloat newAlpha = 0.0f;
CGPoint newCenter = CGPointZero;
CGRect newBounds = CGRectZero;
CGRect appFrame = [UIScreen mainScreen].applicationFrame;
CGSize readerSize = [self viewSize];
if (isPopup) {
newAlpha = 1.0f;
newCenter = CGPointMake(appFrame.origin.x+appFrame.size.width/2,
appFrame.origin.y+appFrame.size.height/2);
newBounds = CGRectMake(0,0,readerSize.width,readerSize.height);
[self.view setAlpha:0.0f];
[self.view setCenter:loc];
[self.view setBounds:CGRectMake(0, 0, 0, 0)];
} else {
newCenter = loc;
newBounds = CGRectMake(0,0,1,1);
}
const CGFloat animDur = 0.3f;
[UIView transitionWithView:self.view
duration:animDur
options:UIViewAnimationOptionTransitionNone|UIViewAnimationOptionCurveEaseOut
animations:^{
self.view.alpha = newAlpha;
self.view.center = newCenter;
self.view.bounds = newBounds;
}
completion:nil];
}
I've already tried animating just the frame, rather than bounds and center, but the result was identical.
Does anyone know why this is happening, and how I can overcome this problem?
Many thanks for your time.
from the docs:
UIViewAnimationOptionTransitionNone -
An option for specifying that no transition should occur.
try one of:
UIViewAnimationOptionTransitionFlipFromLeft
UIViewAnimationOptionTransitionFlipFromRight
UIViewAnimationOptionTransitionCurlUp
UIViewAnimationOptionTransitionCurlDown
Edit:
Or if you're just looking to animate those values, try
[UIView animateWithDuration:(NSTimeInterval)duration
animations:(void (^)(void))animations
completion:(void (^)(BOOL finished))completion];