I got strange behaviour when setting the rootViewController programatically. I am using xib's only and here are scenarios of what I already tried.
When I use this code, there is a small blink of black screen before it loads VC correctly.
- (void)setRootVC:(UIViewController *)viewController {
UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
[UIView transitionWithView:window
duration:0.0
options:UIViewAnimationOptionTransitionNone
animations:^{ window.rootViewController = viewController; }];
}
When I use different function, it eliminates the blink, but there's another strange behaviour. I got bunch of textfields in the new VC and I am setting one of them to becomeFirstResponder in viewDidLoad method, but when the VC loads, the textFieldDidEndEditing is called, which is totally strange. Here's the code.
- (void)setRootVC:(UIViewController *)viewController {
UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
[UIView transitionFromView:window.rootViewController.view
toView:viewController.view
duration:0.0
options:UIViewAnimationOptionTransitionNone
completion:^(BOOL finished){
window.rootViewController = viewController;
}];
}
I am restricted with objective-C, so swift solutions will not be helpful. Thanks for the replies.
The blink is caused due to you are setting the rootViewController in completion where is it should be in animation block, so the code below might be helpful for you..
[UIView transitionWithView:self.window
duration:0.5
options:UIViewAnimationOptionTransitionNone
animations:^{ self.window.rootViewController = viewController; }
completion:nil];
Instead of using UIViewAnimationOptionTransitionNone you might want to add some transition effect so, you can use UIViewAnimationOptionTransitionCrossDissolve instead, it might look better..
Hope it helps.
Cheers.
Related
I've read many question about this issue but I don't figure out what it doesn't work.
Basically I want to change my root controller after the user logged in the or logout from the app. I am also using the storyboard.
My problem is SILoginViewController dealloc's function is never called, in this controller I send Notification and the observer is not removed, so it mess up everything, and after several "login/logout" it receives several notifications.
My AppDelegate :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self.window setFrame:[[UIScreen mainScreen] bounds]];
BOOL isLoggedIn = [[SIUser aUser] isLoggedIn]; // from your server response
NSString *storyboardId = isLoggedIn ? #"rootViewController" : #"navVcForLogin";
self.window.rootViewController = [self.window.rootViewController.storyboard instantiateViewControllerWithIdentifier:storyboardId];
return YES;
}
If the user was not logged in and he success the process a Notification is send, here is the handler where I want to change the rootViewController :
- (void)loginSuccessHandler:(id)sender
{
UIStoryboard *sb = [UIStoryboard storyboardWithName:#"Storyboard" bundle:nil];
SIRootViewController * vc = [sb instantiateViewControllerWithIdentifier:#"rootViewController"];
[UIApplication sharedApplication].keyWindow.rootViewController = vc;
}
This is the same process for the logout, and here is the notification's handler :
- (void)logoutHandler:(id)sender
{
UIWindow *myWindow = [(SIAppDelegate *)[[UIApplication sharedApplication] delegate] window];
SILoginViewController * vc = [sb instantiateViewControllerWithIdentifier:#"navVcForLogin"];
[UIApplication sharedApplication].keyWindow.rootViewController = vc;
}
The easiest is to show you directly the storyboard :
The implementation in the Storyboard could seems weird but I'm using https://github.com/romaonthego/RESideMenu
I followed their storyboard implementation.
The thing is the SILoginViewController dealloc's method is never called.
But by the way it is working fine, in appearance I mean, when I run the application the behaviour is the good one, but It is sure it will mess out later on.
UPDATE
And I guess it is the common behaviour but there is no transition when the root view controller is changed and there is a black screen for a really short time when the new controller is appearing.
Black screen resolved using : in my AppDelegate.m
- (void)changeRootViewController:(UIViewController*)newRootViewController
{
if (!self.window.rootViewController) {
self.window.rootViewController = newRootViewController;
return;
}
UIView *snapShot = [self.window snapshotViewAfterScreenUpdates:YES];
[newRootViewController.view addSubview:snapShot];
self.window.rootViewController = newRootViewController;
[UIView animateWithDuration:0.3 animations:^{
snapShot.layer.opacity = 0;
snapShot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
} completion:^(BOOL finished) {
[snapShot removeFromSuperview];
}];
}
RootViewController Switch Transition Animation
This probably kind of a duplicate question but I spent hours to figure out this problem.
[currentRootViewController willMoveToParentViewController:nil]; // notify the VC of movements
[self addChildViewController:newRootViewController]; //Add the new VC
[self transitionFromViewController: currentRootViewController toViewController: newRootViewController
duration: 0.15 options:UIViewAnimationOptionCurveEaseInOut
animations:^{
newRootViewController.view.frame = currentRootViewController.view.frame;
}
completion:^(BOOL finished) { //Cleanup from the move
[currentRootViewController removeFromParentViewController];
[newRootViewController didMoveToParentViewController:self];
}];
The code for willMoveToParentViewController and didMoveToParentViewController will notify the ViewController of the changes, and should get your dealloc called, since there is now nothing holding onto the ViewController, unless you have a pointer to it somewhere, then you will need to nullify all your pointers to the code. The solution you tried is only half of what needs to go on to get the transition completed successfully.
I just tried my making a custom transition between view controllers. It basically spins the next one into view, and it works. Except that the source view controller flickers briefly back into visibility right as the animation completes, just as the destination view controller achieves its final position.
I'm also getting a warning about Unbalanced calls to begin/end appearance transitions which I'm still working on fixing-- I don't know if they're related.
Does anyone see anything here that jumps out as not quite right that would cause a flicker?
I then just assigned a button to do a custom segue via storyboard editor.
-(void)perform
{
UIViewController *source = self.sourceViewController;
UIViewController *destination = self.destinationViewController;
[source.view addSubview:destination.view];
destination.view.transform = CGAffineTransformMakeRotation(M_PI / 2);
[UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
destination.view.transform = CGAffineTransformMakeRotation(0);
}completion:^(BOOL finished){
[destination.view removeFromSuperview];
[source presentViewController:destination animated:NO completion:NULL];
}];
}
Take out the removeFromSuperview.
What i want to achieve is: after tapping a small view with some data i want to make it full screen and possibly make it to be a new vc.
For now I animate uiview to full screen with great success, but whole logic of this view is in it's "parent".
Is it possible to animate viewcontroller out of the uiview which is similar (for. eg. like in LayoutTransitions in Android SDK)?
Sample code of my uiview to full screen using autolayout:
sender.view.transform = CGAffineTransformIdentity;
[UIView animateWithDuration:0.2
animations:^{
sender.view.frame = self.view.window.bounds;
} completion:^(BOOL finished) {
[((CSTicketView*)sender.view) showMenu];
}];
[[UIApplication sharedApplication]
setStatusBarHidden:YES
withAnimation:UIStatusBarAnimationFade];
[[self navigationController] setNavigationBarHidden:YES animated:YES];
Let's move your sender view to Window as like below,
AppDelegate * appDelegate = (AppDelegate *) [[UIApplication sharedApplication] delegate];
[appDelegate.window addSubview:sender.view];
[UIView animateWithDuration:0.2
animations:^{
sender.view.frame = self.view.window.bounds;
} completion:^(BOOL finished) {
[((CSTicketView*)sender.view) showMenu];
}];
Absolutely possible.
You can use the new view controller transitions model in iOS7.
I would definitely recommend a few resources to check on top of my basic explanation:
this
and this
I have some sample code for a demonstrator of this here
Ultimately you make a new view controller for the view you are transitioning to, and you also make an NSObject subclass that conforms to UIViewControllerAnimatedTransitioning which contains the code to transition between them. Sounds complex but if you watch the video I linked to and read the other reference it'll make total sense.
I am integrating Pushwoosh SDK for Push Notification, which is using UIWindow to represent HTML page sent from Pushwoosh portal
- (void) showWebView {
self.richPushWindow.alpha = 0.0f;
self.richPushWindow.windowLevel = UIWindowLevelStatusBar + 1.0f;
self.richPushWindow.hidden = NO;
self.richPushWindow.transform = CGAffineTransformMakeScale(0.01, 0.01);
[UIView animateWithDuration:0.3 animations:^{
self.richPushWindow.transform = CGAffineTransformIdentity;
self.richPushWindow.alpha = 1.0f;
} completion:^(BOOL finished) {
}];
}
- (void) showPushPage:(NSString *)pageId {
NSString *url = [NSString stringWithFormat:kServiceHtmlContentFormatUrl, pageId];
HtmlWebViewController *vc = [[HtmlWebViewController alloc] initWithURLString:url];
vc.delegate = self;
vc.supportedOrientations = supportedOrientations;
self.richPushWindow.rootViewController = vc;
[vc view];
}
And on closing on HTML page it calls
self.richPushWindow.transform = CGAffineTransformIdentity;
[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
self.richPushWindow.transform = CGAffineTransformMakeScale(0.01, 0.01);
self.richPushWindow.alpha = 0.0f;
} completion:^(BOOL finished) {
AppDelegate * appDelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];
self.richPushWindow.hidden = YES;
}];
Now I want to call my view controller on closing of this HTML page. So I tried to present myviewcotrlller in this block completion but not presenting.
Actually here problem is that there are two UIWindows in my app one of app and other used by sdk. Now if i try to present view controller from this html page which is on separate UIWindow so it creates a separate hierarchy and when i close this window also removes my presented viewconroller due to parent-child relationship. And if do not close this window then how to come back to actual flow of app.
I want that new controller should be presented from that new window and after that window should be close and flow of app should not be affected by additional window. Is it possible? If my concept is wrong, Please help if anyone has idea
Edit: second uiwindow never be key window, it only becomes visible by setting higher windowlevel and become hidden
The problem is that right after this completion block richPushWindow will be gone, effectively this means you are trying to present view controller on a hidden window.
The solution is very simple. Use main window to present view controller. Some pseudocode:
Add view from the ViewContoller to the main window subviews:
[appDelegate.window addSubview:myViewController.view];
Modal:
[appDelegate.window.rootViewController presentModalViewController:myViewController]
Using View Controller hierarchy:
Push your viewController to the main viewController stack. For example if you have navigationController, just push it there.
I hope it helps!
I have a view controller which is not fullscreen (has a status bar) and want to present a modal view controller which is fullscreen.
If I hide the status bar at the beginning of the animation (parent's viewWillDisappear or modal's viewWillAppear) then for a moment the parent will be visible without a status bar, looking like a bug.
If I do it at the end of the animation (parent's viewDidDisappear or modal's viewDidAppear) then the status bar will be visible for a moment over the modal view, i.e. it won't appear as the modal view "covered it".
Is there a way to do this nicely?
edit:
One possibility would be to create a UIWindow with windowLevel=alert for at least the duration of the animation. The sample iAd ad seems to cover the status bar nicely without another window, so it must be possible somehow.
Another fun little project. This was the best I could come up with. It's not too bad if you don't mind using your own container controller to manage presenting/dismissing view controllers. I try to do things in a general way but this could be rolled into an app w/ the ContainerViewController if desired.
Note that I only implemented the equivalent of UIModalTransitionStyleCoverVertical. You can customize the animation however you like as well.
Relevant animation code:
- (void)presentViewController:(UIViewController *)viewControllerToPresent
{
// do nothing if no controller
if (!viewControllerToPresent) return;
[__viewControllers addObject:viewControllerToPresent];
CGRect toFrame = viewControllerToPresent.view.frame;
toFrame.origin = CGPointMake(0, CGRectGetMaxY(self.view.bounds));
viewControllerToPresent.view.frame = toFrame;
[UIView transitionWithView:self.view
duration:0.2
options:UIViewAnimationOptionTransitionNone
animations:^{
[[UIApplication sharedApplication] setStatusBarHidden:viewControllerToPresent.wantsFullScreenLayout withAnimation:UIStatusBarAnimationSlide];
[self.view addSubview:viewControllerToPresent.view];
viewControllerToPresent.view.frame = [UIScreen mainScreen].applicationFrame;
}
completion:nil];
}
- (void)dismissViewController
{
// nothing to dismiss if showing first controller
if (__viewControllers.count <= 1) return;
UIViewController *currentViewController = [__viewControllers lastObject];
UIViewController *previousViewController = [__viewControllers objectAtIndex:__viewControllers.count - 2];
[UIView transitionWithView:self.view
duration:0.2
options:UIViewAnimationOptionTransitionNone
animations:^{
[[UIApplication sharedApplication] setStatusBarHidden:previousViewController.wantsFullScreenLayout withAnimation:UIStatusBarAnimationSlide];
CGRect toFrame = currentViewController.view.frame;
toFrame.origin = CGPointMake(0, CGRectGetMaxY(self.view.bounds));
currentViewController.view.frame = toFrame;
}
completion:^(BOOL finished) {
[currentViewController.view removeFromSuperview];
[__viewControllers removeLastObject];
}];
}
I do that in my app with this code:
[[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleBlackOpaque];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation: UIStatusBarAnimationSlide ];
DocumentListViewController * dl = [[DocumentListViewController alloc] initWithNibName:#"DocumentListView" bundle:nil] ;
UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController:dl];
[dl release];
// Go to the list of documents...
[[self.view superview] addSubview:nav.view];
nav.view.alpha = 0.0 ;
[self hideActivityAlert];
[UIView animateWithDuration:1.0 animations:^{
nav.view.alpha = 1.0; } completion:^(BOOL A){
[self.view removeFromSuperview];
[self release];} ];
The status bar is presented shoftly while the animation occurs.
You have to be sure that the first view, when status bar is going hidden will fill the space. Use the property autoresizingMask with proper value.
Here's a solution that seems to work. You can derive the viewcontroller you want to present modally from my TSFullScreenModalViewController, or you can just implement the code right in the view controller itself.
#interface TSFullScreenModalViewController : UIViewController
{
UIWindow* _window;
}
- (void) presentFullScreenModal;
#end
#implementation TSFullScreenModalViewController
- (void) viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear: YES];
[_window resignKeyWindow];
[_window release];
_window = nil;
}
- (void) presentFullScreenModal
{
UIViewController* rvc = [[UIViewController new] autorelease];
rvc.view.backgroundColor = [UIColor clearColor];
_window = [[UIWindow alloc] initWithFrame: [UIScreen mainScreen].bounds] ;
_window.windowLevel = UIWindowLevelStatusBar+1;
_window.backgroundColor = [UIColor clearColor];
_window.rootViewController = rvc;
[_window makeKeyAndVisible];
[UIApplication sharedApplication].statusBarHidden = YES;
[rvc presentModalViewController: self animated: YES];
[UIApplication sharedApplication].statusBarHidden = NO;
}
#end
Derive your modal view controller, like this:
#interface MyModalViewController : TSFullScreenModalViewController
{
}
- (IBAction) onDismiss:(id)sender;
#end
Use it from another view controller, like this:
- (IBAction) onShowModal:(id)sender
{
MyModalViewController* mmvc = [[MyModalViewController new] autorelease];
[mmvc presentFullScreenModal];
}
Finally, dismiss your view controller as you normally would:
- (IBAction) onDismiss:(id)sender
{
[self dismissModalViewControllerAnimated: YES];
}
Might be a bit of a hack but have you considered:
Take a screenshot programatically of the first view with the status bar (see this SO question)
Create a new view which displays the image you just took in fullscreen (using UIImage's initWithFrame)
Hide the status bar
Present the modal view controller
Then to dismiss the modal view, just reverse the steps.
EDIT:
Won't work for this because you can't take screenshots of the status bar.
It could be as simple as delaying the presentation of your modalViewController using performSelector:withDelay:
Tell the status bar to animate out and then launch the modal controller with the right delay so it coincides with the status bar animation.