please help to understand the difficult situation.
I realized the Pop Up Window, the way has been described here
Then, in this window, I decided to implement a sample photo from the library, but when you open a new controller may receive the following warning:
Presenting view controllers on detached view controllers is discouraged <PopUpViewController: 0x7fbb405f4e90>.
The sample photo is implemented as follows:
picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = NO;
[picker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
[self presentViewController:picker animated:YES completion:nil];
try this:
[self.view.window.rootViewController presentViewController:picker animated:YES completion:nil];
I think you are presenting your picker in your viewDidAppear method.
If this is so, then that is the reason for the warning...
Please write another method that will present our picker and then perform it with delay.
[self performSelector:#selector(yourMethod)
withObject:nil afterDelay:0.0];
This will let your presentingController load completely before it presents another one.
I hope this helps..
EDIT
The problem is, you are presenting the picker, much before your action sheet is dismissed
EDIT 2
Also instead of actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex, use this method for getting clicked Index -
- actionSheet:didDismissWithButtonIndex:
Perhaps you need to add your popup window as a child controller using addChildController to the controller you show it from so that it is not detached from a view hierarchy?
Also you could try: Another option:
[self.parentViewController presentViewController:picker animated:YES completion:nil];
I noticed this on another thread as a solution. Warning :-Presenting view controllers on detached view controllers is discouraged
In your case, parentViewController may well be nil.
Edit After Seeing Code:
After looking at the code, the problem seems to be as follows:
1) The popup mechanism is using an instance of a UIViewController to create a layout, but you are not actually using the view controller at all. The popup mechanism (showInView:withImage:withMessage:animated:) is extracting the view from the controller and adding it into the view hierarchy of the controller asking for the popup. So using code from this popup controller instance which calls [self presentViewController...] is presenting a modal controller from a controller which is not actually being used. This is where the error is coming from I believe. You need to do all alerts and modal presentations from the original controller OR pass in the controller to use.
2) The original article mentions that because only the container view of the controller is used, you need to keep a strong reference to it when you create it. So you should have:
self.popViewController = [[PopUpViewController alloc] initWithNibName:#"PopUpViewController" bundle:nil];
Solution:
I would extend the showInView... method to pass in the controller which owns the view the popup is being spliced into. Then use this controller to present any modal controllers. So change:
- (void)showInView:(UIView *)aView withImage:(UIImage *)image withMessage:(NSString *)message animated:(BOOL)animated
to
- (void)showInController:(UIViewController *)aController inView:(UIView *)aView withImage:(UIImage *)image withMessage:(NSString *)message animated:(BOOL)animated
Store the controller reference passed in a property in your PopUpViewController class then use this property to call presentViewController...
Related
i have a view controller and i need to dismiss it and present it back in same time.
i had tried dismiss it and call back the view controller but not working.
[self dismissViewControllerAnimated:YES completion:nil];
UIStoryboard *storyboard=[UIStoryboard storyboardWithName:#"Main" bundle:nil];
ExpandViewController *expandView=
[storyboard instantiateViewControllerWithIdentifier:#"ExpandViewController"];
expandView.delegate=self;
[expandView setEventDict:dict];
[self presentViewController:expandView animated:YES completion:NULL];
I am not exactly sure what outcome/functionality you are looking for in your question, but #matt is correct. However, you may be looking to have this happen seamlessly. Therefore you could use child view controllers instead of presenting the view controller using the [self presentViewController:VC animated:animate completion:nil] method.
Adding child vc:
[self addChildViewController:myVC];
[self.view addSubview:myVC.view];
[myVC didMoveToParentViewController:self];
Removing child vc:
[myVC willMoveToParentViewController:nil];
... remove subview.
You can set up a delegate between the two controllers to tell the parent when to dismiss the view to make things easy. You can also add the subviews at different indexes using [self.view insertSubview:myVC atIndex:index] or the other possible functions such as the insert above subview etc, to have one subview be added before dismissing the other to give a more seamless transition.
Hope this helps!
You can't present a view controller until the currently presented view controller has finished being dismissed. You won't know this has happened until the completion handler from your dismissal is called. Your mistake is that the completion handler is nil. Instead, provide a completion handler (in your first line), consisting of the remaining lines of your code. Thus, they will execute after the dismissal finishes.
[self dismissViewControllerAnimated:YES completion:^{
// ... the rest of your code goes in here ...
}];
Hi i have been working on an iOS app.What i am doing is navigating among diffrent view controllers. But the problem is i want finish the current view controller from emoery and then move to the next view controller.
I am using `[self.view removeFromSuperview]; for finishing the cureent view & using
self.loginView = [self.storyboard instantiateViewControllerWithIdentifier:#"LOGIN"];
[self presentViewController:self.loginView animated:NO completion:nil];
for moving to next view controller but the thing is i am not able to remove it from memory.
Please tell me how can i do it?
Thanks in advance.
`
It's better to create a container view controller which manages your view controllers. For example, in viewDidLoad: of container controller you add current controller:
[self addChildViewController:self.currentViewController];
[self.currentViewController didMoveToParentViewController:self];
[self.view addSubView:self.currentViewController.view];
//here set up currentViewController view's frame or constraints if needed
When you need to open login controller, do this:
[self addChildViewController:loginViewController];
[self.loginViewController didMoveToParentViewController:self];
[self.view addSubView:loginViewController.view];
//here set up loginViewController view's frame or constraints if needed
//then remove current view controller
[self.currentViewController willMoveToParentViewController:nil];
[self.currentViewController removeFromParentViewController];
[self.currentViewController.view removeFromSuperview];
Remove from superview will remove it from the current view, but OS won't remove it until he needs to (this is topic for more explanation, let's say it won't remove it asap).
If you want something deleted just call it nil:
self.view = nil;
This will make the pointer to nil, so view won't be there any more. (the view really will be somewhere but you won't have access to it)
I am revising your code
self.loginView = [self.storyboard instantiateViewControllerWithIdentifier:#"LOGIN"];
[self presentViewController:self.loginView animated:NO completion:nil];
What you are doing here is presenting your login viewcontroller.
self: This is the instance of the viewcontroller you are currently working on. So how could you remove self from memory. (Not Possible)
You can approach alternate ways.
For example: 1. Changing root view controller
Pop to root view controller and then Push Login View controller.
If you try to remove not only UIView but the whole UIViewController from a navigation controller stack use this snippet
NSMutableArray *stack = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];
[stack removeObject:yourController];
self.navigationController.viewControllers = stack;
Be aware of using this only when you've already pass to the next controller view.
UPD:
Oh, now I see what you are trying to do. And I can't figure out, why you're trying to step your controllers this way (modally). I think you should use UINavigationController with navigation segues defined directly from your storyboard. Look at this article where apple purely explains what navigation is. That article is about modal views
im have two view controller UserListView and UserProfileView!
in UserListView view controller i'm have a button for swtich to UserProfileView and here is code.
UserListView.m - Click Action
- (IBAction)SettingClick:(id)sender
{
UserList *UserProfile = [self.storyboard instantiateViewControllerWithIdentifier:#"UserProfileView"];
[self presentViewController:UserProfile animated:YES completion:nil];
}
And code working fine, when user switch to profile (UserProfileView) have a close button back to UserListView and here is code.
UserProfileView.m - Close click action
- (IBAction)CloseClick:(id)sender
{
[self dismissViewControllerAnimated:YES completion:nil];
UserProfile *UseList = [self.storyboard instantiateViewControllerWithIdentifier:#"UserListView"];
[self presentViewController:UseList animated:YES completion:nil];
}
in this code i will using [self dismissViewControllerAnimated:YES completion:nil]; to close UserProfileView view controller for low ram usage and it work.
But affter i close UserProfileView i want to open this view controller again and it do not work, UserProfileView not showing again??
i using xcode 5 and building an App for ios 7, please help.
Thanks for your time.
If I understand correctly, when you call SettingClick: your app is displaying a UserList. So, when you dismiss a view controller presented on top of it, you should go back to UserList without the need for presenting it again. So you can try with:
- (IBAction)CloseClick:(id)sender
{
[self dismissViewControllerAnimated:YES completion:nil];
}
This will work unless you had originally presented UserList as well. In this case, UserList will be dismissed with the top controller. In this case, you can delay presenting a second time UserList after dismissing UserProfile, and it should work.
In the latter case, I would suggest you to use a navigation controller instead of simply presenting your controllers like you are doing. As you see, it is not really straightforward and you will get into catches of any kind. Presenting a controller works ok when you present just one controller at a time. On the other hand, if you instantiate a UINavigationController, this will handle the controllers' hierarchy for you.
use this -
- (IBAction)CloseClick:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
This will return to your previous view when u click that button that has been linked with this action
I'm having an app crash in iOS7, but is working on iOS6. While debugging the next code from my AppDelegate, I checked that in iOS7 the next function is executed and then the modal view controller is loaded.
- (void)presentModalWebViewWithURL:(NSURL *)url title:(NSString *)title
{
[self.modalWebViewController dismissModalViewControllerAnimated:YES];
self.modalWebViewController = [[[MyModalWebViewController alloc] initWithURL:url] autorelease];
self.modalWebViewController.title = title;
UINavigationController *nav = [self.modalWebViewController modalNavigationControllerWithTarget:self dismissSelector:#selector(dismissModalWebView)];
[self.window.rootViewController presentViewController:nav animated:YES completion:NULL];
}
In iOS6, I checked that the function stops the execution in the last line until the modal view controller is loaded.
What happens in iOS7 is that when the modal view controller tries to load running viewWillAppear, I was able to check that the modal view controller has changed all the values and even the properties are pointing to objects of different types. I guess that they are being deallocated but I can't figure out why and how to fix it. Any suggestions?
When you dismiss a modal view controller, you're supposed to call the dismiss method on the view controller that presented the view controller. Also the dismissModalViewControllerAnimated: method is deprecated, you should instead use dismissViewControllerAnimated:completion:. So looking at your code, you should probably be calling the dismiss method on self.window.rootViewController, since that's what you're presenting modal views from.
Also, not knowing how the rest of your code looks, I'm assuming the first time this gets called, self.modalWebViewController is nil, so you probably want to check if self.modalWebViewController is set to something before you call dismiss, and also to set it to nil any time you do dismiss it.
As part of my updating my apps to replace the deprecated presentModalViewController with presentViewController, I did some testing.
What I found was disturbing. Whereas presentModalViewController always works and there is no question about it working, I have found the presentViewController method often will not display my VC at all. There is no animation and it never shows up.
My loadView are called without problems, but the actual view does not appear.
So here is what I am doing:
User taps a button in my main view controller.
In the callback for that tap, I create a new view controller and display it as shown above.
The VC never appears (it is an intermittent problem though) but because this VC begins playing some audio, I know that its loadView was called, which looks like as follows.
My button-pressed callback is as follows:
- (void) buttonTapped: (id) sender {
VC *vc = [[VC alloc] init];
[self presentViewController: vc animated:YES completion: nil];
[vc release];
}
Here is my loadview in the VC class:
- (void) loadView {
UIView *v = [UIView new];
self.view = v;
[v release];
... create and addsubview various buttons etc here ...
}
Thanks.
Make sure the controller that calls the function has its view currently displayed (or is a parent to the one currently displayed) and it should work.