I am trying to have it so a user can choose a photo from their album into an imageview. It seems to work fine if I'm using a push segue to that viewcontroller that has the button to perform the action, but when I change it to modal segue, nothing happens when I click the button to run the function. What is the cause of this exactly?
Method:
- (IBAction)choosePhotoFromAlbum:(id)sender {
UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
imgPicker.delegate = self;
imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self.navigationController presentViewController:imgPicker animated:YES completion:nil];
}
You're trying to present it from the navigation controller, but your view controller is modal. Change
[self.navigationController presentViewController:imgPicker animated:YES completion:nil];
to
[self presentViewController:imgPicker animated:YES completion:nil];.
you're trying to present it from the navigation controller, but your view controller is modal. so just write
[self presentViewController:YourImagePickerController animated:YES completion:nil];.
Related
I'm presenting an instance of CNContactViewController in my app. I want the user to be able to both edit the contact, as well as to dismiss this view controller. Below is the code to present the view controller, which is embedded in a UINavigationController. As you can see in the code, I have allowsEditing = YES, but looking at the screenshot; you can see that I'm not able to edit. Anyone able to help me see what I'm missing? Thanks!
CNContactViewController *contactController = [CNContactViewController viewControllerForUnknownContact:contact];
contactController.allowsEditing = YES;
contactController.delegate = self;
contactController.contactStore = store;
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:contactController];
navController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:navController animated:YES completion:nil];
EDIT: I tried a different method suggested by #WrightCS:
[self presentViewController:contactController animated:YES completion:nil];
And, made sure to add this delegate method:
- (void)contactViewController:(CNContactViewController *)viewController
didCompleteWithContact:(CNContact *)contact{
[self dismissViewControllerAnimated:YES completion:nil];
}
But, repeatedly get this error log:
[CNUI ERROR] Contact view delayed appearance timed out
Instead of creating a UINavigationController instance, try presenting the contact controller directly.
[self presentViewController:contactController animated:YES completion:nil];
CNContactViewControllerDelegate
- (void)contactViewController:(CNContactViewController *)viewController
didCompleteWithContact:(CNContact *)contact;
Present on the main thread
dispatch_async(dispatch_get_main_queue(), ^{
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:contactController];
navController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:navController animated:YES completion:nil];
});
The problem ended up being that I was initializing the CNContactViewController incorrectly...instead of:
CNContactViewController *contactController = [CNContactViewController viewControllerForUnknownContact:contact];
Which would display a contact, but not allow for the option of cancelling out of the contact view or editing it, the correct option (for my scenario) is to use
CNContactViewController *contactController = [CNContactViewController viewControllerForNewContact:contact];
I got an error exc_bad_access,when i use dismissviewcontrolleranimated
the presentViewController code is:
TestViewController *testViewController=[[TestViewController alloc] init];
UINavigationController *nav=[[UINavigationController alloc] initWithRootViewController:testViewController];
[self presentViewController:nav animated:YES completion:^{
NSLog(#"presentViewController is finish");
}];
but,when i remove UINavigationController ,is error is disappear.
like this:
TestViewController *testViewController=[[TestViewController alloc] init];
[self presentViewController:testViewController animated:YES completion:^{
NSLog(#"presentViewController is finish");
}];
Thanks for help.
Present View Controller is presented over a "Root View Controller" not a UINavigationController.
You should present your VC from the Parent VC or Base VC like this
TestViewController *testViewController=[self.storyboard instantiateViewControllerWithIdentifier:#"storyboardIDofViewController"];//set the storyboard ID of the TestViewController in your storyboard by selecting attribute inspector after selecting the view controller.
[self presentViewController:testViewController animated:YES completion:^{
NSLog(#"presentViewController is finish");
}];
This is the correct way to present a VC from another VC.
UINavigationController have Push and Pull transitions and you are trying to apply Modal Transition to it.
In a view that was created modally, pressing a button causes the modal view to be dismissed and another modal view to load.
- (void)loadLanguageSelectionView {
[self dismissViewControllerAnimated:YES completion:nil];
UIViewController *languageSelectionController = [[LanguageSelectionViewController alloc] initWithNibName:nil bundle:nil];
[languageSelectionController setModalPresentationStyle:UIModalPresentationCustom];
[languageSelectionController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentViewController:languageSelectionController animated:YES completion:nil];
}
The following error is thrown when this code block executes:
DenkoStation[4259:73173] Warning: Attempt to present <LanguageSelectionViewController: 0x7b185430> on <ViewController: 0x79f52e50> whose view is not in the window hierarchy!
What surprises me is the fact that the code was running happily before I made some changes to my code as outlined here.
Where's the mistake?
Because you are trying to present a viewController on top of a viewController which is already dismissed and no longer in window hierarchy.
What you can try is, you can take the ParentViewController reference from current viewController and then you can present new viewController on ParentViewController Like This :
- (void)loadLanguageSelectionView {
UIViewController *parentController = self.presentingViewController;
[self dismissViewControllerAnimated:YES completion:^{
UIViewController *languageSelectionController = [[LanguageSelectionViewController alloc] initWithNibName:nil bundle:nil];
[languageSelectionController setModalPresentationStyle:UIModalPresentationCustom];
[languageSelectionController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[parentController presentViewController:languageSelectionController animated:YES completion:nil];
}];
}
I am trying to switch views in my application. I have the following code to take me from the Main View to the first level view:
-(IBAction)levelOneButton
{
levelOneView *testView = [[levelOneView alloc] initWithNibName:nil bundle:nil];
testView.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:testView animated:YES completion:NULL];
}
Which works GREAT! Then the Code to take me to the next level is the exact same but slightly different!
-(IBAction)nextLevelButton
{
LevelTwoView *levelTwo = [[LevelTwoView alloc] init];
levelTwo.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:levelTwo animated:YES completion:nil];
}
Now when I want to go back to the Main menu from here is where the issue occurs. I have the following code which only dismisses the level2 and shows level1 again.
- (IBAction)goBackButton {
[self dismissViewControllerAnimated:YES completion:NULL];
}
Like I said when this code is used it just releases the current view and takes you back to the last view instead of taking you back to the main menu. After realizing it was not working I tried the following code to take me back to the main menu.
- (IBAction)goBackButton {
ViewController *mainMenu = [[ViewController alloc] init];
mainMenu.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:mainMenu animated:YES completion:nil];
}
When this code is run, I get presented with a black screen.
My question remains how may I go back to the view ViewController? Thank you so much!!
Try this when dismissing the second level view controller.
[[self presentingViewController] presentingViewController] dismissModalViewControllerAnimated:YES]
I have been developing an iPhone app and have come across a few issues. I do not have a storyboard in my app and have nothing in my xibs. I have initialised and set everything up through code. When I go to the GameViewController from my main viewcontroller everything is fine, however when I come back through my back button I get this issue:
Presenting view controllers on detached view controllers is discouraged .
When I re-arrive to the main view controller, there are little changes such as the view changing before its supposed to. Here is the code for the button on my
GameViewController *game = [[GameViewController alloc] initWithNibName:nil bundle:Nil];
[self dismissViewControllerAnimated:YES completion:NULL];
[self presentViewController:game animated:YES completion:NULL];
Here is the code for the back button:
ViewController *home = [[ViewController alloc] initWithNibName:nil bundle:nil];
[self dismissViewControllerAnimated:YES completion:NULL];
[self presentViewController:home animated:NO completion:NULL];
If anyone can help me to see what I am doing wrong that would be great.
You can not present home view controller from self because it is already dismissed. You should change
[self dismissViewControllerAnimated:YES completion:NULL];
[self presentViewController:home animated:NO completion:NULL];
to
UIViewController *parentViewController = self.presentingViewController;
[self dismissViewControllerAnimated:YES completion:^
{
[parentViewController presentViewController:home animated:NO completion:nil];
}];