I must be doing something wrong here.
I have a UITableView, and have implemented a UISearchController.
I have a Prototype cell linked to the details screen and pass the selected value in the prepareForSegue method.
For the normal view controller, all works OK, a row is selected and the details screen pushed (i.e. slide in from right).
However when there is an active search, using the UISearchController, the details screen is presented modally (i.e. slide up from bottom of screen) without the UINavigationBar (so there is no possibility to go "back")
I am not using didSelectRowAtIndexPath since I have used storyboard to push the details screen
Why is the presenting animation different when the same code in "prepareForSegue" is being correctly called in each case:
// MARK: - Navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier! == "PresentContactDetail") {
// pass person details from selected row
if let selectedRow = self.tableView.indexPathForSelectedRow()?.row {
let selectedPerson = self.visibleResults[selectedRow]
(segue.destinationViewController as ContactDetail).personRecord = selectedPerson
}
}
}
Any suggestions gratefully received.
in ViewDidLoad of UITableViewController set
definesPresentationContext = true
Related
I'm using a splitViewController to display a master view and a detail view.
When I tap on a row, the detail view updates correctly.
Then, when I'm in portrait view, I collapse the splitview detail view, so that that master list items are shown as follows:
And when I tap on a row, I correctly move to the detail view, as shown:
The problem I'm having is that if I rotate the device in the detail view shown above, while I'm in the detail view, the rotation correctly goes back to the splitView, however, now when I select a row, the delegate method does not update the detail view. It only seems to work if I start out in the splitView and stay in that view, or if I start out in the collapsed view and stay in that. If I rotate, then the delegate method does not seem to work.
I found a prior post, which shows how to use the delegate method to update the detail view using objective C code, using the didSelectRow function. I tried to duplicate this code with the following swift code:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let navigationVC = UINavigationController()
var detailVC = TestsDetailAdvertVC()
if let tests = controller.fetchedObjects, tests.count > 0 {
//if there is, keep track of the test which is selected
selectedTest = tests[indexPath.row]
if let isCollapsed = splitViewController?.isCollapsed {
if isCollapsed {
//solves problem of navigating to the detail view in compact view
// on the iPhone (compact) the split view controller is collapsed
// therefore we need to create the navigation controller and detail controller
detailVC = self.storyboard!.instantiateViewController(withIdentifier: "detailVC") as! TestsDetailAdvertVC
navigationVC.setViewControllers([detailVC], animated: false)
self.splitViewController?.showDetailViewController(detailVC, sender: self)
detailVC.testToEdit = selectedTest
} else {
// if the split view controller shows the detail view already there is no need to create the controllers
// so we just pass the correct test using the delegate
// if the test variable is set, then it calls the showDetail function
delegate?.testToEdit = selectedTest
}
}
}
}
I think that somehow when the one or the other method is used to update the detail view it works, but then when it switches back and forth, it stops working. I wonder if anyone has solved this issue using swift code who could point me to an example.
Note: After some additional searching, I realized that there are a few of delegate methods for the splitViewController, including:
func primaryViewControllerForExpandingSplitViewController:
and
func primaryViewControllerForCollapsingSplitViewController:
and
splitViewController:separateSecondaryViewControllerFromPrimaryViewController:
I've been fiddling around with these methods, but so far haven't been able to get them to work, and I haven't found any posts that show examples of how they are used.
Thanks.
I figured out how to make the detail view update properly, using an answer from a prior post at:
In UISplitViewController, can't make showDetailViewController:sender: push onto detail navigationController
my code to solve the problem is updated using swift code:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var detail = UINavigationController()
var testVC = TestsDetailAdvertVC()
if let tests = controller.fetchedObjects, tests.count > 0 {
//if there is, keep track of the test which is selected
selectedTest = tests[indexPath.row]
if let isCollapsed = splitViewController?.isCollapsed {
if isCollapsed {
//in collapsed view, the correct detail view controller is not
//yet substantiated, so we need to substantiate it
testVC = self.storyboard?.instantiateViewController(withIdentifier: "detailVC") as! TestsDetailAdvertVC
detail.setViewControllers([testVC], animated: true)
testVC.testToEdit = selectedTest
} else {
//in expanded view, the correct view controller needs
//to be identified, using the appropriate view controller for
//the splitview controller
let vc = self.splitViewController?.viewControllers[1]
//which is a navigation controller
if vc is UINavigationController {
detail = vc as! UINavigationController
//which we then use to identify the correct detail view
testVC = detail.viewControllers.first as! TestsDetailAdvertVC
testVC.testToEdit = selectedTest
}
}
}
}
self.splitViewController?.showDetailViewController(detail, sender: self)
}
The key solution is that on the collapsed splitviewcontroller, the detail view has to be instantiated form the storyboard. However, on the expanded splitviewcontroller, the detail view has to come from the expanded navigation controller. Then when I rotate the correct detail view controller updates correctly.
Currently working on my first IOS application. I have a purchase button, on success this currently sets a test button on the same view controller to hidden. Code is as follows
Decleration
#IBOutlet weak var Test: UIButton!
hide button on successful purchase
Test.isHidden = true
Now this works on my Test button, which is sat in the PurchaseViewController,class is the MasterViewController.Swift. (Purchase button that initiates this method is also in the same view controller)
PlanViewController also has a button, and class is also linked to MasterViewController.Swift. This has a separate button that i wish to hide on success of the purchase button.
When I utilise the same code as above for the button, it crashes, is their a limitation on manipulating other view controllers while you are not in it? I would have thought this worked given that they both have the Masterviewcontroller.swift as the class
Thanks
Although sometimes possible, it's generally not a good idea to directly manipulate one view controller's view from another view controller, as you are trying to do. Here is how I would do what you are trying to do.
First, set a segue identifier between your two view controllers by clicking on the segue in the storyboard and going to the attributes inspector. I suggest goToMasterViewController
In both MasterViewController.swift and PurchaseViewController.swift declare a variable var buttonHidden = false
In PurchaseViewController.swift add the following code, which will be called just before your segue to MasterViewController is performed:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "goToMasterViewController") {
let destinationController = segue.destination as! MasterViewController
destinationController.buttonHidden = buttonHidden
}
}
When you hide the button in PurchaseViewController, also set buttonHidden = true
And finally in MasterViewController.swift:
override func viewWillAppear(_ animated: Bool) {
testButton.isHidden = buttonHidden
}
Currently developing a small ios app in swift, I have populated a collection view cell with data from a .plist, each cell has a title and button, what i'm wanting is to segue to multiple view controllers in the storyboard depending on the segue identity once the button is pressed. For example if the segue has the id set as food, i want it to navigate to the view called food?
or if it is easier for the segue to pull the title from the cell then navigate to the view with the same title as the cell?
ill try and explain in code:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
if segue.identifier == "food"
{
//then navigate to the view controller called food
}
else if segue.identifier == "drink"{
{
//navigate to the view called drink
}
}
If food, drink or any other items have their own unique view in storyboard this is achievable.
You can assign a string to each button in UICollectionView and check which item in the collection was tapped and do a performSegueWithIdentifier: with button string.
performSegueWithIdentifier("toComments", sender: self)
Then prepareForSegue: method to pass data. Do another if for drink.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "toFood" {
let ExchangeViewData = segue.destinationViewController as! FoodViewController
ExchangeViewData.foodMenuToShow = foodMenuID //This can be anything that you get your food items.
}
}
You can't do what you are asking for. A segue identifier is what determines which view controller gets invoked by the segue. If you want to go to a different view controller, invoke a segue with a different identifier. By the time you get to prepareForSegue it's too late. The segue to a specific view controller is already in progress.
You should explain what it is you're trying to do and we can help you solve your problem rather than trying to fight the APIs and do something that's neither possible nor appropriate. (Your question is an example of an "XY problem".)
This seems to be a common problem, but none of the many solutions I've tried have seemed to work (or I'm not executing them properly).
I've got an image on FirstImageVC, I push a button to bring up a new view collection view controller with some custom images, the user selects one, and I want to send that image back to the FirstImageVC to overlay the original image, sort of like a sticker.
I just can't get it to execute a segue of any kind on selecting an image. Here's what I'm sort of working with in the second view controller. And it seems I may need to be adding something to the original VC, too, no?
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
prepareForSegue("backToFirstSegue", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "backToFirstSegue"{
let vc = (segue.destinationViewController as! FirstImageVC)
vc.Delegate = self //Include this line
vc.chosenGhostPhoto = bgGhostImage?.image
}
}
EDIT 1: Here's what I did to get the unwind to work, though it's not carrying back the image selected from the collection view, which needs to be called chosenGhostPhoto.
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
performSegueWithIdentifier("unwindToFirstSegue", sender: self)
}
This is how you can do this:
Step 1: Add a delegate variable on your second view controller. Please name it delegate and not Delegate - owing to naming convention.
Step 2: Define a protocol and add functions that you want your second view controller delegate to perform. Say func selectedImage(image : UIImage)
Step 3: While pushing second view from first view controller, set your first view controller as delegate of second view controller. Something like this:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "secondSegue"{
let vc = (segue.destinationViewController as! SecondImageVC)
vc.delegate = self
}
}
Step 4: In your second view controller once image is selected call delegate of second view controller. Below function needs to be triggered on tap on the image on second view controller.
fun imageSelected {
self.delegate.selectedImage(bgGhostImage?.image)
}
Step 5: Implement selectedImage in your first view controller and use the passed image.
An unwind segue (sometimes called exit segue) can be used to navigate back through push, modal or popover segues (as if you popped the navigation item from the navigation bar, closed the popover or dismissed the modally presented view controller). On top of that you can actually unwind through not only one but a series of push/modal/popover segues, e.g. "go back" multiple steps in your navigation hierarchy with a single unwind action.
When you perform an unwind segue, you need to specify an action, which is an action method of the view controller you want to unwind.
For your reference this is quit similar question and might help in understanding unwind segue
I promise that I'm completely new to Xcode and Swift, so I know I am making silly mistakes but I don't know where. This is part of my iOS app storyboard:
where the segue between the first table view and the second navigation controller is called myTaskDetailSegue and its type is Show (e.g. Push). Now I have some problems:
Neither in the first table view controller nor in the second the back button is showed and I don't know why. Many people told me that navigation bar and back button are as default in navigation controllers but they did not appear
In the class of the first table view controller here is the method prepareForSegue()
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "myTaskDetailSegue" ) {
let indexPath = self.tableView.indexPathForSelectedRow()
let task = self.taskCollection[indexPath!.row] as Task
let controller = (segue.destinationViewController as! UINavigationController).topViewController as! DetailsMyTasksViewController
controller.detailItem = task
println("segue mostra task \(task.id)")
controller.navigationItem.leftItemsSupplementBackButton = true
}
}
so you can read that the segue identifier is correct but when a row is tapped nothing happens and the second table view controller is not showed.
I don't really know what I am missing because of my inexperience.
Here is the complete storyboard:
You don't need two UINavigationController's to what you want to achieve. Is important to note that every time you push(with a segue or manually) a new UIViewController it's added to the navigation stack.
According to Apple:
Pushing a view controller displays its view in the navigation interface and updates the navigation controls accordingly. You typically push a view controller in response to user actions in the current view controller—for example, in response to the user tapping a row in a table.
So you can remove the second UINavigationController in your Storyboard and make the segue directly to your DetailsMyTaskViewController and update your prepareForSegue like in the following way:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "myTaskDetailSegue" ) {
let indexPath = self.tableView.indexPathForSelectedRow()
let task = self.taskCollection[indexPath!.row] as Task
let controller = segue.destinationViewController as! DetailsMyTasksViewController
controller.detailItem = task
println("segue mostra task \(task.id)")
}
}
And your back button should appear by default as you said before. Nevertheless I strongly recommend you read the following two guides :
UINavigationViewController
View Controller Programming Guide for iOS
For a better understanding of the navigation stack, etc.
I hope this help you.