I'm trying to push data from one viewController to another. I've connected a viewController to another ViewController's navigationController and then set the identifier to "showItemSegue". I get an error in these two lines:
var detailController = segue.destinationViewController as ShowItemViewController
detailController.currentId = nextId!
Image illustration:
The code:
override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
nextId = itemArray?.objectAtIndex(indexPath.row).objectForKey("objectId") as? NSString
self.performSegueWithIdentifier("showItemSegue", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if (segue.identifier == "showItemSegue") {
var detailController = segue.destinationViewController as ShowItemViewController
detailController.currentId = nextId!
}
}
The destination view controller of the segue is the UINavigationController. You need to ask it for its top view controller to get to the real destination view controller:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showItemSegue" {
let navController = segue.destination as! UINavigationController
let detailController = navController.topViewController as! ShowItemViewController
detailController.currentId = nextId!
}
}
Related
I am trying to grab an object from a tableview and pass it to a detail view, something I know how to do in Objective-C but am learning for first time Swift. However, my code is not getting the row from the index path or object.
Here is my code.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print("segue")
if segue.identifier == "showDetail"{
if let destinationVC = segue.destination as? detailVC {
)
if let indexPath = self.tableView.indexPathForSelectedRow {
print("row%#",indexPath)//Prints as nil
let thisItem = myItems[indexPath.row]//never gets here
destinationVC.item = thisItem
}
}
}
}
Can anyone see why I am not getting the row or the object? Thanks in advance for any suggestions.
Edit:
I got it to work with following:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetail" {
let indexPath: NSIndexPath = self.tableView.indexPathForSelectedRow! as NSIndexPath
let anItem: myItem = myItems[indexPath.row];
let destVC = segue.destination as? detailVC
destVC?.item = anItem
}
}
Implement UITableViewDelegate method,
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let item = myItems[indexPath.row]
self.performSegue(withIdentifier: "showDetail", sender: item)
}
then implement below,
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showdetail" {
let detailController = segue.destination as! detailVC
detailController.item = sender as! Your_Item
}
}
Why don't you use these methods to save the value of the selected row or item? and then perform segue?
tableView(_:didDeselectRowAt:)
tableView(_:didSelectRowAt:)
I'm trying to learn page navigation without using "Navigation Controller".
Created a button and function like;
#IBAction func backPressed(sender: AnyObject) {
self.performSegueWithIdentifier("page2ToMain", sender: self)
}
It works fine.
I need to pass data from page 2 to page 3. So, inside "didSelectRowAtIndexPath" I used "performSegueWithIdentifier" and override "prepareForSegue" function as below;
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.selectedRow = self.dataArray[indexPath.row]
self.performSegueWithIdentifier("page2ToPage3", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let nextViewController = segue.destinationViewController as! ViewController3
nextViewController.data = self.selectedRow
print(self.selectedRow)
}
When I click the table cell it works well, jumps to other view controller and I see data variable.
But when I press back button it fails with;
Could not cast value of type 'test3.ViewControllerMain' (0x1045469f0) to 'test3.ViewController3' (0x1045466e0).
How can I solve the problem?
You can test for this with optional binding:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let nextViewController = segue.destinationViewController as? ViewController3 {
nextViewController.data = self.selectedRow
print(self.selectedRow)
}
}
Or look at the segue identifier and then test for that:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "page2ToPage3" {
let nextViewController = segue.destinationViewController as! ViewController3
nextViewController.data = self.selectedRow
print(self.selectedRow)
}
}
I have two controllers with UINavigationController (UIViewController(root) and UITableViewController). I need to click action at UIViewController and print something when move to UITableViewController
TableViewController.swift
func printString() {
print("hello world")
}
ViewController.swift
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "sendData" {
let navController = segue.destinationViewController as! UINavigationController
let controller = navController.topViewController as! TableViewController
controller.printString()
}
}
And after click I see that
Could not cast value of type 'myProjectName.TableViewController' (0x5a068) to 'UINavigationController' (0x17ffed4).
Why is that happening?
What about just:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "sendData",
let controller = segue.destinationViewController as? TableViewController {
controller.printString()
}
}
}
It looks like the destinationViewController is the TableViewController.
I’ve tried to push segue by using UICollectionView (show image form MasterView to DeatilView) but is not working. Xcode also doesn’t show any error message. What’s wrong with my code. I need some advice.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
if let indexPath = self.collectionView?.indexPathForCell(sender as! UICollectionViewCell) {
let detailVC = segue.destinationViewController as! DetailMenuViewController
detailVC.picFood = self.collection[indexPath.row]
collection is empty array get data form json
[title = self.nameFood.title], it is working in DetailMenuViewController.swift but not image on code above.
You need to add the UICollecitonViewDelegate
func collectionView(collection: UICollectionView, selectedItemIndex: NSIndexPath)
{
self.performSegueWithIdentifier("showDetail", sender: self)
}
After that add
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
if let indexPath = self.collectionView?.indexPathForCell(sender as! UICollectionViewCell) {
let detailVC = segue.destinationViewController as! DetailMenuViewController
detailVC.picFood = self.collection[indexPath.row]
}
}
}
I'm new in Swift. I want to learn that, how to call another View Controller when the user clicks on cell of Table View.
Thanks in advance.
write following code :
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("showItemDetail", sender: tableView)}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "showItemDetail" {
let indexPath:NSIndexPath = self.tableView.indexPathForSelectedRow()!
let detailVC:ItemDetailViewController = segue.destinationViewController as ItemDetailViewController
detailVC.item = items[indexPath.row] as Item
}
}
add a viewController from storyboard and add a segue from tableview cell to viewController with identifier "showItemDetail";
will navigate too detailViewController
In First View Controller
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!)
{
if segue.identifier == "showItemDetail"
{
let indexPath:NSIndexPath = self.tableView.indexPathForSelectedRow()!
let destination = segue.destinationViewController as DetailViewController
destination.name = "llkin Elimov"
}
In second Detail View Controller
public DetailViewController
{
var name = "name" as String //After you created the segue in main.storyboard, in name , you will get your parsed string automatically
}
Hope my code is clear for you :)