Mixing
Prepare doesn't get called on segue (Swift 4.2)
I've searched for an answer here, but wasn't able to find the exact same issue I have, please help me so sort it out.
The problem is that when I create a separate view and try to make a segue using storyboard and navigation view controller, the segue itself works fine, but
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
does not get called. To make my example as minimal as possible I've make a toy app to show what's going on.
That's how the overall storyboard schema looks like. ViewController is embedded in NavigationController.
Segue is made with ctrl + SecondViewController, identifier is set.
Custom class for SecondViewController is set.
View controllers have the following implementation:
Main view controller sets the title of the only button:
class ViewController: UIViewController {
@IBOutlet weak var button: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
button.setTitle("Awesome title", for: .normal)
}
}
On button press the label is meant to be updated from the button's title:
class SecondViewController: UIViewController {
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print("SecondViewController viewDidLoad method")
}
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print(print("SecondViewController prepare method"))
if let text = (sender as? UIButton)?.titleLabel?.text {
label.text = text
}
}
}
I intentionally put two print statements to show that viewDidLoad actually gets called, but not prepare.
Here is a gif showing how the app works. As you may see label on the second view doesn't get updated either.
I've also tried to set segue this way, then create an @IBAction function and manually call performSegue:
@IBAction func onButton(_ sender: UIButton) {
performSegue(withIdentifier: "Id", sender: self)
}
Please help me to understand and solve the problem. Thank you.
navigation segue xcode10 swift4.2
asked Jan 1 at 18:34
snk4trsnk4tr
14
add a comment |
I've searched for an answer here, but wasn't able to find the exact same issue I have, please help me so sort it out.
The problem is that when I create a separate view and try to make a segue using storyboard and navigation view controller, the segue itself works fine, but
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
does not get called. To make my example as minimal as possible I've make a toy app to show what's going on.
That's how the overall storyboard schema looks like. ViewController is embedded in NavigationController.
Segue is made with ctrl + SecondViewController, identifier is set.
Custom class for SecondViewController is set.
View controllers have the following implementation:
Main view controller sets the title of the only button:
class ViewController: UIViewController {
@IBOutlet weak var button: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
button.setTitle("Awesome title", for: .normal)
}
}
On button press the label is meant to be updated from the button's title:
class SecondViewController: UIViewController {
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print("SecondViewController viewDidLoad method")
}
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print(print("SecondViewController prepare method"))
if let text = (sender as? UIButton)?.titleLabel?.text {
label.text = text
}
}
}
I intentionally put two print statements to show that viewDidLoad actually gets called, but not prepare.
Here is a gif showing how the app works. As you may see label on the second view doesn't get updated either.
I've also tried to set segue this way, then create an @IBAction function and manually call performSegue:
@IBAction func onButton(_ sender: UIButton) {
performSegue(withIdentifier: "Id", sender: self)
}
Please help me to understand and solve the problem. Thank you.
navigation segue xcode10 swift4.2
asked Jan 1 at 18:34
snk4trsnk4tr
14
add a comment |
I've searched for an answer here, but wasn't able to find the exact same issue I have, please help me so sort it out.
The problem is that when I create a separate view and try to make a segue using storyboard and navigation view controller, the segue itself works fine, but
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
does not get called. To make my example as minimal as possible I've make a toy app to show what's going on.
That's how the overall storyboard schema looks like. ViewController is embedded in NavigationController.
Segue is made with ctrl + SecondViewController, identifier is set.
Custom class for SecondViewController is set.
View controllers have the following implementation:
Main view controller sets the title of the only button:
class ViewController: UIViewController {
@IBOutlet weak var button: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
button.setTitle("Awesome title", for: .normal)
}
}
On button press the label is meant to be updated from the button's title:
class SecondViewController: UIViewController {
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print("SecondViewController viewDidLoad method")
}
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print(print("SecondViewController prepare method"))
if let text = (sender as? UIButton)?.titleLabel?.text {
label.text = text
}
}
}
I intentionally put two print statements to show that viewDidLoad actually gets called, but not prepare.
Here is a gif showing how the app works. As you may see label on the second view doesn't get updated either.
I've also tried to set segue this way, then create an @IBAction function and manually call performSegue:
@IBAction func onButton(_ sender: UIButton) {
performSegue(withIdentifier: "Id", sender: self)
}
Please help me to understand and solve the problem. Thank you.
navigation segue xcode10 swift4.2
asked Jan 1 at 18:34
snk4trsnk4tr
14
I've searched for an answer here, but wasn't able to find the exact same issue I have, please help me so sort it out.
The problem is that when I create a separate view and try to make a segue using storyboard and navigation view controller, the segue itself works fine, but
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
does not get called. To make my example as minimal as possible I've make a toy app to show what's going on.
That's how the overall storyboard schema looks like. ViewController is embedded in NavigationController.
Segue is made with ctrl + SecondViewController, identifier is set.
Custom class for SecondViewController is set.
View controllers have the following implementation:
Main view controller sets the title of the only button:
class ViewController: UIViewController {
@IBOutlet weak var button: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
button.setTitle("Awesome title", for: .normal)
}
}
On button press the label is meant to be updated from the button's title:
class SecondViewController: UIViewController {
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print("SecondViewController viewDidLoad method")
}
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print(print("SecondViewController prepare method"))
if let text = (sender as? UIButton)?.titleLabel?.text {
label.text = text
}
}
}
I intentionally put two print statements to show that viewDidLoad actually gets called, but not prepare.
Here is a gif showing how the app works. As you may see label on the second view doesn't get updated either.
I've also tried to set segue this way, then create an @IBAction function and manually call performSegue:
@IBAction func onButton(_ sender: UIButton) {
performSegue(withIdentifier: "Id", sender: self)
}
Please help me to understand and solve the problem. Thank you.
navigation segue xcode10 swift4.2
navigation segue xcode10 swift4.2
asked Jan 1 at 18:34
snk4trsnk4tr
14
asked Jan 1 at 18:34
snk4trsnk4tr
14
asked Jan 1 at 18:34
snk4trsnk4tr
14
asked Jan 1 at 18:34
snk4trsnk4tr
14
asked Jan 1 at 18:34
snk4trsnk4tr
14
14
add a comment |
add a comment |
1 Answer
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Ok, I figured out what's wrong. For those who still feel confused by the way segues work in IOS have a look at the diagram below:
Segues in IOS (taken from here)
Note that prepare (for: sender) is located in View A, not in View B. This is critical since it gets triggered before the actual segue is performed. Moreover, if you assign some values to View B parameter (for instance UIIMageView), then the view gets rendered considering these changes.
answered Jan 15 at 18:33
snk4trsnk4tr
14
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Ok, I figured out what's wrong. For those who still feel confused by the way segues work in IOS have a look at the diagram below:
Segues in IOS (taken from here)
Note that prepare (for: sender) is located in View A, not in View B. This is critical since it gets triggered before the actual segue is performed. Moreover, if you assign some values to View B parameter (for instance UIIMageView), then the view gets rendered considering these changes.
answered Jan 15 at 18:33
snk4trsnk4tr
14
add a comment |
Ok, I figured out what's wrong. For those who still feel confused by the way segues work in IOS have a look at the diagram below:
Segues in IOS (taken from here)
Note that prepare (for: sender) is located in View A, not in View B. This is critical since it gets triggered before the actual segue is performed. Moreover, if you assign some values to View B parameter (for instance UIIMageView), then the view gets rendered considering these changes.
answered Jan 15 at 18:33
snk4trsnk4tr
14
add a comment |
Ok, I figured out what's wrong. For those who still feel confused by the way segues work in IOS have a look at the diagram below:
Segues in IOS (taken from here)
Note that prepare (for: sender) is located in View A, not in View B. This is critical since it gets triggered before the actual segue is performed. Moreover, if you assign some values to View B parameter (for instance UIIMageView), then the view gets rendered considering these changes.
answered Jan 15 at 18:33
snk4trsnk4tr
14
Ok, I figured out what's wrong. For those who still feel confused by the way segues work in IOS have a look at the diagram below:
Segues in IOS (taken from here)
Note that prepare (for: sender) is located in View A, not in View B. This is critical since it gets triggered before the actual segue is performed. Moreover, if you assign some values to View B parameter (for instance UIIMageView), then the view gets rendered considering these changes.
answered Jan 15 at 18:33
snk4trsnk4tr
14
answered Jan 15 at 18:33
snk4trsnk4tr
14
answered Jan 15 at 18:33
snk4trsnk4tr
14
answered Jan 15 at 18:33
snk4trsnk4tr
14
14
add a comment |
add a comment |
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