Cannot pop to previous View Controller in Swift 4
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0
I'm trying to go back to my previous view controller,
I tried multiple ways,
first I tried using
_ = navigationController?.popViewController(animated: true)
which doesn't work and I don't get any error message for that.
then I tried doing :
let viewControllers: [UIViewController] = self.navigationController!.viewControllers as [UIViewController];
self.navigationController!.popToViewController(viewControllers[viewControllers.count - 2], animated: true);
which crashes with the error:
Fatal error: Unexpectedly found nil while unwrapping an Optional value
What am I doing wrong?
And how can I go back to my previous view controller?
swift xcode
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
add a comment |
0
I'm trying to go back to my previous view controller,
I tried multiple ways,
first I tried using
_ = navigationController?.popViewController(animated: true)
which doesn't work and I don't get any error message for that.
then I tried doing :
let viewControllers: [UIViewController] = self.navigationController!.viewControllers as [UIViewController];
self.navigationController!.popToViewController(viewControllers[viewControllers.count - 2], animated: true);
which crashes with the error:
Fatal error: Unexpectedly found nil while unwrapping an Optional value
What am I doing wrong?
And how can I go back to my previous view controller?
swift xcode
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
6
self.navigationControlleris nil? Do you have really aUINavigationController?
– Larme
Nov 15 '18 at 13:14
Your view controller doesn't have a navigation controller.
– Scriptable
Nov 15 '18 at 13:15
It would also be interesting to know how you presented your second view controller. If you usedpresent, going back is different fromnavigationController?.pushViewController.
– Xavier Lowmiller
Nov 15 '18 at 13:23
If you use nav maybe the viewControllers.count - 2 is not valid
– ironRoei
Nov 19 '18 at 11:43
add a comment |
0
0
0
I'm trying to go back to my previous view controller,
I tried multiple ways,
first I tried using
_ = navigationController?.popViewController(animated: true)
which doesn't work and I don't get any error message for that.
then I tried doing :
let viewControllers: [UIViewController] = self.navigationController!.viewControllers as [UIViewController];
self.navigationController!.popToViewController(viewControllers[viewControllers.count - 2], animated: true);
which crashes with the error:
Fatal error: Unexpectedly found nil while unwrapping an Optional value
What am I doing wrong?
And how can I go back to my previous view controller?
swift xcode
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
I'm trying to go back to my previous view controller,
I tried multiple ways,
first I tried using
_ = navigationController?.popViewController(animated: true)
which doesn't work and I don't get any error message for that.
then I tried doing :
let viewControllers: [UIViewController] = self.navigationController!.viewControllers as [UIViewController];
self.navigationController!.popToViewController(viewControllers[viewControllers.count - 2], animated: true);
which crashes with the error:
Fatal error: Unexpectedly found nil while unwrapping an Optional value
What am I doing wrong?
And how can I go back to my previous view controller?
swift xcode
swift xcode
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
edited Nov 15 '18 at 13:39
Xavier Lowmiller
81811314
81811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
57711027
57711027
6
self.navigationControlleris nil? Do you have really aUINavigationController?
– Larme
Nov 15 '18 at 13:14
Your view controller doesn't have a navigation controller.
– Scriptable
Nov 15 '18 at 13:15
It would also be interesting to know how you presented your second view controller. If you usedpresent, going back is different fromnavigationController?.pushViewController.
– Xavier Lowmiller
Nov 15 '18 at 13:23
If you use nav maybe the viewControllers.count - 2 is not valid
– ironRoei
Nov 19 '18 at 11:43
add a comment |
6
self.navigationControlleris nil? Do you have really aUINavigationController?
– Larme
Nov 15 '18 at 13:14
Your view controller doesn't have a navigation controller.
– Scriptable
Nov 15 '18 at 13:15
It would also be interesting to know how you presented your second view controller. If you usedpresent, going back is different fromnavigationController?.pushViewController.
– Xavier Lowmiller
Nov 15 '18 at 13:23
If you use nav maybe the viewControllers.count - 2 is not valid
– ironRoei
Nov 19 '18 at 11:43
6
6
self.navigationController is nil? Do you have really a UINavigationController?– Larme
Nov 15 '18 at 13:14
self.navigationController is nil? Do you have really a UINavigationController?– Larme
Nov 15 '18 at 13:14
Your view controller doesn't have a navigation controller.
– Scriptable
Nov 15 '18 at 13:15
Your view controller doesn't have a navigation controller.
– Scriptable
Nov 15 '18 at 13:15
It would also be interesting to know how you presented your second view controller. If you used
present, going back is different from navigationController?.pushViewController.– Xavier Lowmiller
Nov 15 '18 at 13:23
It would also be interesting to know how you presented your second view controller. If you used
present, going back is different from navigationController?.pushViewController.– Xavier Lowmiller
Nov 15 '18 at 13:23
If you use nav maybe the viewControllers.count - 2 is not valid
– ironRoei
Nov 19 '18 at 11:43
If you use nav maybe the viewControllers.count - 2 is not valid
– ironRoei
Nov 19 '18 at 11:43
add a comment |
0
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6
self.navigationControlleris nil? Do you have really aUINavigationController?– Larme
Nov 15 '18 at 13:14
Your view controller doesn't have a navigation controller.
– Scriptable
Nov 15 '18 at 13:15
It would also be interesting to know how you presented your second view controller. If you used
present, going back is different fromnavigationController?.pushViewController.– Xavier Lowmiller
Nov 15 '18 at 13:23
If you use nav maybe the viewControllers.count - 2 is not valid
– ironRoei
Nov 19 '18 at 11:43