Cannot pop to previous View Controller in Swift 4
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
80811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
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
80811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
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
80811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
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
80811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
edited Nov 15 '18 at 13:39
Xavier Lowmiller
80811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
edited Nov 15 '18 at 13:39
Xavier Lowmiller
80811314
edited Nov 15 '18 at 13:39
Xavier Lowmiller
80811314
edited Nov 15 '18 at 13:39
Xavier Lowmiller
80811314
80811314
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
asked Nov 15 '18 at 13:13
Chief MadogChief Madog
5691926
5691926
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
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53320302%2fcannot-pop-to-previous-view-controller-in-swift-4%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53320302%2fcannot-pop-to-previous-view-controller-in-swift-4%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
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