Disable/enable UIBarButtonItem base on UITextView content swift
0
I'm trying to grey out a UIBarButtonItem when the TextView is empty, and enable it when the TextView isn't empty.
class ViewController: UIViewController {
@IBOutlet weak var text: UITextView!
override func viewDidLoad()
super.viewDidLoad()
let newButton = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: nil)
toolbarItems = [newButton]
navigationController?.isToolbarHidden = false
I have heard suggestion about implementing an observer or implementing a TextView delegate method. Can someone please provide a concrete example.
Thank you so much.
swift uitextview uitoolbar
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
add a comment |
0
I'm trying to grey out a UIBarButtonItem when the TextView is empty, and enable it when the TextView isn't empty.
class ViewController: UIViewController {
@IBOutlet weak var text: UITextView!
override func viewDidLoad()
super.viewDidLoad()
let newButton = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: nil)
toolbarItems = [newButton]
navigationController?.isToolbarHidden = false
I have heard suggestion about implementing an observer or implementing a TextView delegate method. Can someone please provide a concrete example.
Thank you so much.
swift uitextview uitoolbar
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
add a comment |
0
0
0
1
I'm trying to grey out a UIBarButtonItem when the TextView is empty, and enable it when the TextView isn't empty.
class ViewController: UIViewController {
@IBOutlet weak var text: UITextView!
override func viewDidLoad()
super.viewDidLoad()
let newButton = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: nil)
toolbarItems = [newButton]
navigationController?.isToolbarHidden = false
I have heard suggestion about implementing an observer or implementing a TextView delegate method. Can someone please provide a concrete example.
Thank you so much.
swift uitextview uitoolbar
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
I'm trying to grey out a UIBarButtonItem when the TextView is empty, and enable it when the TextView isn't empty.
class ViewController: UIViewController {
@IBOutlet weak var text: UITextView!
override func viewDidLoad()
super.viewDidLoad()
let newButton = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: nil)
toolbarItems = [newButton]
navigationController?.isToolbarHidden = false
I have heard suggestion about implementing an observer or implementing a TextView delegate method. Can someone please provide a concrete example.
Thank you so much.
swift uitextview uitoolbar
swift uitextview uitoolbar
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
asked May 4 '17 at 4:10
Yiu Chung WongYiu Chung Wong
4118
4118
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
3
Please try my code.
I used it for my project.
func textChanged(sender: NSNotification)
if emailTextField.hasText && passwordTextField.hasText
loginButton.isEnabled = true
loginButton.backgroundColor = UIColor(r: 139, g: 0, b: 139)
else
loginButton.backgroundColor = UIColor(r: 139, g: 77, b: 139)
loginButton.isEnabled = false
and add this to viewDidload:
NotificationCenter.default.addObserver(self,selector: #selector(textChanged),name:NSNotification.Name.UITextFieldTextDidChange,object: nil)
loginButton.isEnabled = false
edited Nov 13 '18 at 1:39
Pang
6,8991664101
answered May 4 '17 at 4:14
KristoffKristoff
11829
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
1
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
3
Please try my code.
I used it for my project.
func textChanged(sender: NSNotification)
if emailTextField.hasText && passwordTextField.hasText
loginButton.isEnabled = true
loginButton.backgroundColor = UIColor(r: 139, g: 0, b: 139)
else
loginButton.backgroundColor = UIColor(r: 139, g: 77, b: 139)
loginButton.isEnabled = false
and add this to viewDidload:
NotificationCenter.default.addObserver(self,selector: #selector(textChanged),name:NSNotification.Name.UITextFieldTextDidChange,object: nil)
loginButton.isEnabled = false
edited Nov 13 '18 at 1:39
Pang
6,8991664101
answered May 4 '17 at 4:14
KristoffKristoff
11829
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
1
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
add a comment |
3
Please try my code.
I used it for my project.
func textChanged(sender: NSNotification)
if emailTextField.hasText && passwordTextField.hasText
loginButton.isEnabled = true
loginButton.backgroundColor = UIColor(r: 139, g: 0, b: 139)
else
loginButton.backgroundColor = UIColor(r: 139, g: 77, b: 139)
loginButton.isEnabled = false
and add this to viewDidload:
NotificationCenter.default.addObserver(self,selector: #selector(textChanged),name:NSNotification.Name.UITextFieldTextDidChange,object: nil)
loginButton.isEnabled = false
edited Nov 13 '18 at 1:39
Pang
6,8991664101
answered May 4 '17 at 4:14
KristoffKristoff
11829
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
1
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
add a comment |
3
3
3
Please try my code.
I used it for my project.
func textChanged(sender: NSNotification)
if emailTextField.hasText && passwordTextField.hasText
loginButton.isEnabled = true
loginButton.backgroundColor = UIColor(r: 139, g: 0, b: 139)
else
loginButton.backgroundColor = UIColor(r: 139, g: 77, b: 139)
loginButton.isEnabled = false
and add this to viewDidload:
NotificationCenter.default.addObserver(self,selector: #selector(textChanged),name:NSNotification.Name.UITextFieldTextDidChange,object: nil)
loginButton.isEnabled = false
edited Nov 13 '18 at 1:39
Pang
6,8991664101
answered May 4 '17 at 4:14
KristoffKristoff
11829
Please try my code.
I used it for my project.
func textChanged(sender: NSNotification)
if emailTextField.hasText && passwordTextField.hasText
loginButton.isEnabled = true
loginButton.backgroundColor = UIColor(r: 139, g: 0, b: 139)
else
loginButton.backgroundColor = UIColor(r: 139, g: 77, b: 139)
loginButton.isEnabled = false
and add this to viewDidload:
NotificationCenter.default.addObserver(self,selector: #selector(textChanged),name:NSNotification.Name.UITextFieldTextDidChange,object: nil)
loginButton.isEnabled = false
edited Nov 13 '18 at 1:39
Pang
6,8991664101
answered May 4 '17 at 4:14
KristoffKristoff
11829
edited Nov 13 '18 at 1:39
Pang
6,8991664101
edited Nov 13 '18 at 1:39
Pang
6,8991664101
edited Nov 13 '18 at 1:39
Pang
6,8991664101
6,8991664101
answered May 4 '17 at 4:14
KristoffKristoff
11829
answered May 4 '17 at 4:14
KristoffKristoff
11829
answered May 4 '17 at 4:14
KristoffKristoff
11829
11829
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
1
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
add a comment |
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
1
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Thank you the observer method works great. I never really knew how observer works =]
– Yiu Chung Wong
May 4 '17 at 4:49
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
Excellent solution! Well done... But use the viewWillAppear method instead of viewDidLoad. It's more sensitive than the viewDidLoad
– Mannopson
May 4 '17 at 5:48
1
1
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
yes, your're right xD
– Kristoff
May 4 '17 at 6:01
add a comment |
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