Why UIButton requires two clicks to change its image
I am new to iOS app development using Swift 4. I used the code below to change the image of button2 by running it in the iOS simulator:
@IBAction func button2(_ sender: Any) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
However, button2 was highlighted when I first click on it without changing its image. Then after the second click, the image has been changed in button2.
My question is why the image was not changed in button2 after the first click?
What can I do to change the image after the first click instead of twice? Is this a bug in the iOS simulator of Xcode or it is normal?
ios swift uibutton
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
|
show 1 more comment
I am new to iOS app development using Swift 4. I used the code below to change the image of button2 by running it in the iOS simulator:
@IBAction func button2(_ sender: Any) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
However, button2 was highlighted when I first click on it without changing its image. Then after the second click, the image has been changed in button2.
My question is why the image was not changed in button2 after the first click?
What can I do to change the image after the first click instead of twice? Is this a bug in the iOS simulator of Xcode or it is normal?
ios swift uibutton
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
i think it's simulator bug.your code is correct(please change sender fromAnytoUIButton)
– andesta.erfan
Nov 17 '18 at 15:04
That may because you have set image to normal state and the button must be in highlighted state. But do check that code on device.
– rptwsthi
Nov 17 '18 at 15:10
@J.Doe i said i think. if you know the correct answer please post it because it's as you say basic
– andesta.erfan
Nov 17 '18 at 16:05
Notice that you call the button "sender" in the method. You need to update sender, not button2. This would be clearer if you updated sender to UIButton (which is what it is) instead of using Any. See my answer below.
– Mozahler
Nov 17 '18 at 16:13
@J.Doe so please ask and try to answer and do not interrupt the community
– andesta.erfan
Nov 17 '18 at 16:36
|
show 1 more comment
I am new to iOS app development using Swift 4. I used the code below to change the image of button2 by running it in the iOS simulator:
@IBAction func button2(_ sender: Any) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
However, button2 was highlighted when I first click on it without changing its image. Then after the second click, the image has been changed in button2.
My question is why the image was not changed in button2 after the first click?
What can I do to change the image after the first click instead of twice? Is this a bug in the iOS simulator of Xcode or it is normal?
ios swift uibutton
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
I am new to iOS app development using Swift 4. I used the code below to change the image of button2 by running it in the iOS simulator:
@IBAction func button2(_ sender: Any) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
However, button2 was highlighted when I first click on it without changing its image. Then after the second click, the image has been changed in button2.
My question is why the image was not changed in button2 after the first click?
What can I do to change the image after the first click instead of twice? Is this a bug in the iOS simulator of Xcode or it is normal?
ios swift uibutton
ios swift uibutton
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
edited Nov 17 '18 at 16:25
rmaddy
240k27313377
240k27313377
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
asked Nov 17 '18 at 14:29
Hosy HosyHosy Hosy
44
44
i think it's simulator bug.your code is correct(please change sender fromAnytoUIButton)
– andesta.erfan
Nov 17 '18 at 15:04
That may because you have set image to normal state and the button must be in highlighted state. But do check that code on device.
– rptwsthi
Nov 17 '18 at 15:10
@J.Doe i said i think. if you know the correct answer please post it because it's as you say basic
– andesta.erfan
Nov 17 '18 at 16:05
Notice that you call the button "sender" in the method. You need to update sender, not button2. This would be clearer if you updated sender to UIButton (which is what it is) instead of using Any. See my answer below.
– Mozahler
Nov 17 '18 at 16:13
@J.Doe so please ask and try to answer and do not interrupt the community
– andesta.erfan
Nov 17 '18 at 16:36
|
show 1 more comment
i think it's simulator bug.your code is correct(please change sender fromAnytoUIButton)
– andesta.erfan
Nov 17 '18 at 15:04
That may because you have set image to normal state and the button must be in highlighted state. But do check that code on device.
– rptwsthi
Nov 17 '18 at 15:10
@J.Doe i said i think. if you know the correct answer please post it because it's as you say basic
– andesta.erfan
Nov 17 '18 at 16:05
Notice that you call the button "sender" in the method. You need to update sender, not button2. This would be clearer if you updated sender to UIButton (which is what it is) instead of using Any. See my answer below.
– Mozahler
Nov 17 '18 at 16:13
@J.Doe so please ask and try to answer and do not interrupt the community
– andesta.erfan
Nov 17 '18 at 16:36
i think it's simulator bug.your code is correct(please change sender from
Any to UIButton)– andesta.erfan
Nov 17 '18 at 15:04
i think it's simulator bug.your code is correct(please change sender from
Any to UIButton)– andesta.erfan
Nov 17 '18 at 15:04
That may because you have set image to normal state and the button must be in highlighted state. But do check that code on device.
– rptwsthi
Nov 17 '18 at 15:10
That may because you have set image to normal state and the button must be in highlighted state. But do check that code on device.
– rptwsthi
Nov 17 '18 at 15:10
@J.Doe i said i think. if you know the correct answer please post it because it's as you say basic
– andesta.erfan
Nov 17 '18 at 16:05
@J.Doe i said i think. if you know the correct answer please post it because it's as you say basic
– andesta.erfan
Nov 17 '18 at 16:05
Notice that you call the button "sender" in the method. You need to update sender, not button2. This would be clearer if you updated sender to UIButton (which is what it is) instead of using Any. See my answer below.
– Mozahler
Nov 17 '18 at 16:13
Notice that you call the button "sender" in the method. You need to update sender, not button2. This would be clearer if you updated sender to UIButton (which is what it is) instead of using Any. See my answer below.
– Mozahler
Nov 17 '18 at 16:13
@J.Doe so please ask and try to answer and do not interrupt the community
– andesta.erfan
Nov 17 '18 at 16:36
@J.Doe so please ask and try to answer and do not interrupt the community
– andesta.erfan
Nov 17 '18 at 16:36
|
show 1 more comment
3 Answers
3
active
oldest
votes
You probably have an issue related to UIButton states that is causing this problem.
I don't think it is a simulator bug.
By the way, a good practice you should follow is to name the outlet different than the @IBAction. Let's say:
@IBAction func buttonTapped(_ sender: Any) {
button.setImage(UIImage(named: "image"), for: .normal)
}
Try this:
override func viewDidLoad() {
super.viewDidLoad()
button.setImage(UIImage(named: "image"), for: .selected)
}
@IBAction func buttonTapped(_ sender: Any) {
button.isSelected = !button.isSelected
}
And then the image will be updated automatically when you tap on the button. You can change it to button.isSelected = true if you want to keep the image after the first tap.
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
add a comment |
Rename your method/action so it differs from the button/property.
Change Any to UIButton since you know its class.
@IBAction func buttonTapped(_ buttonTapped: UIButton) {
buttonTapped. button.isSelected = !button.isSelected
}
Make sure that you are receiving the button callbacks by declaring your view controller a UIButtonDelegate and set the button's delegate property to self.
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Did you declare your view controller a UIButtonDelegate and set the button's delegate property toself?
– Mozahler
Nov 17 '18 at 22:56
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
add a comment |
it's simulator bug. it worked on a real device
@IBAction func button2(_ sender: UIButton) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
You probably have an issue related to UIButton states that is causing this problem.
I don't think it is a simulator bug.
By the way, a good practice you should follow is to name the outlet different than the @IBAction. Let's say:
@IBAction func buttonTapped(_ sender: Any) {
button.setImage(UIImage(named: "image"), for: .normal)
}
Try this:
override func viewDidLoad() {
super.viewDidLoad()
button.setImage(UIImage(named: "image"), for: .selected)
}
@IBAction func buttonTapped(_ sender: Any) {
button.isSelected = !button.isSelected
}
And then the image will be updated automatically when you tap on the button. You can change it to button.isSelected = true if you want to keep the image after the first tap.
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
add a comment |
You probably have an issue related to UIButton states that is causing this problem.
I don't think it is a simulator bug.
By the way, a good practice you should follow is to name the outlet different than the @IBAction. Let's say:
@IBAction func buttonTapped(_ sender: Any) {
button.setImage(UIImage(named: "image"), for: .normal)
}
Try this:
override func viewDidLoad() {
super.viewDidLoad()
button.setImage(UIImage(named: "image"), for: .selected)
}
@IBAction func buttonTapped(_ sender: Any) {
button.isSelected = !button.isSelected
}
And then the image will be updated automatically when you tap on the button. You can change it to button.isSelected = true if you want to keep the image after the first tap.
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
add a comment |
You probably have an issue related to UIButton states that is causing this problem.
I don't think it is a simulator bug.
By the way, a good practice you should follow is to name the outlet different than the @IBAction. Let's say:
@IBAction func buttonTapped(_ sender: Any) {
button.setImage(UIImage(named: "image"), for: .normal)
}
Try this:
override func viewDidLoad() {
super.viewDidLoad()
button.setImage(UIImage(named: "image"), for: .selected)
}
@IBAction func buttonTapped(_ sender: Any) {
button.isSelected = !button.isSelected
}
And then the image will be updated automatically when you tap on the button. You can change it to button.isSelected = true if you want to keep the image after the first tap.
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
You probably have an issue related to UIButton states that is causing this problem.
I don't think it is a simulator bug.
By the way, a good practice you should follow is to name the outlet different than the @IBAction. Let's say:
@IBAction func buttonTapped(_ sender: Any) {
button.setImage(UIImage(named: "image"), for: .normal)
}
Try this:
override func viewDidLoad() {
super.viewDidLoad()
button.setImage(UIImage(named: "image"), for: .selected)
}
@IBAction func buttonTapped(_ sender: Any) {
button.isSelected = !button.isSelected
}
And then the image will be updated automatically when you tap on the button. You can change it to button.isSelected = true if you want to keep the image after the first tap.
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
edited Nov 17 '18 at 15:54
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
answered Nov 17 '18 at 15:20
Matias JurfestMatias Jurfest
386412
386412
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
add a comment |
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
@HosyHosy it worked for you or you still need help?
– Matias Jurfest
Nov 18 '18 at 10:13
add a comment |
Rename your method/action so it differs from the button/property.
Change Any to UIButton since you know its class.
@IBAction func buttonTapped(_ buttonTapped: UIButton) {
buttonTapped. button.isSelected = !button.isSelected
}
Make sure that you are receiving the button callbacks by declaring your view controller a UIButtonDelegate and set the button's delegate property to self.
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Did you declare your view controller a UIButtonDelegate and set the button's delegate property toself?
– Mozahler
Nov 17 '18 at 22:56
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
add a comment |
Rename your method/action so it differs from the button/property.
Change Any to UIButton since you know its class.
@IBAction func buttonTapped(_ buttonTapped: UIButton) {
buttonTapped. button.isSelected = !button.isSelected
}
Make sure that you are receiving the button callbacks by declaring your view controller a UIButtonDelegate and set the button's delegate property to self.
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Did you declare your view controller a UIButtonDelegate and set the button's delegate property toself?
– Mozahler
Nov 17 '18 at 22:56
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
add a comment |
Rename your method/action so it differs from the button/property.
Change Any to UIButton since you know its class.
@IBAction func buttonTapped(_ buttonTapped: UIButton) {
buttonTapped. button.isSelected = !button.isSelected
}
Make sure that you are receiving the button callbacks by declaring your view controller a UIButtonDelegate and set the button's delegate property to self.
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
Rename your method/action so it differs from the button/property.
Change Any to UIButton since you know its class.
@IBAction func buttonTapped(_ buttonTapped: UIButton) {
buttonTapped. button.isSelected = !button.isSelected
}
Make sure that you are receiving the button callbacks by declaring your view controller a UIButtonDelegate and set the button's delegate property to self.
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
edited Nov 17 '18 at 23:02
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
answered Nov 17 '18 at 16:08
MozahlerMozahler
2,09151625
2,09151625
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Did you declare your view controller a UIButtonDelegate and set the button's delegate property toself?
– Mozahler
Nov 17 '18 at 22:56
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
add a comment |
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Did you declare your view controller a UIButtonDelegate and set the button's delegate property toself?
– Mozahler
Nov 17 '18 at 22:56
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Thank Mozahler but it didn't work
– Hosy Hosy
Nov 17 '18 at 20:45
Did you declare your view controller a UIButtonDelegate and set the button's delegate property to
self?– Mozahler
Nov 17 '18 at 22:56
Did you declare your view controller a UIButtonDelegate and set the button's delegate property to
self?– Mozahler
Nov 17 '18 at 22:56
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
Excellent. Glad you figured it out!
– Mozahler
Nov 18 '18 at 13:35
add a comment |
it's simulator bug. it worked on a real device
@IBAction func button2(_ sender: UIButton) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
add a comment |
it's simulator bug. it worked on a real device
@IBAction func button2(_ sender: UIButton) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
add a comment |
it's simulator bug. it worked on a real device
@IBAction func button2(_ sender: UIButton) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
it's simulator bug. it worked on a real device
@IBAction func button2(_ sender: UIButton) {
button2.setImage(UIImage(named: "wrong_answer"), for: .normal)
}
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
answered Nov 24 '18 at 11:41
Hosy HosyHosy Hosy
44
44
add a comment |
add a comment |
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i think it's simulator bug.your code is correct(please change sender from
AnytoUIButton)– andesta.erfan
Nov 17 '18 at 15:04
That may because you have set image to normal state and the button must be in highlighted state. But do check that code on device.
– rptwsthi
Nov 17 '18 at 15:10
@J.Doe i said i think. if you know the correct answer please post it because it's as you say basic
– andesta.erfan
Nov 17 '18 at 16:05
Notice that you call the button "sender" in the method. You need to update sender, not button2. This would be clearer if you updated sender to UIButton (which is what it is) instead of using Any. See my answer below.
– Mozahler
Nov 17 '18 at 16:13
@J.Doe so please ask and try to answer and do not interrupt the community
– andesta.erfan
Nov 17 '18 at 16:36