SnapKit Updating Constraint causes conflict
I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2
I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.
Here's my code:
private var menuConstraint: Constraint?
override func updateViewConstraints() {
super.updateViewConstraints()
menuVc.view.snp.makeConstraints { (make) in
self.menuConstraint = make.top.equalTo(view.snp.top).constraint
make.right.equalTo(view.snp.right)
make.width.equalTo(100)
make.height.equalTo(100)
}
}
@objc func onMenuTap() {
self.menuConstraint!.update(offset: 100)
}
When onMenuTap is called I get the following error:
[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
)
As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.
I've tried a few variations:
- wrapping the update line in a
snp.updateConstraintsclosure - setting an initial offset when first creating the constraint
- grabbing the underlying
LayoutConstraintand updatingconstantdirectly.
I always get the same error message.
Do I have something configured wrong?
ios swift autolayout uikit snapkit
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
add a comment |
I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2
I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.
Here's my code:
private var menuConstraint: Constraint?
override func updateViewConstraints() {
super.updateViewConstraints()
menuVc.view.snp.makeConstraints { (make) in
self.menuConstraint = make.top.equalTo(view.snp.top).constraint
make.right.equalTo(view.snp.right)
make.width.equalTo(100)
make.height.equalTo(100)
}
}
@objc func onMenuTap() {
self.menuConstraint!.update(offset: 100)
}
When onMenuTap is called I get the following error:
[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
)
As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.
I've tried a few variations:
- wrapping the update line in a
snp.updateConstraintsclosure - setting an initial offset when first creating the constraint
- grabbing the underlying
LayoutConstraintand updatingconstantdirectly.
I always get the same error message.
Do I have something configured wrong?
ios swift autolayout uikit snapkit
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
add a comment |
I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2
I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.
Here's my code:
private var menuConstraint: Constraint?
override func updateViewConstraints() {
super.updateViewConstraints()
menuVc.view.snp.makeConstraints { (make) in
self.menuConstraint = make.top.equalTo(view.snp.top).constraint
make.right.equalTo(view.snp.right)
make.width.equalTo(100)
make.height.equalTo(100)
}
}
@objc func onMenuTap() {
self.menuConstraint!.update(offset: 100)
}
When onMenuTap is called I get the following error:
[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
)
As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.
I've tried a few variations:
- wrapping the update line in a
snp.updateConstraintsclosure - setting an initial offset when first creating the constraint
- grabbing the underlying
LayoutConstraintand updatingconstantdirectly.
I always get the same error message.
Do I have something configured wrong?
ios swift autolayout uikit snapkit
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
I'm building an iOS app against iOS 12 SDK, Swift 4 and SnapKit 4.2
I want to update a constraint when I tap a button but it creates a conflict with the previous version of the constraint.
Here's my code:
private var menuConstraint: Constraint?
override func updateViewConstraints() {
super.updateViewConstraints()
menuVc.view.snp.makeConstraints { (make) in
self.menuConstraint = make.top.equalTo(view.snp.top).constraint
make.right.equalTo(view.snp.right)
make.width.equalTo(100)
make.height.equalTo(100)
}
}
@objc func onMenuTap() {
self.menuConstraint!.update(offset: 100)
}
When onMenuTap is called I get the following error:
[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top>",
"<SnapKit.LayoutConstraint:0xABC@MyViewController.swift#77 UIView:0xDEF.top == UIView:0xGHI.top + 100.0>"
)
As you can see the previous version of the top constraint (without the offset) is conflicting with the new version. It's as if it didn't update the existing constraint but instead just created a new one.
I've tried a few variations:
- wrapping the update line in a
snp.updateConstraintsclosure - setting an initial offset when first creating the constraint
- grabbing the underlying
LayoutConstraintand updatingconstantdirectly.
I always get the same error message.
Do I have something configured wrong?
ios swift autolayout uikit snapkit
ios swift autolayout uikit snapkit
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
asked Nov 25 '18 at 17:50
Adam LangsnerAdam Langsner
61911021
61911021
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
1
That worked! thanks. I was callingupdateViewConstraintsfrom withinviewDidLoadbut I moved all the code directly insideviewDidLoadand it fixed it. Thanks!
– Adam Langsner
Nov 25 '18 at 18:13
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
Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
1
That worked! thanks. I was callingupdateViewConstraintsfrom withinviewDidLoadbut I moved all the code directly insideviewDidLoadand it fixed it. Thanks!
– Adam Langsner
Nov 25 '18 at 18:13
add a comment |
Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
1
That worked! thanks. I was callingupdateViewConstraintsfrom withinviewDidLoadbut I moved all the code directly insideviewDidLoadand it fixed it. Thanks!
– Adam Langsner
Nov 25 '18 at 18:13
add a comment |
Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
Don't put constraints inside updateViewConstraints as it'll recreate constraints as it's called multiple times so set the code inside viewDidLoad
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
answered Nov 25 '18 at 18:09
Sh_KhanSh_Khan
42.1k51327
42.1k51327
1
That worked! thanks. I was callingupdateViewConstraintsfrom withinviewDidLoadbut I moved all the code directly insideviewDidLoadand it fixed it. Thanks!
– Adam Langsner
Nov 25 '18 at 18:13
add a comment |
1
That worked! thanks. I was callingupdateViewConstraintsfrom withinviewDidLoadbut I moved all the code directly insideviewDidLoadand it fixed it. Thanks!
– Adam Langsner
Nov 25 '18 at 18:13
1
1
That worked! thanks. I was calling
updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!– Adam Langsner
Nov 25 '18 at 18:13
That worked! thanks. I was calling
updateViewConstraints from within viewDidLoad but I moved all the code directly inside viewDidLoad and it fixed it. Thanks!– Adam Langsner
Nov 25 '18 at 18:13
add a comment |
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