Issue with Swift programmatic auto-layout constraint

Question

I am simply using

toolBar.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0).isActive = true

for setting up my topAnchor.

However, when I change the constant from 0 to an actual number, the console gives me

[LayoutConstraints] Unable to simultaneously satisfy constraints.

this error. I am calling this constraint in viewDidLoad but changing it to viewWillLayoutSubviews or other parts do not solve the problem.

How do I fix this error? Thank you!

Shehata Gamal · Accepted Answer · 2018-10-20 15:19:39Z

1

Because you create another one , you need to edit the current one

var topCon:NSLayoutConstraint!

topcon = toolBar.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0)

topCon.isActive = true

Then play with constant

topCon.constant = // anyNumber

answered Oct 20, 2018 at 15:19

Shehata Gamal

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5 Comments

Seong Min Choo Over a year ago

this does not fix the problem I still get [LayoutConstraints] Unable to simultaneously satisfy constraints.

Shehata Gamal Over a year ago

please post all context

Seong Min Choo Over a year ago

"<NSAutoresizingMaskLayoutConstraint:0x600002ed0ff0 h=-&- v=--& Material.Toolbar:0x7fa723e09140'\Uc11c\Uc6b8 \Ubc84\Uc2a4 \Uc54c\Ub78c \Uc124\Uc815'.midX == UIView:0x7fa723f0f8d0.midX - 207 (active)>", "<NSAutoresizingMaskLayoutConstraint:0x600002ed1180 h=-&- v=--& Material.Toolbar:0x7fa723e09140'\Uc11c\Uc6b8 \Ubc84\Uc2a4 \Uc54c\Ub78c \Uc124\Uc815'.width == UIView:0x7fa723f0f8d0.width - 414 (active)>", "<NSLayoutConstraint:0x600002ed0730 H:|-(50)-[Material.Toolbar:0x7fa723e09140'\Uc11c\Uc6b8 \Ubc84\Uc2a4 \Uc54c\Ub78c \Uc124\Uc815'] (active, names: '|':UIView:0x7fa723f0f8d0 )>"

Seong Min Choo Over a year ago

Will attempt to recover by breaking constraint <NSLayoutConstraint:0x600002ed0730 H:|-(50)-[Material.Toolbar:0x7fa723e09140'서울 버스 알람 설정'] (active, names: '|':UIView:0x7fa723f0f8d0 )>

Shehata Gamal Over a year ago

the conflict between centerX , width , post the constraints

Seong Min Choo · Accepted Answer · 2018-10-22 04:36:24Z

0

I Simply needed to put translatesAutoresizingMaskIntoConstraints = false

answered Oct 22, 2018 at 4:36

Seong Min Choo

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