NSLayoutConstraint style for VFL - ios

Question

"V:|[v(>=height)]-0.0#highPriority-|"
What will be the constraint (NSLayoutConstraint style) for above VFL.
Perhaps its considering view height with greaterThanEqual & bottom constraint with UILayoutPriority.defaultHigh.
Something i used -
let heightConstraint = NSLayoutConstraint(item: self.view!, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.greaterThanOrEqual, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 0)
let bottomConstraint = NSLayoutConstraint(item: self.view!, attribute: NSLayoutAttribute.bottom, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 0)
bottomConstraint.priority = .defaultHigh
NSLayoutConstraint.activate([heightConstraint,bottomConstraint])

Answer 1

Initial Set up for Answer:
let parentView = self.view!
let childView = UIView()
childView.backgroundColor = UIColor.lightGray
childView.translatesAutoresizingMaskIntoConstraints = false
parentView.addSubview(childView)
For given VFL:
"V:|[v(>=height)]-0.0#highPriority-|"
1. VFL Implementation:
let height: CGFloat = 100
let priority: Int = 1000
//VFL (for vertical positioning and height of childView
parentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[v(>=\(height))]-0.0#\(priority)-|",
options: [],
metrics: nil,
views: ["v" : childView]))
2. NSLayoutConstraint Implementation:
The above VFL's NSLayoutConstraint equivalent is:
let height: CGFloat = 100
//VFL Equivalent: "V:|[v]"
let topConstraint = NSLayoutConstraint(item: childView,
attribute: .top,
relatedBy: .equal,
toItem: parentView,
attribute: .top,
multiplier: 1,
constant: 0)
//VFL Equivalent: "[v(>=height)]"
let heightConstraint = NSLayoutConstraint(item: childView,
attribute: .height,
relatedBy: .greaterThanOrEqual,
toItem: nil,
attribute: .notAnAttribute,
multiplier: 1,
constant: height)
//VFL Equivalent: "[v]|" or "[v]-0.0-|"
let bottomConstraint = NSLayoutConstraint(item: childView,
attribute: .bottom,
relatedBy: .equal,
toItem: parentView,
attribute: .bottom,
multiplier: 1,
constant: 0)
//Adding VFL Equivalent: #priority
bottomConstraint.priority = .defaultHigh
childView.addConstraint(heightConstraint)
parentView.addConstraint(topConstraint)
parentView.addConstraint(bottomConstraint)
NOTE: The given VFL in your question only provides the childViews y position and height.
For width, add the constraints accordingly.
VFL Example for width would be:
parentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[v(100)]",
options: [],
metrics: nil,
views: ["v" : childView]))
Ref:
Apple's Autolayout Guide on VFL