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Designable view from xib, with optimisation
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@IBDesignable | |
class UIViewXib: UIView { | |
override init(frame: CGRect) { | |
super.init(frame: frame) | |
loadViewFromNib() | |
} | |
required init?(coder aDecoder: NSCoder) { | |
super.init(coder: aDecoder) | |
loadViewFromNib() | |
} | |
private func loadViewFromNib() { | |
let bundle = Bundle(for: type(of: self)) | |
let nib = UINib(nibName: String(describing: type(of: self)), bundle: bundle) | |
if let view = nib.instantiate(withOwner: self, options: nil).first as? UIView { | |
let consts = view.constraints | |
view.subviews.forEach { | |
$0.removeFromSuperview() | |
addSubview($0) | |
} | |
consts.forEach { | |
let firstItem = $0.firstItem === view ? self : $0.firstItem | |
let secondItem = $0.secondItem === view ? self : $0.secondItem | |
addConstraint(.init(item: firstItem!, attribute: $0.firstAttribute, relatedBy: $0.relation, toItem: secondItem!, attribute: $0.secondAttribute, multiplier: $0.multiplier, constant: $0.constant)) | |
} | |
} | |
// low priority default height constraint | |
let heightConst = heightAnchor.constraint(equalToConstant: 100) | |
heightConst.priority = .init(1) | |
heightConst.isActive = true | |
} | |
} |
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