I’m trying to create a Swift-based UI programmatically that resembles the format proven under
Beneath is my view hierarchy which I created utilizing xib. Now I am trying to attain the identical via programatically.
Beneath is the code which i am trying. Right here JTACDayCell is the kid of UICollectionViewCell
FYI: JTACDayCell belongs to JTAppleCalendar library
class DateTableCell: JTACDayCell {
static let reuseID = "dateCell"
lazy var parentView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
lazy var selectedView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
lazy var dateLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
lazy var eventView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
lazy var separatorView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .lightGray
return view
}()
override init(body: CGRect) {
tremendous.init(body: body)
setUpAutoLayout()
parentView.addSubview(selectedView)
parentView.addSubview(dateLabel)
parentView.addSubview(eventView)
addSubview(parentView)
addSubview(separatorView)
}
required init?(coder: NSCoder) {
fatalError("init?(coder: NSCoder) has not been carried out")
}
non-public func setUpAutoLayout() {
NSLayoutConstraint.activate([
parentView.leftAnchor.constraint(equalTo: leftAnchor),
parentView.rightAnchor.constraint(equalTo: rightAnchor),
parentView.topAnchor.constraint(equalTo: topAnchor),
parentView.bottomAnchor.constraint(equalTo: separatorView.topAnchor),
selectedView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor),
selectedView.centerYAnchor.constraint(equalTo: parentView.centerYAnchor, constant: -2.5),
selectedView.widthAnchor.constraint(equalToConstant: 35),
selectedView.heightAnchor.constraint(equalToConstant: 35),
dateLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor),
dateLabel.centerYAnchor.constraint(equalTo: parentView.centerYAnchor, constant: -2.5),
eventView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor),
eventView.widthAnchor.constraint(equalToConstant: 6),
eventView.heightAnchor.constraint(equalToConstant: 6),
eventView.bottomAnchor.constraint(equalTo: parentView.topAnchor, constant: 5),
separatorView.leftAnchor.constraint(equalTo: leftAnchor),
separatorView.rightAnchor.constraint(equalTo: rightAnchor),
separatorView.heightAnchor.constraint(equalToConstant: 0.5),
separatorView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 1)
])
}
}
Upon executing the supplied code, I encounter the next error
*** Terminating app because of uncaught exception ‘NSGenericException’, cause: ‘Unable to activate constraint with anchors <NSLayoutXAxisAnchor:0x6000034619c0 “UIView:0x7fb1a8a20ce0.left”> and <NSLayoutXAxisAnchor:0x600003460800 “AppName.DateTableCell:0x7fb1a8a28470.left”> as a result of they haven’t any frequent ancestor. Does the constraint or its anchors reference gadgets in several view hierarchies? That is unlawful.’
What could be the difficulty right here?
