UIView with programmatic layout

[mhillebrand]

I'd like to use Injection with my UIView subclasses that contain programmatic layout. That is, I've created Auto Layout constraints using Swift code within UIViews...not within UIViewControllers. Injection doesn't seem to help in this scenario, or is there something I'm missing?

Thanks!

[mhillebrand]

I created a workaround, but I'm not sure I like it very much. It requires each UIView subclass to override the addConstraints() method, and what I've done with subview constraints feels awkward:

@objc extension UIView {
    #if DEBUG
    @objc func injected() {
        removeSubviewConstraints()
        addConstraints()
    }
    #endif

    func addConstraints() {}

    func removeSubviewConstraints() {
        subviews.forEach { $0.removeAllConstraints() }
    }

    func removeAllConstraints() {
        var superview = self.superview

        while superview != nil {
            for constraint in superview!.constraints {
                if constraint.firstItem as? UIView == self || constraint.secondItem as? UIView == self {
                    constraint.isActive = false
                }
            }

            superview = superview?.superview
        }

        constraints.forEach { $0.isActive = false }
    }
}

[mhillebrand]

Bah. This is no good. I still can't see programmatic updates to UIViews that are NOT related to layout constraints. I guess I could just stop using anonymous closures to configure my subview properties and do all of that within a method that gets called both on init and on injection...

[Polisas]

Did you fix it ? Or got a workaround ?

[mhillebrand1]

Yeah, I mentioned my workaround above:

I guess I could just stop using anonymous closures to configure my subview properties and do all of that within a method that gets called both on init and on injection.

Here's an example:

import TinyConstraints

class InjectableView: UIView {
    private let subview1 = UIView()
    private let subview2 = UIView()

    init() {
        super.init(frame: CGRect.zero)
        configure()
        addSubviews()
        addConstraints()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func configure() {
        subview1.backgroundColor = .green
        subview2.backgroundColor = .yellow
    }

    private func addSubviews() {
        addSubview(subview1)
        addSubview(subview2)
    }

    override func addConstraints() {
        subview1.edgesToSuperview(excluding: .bottom)
        subview1.height(300)

        subview2.edgesToSuperview(excluding: .top)
        subview2.topToBottom(of: subview1)
    }
}

...and then I added a call to configure() in my UIView+Extension.swift file:

    @objc func injected() {
        configure()
        removeSubviewConstraints()
        addConstraints()
    }