CODEWITHSUNDEEP
swiftuiviewinitializationswift5
DeveloperSammy
DeveloperSammy

Reputation: 237

required initialiser setup to set a property always

I have this custom view. This view always needs to be instantiated with an Annotation.

class MapImageLocationPin: UIView {
    //MARK: - Properties
    private var annotation: Annotation!
    
    //MARK: - Init
    override init(frame: CGRect) {
        super.init(frame: frame)
        configure()
    }
    
    required convenience init(with annotation: Annotation) {
        self.init(frame: .zero)
        self.annotation = annotation
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    //MARK: - Configure view
    private func configure() {
        print("Pin initialised! \(annotation.title)")
    }
}

The above setup fails (crash, nil value), because configure() is called in self.init, before the annotation is set.

How to solve this ??

Upvotes: 0

Views: 39

Answers (2)

gcharita
gcharita

Reputation: 8347

If you prefer, you can replace your override init(frame: CGRect) and your required convenience init(with annotation: Annotation) with just one initializer:

init(frame: CGRect = .zero, with annotation: Annotation) {
    super.init(frame: frame)
    self.annotation = annotation
    configure()
}

Upvotes: 1

Alexander Nikolaychuk
Alexander Nikolaychuk

Reputation: 664

required convenience init(with annotation: Annotation) {
   self.init(frame: .zero)
   self.annotation = annotation
   self.configure()
}

You can move configure function after self.annotation assignment

Upvotes: 1

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