Observe objects in SwiftUI Views which may be nil

Matthias Bartelmeß

Last update: Jul 20, 2022

Related tags

Utility macos swift swift-library ios tvos watchos swiftui

Overview

ObservedOptionalObject

Rationale

SwiftUIs @ObservedObject requires that the observed object actually exists. In some cases it's convenient to observe an object which might be nil. In this case, @ObservedOptionalObject can be used.

struct SomeView: View {
    // Instead of
    @ObservedObject var anObject: Model? // Won't work
    
    // use
    @ObservedOptionalObject var anObject: Model?
    
    var body: some View {
        HStack {
            Text("Name")
            if let name = anObject?.name {
                Text(name)
            }
        }
    }
}

Please note, that @ObservedOptionalObject is only useful if your contains content that should be displayed, even when the object is nil. Otherwise the view should be contained within an if let statement: if let obj = obj { SomeView(anObject: obj) }

Installation

This package is available via SwiftPM

dependencies: [
    .package(url: "https://github.com/fourplusone/observed-optional-object.git", 
        .upToNextMinor(from: "0.1.0")
    )
]

License

This project is licensed under the MIT License.

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Comments

iOS 13

There does not appear to be any reason for why the class should be @available only on iOS 14+.

Please consider relaxing the @available rule to what is actually required by the implementation & in-line with 74aa40a398688b90ee7724797861185e5a696aca :–)
wontfix

opened by lhunath 4