Question 292603 in IOS Swift Question posted in
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Ios swift – A SwiftUI View with one initializer for iOS and macOS

I have the following SwiftUI view in my project that supports macOS 13+ and iOS 16+:

struct MyTextField: View {
    
    var placeholder: LocalizedStringKey
    #if os (iOS)
    var keyboardType: UIKeyboardType = .default
    #endif
}

at call site I can’t use a single initializer like this for both operating systems:

MyTextField(placeholder: "some placeholder",
                                   keyboardType: .asciiCapableNumberPad,
                                   hasToolbar: true)

as it gives a syntax error for macOS as it cannot find the keyboardType argument in the init signature, I know that I can check for the os at call site using #if os(iOS) and provide different init for the target os, but it’s cumbersome when I have a huge form of text fields where I should determine the keyboard type for every text field, is there a way to call one init at call site to support the 2 operating systems in this case ?

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2

Answers


  1. 0

    Create your custom enum class with the UIKeyboardTypes.

    enum MyKeyboardType {
    case `default`,
         asciiCapableNumberPad,
         // ...

#if os(iOS)
    // Consider changing this method to be more generic and scalable
    func getUIType() -> UIKeyboardType {
        switch self {
        case .default:
            return .default
        case .asciiCapableNumberPad:
            return .asciiCapableNumberPad
        // ...
        }
    }
#endif
}

    And use it in your initializer:

    struct MyTextField: View {
    
    var placeholder: LocalizedStringKey
    var keyboardType: MyKeyboardType?
    
    init(placeholder: LocalizedStringKey,
         keyboardType: MyKeyboardType = .default) {
        
        self.placeholder = placeholder
#if os(iOS)
        self.keyboardType = keyboardType
#endif
    }
}
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  2. 0

    If MyTextField wraps a normal SwiftUI TextField, then you don’t need to pass keyboardType as a parameter. You can use the existing keyboardType modifier, like this:

    MyTextField(placeholder: “whatever”)
    #if os(iOS)
    .keyboardType(.asciiCapableNumberPad)
    #endif

    The keyboardType modifier applies to all descendants of the MyTextField.

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