Difference between some View vs any View

May 25, 2025

let’s dive into some View vs any View in SwiftUI. Understanding the difference is key to mastering SwiftUI's type system and performance characteristics.

some View — Opaque Return Type

Meaning:

The function or property returns a specific, single concrete type that conforms to View, but hides its identity.

Example:

var body: some View {
    VStack {
        Text("Hello")
        Image(systemName: "star")
    }
}

Characteristics:

• Compile-time known: The compiler knows exactly what the type is, even if you don’t.

• Single concrete type: You cannot return different types in different branches.

• Fast and optimized: No type erasure — it's essentially inlined by the compiler.

• Used for View composition in SwiftUI extensively.

Limitation:

var content: some View {
    if condition {
        Text("Hi")
    } else {
        Image(systemName: "star")
    }
}
// Error: return types must be the same (Text ≠ Image)

To fix that, you'd need to wrap them in a common type, which leads us to:

any View — Existential Type with Type Erasure

Meaning:

The function or property can return any type that conforms to View, using type erasure to hide its identity.

Example:

var content: any View {
    if condition {
        Text("Hi")
    } else {
        Image(systemName: "star")
    }
}

Characteristics:

• Run-time type: The actual type is only known at runtime.

• Flexible: Can return different types conforming to View.

• Slower: Because of dynamic dispatch and type erasure.

• Rare in SwiftUI: Generally avoided unless you must return multiple unrelated View types conditionally.

Note:

any View became available with Swift 5.7 and beyond (included in SwiftUI since iOS 16/macOS 13+). Before that, you had to use AnyView.

A Classic Pre-iOS 16 Workaround — AnyView

Before Swift supported any View directly, we did this:

var content: some View {
    if condition {
        AnyView(Text("Hi"))
    } else {
        AnyView(Image(systemName: "star"))
    }
}

This works but has performance costs, and Apple recommends minimizing AnyView usage.

Summary Table

Feature	some View	any View / AnyView
Type Known At	Compile time	Runtime
Performance	Fast (no erasure)	Slower (type erasure)
Return Types	Must be one concrete type	Can be multiple types
Flexibility	Less	More
Common in SwiftUI?	Yes	Only when truly needed

When to Use Which?

• Use some View by default — safer, faster, preferred by SwiftUI.

• Use any View or AnyView only if you must return different view types from one place.

• If you find yourself needing any View, consider if your logic can be refactored to return a common layout structure instead.