unable to type-check this expression in reasonable time 🍎 iOS

Swift: The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

A long expression (often in a SwiftUI body) has too many possible type combinations for the compiler — or hides a type error.

Seen on: iOS

Meaning

Long arithmetic/string chains with literals and SwiftUI views with errors deep inside trigger it. Splitting into smaller expressions or subviews makes the real error appear.

Common causes

  • Long chains of + with mixed literals/types
  • Large SwiftUI body with a hidden type error
  • Heavy generic/closure inference

⚡ Quick fix

  1. Break the expression into typed intermediate variables
  2. Extract subviews from big SwiftUI bodies
  3. Add explicit type annotations

Detailed fix by platform

Swift

  1. swift
    let subtotal: Double = items.reduce(0) { $0 + $1.price }
let total: Double = subtotal + shipping - discount

How to diagnose

  1. Expression — Which line?
  2. SwiftUI — Comment out parts to find the error

🔧 Still not fixed?

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