Post

Nil Coalescing
@nilcoalescing.com

Learn how to enable SwiftUI's ForEach slow-path diagnostic in Xcode, interpret warnings about variable view counts, and address the reported patterns in List and lazy stacks: nilcoalescing.com/blog/Diagnos... #iOSDev #SwiftUI

nilcoalescing.comDiagnosing ForEach performance issues in SwiftUI lazy containersLearn how to enable SwiftUI's ForEach slow-path diagnostic in Xcode, interpret warnings about variable view counts, and address the reported patterns in List and lazy stacks.

2 reposts10 likes

anhphong
@anhphong.bsky.social

Worth doing right after adding the flag: plant a deliberately variable-count ForEach and confirm it actually warns. A flag set on the wrong target or configuration produces the exact same silent build as code with no slow paths, and nothing in the output tells the two apart.