--- title: Tracking value sources to prevent recursive SwiftUI updates description: When wrapping UITextView or NSTextView in SwiftUI, writing user input back to a binding triggers a redundant update cycle. The common fix — comparing strings... canonical: https://daily.dev/posts/tracking-value-sources-to-prevent-recursive-swiftui-updates-opiijshln twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Tracking value sources to prevent recursive SwiftUI updates | daily.dev og:description: When wrapping UITextView or NSTextView in SwiftUI, writing user input back to a binding triggers a redundant update cycle. The common fix — comparing strings... og:url: https://daily.dev/posts/tracking-value-sources-to-prevent-recursive-swiftui-updates-opiijshln og:image: https://api.daily.dev/og/posts/opIIjSHLN.png og:image:alt: Tracking value sources to prevent recursive SwiftUI updates og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Tracking value sources to prevent recursive SwiftUI updates **[Nil Coalescing](https://daily.dev/sources/nilcoalescing)** · 3 min read · 0 upvotes · 0 comments ## Summary When wrapping UITextView or NSTextView in SwiftUI, writing user input back to a binding triggers a redundant update cycle. The common fix — comparing strings before applying updates — is expensive for large text. A better approach uses SwiftUI's transaction system to tag updates with an ObjectIdentifier of the originating text view. In updateUIView/updateNSView, the wrapper checks the transaction's custom value and skips the update if it originated from that same view. The custom transaction value is declared via the @Entry macro in a Transaction extension. This pattern generalizes to any UIView/NSView with gesture-driven state that feeds back into SwiftUI. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [SwiftUI data dependencies and their effect on view updates](https://daily.dev/posts/swiftui-data-dependencies-and-their-effect-on-view-updates-2kp42i6if) · Nil Coalescing · 1 upvotes · 0 comments - [Two Files. One Difference. 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