Xcode · Swift · iOS · macOS
Fix Xcode errors, Swift bugs & iOS problems, fast.
Step-by-step fixes for build errors, code signing, SwiftUI, App Store Connect and the bugs that come with every new iOS and macOS release.
Browse by topic
For developers
Xcode Errors
Build failures, code signing and provisioning, simulator problems, archive and upload errors.
For developers
Swift & SwiftUI
Swift and SwiftUI explained with working code: concurrency, data flow, navigation, compiler errors.
For developers
App Store & TestFlight
App Store Connect, TestFlight builds, App Review rejections and StoreKit issues.
For iPhone & iPad
iOS Fixes
Battery drain, Wi-Fi, Bluetooth, storage and app problems after iOS updates.
For Mac
macOS Fixes
macOS update problems, Finder, external drives, storage and apps that won’t open.
What’s new
Developer Updates
New Xcode, SDK and OS releases: what changed, known issues and what to update.
Latest guides
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Fix: Cannot find ‘functionName’ in scope in an Xcode Playground
Why an Xcode project playground can’t see your app’s public functions, and how to fix “Cannot find in scope” with Playground Settings,…
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Swift enumerated(): Loop With Index and Element Together
Use enumerated() to loop over a Swift array with both index and element, build arrays of pairs, and avoid the offset-vs-index trap…
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Fix: NSTextBlock Breaks UITextView Autosizing in TextKit 2
NSTextBlock stops UITextView and NSTextView from autosizing under TextKit 2. Drop the block and draw paragraph backgrounds from layout fragments instead.
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Fix: Unable to simultaneously satisfy constraints in UIKit
Fix the UIKit log ‘Unable to simultaneously satisfy constraints’ by turning off the autoresizing mask and giving the view a real width…
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Fix: SwiftUI Picker .navigationLink Expands to Full Width
Stop a SwiftUI .navigationLink Picker from stretching across the row. Reorder fixedSize, padding and an overlay border so the outline wraps the…
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How to Find the Index of an Item in a Swift Array
Find an item’s index in a Swift array with firstIndex(of:), lastIndex, and identity checks for classes. Fix the old find/indexOf errors and…
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Fix: Audio Artifacts When Updating Oscillator Parameters During ADSR Envelope in AudioKit
Stop audio chunks when changing oscillator frequency, amplitude, or timing mid-envelope. Two proven patterns for artifact-free parameter updates in AudioKit.
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How to Build SwiftUI Views from Model Subclasses That Update
Make SwiftUI views generated from model subclasses redraw correctly: protocol models, @ViewBuilder switches, and the @State input mistake that blocks updates.
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Fix: xcodebuild requires Xcode but active developer directory
The xcode-select error means your developer directory points at CommandLineTools. Point it back at Xcode.app and fix npm, node-gyp and brew builds.
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Heavy Calculations in SwiftUI: Keep Them Out of body and Models
Move heavy statistics out of SwiftUI body and Core Data models: use a calculator type, cache results in @State, and keep fetches…
Built from real problems
Every guide starts from an actual error message, release note or issue developers and users are hitting right now.
Fix first, theory second
A quick answer at the top, then the fixes in order of what’s most likely to work, with code you can copy.
Sources you can check
We link Apple’s release notes and the original discussions, and update guides when new versions change the answer.