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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How to Call Objective-C Code from Swift in Xcode
Learn how to import and call Objective-C classes, methods, and protocols from Swift using an Xcode bridging header or modular framework imports.
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How to Load and Decode a Local JSON File in SwiftUI
Learn how to read and decode a local JSON file in SwiftUI using Codable, handle Bundle vs Documents directory files, and catch…
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How to Add Placeholder Text to UITextView on iOS
Learn how to add placeholder text to a UITextView in Swift using a custom overlay label, delegate callbacks, or a reusable subclass.
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How to Re-Indent and Auto-Format Code in Xcode
Learn how to re-indent code in Xcode using built-in keyboard shortcuts and set up full auto-formatting using SwiftFormat or swift-format.
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Fix: Valid Signing Identity Matching Profile Not Found in Keychain
Fix Xcode’s missing signing identity error when your provisioning profile cannot find its matching certificate or private key in Keychain Access.
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How to Add a Rounded Border to a Button in UIKit
Learn how to add a rounded border to a UIButton in Swift using modern UIButton.Configuration, CALayer properties, dynamic colors, and SwiftUI.
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How to Serialize a Dictionary to JSON in Swift
Convert any Swift dictionary to JSON data or a formatted string using JSONSerialization and JSONEncoder. Handle non-string keys and invalid values.
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Fix: Rounded Corners Not Showing on UIView in Swift
Learn why rounded corners fail to appear on a UIView in Swift and how to fix clipping, layer corner radius, and Interface…
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How to Disable the Network in the iOS Simulator
The iOS Simulator has no network switch — it uses your Mac’s connection. Force offline behaviour with Network Link Conditioner, a dead…
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How to Run Tasks on a Background Thread in Swift Safely
Learn how to run heavy operations on a background thread in Swift using DispatchQueue and modern Swift concurrency without freezing your user…
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.