Programming Tutorials

  Attempting to run a newly compiled application on a physical iPhone or iPad only to watch Xcode hang indefinitely on "Preparing the device..." is a severe friction point in mobile engineering. When the timeout finally occurs, developers are met with the ambiguous "Failed to prepare device for development" error. This issue has become significantly more prevalent since the release of Xcode 15 and persists through Xcode 16. It disrupts workflows and degrades productivity. Standard troubleshooting steps, such as restarting the IDE or unplugging the USB cable, rarely resolve the underlying state mismatch. To permanently fix the  Failed to prepare device for development Xcode  error, engineers must understand the architectural changes Apple introduced to the device communication stack and address the network routing conflicts causing the disruption. The Root Cause: CoreDevice and Network-Over-USB Prior to Xcode 15, macOS communicated with iOS devices primarily through ...

  If your automated build pipelines recently started failing with an   altool not found   or an unsupported endpoint error, you have encountered Apple's hard deprecation of the legacy notarization service. In Xcode 15 and later, Apple completely removed   altool   from the toolchain. Builds that previously sailed through your pipeline will now crash during the submission phase, effectively halting macOS CI/CD deployment. This failure requires an immediate migration to its modern successor:  xcrun notarytool . This guide provides a comprehensive xcrun notarytool migration path. It covers the architectural differences, the authentication changes, and the exact pipeline code required to restore your macOS app notarization process. The Root Cause: Why Did Apple Deprecate altool? To understand the altool deprecated fix, you must understand the underlying API shift. Historically,  xcrun altool  operated against Apple's legacy XML-based App Store Connect...