15.4
What's New
iOS 15.4 introduces passkey cross-device authentication, modernizes HealthKit with async/await support, and significantly expands StoreKit Testing capabilities for subscription and billing scenarios. Key improvements include payment network preferences, EU vaccination record support, and enhanced animation performance on ProMotion displays.
Highlights
- Passkey technology preview enables cross-device sign-in between iPhone, iPad, and Mac
- HealthKit query APIs now support async/await syntax for simplified asynchronous code
- StoreKit Testing expanded with subscription billing retry, grace period, and offer code simulation
- Payment network preference ordering in PKPaymentRequest for multi-SSD card selection
- UIView animations run up to 120 Hz on ProMotion iPhones
- New GroupActivities API for presenting SharePlay session UI within apps
- EU Digital COVID Certificate format support for vaccination records in Wallet and Health
Breaking Changes
- Some std::tuple extensions removed in C++20/C++23 to fix bugs