Promises is a modern framework that provides a synchronization construct for Swift and Objective-C.
Last updated Jun 25, 2026
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Promises
Promises is a modern framework that provides a synchronization construct for Objective-C and Swift to facilitate writing asynchronous code.
* The problem with async code * Promises to the rescue * What is a promise? * Features * Benchmark * Add dependency * Import * Adopt * Creating promises * Async * Do * Pending * Resolved * Observing fulfillment * Then * Observing rejection * Catch * All * Always * Any * AwaitPromise * Delay * Race * Recover * Reduce * Retry * Timeout * Validate * Wrap * Default dispatch queue * Ownership and retain cycles * Testing * Objective-C <-> Swift interoperability * Dot-syntax in Objective-C * Broken chain * Nested promises
