Tencent TDS Service

Jan 1, 2015 · Mobile Development

Mastering Objective‑C Message Forwarding to Prevent “Unrecognized Selector” Crashes

This article explains why the “Unrecognized selector sent to instance xxx” crash occurs in Objective‑C, outlines the three stages of the runtime message‑forwarding process, and provides concrete code examples for dynamic method resolution, fast forwarding, and standard forwarding to reliably prevent such crashes in iOS apps.