| Field | Xcode 3.1 | Xcode 3.1.1 | Diff |
|---|---|---|---|
| Release type | stable | stable | same |
| Edition | - | - | same |
| Release date | 2008-07-10 | 2008-07-23 | different |
| Minimum macOS | 10.5 | 10.5 | same |
| Swift | unknown | unknown | same |
| iOS SDK | unknown | unknown | same |
| Build | 9M2199 | 9M2517 | different |
建议：如果你是生产环境主力开发，优先选择 stable 版本；如需验证新 SDK，再考虑 beta。