[iOS]Objective-C 实用特性索引（Objective-C Feature Availability Index）
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Objective-C 实用特性索引（Objective-C Feature Availability Index）
本文档分别针对 Xcode 版本以及使用的编译器，还有使用的操作系统版本，将 Objective-C 的各种特性串联起来。
This article correlates features of the Objective-C language with the versions of Xcode and compiler you need to use them, and the OS versions you can use them with.
| 特性 Feature |
工具版本 Tools versions |
OS X 部署版本 OS X deployment |
iOS 布署版本 iOS deployment |
|---|---|---|---|
| 自动引用计数 (ARC) Automatic Reference Counting (ARC) |
Xcode 4.2 (LLVM Compiler 3.0) |
Requires modern runtime Deploys back to OS X v10.7 |
Deploys back to iOS 5 |
| 无归零弱引用的自动引用计数(“ARCLite”) Automatic Reference Counting without zeroing weak reference (“ARCLite”) |
Xcode 4.2 (LLVM Compiler 3.0) |
Requires modern runtime Deploys back to OS X v10.6 |
Deploys back to iOS 4 |
| 默认合成 @property的实例变量和访问器方法 Default synthesis of |
Xcode 4.4 (LLVM Compiler 4.0) |
Requires modern runtime |
Deploys back to iOS 4 |
| 实例变量声明于类扩展中 Instance variables in class extensions |
Xcode 4.2 (LLVM Compiler 3.0) |
Requires modern runtime |
All iOS releases |
| 实例变量声明于 @implementation 实现块 Instance variables in |
Xcode 4.2 (LLVM Compiler 3.0) |
Requires modern runtime |
All iOS releases |
| @implementation 实现块中无需前向方法原型声明 No forward method prototypes needed in |
Xcode 4.3 (LLVM Compiler 3.1) |
All releases |
All iOS releases |
| |
Xcode 4.4 (LLVM Compiler 4.0) |
All releases |
All iOS releases |
| |
Xcode 4.4 and OS X 10.8 or later SDK Xcode 4.5 and iOS 6 or later SDK (LLVM Compiler 4.0) |
All releases |
All iOS releases |
| |
Xcode 4.4 and OS X 10.8 or later SDK Xcode 4.5 and iOS 6 or later SDK (LLVM Compiler 4.0) |
Requires modern runtime Deploys back to OS X v10.6 |
Deploys back to iOS 4 |
- “需要现代的运行时” 暗指 64 位系统。
- 部署回
