ARC指南2
要想将非ARC的代码转换为ARC的代码，大概有2种方式： 1.使用Xcode的自动转换工具 2.手动设置某些文件支持AR C 一、Xcode的自动转换工具 Xcode带了一个自动转换工具,可以将旧的源代码转成ARC模式 1.ARC是LLVM 3.0编译器的特性,而现有工程可能使用老的GCC 4.2
要想将非ARC的代码转换为ARC的代码，大概有2种方式：
1.使用Xcode的自动转换工具
2.手动设置某些文件支持ARC
一、Xcode的自动转换工具
Xcode带了一个自动转换工具,可以将旧的源代码转成ARC模式
1.ARC是LLVM 3.0编译器的特性,而现有工程可能使用老的GCC 4.2或LLVM-GCC编译器,因此首先需要设置使用LLVM 3.0编译器:
(现使用的XCode4.5，LLVM 3.0已经升级到LLVM 4.1)
最好也选上Warnings中的Other Warning Flags 为 -Wall,这样编译器就会检查所有可能的警告,有助于我们避免潜在的问题
2.Build Options下面的Run Static Analyzer选项也最好启用,这样每次Xcode编译项目时,都会运行静态代码分析工具来检查我们的代码
3.设置"Objective-C Automatic Reference Counting"选项为YES,不过Xcode自动转换工具会自动设置这个选项,这里只是说明一下如何手动设置
4.打开Xcode的自动转换工具
5.Xcode会显示一个新窗口,让你选择哪些文件需要转换
点击Check按钮,Xcode可能会弹出对话框提示项目不能转换为ARC,需要你准备好转换(这里暂时省略详细说明)
6.如果没有什么警告、错误了，就会弹出一下提示窗口：
7.点击Next,几秒钟后,Xcode会提示所有文件的转换预览,显示源文件的所有改变。左边是修改后的文件,右边是原始文件。在这里你可以一个文件一个文件地查看Xcode的修改,以确保Xcode没有改错你的源文件:
点击Save即可完成转换
8.自动转换之后,Xcode会移除所有retain、release、autorelease调用,这可能会导致代码出现其它警告、无效语法等,这些都需要自己手工进行修改
注意:Xcode的自动转换工具最好只使用一次,多次使用可能会出现比较诡异的问题。假如你第一次转换没有转换所有的文件,当你稍后试图再次转换剩余的文件时,Xcode实际上不会执行任何转换操作。因此最好一次就完成转换,没有转换的文件可以考虑手工进行修改
二、手动开启某些文件的ARC
在Compiler Flags一列加上-fobjc-arc就表示开启这个.m文件的ARC
三、禁止某些文件的ARC
在Compiler Flags一列加上-fno-objc-arc就表示禁止这个.m文件的ARC
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