可能说的有点歧义,ARC是一个编译期技术,是Apple在Xcode4.2、IOS5发布时提出的概念,Xcode4.1不支持,但支持IOS4和IOS5。所以官方有句话:ARC is supported in Xcode 4.2 for Mac OS X v10.6 and v10.7 (64-bit applications) and for iOS 4 and iOS 5. Weak references are not supported in Mac OS X v10.6 and iOS 4.
可能说的有点歧义,ARC是一个编译期技术,是Apple在Xcode4.2、IOS5发布时提出的概念,Xcode4.1不支持,但支持IOS4和IOS5。所以官方有句话:ARC is supported in Xcode 4.2 for Mac OS X v10.6 and v10.7 (64-bit applications) and for iOS 4 and iOS 5. Weak references are not supported in Mac OS X v10.6 and iOS 4.