问题描述
NSAutoreleasePool的官方解释Important If you use Automatic Reference Counting (ARC), you cannot use autorelease pools directly. Instead, you use @autoreleasepool blocks instead. For example, in place of:
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init;// Code benefitting from a local autorelease pool.[pool release];
you would write:
@autoreleasepool {// Code benefitting from a local autorelease pool.}
@autoreleasepool blocks are more efficient than using an instance of NSAutoreleasePool directly; you can also use them even if you do not use ARC.
xcode4.3引入ARC，release这块就有些变化，当你使用ARC，就必须将NSAutoreleasePool的地方换成 @autoreleasepool
http://marshal.easymorse.com/archives...
问题解答
回答1：两者的作用时间不一样。AutoReleasePool对象的写法作用于运行时，@autoreleasepool作用于编译阶段。如果要启用ARC的话，在编译阶段就需要告诉编译器启用自动引用计数管理，而不能在运行时动态添加。
回答2：现在苹果推荐都使用@autoreleasepool{},无论是否使用ARC
@autoreleasepool blocks are more efficient than using an instance of > NSAutoreleasePool directly; you can also use them even if you do not use ARC http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSAutoreleasePool_Class/Reference/Reference.html
