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...
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The action time of the two is different. The writing method of AutoReleasePool object acts on the runtime, and @autoreleasepool acts on the compilation phase. If you want to enable ARC, you need to tell the compiler to enable automatic reference counting management during the compilation phase, and it cannot be added dynamically at runtime.
Now Apple recommends using @autoreleasepool{}, regardless of whether ARC is used