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通过 NSNotificationCenter 接收到的对象是否应该 retain 呢？
LividPRO
这是一个创建于 5369 天前的主题，其中的信息可能已经有所发展或是发生改变。
SomeObject * foo = [[notification object] retain];
// Do something with foo
// ...
[foo release];
-OR-
SomeObject * foo = [notification object];
// Just do something with foo
// ...
// Do something with foo
// ...
[foo release];
-OR-
SomeObject * foo = [notification object];
// Just do something with foo
// ...
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