iphone - lifetime of [NSMutableDictionary dictionaryWithCapacity:n] -

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i thought object returned nsmutabledictionary dictionarywithcapacity: released when autorelease pool in main.m drained. instead, when assign instance member in -init, find object lasts long -init call.

what managing release of object returned nsmutabledictionary dictionarywithcapacity:?

to further mystify going on here, find when assign object of custom class created convenience constructor instance member in init, instance still "alive" in (for example) touchbegan: ...

generally speaking, apis 1 return autoreleased instances.

that mean when autorelease pool drains, object destructed. if don't manage autorelease pool yourself, should destructed when next return message queue (assuming you're on ui thread).

internally, os pushes , pops autorelease pool around each event calls code. so, if have -touchbegan, there new pool pushed before -touchbegan gets called, , popped -touchbegan returns.

if that's not want, you'll have retain yourself.


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