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    ÔÚiphoneÖÐobject c  ÖеÄÄÚ´æ¹ÜÀíÊÇͨ¹ý¼ÆÊýÆ÷À´¹ÜÀíµÄ,ÿ¸ö¶ÔÏóÄÚ²¿¶¼ÓÐÒ»¸ö¼ÆÊýÆ÷.н¨Ò»¸ö¶ÔÏó,»òÕßÕâ¸ö¶ÔÏ󱻯äËû¶ÔÏóÒýÓÃ,¶à»áʹ¼ÆÊýÆ÷¼Ó1.Retain Ôö¼Ó¼ÆÊýÆ÷Öµ release ¼õÉÙ¼ÆÊýÆ÷Öµ.µ±¼ÆÊýÆ÷Ϊ0ʱ¶ÔÏó¾Ídealloc×Ô¼º.
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You own any object you create by allocating memory for it or copying it.
Related methods: alloc, allocWithZone:, copy, copyWithZone:, mutableCopy, mutableCopyWithZone:
If you are not the creator of an object, but want to ensure it stays in memory for you to use, you can express an ownership interest in it.
Related method: retain
If you own an object, either by creating it or expressing an ownership interest, you are responsible for releasing it when you no longer need it.
Related methods: release, autorelease
Conversely, if you are not the creator of an object and have not expressed an ownership interest, you must not release it.
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    Thingamajig *thingamajig = [[Thingamajig alloc] init];
    NSArray *sprockets = [thingamajig sprockets];
    [thingamajig release];
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retainËü£¬£¨µÚ¶þÌõ¹æÔò£© ËùÒÔÎÒÃDz»¸ºÔðreleaseËü¡£
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    (NSArray *)sprockets { 
       NSArray *array;
       array = [[NSArray alloc] initWithObjects:mainSprocket,auxiliarySprocket, nil];
       return [array autorelease];
}
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}
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