objective-c 引用计数

    NSString * pStr = [[[NSString alloc] initWithFormat:@"100"] autorelease];

    NSLog(@"%d",[pStr retainCount]);

    [pStr retain];

    NSLog(@"%d",[pStr retainCount]);

    

    NSString * pOne = [[NSString alloc] initWithFormat:@"100"];

    NSLog(@"%d",[pOne retainCount]);

    [pOne retain];

    NSLog(@"%d",[pOne retainCount]);

    [pStr autorelease];

    NSLog(@"%d",[pOne retainCount]);

    

2013-12-26 21:40:59.518 TestInput[5635:12203] 1

2013-12-26 21:41:07.832 TestInput[5635:12203] 2

2013-12-26 21:41:13.243 TestInput[5635:12203] 1

2013-12-26 21:41:15.127 TestInput[5635:12203] 2

2013-12-26 21:41:16.950 TestInput[5635:12203] 2