IOS Retain,nil,alloc,init

   retain----retainCount -1;

   nil----retainCount =0;

 1 Retain,alloc,init

int main(int argc, char *argv[])

{

    NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init];

    

    SomeClass *object=[[SomeClass alloc] init];

    NSLog(@"1,object retain count is :%d",[object retainCount]);

    

 

   [object retain];

    NSLog(@"2,object retain count is :%d",[object retainCount]);

      object=nil;

    //[object release];

    NSLog(@"3,object retain count is :%d",[object retainCount]);

    

    object=nil;

    NSLog(@"4,object retain count is :%d",[object retainCount]);

    

    [pool release];

    

    return 0;

    

}

2 run result:

2012-07-15 00:49:52.122 RetainCounts[1259:f803] 1,object retain count is :1

2012-07-15 00:49:52.124 RetainCounts[1259:f803] 2,object retain count is :2

2012-07-15 00:49:52.125 RetainCounts[1259:f803] 3,object retain count is :0

2012-07-15 00:49:52.125 RetainCounts[1259:f803] 4,object retain count is :0