本文通过一个简单的Objective-C示例程序，演示了对象的retain计数如何随着对象的生命周期而变化。从alloc、init到retain、release的过程，展示了不同操作对对象引用计数的影响。
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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
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