当我们打开ARC自动引用计数时，retainCount不可用，那就关闭吧
Person.h
#import <Foundation/Foundation.h> @interface Person : NSObject @end |
Person.m
#import "Person.h" @implementation Person //定义dealloc方法，当对象引用计数为0时，会被调用 - (void)dealloc{ NSLog(@"Person is dealloc!"); [super dealloc]; } @end |
main.m
#import <Foundation/Foundation.h> #import "Person.h" int main(int argc, const char * argv[]) { @autoreleasepool { //alloc 引用计数加1；retainCount方法返回对象引用计数数 Person *person1 = [[Person alloc] init]; //1 NSLog(@"person1:%lu",(unsigned long)[person1 retainCount]); [person1 retain];//2 NSLog(@"person1:%lu",(unsigned long)[person1 retainCount]); [person1 release];//1 NSLog(@"person1:%lu",(unsigned long)[person1 retainCount]); [person1 release];//0,调用dealloc } return 0; } |
结果：
2014-04-27 17:16:48.041 Person[10196:303] person1:1 2014-04-27 17:16:48.043 Person[10196:303] person1:2 2014-04-27 17:16:48.043 Person[10196:303] person1:1 2014-04-27 17:16:48.043 Person[10196:303] Person is dealloc! |