@interfaceAppDelegate()
{
NSObject * obj_;
}
@property(retain) NSObject * obj;// 默认是atomic
//@property(nonatomic, retain) NSObject * obj;
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
obj_ = [[NSObject alloc] init];
id xx = self.obj; // 如果不是nonatomic,这里引用计数+1
xx = self.obj; // 如果不是nonatomic,这里再+1.执行完这句后obj_的引用计数成了3
returnYES;
}
@end