内存管理和实例变量?

通常,当我创建一个对象并将其分配给一个实例变量i alloc一个temp对象时,调用ivar setter来保留该对象,然后释放temp对象。然而,今天早上我在查看init时注意到,如果我只是直接分配ivar,则它由alloc保留,同时在调用setter或执行dealoc时也被正确释放。我只是好奇我是否理解正确?

@property(nonatomic, retain) CLLocationManager *locationManager;

.

@synthesize locationManager;

// VERSION 001
- (id)init {
    self = [super init];
    if(self) {
        CLLocationManager *tempManager = [[CLLocationManager alloc] init];
        [self setLocationManager:tempManager];
        [tempManager release];  
    }
    return self;
}

// VERSION 002
- (id)init {
    self = [super init];
    if(self) {
        locationManager = [[CLLocationManager alloc] init]; 
    }
    return self;
}

- (void)dealloc {
    [locationManager release];
    [super dealloc];
}