iphone - Using self dot notation doesn't call dealloc -

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My visual controller class's dellok method is not popped after being pushed with the following code: self.playerViewController = [[Videoplayer view controller alloc] init]; [Self. Player Week Controller Set_Video: Video]; [Self. Navigation controller Push ViewController: self Player. Animated controller: yes]; [Self. Playwear Controller Release];

However, if I change the push code to the following, then my viewlock is populated by the view controller after popping: 

  playerViewController = [[ VideoPlayerViewController Alloc] init]; [Player view controller set_video: video]; [Self. Navigation controller Push ViewController: Animated Player Viewer: Yes]; [Player view controller release];   
 I thought I understood the use of dot notation / self, but not clearly. Can anyone explain the problem here?  
 Here is the property:  
  @property (nonatomic, retain) VideoPlayerViewController * playerViewController;   
 And synthesis is here:  
  @synthesize playerViewController;    
 
 
 You retain it twice.  
  PlayerViewController itself = [[Videoplayer view controller alloc] init]; ^ Keep ^ 1 ^^^^^ retain + 1   
 But you only leave one time.  
 To correct your memory management problem, you can change the code in something like this:  
  self.playerViewController = [[[VideoPlayerViewController alloc] init] autorelease ];   
 
 And many people say  [self.foo release]  is bad style you can call it  [foo release]  < / P>

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