Is this the right way to use NSAutoreleasePool?

I'm new to Objective-C and I'm not sure if I'm using NSAutoreleasePool the right way.

1. If I want to use autorelease only one time I use:

   
   
   

   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSString *newText = [NSString stringWithFormat:@"%d", prograssAsInt];
    sliderLabel.text = newText;
    [pool release]; //newText will be released
    




2. If I want to use autorelease several times I use:

   
   
   

   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSString *newText = [NSString stringWithFormat:@"%d", prograssAsInt];
    sliderLabel.text = newText;
    [pool drain]; //newText will be released
    newText = [NSString stringWithFormat:@"%d", prograssAsInt];
    sliderLabel.text = newText;
    [pool drain]; //newText will be released
    newText = [NSString stringWithFormat:@"%d", prograssAsInt];
    sliderLabel.text = newText;
    [pool release]; //newText will be released
    

Is this OK? Are there any memory leaks?

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