On 23/06/2009, at 6:39 AM, Daniel Torrey wrote:
I'm looking at some sample iPhone code, and in the app delegate's
applicationDidFinishLaunching method, I see
// Set up the view controller
MyViewController *aViewController = [[MyViewController alloc]
initWithNibName:@"HelloWorld" bundle:[NSBundle mainBundle]];
self.myViewController = aViewController;
[aViewController release];
I'm a little confused - I see an allocation, followed by an
assignment, followed by a release. I think that the assignment is
really a call to a setter - the myViewController field is created
automagically using the @property/@synthesize syntax.
Since a release was sent to aViewController, what keeps that object
from being nuked at the end of the run loop? There must be another
retain happening somewhere, right?
Have a look at the definition for the property myViewController - it
should include the 'retain' attribute, which tells you that the object
is retained when it is assigned. In which case, it won't be nuked.
I don't think you can see the code generated by @synthesise, as it
probably doesn't exist as Objective-C anywhere - but you can
disassemble it. I could be wrong though...
--Graham
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