Question

I have got some questions about autorelease feature.

Please advice..

Q1) Does it have a any sense or value about calling retain or release to autoreleased object?

ex1) 
 UIView *viewTest = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 400)] autorelease];
[self.view addSubview:viewTest];

In this condition, viewtest object will be released in future?
Or need to add a line ‘[viewTest release];’?

ex2)

UIView *viewTest = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 400)] autorelease];
[viewTest release];

In this case, viewTest will be autorelease?

Q2) Where does autoreleased object be destroyed?

Answer 1

Q1) Does it have a any sense or value about calling retain or release to autoreleased object?

Not really, the object will get released when the autoreleasepool is drained anyway. Take a look at this

Q2) Where does autoreleased object be destroyed?

The autoreleased object is destroyed when the NSAutoreleasePool is drained, or at the end of the @autoreleasepool construct, which basically does the same thing.