（iphone）uiimage，view，subviews memory management

Question

I need to release uiimage/view/subviews when I want, and have a few questions regarding proper practice of releasing them.

1. [imageView removeFromSuperview] would release the imageView and imageView.image?

2. view = nil; would release its subviews/and associated uiimages recursively? if not, should I implement a recursive function to release a view's subviews?

Thank you

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Edit.

I looked at UIView's library reference

addSubview --

This method retains view and sets its next responder to the receiver, which is its new superview.

removeFromSuperview --

If the receiver's superview is not nil, the superview releases the receiver. If you plan to reuse a view, be sure to retain it before calling this method and release it again later as appropriate.

still not sure [imageView release] releases uiImage associated with it, and would I still need recursive releasing of subviews. ie a view's getting dealloced would automatically guarantee it's subviews release?

Answer 1

When you do [imageView removeFromSuperview] , it won't release anything. You need to so [imageView release] afterward. Even so, you still need to put your memory releasing for that view in imageView 's dealloc.

Answer 2

[imageView removeFromSuperview] would release the imageView and imageView.image?

removeSuperView calls release on the view , but you should pay attention to the views retain count. Just because you called removeFromSuperview doesn't mean it's doing what you want.

view = nil; would release its subviews/and associated uiimages recursively? if not, should I implement a recursive function to release a view's subviews?

No, you probably want to do (depending on how you've managed your subviews during their creation. If the superview was their only reference, they likely have a retain count of 1 and therefore calling release after calling removeFromSuperview will result in an error):

for (UIView* subview in view){
    [subview removeFromSuperView];
    [subview release]
}
[view release];

EDIT: To answer your final question, no, calling release on a view does not automatically call release on all of its subviews. You have to do it yourself, whether with release or with removeFromSuperview.