What to use for non top level GUI elements - strong or weak - depends on how you are going to use their outlets. If you have a weak reference
@property (nonatomic, weak) IBOutlet UIWebView *webView;
then after calling method
[webView removeFromSupeview];
your webView will be nil and it will be impossible to restore UIWebView just by adding
[self.view addSubview:webView];
If this is appropriate for you - it is better to use weak because you will free webView's memory when you do not need it.
On the other hand, in case of a strong
reference after
[webView removeFromSupeview];
webView will still have referenceCount > 0 and webView will be deallocated only if owner will free it explicitly
self.webView = nil;
or in the owner's
- (void)dealloc
together with the owner itself.
Usually there is no difference if you have static GUI. If you want to remove (not hide) some views add be able to add them later - strong references should be used.
Top level objects should be retained strong. Like
@property(nonatomic,retain) UIView *view;
in UIViewController.