"self.delegate = self" not working on iOS using ARC

Question

I am working on an iOS SDK 4 project with ARC enabled.

My class MyTextView (derived from UITextView with UITextViewDelegate protocol) implements the following static method:

+ (void)showInViewController:(UIViewController*)viewController
{
    MyTextView *textEdit = [[MyTextView alloc] init];
    textEdit.delegate = textEdit;
    [viewController.view addSubview:textEdit];

    // Show the keyboard
    [textEdit becomeFirstResponder];
}

In one of my view controllers I call the following:

[MyTextView showInViewController:self]

This crashes with warning: Unable to restore previously selected frame. on becomeFirstResponder. Looks like some stack related crash because of some cycle. I am fairly new to ARC. The delegate property of UITextView is defined as assign (shouldn't ARC interpret that as weak?). I know this approach is rather strange memory-wise. However, I wanted to know if ARC can handle things like that. Obviously it can't. Any idea what might be the problem and how to solve it?

Answer 1

old post, but here is the answer:

http://www.cocoabuilder.com/archive/cocoa/282093-uitextview-as-its-own-delegate-infinite-loop-on-keyboard-select.html

or here aswell

self.delegate = self; what's wrong in doing that?

Answer 2

I don't think it has anything to do with the ARC and memory management, but just a more fundamental problem that a UITextView cannot be a delegate of itself. It gets locked in a loop. Put a logging message in textViewDidChangeSelection and you'll see it gets repeatedly invoked. Not a memory issue, methinks, but rather just a logic issue with UITextView delegates. Even if you don't do your problematic showInViewController but just create a standard UITextView subclass and try to set its delegate to itself, you'll see the same curious behavior.