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PONSUndoManager calls my "restore" method repeatedly
 

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  1. PONSUndoManager calls my "restore" method repeatedly
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    <p>I have a <code>UITextView</code> with a formatting toolbar. After I press the "bold" button, it changes the text/selection and registers the operation with the text view's <code>NSUndoManager</code>.</p> <p>When you try to undo, <code>restoreText:</code> is called over and over until you kill the app</p> <p>Some sample code:</p> <pre><code>- (void)bold { NSRange range = self.textView.selectedRange; NSRange oldRange = range; NSString *oldText = self.textView.text; NSString *selection = [self.textView.text substringWithRange:range]; self.textView.scrollEnabled = NO; self.textView.text = [self.textView.text stringByReplacingCharactersInRange:range withString:[NSString stringWithFormat:@"&lt;b&gt;%@&lt;/b&gt;", selection]]; self.textView.scrollEnabled = YES; if (range.length == 0) { // If nothing was selected range.location += 3; // Place selection between tags } else { range.location += range.length + 7; // Place selection after tag range.length = 0; } self.textView.selectedRange = range; [[self.textView.undoManager prepareWithInvocationTarget:self] restoreText:oldText withRange:oldRange]; [self.textView.undoManager setActionName:@"bold"]; } - (void)restoreText:(NSString *)text withRange:(NSRange)range { NSLog(@"restoreText:%@ %@",text, [NSNumber numberWithBool:[self.textView.undoManager isUndoing]]); NSString *oldText = self.textView.text; NSRange oldRange = self.textView.selectedRange; self.textView.scrollEnabled = NO; self.textView.text = text; self.textView.scrollEnabled = YES; self.textView.selectedRange = range; [[self.textView.undoManager prepareWithInvocationTarget:self] restoreText:oldText withRange:oldRange]; } </code></pre> <p>And the console:</p> <pre><code>2012-10-04 18:10:14.207 undotest[8861:c07] restoreText: 1 2012-10-04 18:10:14.633 undotest[8861:c07] restoreText:&lt;b&gt;&lt;/b&gt; 0 2012-10-04 18:10:15.117 undotest[8861:c07] restoreText: 0 2012-10-04 18:10:15.589 undotest[8861:c07] restoreText:&lt;b&gt;&lt;/b&gt; 0 2012-10-04 18:10:16.017 undotest[8861:c07] restoreText: 0 2012-10-04 18:10:16.557 undotest[8861:c07] restoreText:&lt;b&gt;&lt;/b&gt; 0 </code></pre> <p>I've tried checking for <code>[self.textView.undoManager isUndoing]</code> before registering the invocation on <code>restoreText:withRange:</code>, but that crashes:</p> <pre><code>2012-10-04 18:10:49.297 undotest[8904:c07] restoreText: 1 2012-10-04 18:10:53.412 undotest[8904:c07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '_endUndoGroupRemovingIfEmpty:: WebThreadSafeUndoManager 0x76551e0 is in invalid state, endUndoGrouping called with no matching begin ' </code></pre> <p>This code was working on iOS5 but stopped working on iOS6. I've filed a bug with Apple, but I'm not sure if I'm doing something wrong</p>
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