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I want to be able to replace some text in an UITextView programatically, so I wrote this method as an UITextView category: - (void) replaceCharactersInRange:(NSRange)range withString:(NSString *)newText{ self.scrollEnabled = NO; NSMutableString *textStorage = [self.text mutableCopy]; [textStorage replaceCharactersInRange:range withString:newText]; //replace text but undo manager is not working well [[self.undoManager prepareWithInvocationTarget:self] replaceCharactersInRange:NSMakeRange(range.location, newText.length) withString:[textStorage substringWithRange:range]]; NSLog(@"before replacing: canUndo:%d", [self.undoManager canUndo]); //prints YES self.text = textStorage; NSLog(@"after replacing: canUndo:%d", [self.undoManager canUndo]); //prints NO if (![self.undoManager isUndoing])[self.undoManager setActionName:@"replace characters"]; [textStorage release]; //new range: range.location = range.location + newText.length; range.length = 0; self.selectedRange = range; self.scrollEnabled = YES; } It works but NSUndoManager stops working (it seems to be reset) just after doing self.text=textStorage I have found a private API: -insertText:(NSString *) that can do the job but who knows if Apple is going to approve my app if I use it. Is there any way to get text replaced in UITextView with NSUndoManager Support? Or maybe I am missing something here?

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