UITextView attributedText with Japanese keyboard repeats input

Question

I need to use two different fonts in text view, so I set attributed Text in textViewDidChange. But for Japanese keyboard the input character is entered repeatedly.

It works for English keyboard. It also works for Japanese keyboard when you use normal text instead of attributedText.

My code:

- (void)viewDidLoad {
    [super viewDidLoad];

    UITextView *textView = [[UITextView alloc] initWithFrame:self.view.frame];
    textView.delegate = self;
    [self.view addSubview:textView];
}

- (void)textViewDidChange:(UITextView *)textView
{
    NSLog(@"TOTAL: %@", textView.text);

    textView.attributedText = [[NSMutableAttributedString alloc] initWithString: textView.text];
}

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    NSLog(@"ADDED: %@", text);

    return YES;
}

Output:

2015-07-15 13:51:10.156 japKeyTest[32163:5765000] ADDED: a
2015-07-15 13:51:10.167 japKeyTest[32163:5765000] TOTAL: あ
2015-07-15 13:51:11.376 japKeyTest[32163:5765000] ADDED: a
2015-07-15 13:51:11.378 japKeyTest[32163:5765000] TOTAL: あああ
2015-07-15 13:51:12.054 japKeyTest[32163:5765000] ADDED: a
2015-07-15 13:51:12.055 japKeyTest[32163:5765000] TOTAL: ああああああ

Expected:

2015-07-15 13:51:10.156 japKeyTest[32163:5765000] ADDED: a
2015-07-15 13:51:10.167 japKeyTest[32163:5765000] TOTAL: あ
2015-07-15 13:51:11.376 japKeyTest[32163:5765000] ADDED: a
2015-07-15 13:51:11.378 japKeyTest[32163:5765000] TOTAL: ああ
2015-07-15 13:51:12.054 japKeyTest[32163:5765000] ADDED: a
2015-07-15 13:51:12.055 japKeyTest[32163:5765000] TOTAL: あああ

Any idea how to enter attributed text with Japanese keyboard and get normal result? (without extra characters)

Answer 1

This answer helped me figure it out: Check if markedTextRange on the UITextView is not nil. This means that the user is in the middle of inputting a multistage character. Hold off on editing the attributedText until they are done.