Appending a string to a UITextField

How can I append a string by adding '.' onto a UITextField? I have tried this: [textfield.text stringByAppendingString:@"."]; but I am getting strange beh开发者_Go百科avior - it converts the last character into a . instead of adding on. (I also use this code to add 0-9 chars and it works perfectly.)

Any other methods of appending the . and/or an explanations for this?

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You need to do textfield.text = [textfield.text stringByAppendingString:@"."]; since the stringByAppendingString: returns a new string, it doesn't modify the existing one (as strings are immutable by default).

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Try this:

textfield.text = [NSString stringWithFormat:@"%@.", textfield.text];

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Swift

CommentTextField.text = CommentTextField.text?.stringByAppendingString(string)