How to know whether a UITextField contains a specific character

Question

How would I say that if a UITextField has @"-" in it, do something. Right now my code is like this. It doesn't seem to work:

if (MyUITextField.text == @"-") {
    NSRange range = {0,1};
    [a deleteCharactersInRange:range];
    MyUITextField.text = MyUILabel.text;
}

I know that I am doing something very wrong with the code. Please help.

Answer 1

try changing == to [MyUITextField.text isEqualToString:@"-"]

as == tests to see if they are the same object, while isEqualToString compares the contents of the strings.

Answer 2

Assuming your string is defined as:

NSString *str = @"foo-bar";

To check if your string contains "-" you can do the following:

if ([str rangeOfString:@"-"].length > 0)
{
    NSLog(@"Contains -");
}

It looks like you wanted to delete the first character if a string starts with a given character. In this case you can do something like this:

if ([str hasPrefix:@"f"])
{
    NSLog(@"Starts with f");
}