How to know if a UITextField in iOS has blank spaces

Question

I have a UITextField where user can enter a name and save it. But, user should not be allowed to enter blank spaces in the textFiled.

1 - How can I find out,

Answer 1

I had a same condition not allowing user to input blank field

Here is my code and check statement

- (IBAction)acceptButtonClicked:(UIButton *)sender {
if ([self textFieldBlankorNot:fullNametext]) {
        fullNametext.text=@"na";
    }
// saving value to dictionary and sending to server

}

-(BOOL)textFieldBlankorNot:(UITextField *)textfield{
    NSString *rawString = [textfield text];
    NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    NSString *trimmed = [rawString stringByTrimmingCharactersInSet:whitespace];
    if ([trimmed length] == 0)
        return YES;
    else
        return NO;
}