Question

I am working on some simple form validation and need some assistance. Basically, I just need to make sure a UITextField doesn’t have a ‘0’ or no value whatsoever (nil) when a user runs a simple calculation. If the field does contain either/or a label will be changed to notify the user. Here is my statement:

if ([abc.text isEqualToString:@"0"] || [time.text isEqualToString:nil]) {
    self.123.text = @"Please enter a time";
} else {  whatever }

Currently the 123 label is outputting NaN if nothing is entered into the abc UITextField.

Answer 1

if (![abc.text isEqualToString:@"0"]  &&
    ![time.text == nil]) 
    {
        self.123.text = @"Please enter a time";
    }
    else     
    { 
         whatever 
    }