change placeholder colour while validating text field

Question

I want to change the placeholder colour as red when I left the text field as empty (for example...placeholder of first text field will be changed to read while I left the first text field and starting to enter in the second text field..)

Answer 1

You need to use NSAttributedString. after validation fails change the color of the string.

-(void)methodForValidation{
   ... //code for validation
   if(validationFail){
        NSMutableAttributedString *attriButedString = [[NSMutableAttributedString alloc]initWithString:yourStringHere"];
        [attriButedString addAttribute:NSForegroundColorAttributeName 
                                 value:[NSColor redColor] 
                                 range:NSMakeRange(0, lengthOfYourString)];

        [[self.yourTextField cell] setPlaceholderAttributedString:attriButedString];
   }
}