change font color of empty uitextfield - ios

Question

I have a UITextfield and when the text field is equal to "test", I want to clear out the text field and change the font color to green. The code below almost accomplishes it.
- (void)editingDidBegin:(id)sender {
UITextField *txtfld = (UITextField*)sender;
if ([txtfld.text isEqualToString:(#"test")]) {
txtfld.text = #" ";
[txtfld setFont:regularFont];
[txtfld setTextColor:[UIColor greenColor]];
}
}
The only problem is I want to change:
txtfld.text = #" ";
to:
txtfld.text = #"";
When I do that, the font color remains the original black color. If I leave it as #" " then the font changes to green. Any ideas? Thanks in advance.
Scenario:
(1) user enters nothing in the text field and clicks the submit button - works
(2) the submit button updates the text field with the word "test" and makes it red - works (3) when the user goes back to the text field I want the word test deleted and when the user types for all the text to green. - Doesn't work
Note: I placed my code in the event "Editing Did Begin" as i figured when the user goes to update the field it should clear the text and allow them to type in green font color.

Answer 1

It is interesting that when you set text to #"" or nil, and also set textColor in UIControlEventEditingDidBegin event handler, the textColor is not set what so ever. So the silver lining is to set textColor at a later time, also see the comments in code:
- (IBAction)textEditingDidBegin:(id)sender
{
UITextField *field = (UITextField *)sender;
if ([field.text isEqualToString:#"test"]) {
[field setText:#""];
[self performSelector:#selector(setColor:) withObject:sender afterDelay:0.01];
[field setFont:[UIFont fontWithName:#"Georgia" size:15]];
}
}
- (void)setColor:(id)sender
{
// See this line of code closely, do NOT use sender, use textField property in your view controller class
[self.textField setTextColor:[UIColor greenColor]];
}

Answer 2

I just tested your code. It should work. You are reverting the color elsewhere.
You can test it in a new single view project with this code:
#import "ViewController.h"
#interface ViewController () <UITextFieldDelegate>
#property (nonatomic, weak) IBOutlet UITextField *textField;
-(IBAction)checkColor:(UIButton *)sender;
#end
#implementation ViewController
-(void)checkColor:(UIButton *)sender {
_textField.text = #"check color";
}
-(void)textFieldDidEndEditing:(UITextField *)textField {
if ([textField.text isEqualToString:#"test"]) {
textField.text = #"";
textField.textColor = [UIColor greenColor];
}
else {
textField.textColor = [UIColor darkTextColor];
}
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return NO;
}
#end