Need help figuring out how to save my BOOL inside my button - ios

Question

I placed a BOOL inside a UIButton. If I click on the Button once, then I want that BOOL to always be saved so I never has to click on button again while in the game. I used the following code but it doesn't work to save. However, the code should work. It's mainly the final line of code that makes the saving not work. What am I doing wrong?
-(void)viewDidLoad{
[[NSUserDefaults standardUserDefaults] setBool:REDguy forKey:#"save"];
if (REDguy==[[NSUserDefaults standardUserDefaults]synchronize]) {
MAN.image=[UIImage imageNamed:#"RED.png"];
}
REDguy=[[NSUserDefaults standardUserDefaults]boolForKey:#"save"];
}
EDIT:
if (REDguy==YES) {
[[NSUserDefaults standardUserDefaults] setBool:REDguy forKey:#"save"];
REDguy =[[NSUserDefaults standardUserDefaults]boolForKey:#"save"];
MAN.image=[UIImage imageNamed:#"RED.png"];
}

Answer 1

This is an assumption since you didn't really clarify what else is going on in your code, but it looks like your bool REDGuy is always going to be be NO on viewDidLoad, and that if condition is likely to always be false since synchronize will probably always be YES (not to mention, that comparison makes no sense and it's rarely necessary to call synchronize since synchronization with user defaults happens on its own).
A simple way to determine if a button has been pressed before is to add the following to your button action method.
- (void)buttonAction:(id)sender {
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"save"];
}
- (void)viewDidLoad {
BOOL hasSaved = [[NSUserDefaults standardUserDefaults] boolForKey:#"save"];
if (hasSaved) {
// You can hide your button here if that's what you're going for
[yourButton setHidden:YES]
}
}
Is that what you are trying to accomplish? Determining if a specific button has been tapped before?