Change attributes on view controller on alert selection (objective c) - ios

Question

I'm new to objective c and need some help. I've only one view controller which should show when as default an array called factbook. However I'd like to change the array by an alert validation. So that if the user would like to see sport he could just click on sport on the alert view and the current view controller would change the theme name to sport, the background color to the color scheme i'd like for the sport theme and the text to the sport facts array. Every help is welcome!
- (void)viewDidLoad {
[super viewDidLoad];
// init for displaying facts
self.factBook = [[FactBook alloc] init];
self.colorWheel = [[ColorWheel alloc] init];
self.view.backgroundColor = [self.colorWheel randomColor];
self.funFactLabel.text = [self.factBook randomFact];
}
- (IBAction)showFunFact:(UIButton *)sender {
self.view.backgroundColor = [self.colorWheel randomColor];
funFactLabel.text = [self.factBook randomFact];
}
- (IBAction)changeTheme:(UIButton *)sender {
// to sport
[changeThemeNotification addButton:#"change to sport" validationBlock:^BOOL{
BOOL passedValidation = true;
return passedValidation;
} actionBlock:^{
// segue to sport
self.themeName.text = #"Sport";
self.sportFactBook = [[SportFactBook alloc] init];
self.sportColorWheel = [[SportColorWheel alloc] init];
// not working
// self.funFactLabel = [self.sportFactBook randomSportFact];
self.view.backgroundColor = [self.sportColorWheel randomColor];
}];
//...
}

Answer 1

Assuming that this comment
// not working
// self.funFactLabel = [self.sportFactBook randomSportFact];
is the part you want to fix. If you are updating a label, just change its text
self.funFactLabel.text = [self.sportFactBook randomSportFactText];
randomSportFactText should return an NSString*.
If you set the output to a new label object, that doesn't update the view -- it just disassociates the outlet from the label in the view.
If you want to change just the backgroundColor, you can do that too:
self.funFactLabel.backgroundColor = [UIColor redColor];