Question

In my HypnosisViewController.m I have this code for adding a UIView subclass, HypnosisView to the window. My goal is to set the property UIColor circleColor of my HypnosisView instance when a UISegmented control changes its value.

- (void) loadView 
{
    CGRect frame = [[UIScreen mainScreen] bounds];
    HypnosisView *v = [[HypnosisView alloc] initWithFrame:frame];
    CGRect segment = CGRectMake(200, 300, 75, 20);
    UISegmentedControl *colors = [[UISegmentedControl alloc]initWithFrame:segment];
    [v addSubview:colors];
    [self setView:v];
}

then I would like from here to use an IBAction outlet as so, but xcode does not recognize my getter/setter method in my custom class when using this code:

- (IBAction)setRingColor:(id)sender
{
    if ([sender selectedSegmentIndex] == 0)
    {
        [self.view setCircleColor:[UIColor redColor]]; 
    }
}

How can I communicate this to my custom UIView?

Answer 1

You have to downcast it to its derived type.

[((HypnosisView *)self.view) setCircleColor:[UIColor redColor]];