Question

My question is simple.

I want to use CAGradientLayer to make a nice gradient background for my UIView.

But the problem is that it displays an ugly violet color instead of my desired wonderful red color.

Here is the code I’m using :

- (void)viewWillAppear:(BOOL)animated {
    CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = self.view.bounds;
    gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor blackColor] CGColor], (id)[[UIColor blackColor] CGColor], (id)[[UIColor colorWithRed:107 green:0 blue:27 alpha:1] CGColor], nil];
    [self.view.layer insertSublayer:gradient atIndex:0];
}

As a result, I can see that :

And that is not what I want… If someone can help me with this.

Thanks ! Cheers 🙂

Answer 1

You must use fractions, not whole numbers:

[UIColor colorWithRed:107/255.f green:0.f blue:27/255.f alpha:1.f];

Of course, be wary of integer division. That bastard always gets me in these situations.