Question

I would like to change the background color of my app programmatically, not IB. Is it possible to get both a Swift and Obj-C answer.

Answer 1

You can set the backgroundColor property of whatever view it is you have on screen.

In Objective-C:

self.view.backgroundColor = [UIColor redColor];

In Swift:

self.view.backgroundColor = .red

or if it’s the main window you’re after,

In Objective-C:

self.window.backgroundColor = [UIColor redColor];

In Swift:

self.window.backgroundColor = .red