swift playground UITextField spawns keyboard that is too big

Question

Swift in playground on Mac OS. When the user clicks in a UItextfield, a keyboard spawns but it is very large compared to the view and only the first few keys are available.

Answer 1

In reply to Adobels (Seo 21 '19) ...

I am not sure why he proposed a different approach.

I modified dr_barlo's approach of Oct 22 '17 as follows (and it works in Xcode 11 too):

let vc = TextFieldViewController()
vc.preferredContentSize = CGSize.init(width: 768,height: 1024)
PlaygroundPage.current.liveView = vc

They all appear equivalent in results if not internal workings.

Answer 2

Instead this line

PlaygroundPage.current.liveView = MyViewController()

Write this

let window = UIWindow(frame: CGRect(x: 0,
                                    y: 0,
                                    width: 768,
                                    height: 1024))
let viewController = MyViewController()
window.rootViewController = viewController
window.makeKeyAndVisible()

PlaygroundPage.current.liveView = window

It works in Xcode 11

Answer 3

I face the same issue. It seems as if Playground has a hard-coded screen size of 768x1024 (run UIScreen.main.bounds in the Playground) and shows the keyboard according to this size, independently of the live view's actual size.

The best workaround I came up with is to increase the size of the view controller so that it matches the keyboard:

let vc = TesterViewController()
vc.preferredContentSize = vc.view.frame.size // or a custom CGSize
PlaygroundPage.current.liveView = vc

Of course this makes the view larger than you might want it to be, so I only use this workaround when I really have to access the on-screen keyboard for testing.