Code to calculate height of current device's keyboard

KeyboardHeightDetector.swift

struct ScreenSize {
    static let width = UIScreen.main.bounds.size.width
    static let height = UIScreen.main.bounds.size.height
    static let maxLength = max(ScreenSize.width, ScreenSize.height) //Gets the Height
    static let minLength = min(ScreenSize.width, ScreenSize.height) //Gets the Width
}

//Contains the dimensions of the devices
fileprivate struct KeybDimensions{
    //iPod touch(7), iPhone 5, iPhone 5s, iPhone 5C, iPhone SE
    static let iPhone5Height: CGFloat = 568
    static let iPhone5Width: CGFloat = 320
    
    //Keyboard and toolbar height
    static let i5KeybP: CGFloat = 216       //Portrait keyb without toolbar
    static let i5KeybPTool: CGFloat = 260   //Portrait keyb with toolbar
    static let i5KeybL: CGFloat = 162       //Landscape keyb without toolbar
    static let i5KeybLTool: CGFloat = 200   //Landscape keyb with toolbar
    static let i5PToolbar: CGFloat = i5KeybPTool-i5KeybP    //Portrait toolbar
    static let i5LToolbar: CGFloat = i5KeybLTool-i5KeybL    //Landscape toolbar
    
    //iPhone 6, iPhone 6s, iPhone 7, iPhone 8, iPhone SE2
    static let iPhone6Height: CGFloat = 667
    static let iPhone6Width: CGFloat = 375
    
    //Keyboard and toolbar height
    static let i6KeybP: CGFloat = 216
    static let i6KeybPTool: CGFloat = 260
    static let i6KeybL: CGFloat = 162
    static let i6KeybLTool: CGFloat = 200
    static let i6PToolbar: CGFloat = i6KeybPTool-i6KeybP
    static let i6LToolbar: CGFloat = i6KeybLTool-i6KeybL
    
    //iPhone 6 Plus, iPhone 6s Plus, iPhone 7 Plus, iPhone 8 Plus
    static let iPhonePlusHeight: CGFloat = 736
    static let iPhonePlusWidth: CGFloat = 414
    
    static let iPlusKeybP: CGFloat = 226
    static let iPlusKeybPTool: CGFloat = 271
    static let iPlusKeybL: CGFloat = 162
    static let iPlusKeybLTool: CGFloat = 200
    static let iPlusPToolbar: CGFloat = iPlusKeybPTool-iPlusKeybP
    static let iPlusLToolbar: CGFloat = iPlusKeybLTool-iPlusKeybL
    
    //iPhone XR, iPhone Xs Max, iPhone 11, iPhone 11 Pro Max
    static let iPhoneMaxHeight: CGFloat = 896
    static let iPhoneMaxWidth: CGFloat = 414
    
    static let iMaxKeybP: CGFloat = 301
    static let iMaxKeybPTool: CGFloat = 346
    static let iMaxKeybL: CGFloat = 171
    static let iMaxKeybLTool: CGFloat = 209
    static let iMaxPToolbar: CGFloat = iMaxKeybPTool-iMaxKeybP
    static let iMaxLToolbar: CGFloat = iMaxKeybLTool-iMaxKeybL
    
    //iPhone X, iPhone Xs, iPhone 11 Pro, 12 mini
    static let iPhoneXHeight: CGFloat = 812
    static let iPhoneXWidth: CGFloat = 375
    
    static let iXKeybP: CGFloat = 291
    static let iXKeybPTool: CGFloat = 336
    static let iXKeybL: CGFloat = 171
    static let iXKeybLTool: CGFloat = 209
    static let iXPToolbar: CGFloat = iXKeybPTool-iXKeybP
    static let iXLToolbar: CGFloat = iXKeybLTool-iXKeybL
    
    //iPhone 12, iPhone 12 Pro
    static let iPhone12ProHeight: CGFloat = 844
    static let iPhone12ProWidth: CGFloat = 390
    
    static let i12ProKeybP: CGFloat = 291
    static let i12ProKeybPTool: CGFloat = 336
    static let i12ProKeybL: CGFloat = 181
    static let i12ProKeybLTool: CGFloat = 219
    static let i12ProPToolbar: CGFloat = i12ProKeybPTool-i12ProKeybP
    static let i12ProLToolbar: CGFloat = i12ProKeybLTool-i12ProKeybL
    
    //iPhone 12, iPhone 12 Pro MAx
    static let iPhoneProMaxHeight: CGFloat = 926
    static let iPhoneProMaxWidth: CGFloat = 428
    
    static let i12ProMaxKeybP: CGFloat = 301
    static let i12ProMaxKeybPTool: CGFloat = 346
    static let i12ProMaxKeybL: CGFloat = 181
    static let i12ProMaxKeybLTool: CGFloat = 219
    static let i12ProMaxPToolbar: CGFloat = i12ProMaxKeybPTool-i12ProMaxKeybP
    static let i12ProMaxLToolbar: CGFloat = i12ProMaxKeybLTool-i12ProMaxKeybL
    
    //iPadPro 12.9
    static let iPadPro12Height: CGFloat = 1366
    static let iPadPro12Width: CGFloat = 1024
    
    static let iPP12KeybP: CGFloat = 348
    static let iPP12KeybPTool: CGFloat = 403
    static let iPP12KeybL: CGFloat = 443
    static let iPP12KeybLTool: CGFloat = 498
    static let iPP12PToolbar: CGFloat = iPP12KeybPTool-iPP12KeybP
    static let iPP12LToolbar: CGFloat = iPP12KeybLTool-iPP12KeybL
    
    //iPadPro 11
    static let iPadPro11Height: CGFloat = 1194
    static let iPadPro11Width: CGFloat = 834
    
    static let iPP11KeybP: CGFloat = 285
    static let iPP11KeybPTool: CGFloat = 340
    static let iPP11KeybL: CGFloat = 373
    static let iPP11KeybLTool: CGFloat = 428
    static let iPP11PToolbar: CGFloat = iPP11KeybPTool-iPP11KeybP
    static let iPP11LToolbar: CGFloat = iPP11KeybLTool-iPP11KeybL
    
    //iPadPro 9.7
    static let iPadPro9Height: CGFloat = 1024
    static let iPadPro9Width: CGFloat = 768
    
    static let iPP9KeybP: CGFloat = 265
    static let iPP9KeybPTool: CGFloat = 320
    static let iPP9KeybL: CGFloat = 353
    static let iPP9KeybLTool: CGFloat = 408
    static let iPP9PToolbar: CGFloat = iPP9KeybPTool-iPP9KeybP
    static let iPP9LToolbar: CGFloat = iPP9KeybLTool-iPP9KeybL
    
    //iPadAir
    static let iPadAirHeight: CGFloat = 1180
    static let iPadAirWidth: CGFloat = 820
    
    static let iPAKeybP: CGFloat = 282
    static let iPAKeybPTool: CGFloat = 337
    static let iPAKeybL: CGFloat = 367
    static let iPAKeybLTool: CGFloat = 422
    static let iPAPToolbar: CGFloat = iPAKeybPTool-iPAKeybP
    static let iPALToolbar: CGFloat = iPAKeybLTool-iPAKeybL
    
    //iPad 8 gen
    static let iPad8Height: CGFloat = 1080
    static let iPad8Width: CGFloat = 810
    
    static let iP8KeybP: CGFloat = 265
    static let iP8KeybPTool: CGFloat = 320
    static let iP8KeybL: CGFloat = 353
    static let iP8KeybLTool: CGFloat = 408
    static let iP8PToolbar: CGFloat = iP8KeybPTool-iP8KeybP
    static let iP8LToolbar: CGFloat = iP8KeybLTool-iP8KeybL
}
//Contains the dimension of each device's keyboard
 fileprivate struct KeybDevice {
    //iPod touch(7), iPhone 5, iPhone 5s, iPhone 5C, iPhone SE
    static let iPhone5_SE_iPod = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength <= KeybDimensions.iPhone5Height && ScreenSize.minLength <= KeybDimensions.iPhone5Width
    
    //iPhone 6, iPhone 6s, iPhone 7, iPhone 8, iPhone SE2
    static let iPhone6_7_8_SE = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength == KeybDimensions.iPhone6Height && ScreenSize.minLength == KeybDimensions.iPhone6Width
    
    //iPhone 6 Plus, iPhone 6s Plus, iPhone 7 Plus, iPhone 8 Plus
    static let iPhonePlus = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength == KeybDimensions.iPhonePlusHeight && ScreenSize.minLength == KeybDimensions.iPhonePlusWidth
    
    //iPhone XR, iPhone Xs Max, iPhone 11, iPhone 11 Pro Max
    static let iPhoneMax = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength == KeybDimensions.iPhoneMaxHeight && ScreenSize.minLength == KeybDimensions.iPhoneMaxWidth
    
    //iPhone X, iPhone Xs, iPhone 11 Pro, 12 mini
    static let iPhoneX_Xs_11P = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength == KeybDimensions.iPhoneXHeight && ScreenSize.minLength == KeybDimensions.iPhoneXWidth
    
    //iPhone 12, iPhone 12 Pro
    static let iPhone12_12P = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength == KeybDimensions.iPhone12ProHeight && ScreenSize.minLength == KeybDimensions.iPhone12ProWidth
    
    //iPhone 12, iPhone 12 Pro MAx
    static let iPhone12PM = UIDevice.current.userInterfaceIdiom == .phone && ScreenSize.maxLength == KeybDimensions.iPhoneProMaxHeight && ScreenSize.minLength == KeybDimensions.iPhoneProMaxWidth
    
    //iPadPro 12.9
    static let iPadPro12 = UIDevice.current.userInterfaceIdiom == .pad && ScreenSize.maxLength == KeybDimensions.iPadPro12Height && ScreenSize.minLength == KeybDimensions.iPadPro12Width
    
    //iPadPro 11
    static let iPadPro11 = UIDevice.current.userInterfaceIdiom == .pad && ScreenSize.maxLength == KeybDimensions.iPadPro11Height && ScreenSize.minLength == KeybDimensions.iPadPro11Width
    
    //iPadPro 9.7
    static let iPadPro9 = UIDevice.current.userInterfaceIdiom == .pad && ScreenSize.maxLength == KeybDimensions.iPadPro9Height && ScreenSize.minLength == KeybDimensions.iPadPro9Width
    
    //iPadAir
    static let iPadAir = UIDevice.current.userInterfaceIdiom == .pad && ScreenSize.maxLength == KeybDimensions.iPadAirHeight && ScreenSize.minLength == KeybDimensions.iPadAirWidth
    
    //iPad 8 gen
    static let iPad8Gen = UIDevice.current.userInterfaceIdiom == .pad && ScreenSize.maxLength == KeybDimensions.iPad8Height && ScreenSize.minLength == KeybDimensions.iPad8Width
    
    //iPad 8 gen
    static let genericPad = UIDevice.current.userInterfaceIdiom == .pad 
}

//Calculates the keyboard height based on the device
func calculateKeyboardHeight() -> CGFloat{
    var height: CGFloat = 0.0
    if UIDevice.current.orientation == .landscapeLeft || UIDevice.current.orientation == .landscapeRight {
        if KeybDevice.iPhone5_SE_iPod{
            height = KeybDimensions.i5KeybL //Returns landscape height without toolbar
        }  else if KeybDevice.iPhone6_7_8_SE{
            height = KeybDimensions.i6KeybL
        } else if KeybDevice.iPhonePlus{
            height = KeybDimensions.iPlusKeybL
        } else if KeybDevice.iPhoneMax{
            height = KeybDimensions.iMaxKeybL
        } else if KeybDevice.iPhoneX_Xs_11P{
            height = KeybDimensions.iXKeybL
        } else if KeybDevice.iPhone12_12P{
            height = KeybDimensions.i12ProKeybL
        } else if KeybDevice.iPhone12PM{
            height = KeybDimensions.i12ProMaxKeybL
        } else if KeybDevice.iPadPro12{
            height = KeybDimensions.iPP12KeybL
        } else if KeybDevice.iPadPro11{
            height = KeybDimensions.iPP11KeybL
        } else if KeybDevice.iPadPro9{
            height = KeybDimensions.iPP9KeybL
        } else if KeybDevice.iPadAir{
            height = KeybDimensions.iPAKeybL
        } else if KeybDevice.iPad8Gen{
            height = KeybDimensions.iP8KeybL
        } else if KeybDevice.genericPad{
            height = KeybDimensions.iP8KeybL //using this as generic height
        }
    } else {
        if KeybDevice.iPhone5_SE_iPod{
            height = KeybDimensions.i5KeybP //Returns portrait height without toolbar
        }  else if KeybDevice.iPhone6_7_8_SE{
            height = KeybDimensions.i6KeybP
        } else if KeybDevice.iPhonePlus{
            height = KeybDimensions.iPlusKeybP
        } else if KeybDevice.iPhoneMax{
            height = KeybDimensions.iMaxKeybP
        } else if KeybDevice.iPhoneX_Xs_11P{
            height = KeybDimensions.iXKeybP
        } else if KeybDevice.iPhone12_12P{
            height = KeybDimensions.i12ProKeybP
        } else if KeybDevice.iPhone12PM{
            height = KeybDimensions.i12ProMaxKeybP
        } else if KeybDevice.iPadPro12{
            height = KeybDimensions.iPP12KeybP
        } else if KeybDevice.iPadPro11{
            height = KeybDimensions.iPP11KeybP
        } else if KeybDevice.iPadPro9{
            height = KeybDimensions.iPP9KeybP
        } else if KeybDevice.iPadAir{
            height = KeybDimensions.iPAKeybP
        } else if KeybDevice.iPad8Gen{
            height = KeybDimensions.iP8KeybP
        } else if KeybDevice.genericPad{
            height = KeybDimensions.iP8KeybP //using this as generic height
        }
    }
    return height
}

/*
Yes it's a lot!
What you have here is:
A struct that contains the screen dimensions;
A struct that contains the dimensions of each keyboard;
A struct that, based on the device height, detects the device you're on;
A function that returns the dimension of the keyboard based on the device you're on;

The latter is the big wheel since it'll effectively return the height of the keyboard.
If you're setting up a custom keyboard, remember that those heights include the safe area when it comes to iPhone with the notch.
*/