How to call CGRectDivide in Swift?

Question

I'm trying to call CGRectDivide and can't figure out the syntax in Swift. The language guide doesn't seem to be any help.

Here's the template:

CGRectDivide(rect: CGRect, slice: CMutablePointer<CGRect>, remainder: CMutablePointer<CGRect>, amount: CGFloat, edge: CGRectEdge)

My code:

var r = UIScreen.mainScreen().bounds
var mySlice: CGRect
var myRemainder: CGRect
CGRectDivide(rect: CGRect, slice: mySlice<CGRect>, remainder: myRemainder<CGRect>, amount: 44.0, edge: CGRectEdge.MaxYEdge)

That gives me an error: "Cannot specialize a non-generic definition"

I'm stumped. So much for Swift being a very readable language.

Answer 1

If you Command-click on a CGRect symbol in your code, you'll be taken to the Swift declaration of struct CGRect. In its first extension you'll find a number of useful methods, including the following:

Swift 2:
func divide(atDistance: CGFloat, fromEdge: CGRectEdge) -> (slice: CGRect, remainder: CGRect)

Swift 3:
func divide(_ atDistance: CGFloat, fromEdge: CGRectEdge) -> (slice: CGRect, remainder: CGRect)

Which you could use like this:

import UIKit

let rect = CGRect(x: 0, y: 0, width: 100, height: 100)
let (slice, remainder) = rect.divide(10.0, fromEdge: .MinXEdge) // Swift 3: .minXEdge
print("rect: \(rect)") // prints "rect: (0.0,0.0,100.0,100.0)"
print("slice: \(slice)") // prints "slice: (0.0,0.0,10.0,100.0)"
print("remainder: \(remainder)") // prints "remainder: (10.0,0.0,90.0,100.0)"

Answer 2

Just sample, how you can try to do it:

let rect = CGRectMake(0, 0, 100, 100)
var sliceRect = CGRectZero
var remainderRect = CGRectZero
CGRectDivide (rect, &sliceRect, &remainderRect, 30.0, "CGRectEdge");

print(sliceRect)
print(remainderRect)

"CGRectEdge" should be replaced by: