A collection of CGRect, CGPoint and CGSize convenience functions for Swift on OS X and iOS.
The goal is to provide clear functions for the most commonly used rect operations, even if the code savings are minimal. The reason is that function names communicate the programmer's intent more clearly than setting properties with ad-hoc calculations.
Pull requests and suggestions are welcome.
- Operators for adding, scaling sizes, applying
CGAffineTransform - Shortcut properties for corner and center points
- Offsetting, insetting and extending methods with multiple ways of specifying arguments
- Aligning and centering sizes in rects
- Copying rects with some values changed without going through a variable
- Respects the different coordinate systems on iOS and OS X
- Unit tested
For now I suggest simply adding CGRectExtensions.swift to your project. (Once CocoaPods supports Swift, a spec will be available.)
These examples are also available as a Playground in the Xcode project.
import Foundation
import CGRectExtensions
let rect = CGRect(1, 2, 100, 200) // shorter constructor
let minY = rect.minY // shortcut properties
let topCenter = rect.topCenter // OS-dependent coordinate system
let oppositeOrigin = rect.origin + rect.size // adding
let corneredRect = rect.with(x: 0, y: 0) // modified copy
let nextPageRect = rect.rectByOffsetting(dx: 100) // offsetting
let paddedRect = rect.rectByInsetting(top: 66, left: 10, right: 10) // insetting
let quarterSize = rect.size * 0.5 // scaling sizes
let corner = rect.rectByAligning(quarterSize, corner: .MinXEdge, .MinYEdge) // aligning sizes
let halfWidthSize = rect.size * (0.5, 1) // scaling sizes
let centeredRect = rect.rectByCentering(halfWidthSize) // centering sizes
let scaledRect = rect * CGAffineTransformMakeScale(2.0, 3.0)Mutating functions are also available. These are especially convenient since Swift allows modifying a struct property directly.
import Cocoa
import CGRectExtensions
let view = NSView()
view.frame.size = CGSize(width: 100, height: 200)
view.frame.bottomLeft = CGPoint(x: 1, y: 2)
view.frame.offset(25, 25)
view.frame.inset(top: 66, left: 10, right: 10)
view.frame.setSizeCentered(CGSize(50, 50))
view.frame.setSizeCentered(CGSize(50, 50), alignTo: .MinXEdge)
view.frame.setSizeAligned(CGSize(50, 50), corner: .MinXEdge, .MinYEdge)
view.frame *= CGAffineTransformMakeScale(2.0, 3.0)