-
-
Save unixb0y/d8a6c7bf7ae923893b6e758b7ad2bdb7 to your computer and use it in GitHub Desktop.
SWIFT: Crop image to square (& resize)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// | |
// RBResizer.swift | |
// Locker | |
// | |
// Created by Hampton Catlin on 6/20/14. | |
// Copyright (c) 2014 rarebit. All rights reserved. | |
// | |
import UIKit | |
func RBSquareImageTo(image: UIImage, size: CGSize) -> UIImage { | |
return RBResizeImage(RBSquareImage(image), targetSize: size) | |
} | |
func RBSquareImage(image: UIImage) -> UIImage { | |
var originalWidth = image.size.width | |
var originalHeight = image.size.height | |
var x: CGFloat = 0.0 | |
var y: CGFloat = 0.0 | |
var edge: CGFloat = 0.0 | |
if (originalWidth > originalHeight) { | |
// landscape | |
edge = originalHeight | |
x = (originalWidth - edge) / 2.0 | |
y = 0.0 | |
} else if (originalHeight > originalWidth) { | |
// portrait | |
edge = originalWidth | |
x = 0.0 | |
y = (originalHeight - originalWidth) / 2.0 | |
} else { | |
// square | |
edge = originalWidth | |
} | |
var cropSquare = CGRectMake(x, y, edge, edge) | |
var imageRef = CGImageCreateWithImageInRect(image.CGImage, cropSquare); | |
return UIImage(CGImage: imageRef, scale: UIScreen.mainScreen().scale, orientation: image.imageOrientation)! | |
} | |
func RBResizeImage(image: UIImage, targetSize: CGSize) -> UIImage { | |
let size = image.size | |
let widthRatio = targetSize.width / image.size.width | |
let heightRatio = targetSize.height / image.size.height | |
// Figure out what our orientation is, and use that to form the rectangle | |
var newSize: CGSize | |
if(widthRatio > heightRatio) { | |
newSize = CGSizeMake(size.width * heightRatio, size.height * heightRatio) | |
} else { | |
newSize = CGSizeMake(size.width * widthRatio, size.height * widthRatio) | |
} | |
// This is the rect that we've calculated out and this is what is actually used below | |
let rect = CGRectMake(0, 0, newSize.width, newSize.height) | |
// Actually do the resizing to the rect using the ImageContext stuff | |
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0) | |
image.drawInRect(rect) | |
let newImage = UIGraphicsGetImageFromCurrentImageContext() | |
UIGraphicsEndImageContext() | |
return newImage | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment