83 lines
2.7 KiB
Swift
83 lines
2.7 KiB
Swift
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//
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// UIImageExtensions.swift
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// CapFinder
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//
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// Created by User on 13.02.18.
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// Copyright © 2018 User. All rights reserved.
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//
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import Foundation
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import UIKit
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extension UIImage {
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static func templateImage(named: String) -> UIImage {
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return UIImage(named: named)!.withRenderingMode(.alwaysTemplate)
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}
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/**
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Resize an image to the target size
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*/
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func resize(to targetSize: CGSize) -> UIImage {
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let rect = CGRect(x: 0, y: 0, width: targetSize.width, height: targetSize.height)
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UIGraphicsBeginImageContextWithOptions(targetSize, false, 1.0)
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self.draw(in: rect)
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let newImage = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return newImage!
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}
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/**
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Crop an image to a square, centered around the middle of the frame
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- parameter factor: The crop factor of the resulting image
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- returns: The cropped image
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*/
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func crop(factor: CGFloat) -> UIImage {
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let width = self.size.width * factor
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return crop(to: width)
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}
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/**
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Crop an image to a square, centered around the middle of the frame
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- parameter size: The height and width of the resulting image
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- returns: The cropped image
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*/
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func crop(to size: CGFloat) -> UIImage {
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var rect = CGRect(
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x: (self.size.height - size) / 2,
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y: (self.size.width - size) / 2,
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width: size,
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height: size)
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rect.origin.x *= scale
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rect.origin.y *= scale
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rect.size.width *= scale
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rect.size.height *= scale
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let imageRef = cgImage!.cropping(to: rect)
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return UIImage(cgImage: imageRef!, scale: scale, orientation: imageOrientation)
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}
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/// The (circular) image masked by a circle
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var circleMasked: UIImage? {
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let width = size.width
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let height = size.height
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let isPortrait = height > width
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let breadth = min(width, height)
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let breadthSize = CGSize(width: breadth, height: breadth)
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let breadthRect = CGRect(origin: .zero, size: breadthSize)
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UIGraphicsBeginImageContextWithOptions(breadthSize, false, scale)
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defer { UIGraphicsEndImageContext() }
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let x = isPortrait ? 0 : floor((width - height) / 2)
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let y = isPortrait ? floor((height - width) / 2) : 0
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let rect = CGRect(origin: CGPoint( x: x, y: y), size: breadthSize)
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guard let cgImage = cgImage?.cropping(to: rect) else {
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return nil
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}
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UIBezierPath(ovalIn: breadthRect).addClip()
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UIImage(cgImage: cgImage, scale: 1, orientation: imageOrientation).draw(in: breadthRect)
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return UIGraphicsGetImageFromCurrentImageContext()
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}
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}
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