32 lines
1.1 KiB
Swift
32 lines
1.1 KiB
Swift
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// UIImageWithAlpha.swift
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// Befund
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//
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// Created by Artur Savitskiy on 12.09.22.
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// Copyright © 2022 MVZ Dr. Stein und Kollegen. All rights reserved.
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//
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import Foundation
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extension UIImage {
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func image(alpha: CGFloat, targetSize: CGSize) -> UIImage? {
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let size = size
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let widthRatio = targetSize.width / size.width
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let heightRatio = targetSize.height / size.height
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// Figure out what our orientation is, and use that to form the rectangle
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var newSize: CGSize
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if(widthRatio > heightRatio) {
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newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
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} else {
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newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
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}
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let rect = CGRect(origin: .zero, size: newSize)
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UIGraphicsBeginImageContextWithOptions(newSize, false, scale)
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draw(in: rect, blendMode: .normal, alpha: alpha)
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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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