如何在不引起任何失真的情况下调整和重塑UIImage？
如何在不引起任何失真的情况下调整和重塑UIImage？
提问于 2022-02-04 05:56:40
我正在使用clearbit api来获取和显示我的应用程序中的公司标识。这是伟大的工作，除了所有的标志是不同的大小，我希望他们所有的显示为一个正方形。
有没有人知道如何取一个矩形的图像，并添加额外的像素，一个给定的颜色，直到它变成方形与标志在中心？
This question似乎回答了这个问题，但它已经过时了。我还认为在this question上的最高答案是可行的，但是代码不起作用。任何帮助都是非常感谢的，谢谢！
回答 2
Stack Overflow用户
发布于 2022-02-11 10:49:41
import UIKit
extension UIImage {
func scalePreservingAspectRatio(targetSize: CGSize) -> UIImage {
// Determine the scale factor that preserves aspect ratio
let widthRatio = targetSize.width / size.width
let heightRatio = targetSize.height / size.height
let scaleFactor = min(widthRatio, heightRatio)
// Compute the new image size that preserves aspect ratio
let scaledImageSize = CGSize(
width: size.width * scaleFactor,
height: size.height * scaleFactor
)
// Draw and return the resized UIImage
let renderer = UIGraphicsImageRenderer(
size: scaledImageSize
)
let scaledImage = renderer.image { _ in
self.draw(in: CGRect(
origin: .zero,
size: scaledImageSize
))
}
return scaledImage
}
}Stack Overflow用户
发布于 2022-02-08 08:33:55
func drawImageOnCanvas(\_ useImage: UIImage, canvasColor: UIColor ) -> UIImage { let length = max(useImage.size.width, useImage.size.height) let canvasSize = CGSize.init(width: length, height: length) let rect = CGRect(origin: .zero, size: canvasSize) UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0) // fill the entire image canvasColor.setFill() UIRectFill(rect) // calculate a Rect the size of the image to draw, centered in the canvas rect let centeredImageRect = CGRect(x: (canvasSize.width - useImage.size.width) / 2, y: (canvasSize.height - useImage.size.height) / 2, width: useImage.size.width, height: useImage.size.height) // get a drawing context let context = UIGraphicsGetCurrentContext(); // "cut" a transparent rectanlge in the middle of the "canvas" image context?.clear(centeredImageRect) // draw the image into that rect useImage.draw(in: centeredImageRect) // get the new "image in the center of a canvas image" let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return image! }
func imageWithColor(color : UIColor,oriImage:UIImage) -> UIImage{ let length = max(oriImage.size.width, oriImage.size.height) let size = CGSize.init(width: length, height: length) let imgView = UIImageView.init(image: oriImage) imgView.contentMode = UIView.ContentMode.scaleAspectFit imgView.backgroundColor = color imgView.bounds = CGRect.init(x: 0, y: 0, width: length, height: length) print("\(size.width)" + "\(size.height)") UIGraphicsBeginImageContext(size) guard let context = UIGraphicsGetCurrentContext() else{ print("context get Error") return oriImage } imgView.layer.render(in:context) let desImg = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return desImg ?? oriImage }
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/70982018
复制相关文章
相似问题
腾讯云开发者
