95 lines
3.5 KiB
Swift
95 lines
3.5 KiB
Swift
//
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// ZZHImageExtension.swift
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// SwiftProject
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//
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// Created by aaa on 2024/3/15.
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//
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import Foundation
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import UIKit
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import CoreImage
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let EXImageContext = CIContext()
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extension UIImage {
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func imageAtRect(rect: CGRect) -> UIImage? {
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// 确保CGRect在图片范围内
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guard let cgImage = self.cgImage else {
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guard let ciImage = self.ciImage else {
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return nil
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}
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// 将CIImage转换为CGImage
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let imageRef = ciImage.cropped(to: rect)
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//此处根据文档说明要求,必须转换坐标才能正常展示
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let final = EXImageContext.createCGImage(imageRef, from:imageRef.extent)
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return UIImage(cgImage: final!)
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}
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// print("cgimage.....>>>>>>>>>>>>>.")
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let imageRef = cgImage.cropping(to: rect)
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return imageRef == nil ? nil : UIImage(cgImage: imageRef!)
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}
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// func rotate( radians: CGFloat) -> UIImage? {
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// // 计算旋转角度对应的弧度
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// let radians = radians * CGFloat.pi / 180
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// // 创建一个2D转换
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// var transform = CGAffineTransform(rotationAngle: radians)
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// // 计算变换后的图片大小
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// let rotatedViewBox = UIView(frame: CGRect(origin: .zero, size: self.size))
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// rotatedViewBox.transform = transform
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// let rotatedSize = rotatedViewBox.frame.size
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// // 开始图形上下文
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// UIGraphicsBeginImageContextWithOptions(rotatedSize, false, 1.0)
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// defer { UIGraphicsEndImageContext() }
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// // 创建一个相同大小的视图，并应用变换
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// let rotatedView = UIView(frame: CGRect(origin: .zero, size: rotatedSize))
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// rotatedView.transform = transform
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// // 将image绘制到上下文
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// self.draw(in: rotatedView.frame)
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// // 从上下文获取新图片
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// return UIGraphicsGetImageFromCurrentImageContext()
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// }
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//
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//
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func rotate(radians: CGFloat) -> UIImage {
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let rotatedSize = CGRect(origin: .zero, size: size)
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.applying(CGAffineTransform(rotationAngle: CGFloat(radians)))
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.integral.size
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UIGraphicsBeginImageContext(rotatedSize)
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if let context = UIGraphicsGetCurrentContext() {
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let origin = CGPoint(x: rotatedSize.width / 2.0,
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y: rotatedSize.height / 2.0)
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context.translateBy(x: origin.x, y: origin.y)
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context.rotate(by: radians)
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draw(in: CGRect(x: -origin.y, y: -origin.x,
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width: size.width, height: size.height))
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let rotatedImage = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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return rotatedImage ?? self
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}
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return self
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}
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//返回正向图片
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func getUpImg(imgOrigOritentation:UIImage.Orientation)->UIImage {
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let dg = getRotateFrom(imgOrigOritentation)
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let rotatedImage = rotate(radians:dg)
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return rotatedImage
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}
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func getRotateFrom(_ imgOrigOritentation:UIImage.Orientation) ->CGFloat {
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// print("..or:\(imgOrigOritentation.rawValue)")
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if imgOrigOritentation == .left {
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return -.pi/2
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} else if imgOrigOritentation == .right{
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return .pi/2
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}
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else {//对于down、up的暂时不用管，因为空间照片要求横着拍，所以这里就先随便写一个方向，待后面需要时再做调整
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return .pi
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}
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}
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}
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