旋转UIImageView并使纵横比适当更新

import UIKit

func rotateAndResizeImageView(imageView: UIImageView, angle: CGFloat) {
    // 旋转UIImageView
    imageView.transform = CGAffineTransform(rotationAngle: angle)
    
    // 计算旋转后的图片框架大小
    let rotatedFrame = CGRect(origin: imageView.frame.origin, size: imageView.image!.size)
        .applying(CGAffineTransform(rotationAngle: angle))
    
    // 更新UIImageView的大小
    imageView.frame = CGRect(x: imageView.frame.origin.x, y: imageView.frame.origin.y, width: rotatedFrame.width, height: rotatedFrame.height)
}

// 创建UIImageView对象
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))

// 加载要显示的图片
let image = UIImage(named: "example.jpg")
imageView.image = image

// 旋转UIImageView并使纵横比适当更新
let rotationAngle: CGFloat = CGFloat.pi / 4 // 旋转45度
rotateAndResizeImageView(imageView: imageView, angle: rotationAngle)

// 将UIImageView添加到视图层次结构中
view.addSubview(imageView)