调整透明图像(UIImage)的大小而不获取黑色背景

func resizeTransparentImage(image: UIImage, targetSize: CGSize) -> UIImage? {
    let imageSize = image.size
    let alphaInfo = image.cgImage?.alphaInfo
    
    UIGraphicsBeginImageContextWithOptions(targetSize, alphaInfo != .none ? false : true, image.scale)
    
    image.draw(in: CGRect(origin: .zero, size: targetSize))
    
    let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    
    return resizedImage
}

let originalImage = UIImage(named: "originalImage.png")
let targetSize = CGSize(width: 200, height: 200)

if let resizedImage = resizeTransparentImage(image: originalImage, targetSize: targetSize) {
    // 使用调整后的图像
} else {
    // 调整图像失败
}