ios - 在通知附件中使用来自 Assets.xcassets 的图像是否有比这更好的方法？

Question

我想将 Assets.xcassets 中的图像附加到通知中。我一直在寻找解决方案大约一个小时，这似乎是唯一的方法:

func createLocalUrl(forImageNamed name: String) -> URL? {

let fileManager = FileManager.default
let cacheDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask)[0]
let url = cacheDirectory.appendingPathComponent("\(name).png")

guard fileManager.fileExists(atPath: url.path) else {
    guard
        let image = UIImage(named: name),
        let data = UIImagePNGRepresentation(image)
        else { return nil }

    fileManager.createFile(atPath: url.path, contents: data, attributes: nil)
    return url
}

return url
}

来源:Can I get a NSURL from an XCAssets bundle?

这似乎有点矫枉过正。但是据我所知，这是获取您可以使用的 URL 的唯一方法:

let imageURL = createLocalUrl(forImageNamed: "TestImage")

let attachment = try! UNNotificationAttachment(identifier: "image", url: imageURL!, options: [:])
        content.attachments = [attachment]

是否有更好的方法将 Assets.xcassets 中的图像添加到本地通知？ (是的，我知道我可以在 Assets 之外存储图像并使用 Bundle.main.etc)

Answer 1

我知道这是个老问题，但我稍微改进了你的解决方案，也许有人会用它

extension UIImage {
    func createLocalURL() -> URL? {
        guard let imageName = self.accessibilityIdentifier else {
            return nil
        }

        let fileManager = FileManager.default
        guard let cacheDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first else {
            return nil
        }
        let url = cacheDirectory.appendingPathComponent("\(imageName).png")

        guard fileManager.fileExists(atPath: url.path) else {
            guard let data = self.pngData() else { return nil }
            fileManager.createFile(atPath: url.path, contents: data, attributes: nil)
            return url
        }

        return url
    }
}

类里面想用的时候

func createImageAttachment(image: UIImage?) -> [UNNotificationAttachment] {
        var notificationAttachment: [UNNotificationAttachment] = []
        if let image = image,
            let imageUrl = image.createLocalURL(),
            let attachment = try? UNNotificationAttachment(identifier: "image", url: imageUrl, options: nil) {

            notificationAttachment.append(attachment)
        }

        return notificationAttachment
    }

并在通知中添加图片

let image = UIImage(named: "TestImage")
content = createImageAttachment(image: image)

这样比较安全