将图像从 URL 保存到图库，重命名并使用 Swift 共享

Question

我想从我自己的 iOS 应用程序将图像分享到 Instagram，我在整个项目中使用 Kingfisher 下载和缓存图像并在 UIImageViews 中显示它们，但这次我想做一些事情不同的。

基本上，我从 API 那里收到带有图像 url 的响应，我想

使用URL

objective-C 使用

有一堆关于此的问题

 UIImageWriteToSavedPhotosAlbum

但我正在使用 Swift。

重命名为 .igo 扩展名（instagram 独有）

不确定该怎么做，这取决于数字 1。

然后我可以像

那样分享它

        let image = UIImage(named: "downloadedImage")
        let objectsToShare: [AnyObject] = [ image! ]
        let activityViewController = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view


        activityViewController.excludedActivityTypes = [ UIActivityTypeAirDrop, UIActivityTypePostToFacebook ]


        self.presentViewController(activityViewController, animated: true, completion: nil)

或者我可以使用 Instagram 挂钩：

 instagram://library?LocalIdentifier=\(localID)

专门针对 Swift 的相关文档很少。我该怎么做？我只需要朝着正确的方向推动。

Answer 1

在我的导航控制器中，我将 UIBarButtonItem 设置为系统项 "Action"。然后我创建了以下 IBAction 代码：

@IBAction func shareImage(_ sender: UIBarButtonItem) {
    let context = CIContext()
    let final = context.createCGImage(imgFinished, from: imgFinished.extent)
    let shareImage = UIImage(cgImage: final!)
    let vc = UIActivityViewController(activityItems: [shareImage], applicationActivities: [])
    vc.excludedActivityTypes =  [
        UIActivityType.airDrop,
        UIActivityType.assignToContact,
        UIActivityType.addToReadingList,
        //UIActivityType.copyToPasteboard,
        //UIActivityType.mail,
        //UIActivityType.message,
        //UIActivityType.openInIBooks,
        //UIActivityType.postToFacebook,
        //UIActivityType.postToFlickr,
        UIActivityType.postToTencentWeibo,
        //UIActivityType.postToTwitter,
        UIActivityType.postToVimeo,
        UIActivityType.postToWeibo,
        UIActivityType.print,
        //UIActivityType.saveToCameraRoll
    ]
    present(vc,
            animated: true,
            completion: nil)
    vc.popoverPresentationController?.sourceView = self.view
    vc.completionWithItemsHandler = {(activity, success, items, error) in
    }
}

excludedActivityTypes 列表是 complete/exhaustive 可用 UIActivityTypes 列表，从 code-complete 或 command-clicking 收集 UIActivity 类型并遍历生成的结构。我取消注释那些我希望排除的内容 - 但将它们保留下来以供将来快速参考。这将为您提供所需的弹出窗口。

Answer 2

听起来您已经知道如何使用 Kingfisher 并从 URL 中检索 UIImage。所以我要提供的是将图像保存到文档目录并检索它以共享的信息。

检索正确的目录URL

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    let documentsDirectory = paths[0]
    return documentsDirectory
}

正在将图像保存到该目录

func saveImage (image: UIImage, filename: String ){
    print("Saving image with name \(filename)")
    if let data = UIImagePNGRepresentation(image) {
        let fullURL = getDocumentsDirectory().appendingPathComponent(filename)
        try? data.write(to: fullURL)
    }
}

正在从目录中检索图像

func loadImageFromName(name: String) -> UIImage? {
    print("Loading image with name \(name)")
    let path = getDocumentsDirectory().appendingPathComponent(name).path

    let image = UIImage(contentsOfFile: path)

    if image == nil {

        print("missing image at: \(path)")
    }
    return image
}

分享图片

func share(shareText shareText:String?,shareImage:UIImage?){
   var objectsToShare = [AnyObject]()
   if let shareTextObj = shareText{
      objectsToShare.append(shareTextObj)
   }
   if let shareImageObj = shareImage{
      objectsToShare.append(shareImageObj)
   }

   if shareText != nil || shareImage != nil{
      let activityViewController = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
      activityViewController.popoverPresentationController?.sourceView = self.view

      present(activityViewController, animated: true, completion: nil)
   }else{
     print("There is nothing to share")
   }
}

如何使用

let img: UIImage = UIImage() // Replace this with your image from your URL
saveImage(image: img, filename: "newImage.igo") //This is where you change your extension name

let newImage: UIImage = loadImageFromName(name: "newImage.igo") //Retrieve your image with the correct extension

share(shareText: "Image going to Instagram", shareImage: newImage) //Present Activity VC.

正如 DFD 指出的那样，您可以从共享中排除某些项目 VC 以仅允许您需要的内容。

将图像从 URL 保存到图库，重命名并使用 Swift 共享

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