Swift，共享扩展: NSItemProvider loadItem不工作

Question

我有一个分享扩展，允许用户添加图片到应用程序，

一切都很好，但NSItemProvider .loadItem不工作

这是我在SLComposeServiceViewController中的代码：

override func viewDidLoad() {

    let content = extensionContext!.inputItems[0] as! NSExtensionItem

    for attachment in content.attachments as! [NSItemProvider] {

        let identifier = kUTTypeJPEG as String
        let hasItemConforming =  attachment.hasItemConformingToTypeIdentifier(identifier)

        print("LOG : \(hasItemConforming)") // print True ! so item has conforming

        if hasItemConforming {

            attachment.loadItem(forTypeIdentifier: identifier , options: nil, completionHandler: { (coding:NSSecureCoding?, error:Error!) in

                // this func not works and prints nothing

                print("LOG : Loaded") // print nothing
                print("LOG : error : \(error)") // print nothing
                print("LOG : secureCoding : \(coding == nil)") // print nothing

            })
        }

    }

    self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
}

Answer 1

地点

self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil) 

在attachment.loadItem()而不是viewDidLoad()的completionHandler末尾，如下所示：

attachment.loadItem(forTypeIdentifier: identifier , options: nil, completionHandler: {
    data, error in
    // Your code here

    self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil) 
})