iOS使用ShareExtension获取分享的图片

一、新建shareExtension

Xcode菜单选择file-new-target，在弹出的地方找到shareExtension并选择，填写好对应的信息后，会生成一个新的target

选择Share Extension 新生成的target概览

生成之后在工程文件中选中新建的extension，在Signing & Capabilities中添加App Groups:

新建的target
App Group

添加一个group-id(主app也需要新建一个app-group，和此处一致):

Group-ID

在info.plist中配置文件接收的类型

info.plist

最后写处理的逻辑

ShareViewController.swift

let APP_GROUP_ID = "之前新建的app-group-id"

override func viewDidLoad() {
    guard let extensionItem = extensionContext?.inputItems[0] as? NSExtensionItem else {
        didSelectPost()
        return
    }
    guard let provider = extensionItem.attachments?.first else {
        didSelectPost()
        return
    }
    if provider.hasItemConformingToTypeIdentifier("public.image"){
        provider.loadItem(forTypeIdentifier: "public.image", options: nil){[weak self] (item,error)  in
            if error != nil{
                print(error!)
            }
            if item is URL{
                self?.imageData = try? Data(contentsOf: item as! URL)
            }else{
                self?.imageData = (item as? UIImage)?.jpegData(compressionQuality: 1.0)
            }
            self?.takeImageToMainApp()
        }
    }else if provider.hasItemConformingToTypeIdentifier("public.url"){
        provider.loadItem(forTypeIdentifier: "public.url", options: nil){[weak self] (item,error)  in
            if error != nil{
                print(error!)
            }
            if let data = try? Data(contentsOf: item as! URL){
                if let _ = UIImage(data: data){
                    self?.imageData = data
                }
            }
            self?.takeImageToMainApp()
        }
    }
}

func takeImageToMainApp(){
    if imageData != nil{
        let defaults = UserDefaults.init(suiteName: APP_GROUP_ID)
        defaults?.setValue(imageData, forKey: "share_image")
        var responder = self.next
        while responder != nil{
            let sel = Selector("openURL:")
            if responder!.responds(to: Selector("openURL:")){
                responder!.perform(sel, with: URL(string:"你的主app配置的一个URLScheme://"))
                break
            }
            responder = responder?.next
        }
    }
    self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
}

二、在主APP处理

AppDelegate.swift

func applicationDidBecomeActive(_ application: UIApplication) {
    //读取shareExtension分享的图片
    let defaults = UserDefaults.init(suiteName: APP_GROUP_ID)
    if let data = defaults?.data(forKey: share_image){
        defaults?.setValue(nil, forKey: share_image)//清空
        if let image = UIImage(data: data){
            //处理图片
        }
    }
}