我想知道如何与iOS中的其他应用共享，从而开始了我的搜索工作。我发现两种重要的方法是

• UIActivityViewController
• UIDocumentInteractionController

这些方法和其他方法在此SO答案中进行比较。

通常，当我学习一个新概念时，我喜欢看一个入门的基本示例。一旦完成基本设置，以后就可以修改它了。

有许多与相关的问题UIActivityViewController，但我找不到任何仅要求一个简单示例的问题。由于我刚刚学习了如何执行此操作，因此我将在下面提供自己的答案。随时添加一个更好的版本（或Objective-C版本）。

UIActivityViewController示例项目

用两个按钮设置情节提要，然后将其连接到视图控制器（请参见下面的代码）。

将图像添加到Assets.xcassets。我称我为“狮子”。

码

import UIKit
class ViewController: UIViewController {

    // share text
    @IBAction func shareTextButton(_ sender: UIButton) {

        // text to share
        let text = "This is some text that I want to share."

        // set up activity view controller
        let textToShare = [ text ]
        let activityViewController = UIActivityViewController(activityItems: textToShare, applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash

        // exclude some activity types from the list (optional)
        activityViewController.excludedActivityTypes = [ UIActivityType.airDrop, UIActivityType.postToFacebook ]

        // present the view controller
        self.present(activityViewController, animated: true, completion: nil)

    }

    // share image
    @IBAction func shareImageButton(_ sender: UIButton) {

        // image to share
        let image = UIImage(named: "Image")

        // set up activity view controller
        let imageToShare = [ image! ]
        let activityViewController = UIActivityViewController(activityItems: imageToShare, applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash

        // exclude some activity types from the list (optional)
        activityViewController.excludedActivityTypes = [ UIActivityType.airDrop, UIActivityType.postToFacebook ]

        // present the view controller
        self.present(activityViewController, animated: true, completion: nil)
    }

}

结果

单击“共享一些文本”在左侧提供结果，然后单击“共享图像”在右侧提供结果。

笔记

• 我在iOS 11和Swift 4上进行了重新测试。由于超时，我不得不在模拟器中运行了几次。这可能是因为我的计算机运行缓慢。
• 如果您希望隐藏其中的一些选择，则可以使用excludedActivityTypes上面的代码中所示的方法。
• popoverPresentationController?.sourceView在iPad上运行时，不包括该行将导致您的应用程序崩溃。
• 这不允许您与其他应用程序共享文本或图像。您可能想要UIDocumentInteractionController。

也可以看看

• 通过UIActivityViewController将共享添加到您的Swift应用程序
• NSHipster的UIActivityViewController
• UIActivityViewController 文件资料
• 共享扩展文档
• 与...比较 UIDocumentInteractionController

分享：文字

@IBAction func shareOnlyText(_ sender: UIButton) {
    let text = "This is the text....."
    let textShare = [ text ]
    let activityViewController = UIActivityViewController(activityItems: textShare , applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view 
    self.present(activityViewController, animated: true, completion: nil)
}
}

分享：图片

@IBAction func shareOnlyImage(_ sender: UIButton) {
    let image = UIImage(named: "Product")
    let imageShare = [ image! ]
    let activityViewController = UIActivityViewController(activityItems: imageShare , applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view 
    self.present(activityViewController, animated: true, completion: nil)
 }

分享：文字-图片-URL

   @IBAction func shareAll(_ sender: UIButton) {
    let text = "This is the text...."
    let image = UIImage(named: "Product")
    let myWebsite = NSURL(string:"https://stackoverflow.com/users/4600136/mr-javed-multani?tab=profile")
    let shareAll= [text , image! , myWebsite]
    let activityViewController = UIActivityViewController(activityItems: shareAll, applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view 
    self.present(activityViewController, animated: true, completion: nil)
   }

如果您想共享整个屏幕，我发现它可以完美地工作。

@IBAction func shareButton(_ sender: Any) {

    let bounds = UIScreen.main.bounds
    UIGraphicsBeginImageContextWithOptions(bounds.size, true, 0.0)
    self.view.drawHierarchy(in: bounds, afterScreenUpdates: false)
    let img = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    let activityViewController = UIActivityViewController(activityItems: [img!], applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view
    self.present(activityViewController, animated: true, completion: nil)
}

请注意，您也可以将其用于iPad：

activityViewController.popoverPresentationController?.sourceView = sender

因此，弹出窗口会从发送方弹出（在这种情况下为按钮）。

您可以使用我在项目的一个帮助器类中编写的以下函数。

只是打电话

showShareActivity(msg:"message", image: nil, url: nil, sourceRect: nil) 

它将同时适用于iPhone和iPad。如果您通过sourceRect传递任何视图的CGRect值，它还将在iPad中显示一个小箭头。

func topViewController()-> UIViewController{
    var topViewController:UIViewController = UIApplication.shared.keyWindow!.rootViewController!

    while ((topViewController.presentedViewController) != nil) {
        topViewController = topViewController.presentedViewController!;
    }

    return topViewController
}

func showShareActivity(msg:String?, image:UIImage?, url:String?, sourceRect:CGRect?){
    var objectsToShare = [AnyObject]()

    if let url = url {
        objectsToShare = [url as AnyObject]
    }

    if let image = image {
        objectsToShare = [image as AnyObject]
    }

    if let msg = msg {
        objectsToShare = [msg as AnyObject]
    }

    let activityVC = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
    activityVC.modalPresentationStyle = .popover
    activityVC.popoverPresentationController?.sourceView = topViewController().view
    if let sourceRect = sourceRect {
        activityVC.popoverPresentationController?.sourceRect = sourceRect
    }

    topViewController().present(activityVC, animated: true, completion: nil)
}

我使用了上面的实现，现在我才知道它在运行iOS 13的iPad上不起作用。为了使它正常工作，我不得不在present（）调用之前添加这些行。

//avoiding to crash on iPad
if let popoverController = activityViewController.popoverPresentationController {
     popoverController.sourceRect = CGRect(x: UIScreen.main.bounds.width / 2, y: UIScreen.main.bounds.height / 2, width: 0, height: 0)
     popoverController.sourceView = self.view
     popoverController.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
}

这就是对我有用的方式

func shareData(_ dataToShare: [Any]){

        let activityViewController = UIActivityViewController(activityItems: dataToShare, applicationActivities: nil)

        //exclude some activity types from the list (optional)
        //activityViewController.excludedActivityTypes = [
            //UIActivity.ActivityType.postToFacebook
        //]

        //avoiding to crash on iPad
        if let popoverController = activityViewController.popoverPresentationController {
            popoverController.sourceRect = CGRect(x: UIScreen.main.bounds.width / 2, y: UIScreen.main.bounds.height / 2, width: 0, height: 0)
            popoverController.sourceView = self.view
            popoverController.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
        }

        self.present(activityViewController, animated: true, completion: nil)
    }