背景
下面代码中的函数 shareImage()
启动 UIActivityViewController
并共享图像,例如发送到消息或保存到照片。
图片分享后,UIActivityViewController
结束,调用completionWithItemsHandler
函数activityComplete()
。
代码在 iOS/iPadOS/MacOS 上运行良好,如预期的那样并共享图像,除了在 MacOS 上,completionWithItemsHandler
函数 activityComplete()
从不被调用,使用标志 print("Share complete.")
确认。
Xcode 改为记录以下输出:
场景销毁请求失败,出现错误:(null)
问题
是什么导致了阻止 completionWithItemsHandler
函数 activityComplete()
在 MacOS 上被调用的问题,如何在代码中更正这个问题?
代码
注意:更新后根据答案添加了两行。
import UIKit
class ViewController: UIViewController {
var shareButton = UIButton(type: UIButton.ButtonType.custom)
var activityImage: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
// Create share button
shareButton.setTitle("Share", for:UIControl.State())
shareButton.setTitleColor(.white, for: UIControl.State())
shareButton.backgroundColor = .purple
shareButton.frame = CGRect(x: 50, y: 100, width: 200, height: 200)
shareButton.addTarget(self, action: #selector(ViewController.shareImage), for:.touchUpInside)
view.addSubview(shareButton)
}
private var activity: UIActivityViewController? // <-- Added
@objc func shareImage() {
// Take view screenshot
UIGraphicsBeginImageContextWithOptions(self.view.frame.size, false, 0)
self.view.drawHierarchy(in: CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height), afterScreenUpdates: false)
activityImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
// Share view screenshot
let activity = UIActivityViewController(activityItems: [activityImage as Any], applicationActivities: nil)
// Present iPhone share options
if UIDevice.current.userInterfaceIdiom == .phone {
self.present(activity, animated: true, completion: nil)
}
// Present iPad share options
if UIDevice.current.userInterfaceIdiom == .pad {
self.present(activity, animated: true, completion: nil)
if let popOver = activity.popoverPresentationController {
popOver.sourceView = self.shareButton
}
}
// Complete share
activity.completionWithItemsHandler = {activity, success, items, error in
self.activityComplete()
}
self.activity = activity // <-- Added
}
func activityComplete() {
print("Share complete.")
}
}
最佳答案
尝试在呈现后保留您的事件 View Controller 。 像这样的东西:
private var activityViewController: UIActivityViewController?
@objc func presentActivityViewController(activityItems: [Any]) {
let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
self.present(activityViewController, animated: true, completion: nil)
activityViewController.completionWithItemsHandler = { activity, success, items, error in
// some logic
}
self.activityViewController = activityViewController // <- retaining activityViewController
}
关于ios - UIActivityViewController completionWithItemsHandler 函数未在 MacOS 应用程序中调用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/69367599/