如果用户按下取消，UIActivityViewController 完成处理程序仍会调用操作答案

【问题标题】：UIActivityViewController completion handler still calls action if user presses cancel如果用户按下取消，UIActivityViewController 完成处理程序仍会调用操作
【发布时间】：2014-02-28 00:42:05
【问题描述】：

在我的 UIActivityViewController 中，我使用完成处理程序来执行“成功共享”通知。它可以工作，但我唯一的问题是，如果用户按下取消，它仍然会显示通知。

这是我的完成处理程序代码，

[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {


    CWStatusBarNotification *notification = [CWStatusBarNotification new];
    [notification displayNotificationWithMessage:@"✓ Successfully Shared Centre!"
                                          forDuration:3.0f];

    notification.notificationLabelBackgroundColor = [UIColor colorWithRed:38.0f/255.0f green:81.0f/255.0f blue:123.0f/255.0f alpha:1.0f];
    notification.notificationLabelTextColor = [UIColor whiteColor];



}];

感谢您的帮助！

【问题讨论】：

建议：不要显示“共享成功”通知。这可能很烦人。
我的设计师想要它，我不同意，但他是负责人：/

标签： ios uiactivityviewcontroller completionhandler

【解决方案1】：

注意：completionHandler 属性在 iOS8 中已被弃用，因此无法再知道共享操作的结果。 https://developer.apple.com/documentation/uikit/uiactivityviewcontroller/1622010-completionhandler

更新：就像 adruzh 说的，在 iOS8 上有一个新的 completionHandler，Apple 忘记在文档中提到了：

[activityController setCompletionWithItemsHandler:
    ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
}];

https://developer.apple.com/documentation/uikit/uiactivityviewcontroller/1622022-completionwithitemshandler

【讨论】：

看起来像文档中的一个错误 - 有一个新的处理程序，它在 UIKit 更改中被引用

【解决方案2】：

这就是 completed 参数的用途：

[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {
    if (!completed) return;

    CWStatusBarNotification *notification = [CWStatusBarNotification new];
    [notification displayNotificationWithMessage:@"✓ Successfully Shared Centre!"
                                     forDuration:3.0f];

    notification.notificationLabelBackgroundColor = [UIColor colorWithRed:38.0f/255.0f green:81.0f/255.0f blue:123.0f/255.0f alpha:1.0f];
    notification.notificationLabelTextColor = [UIColor whiteColor];
}];

【讨论】：

【解决方案3】：

对于 Swift，这对我们有用：

    ...

    // Configure UIActivityViewController
    let activityViewController = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
    activityViewController.excludedActivityTypes = [UIActivityTypeAirDrop,
        UIActivityTypeAddToReadingList,
        UIActivityTypeAssignToContact,
        UIActivityTypePrint,
        UIActivityTypeCopyToPasteboard]

    // Show UIActivityViewController
    presentViewController(activityViewController, animated: true, completion: nil)

    // Define completion handler
    activityViewController.completionWithItemsHandler = doneSharingHandler

    ...

func doneSharingHandler(activityType: String!, completed: Bool, returnedItems: [AnyObject]!, error: NSError!) {
    // Return if cancelled
    if (!completed) {
        return
    }

    // If here, log which activity occurred
    println("Shared video activity: \(activityType)")
}

【讨论】：

【解决方案4】：

Swift 5 - 下面的函数涵盖了大部分 UIActivityViewController 属性。它对我有用，并认为它可能对你们也有帮助。

func performShareAction() {
        let itemsToShare : [Any] = ["Hello World"]
        let activityView = UIActivityViewController(activityItems: itemsToShare, applicationActivities: nil)
        
        // Apps that you want to exclude sharing the items
        let excludedActivityTypes : [UIActivity.ActivityType] = [
            .addToReadingList,
            .assignToContact,
            .copyToPasteboard,
            .mail,
            .markupAsPDF,
            .message,
            .openInIBooks,
            .postToFacebook,
            .postToFlickr,
            .postToTencentWeibo,
            .postToTwitter,
            .postToVimeo,
            .postToWeibo,
            .print,
            .saveToCameraRoll
        ]

        activityView.excludedActivityTypes = excludedActivityTypes
        self.present(activityView, animated: true, completion: nil)
        
        activityView.completionWithItemsHandler = { activityType, completed, items, error in
            
            // Event Cancelled
            if !completed {
                print("Content Sharing was cancelled.")
                return
            }
            
            // Content Shared on particular activity
            print("Shared on activity type: \(String(describing: activityType?.rawValue))")
            
            // Detect app on which the items are shared
            if let type = activityType {
                switch type {
                case .addToReadingList: print("Added To Reading List"); break
                case .airDrop: print("AirDropped to Other Device"); break
                case .assignToContact: print("Assigned To Contact"); break
                case .copyToPasteboard: print("Copied To Pasteboard"); break
                case .mail: print("Mailed"); break
                case .markupAsPDF: print("Marked-Up As PDF"); break
                case .message: print("Messaged"); break
                case .openInIBooks: print("Opened In iBooks"); break
                case .postToFacebook: print("Posted To Facebook"); break
                case .postToFlickr: print("Posted To Flickr"); break
                case .postToTencentWeibo: print("Posted To Tencent Weibo"); break
                case .postToTwitter: print("Posted To Twitter"); break
                case .postToVimeo: print("Posted To Vimeo"); break
                case .postToWeibo: print("Posted To Weibo"); break
                case .print: print("Printed"); break
                case .saveToCameraRoll: print("Saved To Camera Roll"); break
                default: print("Shared with new app"); break
                }
            }
        }
    }

【讨论】：

【解决方案5】：

对于现有的 Swifties，以下是在 Swift 中编写代码以及一些共享服务检测的方法：

activityViewController.completionHandler = {(activityType, completed:Bool) in
    if !completed {
        //cancelled
        return
    }

    //shared successfully

    //below is how you would detect for different sharing services
    var activity:String = "other"
    if activityType == UIActivityTypePostToTwitter {
        activity = "twitter"
    }
    if activityType == UIActivityTypeMail {
        activity = "mail"
    }
    //more code here if you like
}

【讨论】：

completionHandler 在 iOS 8 中已弃用。对于 iOS 8，请使用 completionWithItemsHandler。

【解决方案6】：

completed 参数将是NO 是用户取消。

[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {
    if (completed) {
        CWStatusBarNotification *notification = [CWStatusBarNotification new];
        [notification displayNotificationWithMessage:@"✓ Successfully Shared Centre!"
                                          forDuration:3.0f];

        notification.notificationLabelBackgroundColor = [UIColor colorWithRed:38.0f/255.0f green:81.0f/255.0f blue:123.0f/255.0f alpha:1.0f];
        notification.notificationLabelTextColor = [UIColor whiteColor];
    }
}];

【讨论】：

【解决方案7】：

SWIFT 2.0, iOS 8.0 >，你应该像这样使用完成处理程序：

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

activityVC.completionWithItemsHandler = {(activityType, completed:Bool, returnedItems:[AnyObject]?, error: NSError?) in
     //do some action
}

在这里查看我的答案：https://stackoverflow.com/a/34581940/1109892

【讨论】：

【解决方案8】：

斯威夫特 3

   func completionHandler(activityType: UIActivityType?, shared: Bool, items: [Any]?, error: Error?) {
        if (shared) {
            print("Cool user shared some stuff")
        }
        else {
            print("Bad user canceled sharing :(")
        }
    }

    activityController.completionWithItemsHandler = completionHandler

【讨论】：