如果用户按下取消，UIActivityViewController 完成处理程序仍会调用操作
Posted
技术标签:
【中文标题】如果用户按下取消，UIActivityViewController 完成处理程序仍会调用操作【英文标题】：UIActivityViewController completion handler still calls action if user presses cancel 【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：/ 【参考方案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【参考方案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】：
【参考方案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】：
【参考方案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】：
【参考方案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。【参考方案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】：
【参考方案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://***.com/a/34581940/1109892
【讨论】：
【参考方案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】：
以上是关于如果用户按下取消，UIActivityViewController 完成处理程序仍会调用操作的主要内容，如果未能解决你的问题，请参考以下文章