【问题标题】：UIDocumentInteractionController Open Menu Cancelled CallbackUIDocumentInteractionController 打开菜单取消回调
【发布时间】：2014-03-05 14:37:19
【问题描述】：

我目前正在开发一个专门针对 iOS7 的应用程序，该应用程序利用在菜单中打开的 UIDocumentInteractionController 并且需要一种方法来在用户取消且未选择可用选项时通知我。

UIDocumentInteractionControllerDelegate 提供：

- (void)documentInteractionControllerDidDismissOptionsMenu:(UIDocumentInteractionController *) controller

但这并没有指定用户是点击了可用选项之一还是取消。

有什么想法吗？

【问题讨论】：

标签： ios cocoa-touch ios7 uidocumentinteraction

【解决方案1】：

注意：这将不再适用于 iOS 8，仅适用于 iOS7 及更早版本

要确定用户是否取消了菜单或选择了选项，您必须使用以下委托方法：

- (void)documentInteractionController:(UIDocumentInteractionController *)controller
           didEndSendingToApplication:(NSString *)application
{
    //get called only when the user selected an option and then the delegate method bellow get called
    // Set flag here _isOptionSelected = YES;
    _isOptionSelected = YES;
}

- (void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller
{
    //called whether the user has selected option or not
    // check your flag here 
    if(_isOptionSelected == NO) {
        //the user has canceled the menu
     }
    _isOptionSelected = NO;
}

iOS 8

对于 iOS 8 及更高版本，请使用此方法代替第 2 步中的方法：

- (void)documentInteractionController:(UIDocumentInteractionController *)controller
           didEndSendingToApplication:(NSString *)application

【讨论】：

这不起作用，DidDismissOpenInMenu 在 DidEndSendingToApplication 之前被调用。您需要改用WillBeginSendingToApplication。
lukech 是对的。尽管有多次投票和赏金，但这个答案是正确的，但有缺陷。我认为 Basheer_CAD 有答案，但帖子有错字。您需要检查 WillBegin... 而不是 DidEnd... 以确定用户是否选择了应用程序。
谢谢@BuvinJ，请编辑答案我会批准您的编辑，谢谢
我提供了一个编辑。我尽量不要改变太多！它与我现在用于 iOS 5 到 8 的类似。
我认为我的编辑被拒绝了，因为它们正在消失。我不知道那是怎么回事。我没有收到任何直接通知。

【解决方案2】：

这将适用于 iOS7 && iOS8

BOOL didSelectOptionFromDocumentController = NO;//**set this to "NO" every time you present your documentInteractionController too

-(void)documentInteractionController:(UIDocumentInteractionController *)controller willBeginSendingToApplication:(NSString *)application {
    didSelectOptionFromDocumentController = YES;
}


-(void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller {
    if (didSelectOptionFromDocumentController == NO) {//user cancelled.
        
    }
}

【讨论】：

【解决方案3】：

这适用于 iOS8 和 iOS9 的 3rd 方应用程序和系统应用程序！

它不漂亮，但它有效。

谁能告诉我这是否会通过 App Review？不确定，因为我指的是不可公开访问的类名（_UIDocumentActivityViewController）。这是 Swift 2.2！

NSObject Extension 获取类名字符串：

extension NSObject {
    var theClassName: String {
        return NSStringFromClass(self.dynamicType)
    }
}

您从中调用 UIDocumentInteractionController 的 Viewcontroller：

var appOpened = false
var presentedVCMonitoringTimer: NSTimer!
var docController: UIDocumentInteractionController!

func openDocController() {
    docController = UIDocumentInteractionController(URL: yourURL!)
    docController.UTI = "your.UTI"
    docController.delegate = self
    docController.presentOptionsMenuFromRect(CGRectZero, inView: self.view, animated: true)

    // Check the class of the presentedViewController every 2 seconds
    presentedVCMonitoringTimer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: #selector(self.checkPresentedVC), userInfo: nil, repeats: true)
}

func checkPresentedVC() {
    if let navVC = UIApplication.sharedApplication().keyWindow?.rootViewController as? UINavigationController {
        print(navVC.presentedViewController?.theClassName)
        if navVC.presentedViewController != nil && (navVC.presentedViewController?.theClassName)! != "_UIDocumentActivityViewController" && (navVC.presentedViewController?.theClassName)! != self.theClassName {
            // A system App was chosen from the 'Open In' dialog
            // The presented ViewController is not the DocumentInteractionController (anymore) and it's not this viewcontroller anymore (could be for example the MFMailComposeViewController if the user chose the mail app)
            appOpened = true
            presentedVCMonitoringTimer?.invalidate()
            presentedVCMonitoringTimer = nil
        }
    }
}

func documentInteractionControllerDidDismissOptionsMenu(controller: UIDocumentInteractionController) {
    print("dismissedOptionsMenu")
    presentedVCMonitoringTimer?.invalidate()
    presentedVCMonitoringTimer = nil
    if appOpened {
        // Do your thing. The cancel button was not pressed
        appOpened = false
    }
    else {
        // Do your thing. The cancel button was pressed
    }
}

func documentInteractionController(controller: UIDocumentInteractionController, willBeginSendingToApplication application: String?) {
    // A third party app was chosen from the 'Open In' menu.
    appOpened = true
    presentedVCMonitoringTimer?.invalidate()
    presentedVCMonitoringTimer = nil
}

【讨论】：

【解决方案4】：

对于 Swift 4，使用这个：

 func documentInteractionControllerDidDismissOpenInMenu(_ controller: UIDocumentInteractionController) {

        // this function get called when users finish their work, 
        // either for sharing thing within the same app or exit to other app will do
 }

当用户将图片分享到 Facebook 和 Instagram 后，我会使用它。

【讨论】：