UIActivityViewControllerCompletionHandler How to?

Question

我正在尝试使用UIActivityViewControllerCompletionHandler，但我不太明白如何。

我想检测用户何时完成或关闭此视图控制器 （ UIActivityViewController ）。

有人知道怎么做吗？

Answer 1

下面介绍如何显示共享对话框并设置其完成处理程序

NSArray *imageArray = [NSArray arrayWithObject:shareImage];
UIActivityViewController *sharing = [[UIActivityViewController alloc] initWithActivityItems:imageArray applicationActivities:nil];
[sharing setCompletionHandler:^(NSString *activityType, BOOL completed) {
    NSLog(@"completed dialog - activity: %@ - finished flag: %d", activityType, completed);
}];
[self presentViewController:sharing animated:YES completion:nil];

Answer 2

在 iOS 8 中，completionHandler 已被弃用，因此您需要提供替代completionWithItemsHandler。它还允许处理扩展修改您设置的数据（例如照片扩展）。请参阅文档

    UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[text, URL, image] applicationActivities:nil];
    activityViewController.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeAirDrop, UIActivityTypeAddToReadingList];
    // check if new API supported
    if ([activityViewController respondsToSelector:@selector(completionWithItemsHandler)]) {
        activityViewController.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
            // When completed flag is YES, user performed specific activity
        };
    } else {
        activityViewController.completionHandler = ^(NSString *activityType, BOOL completed) {
            // When completed flag is YES, user performed specific activity
        };
    }

Answer 3

typedef void (^UIActivityViewControllerCompletionHandler)
    (NSString *activityType, BOOL completed);

完成处理程序的第二个参数告诉您用户是否关闭了控制器。如果他们关闭控制器，completed将设置为 NO 。

完成处理程序的文档中提供了更多详细信息。

Answer 4

Swift 5：

func showShareOf(url: URL, title: String) {
    let shareItems: [Any] = ["(title)n", url]
    let activityVC = UIActivityViewController(activityItems: shareItems, applicationActivities: nil)
    activityVC.completionWithItemsHandler = doneSharingHandler
    self.present(activityVC, animated: true, completion: nil)
}
@objc func doneSharingHandler(activityType: UIActivity.ActivityType?, completed: Bool, _ returnedItems: [Any]?, error: Error?) {
    if (!completed) { return }
    // If here, log which activity occurred
    print("Shared activity: (activityType)")
}

Answer 5

您可以使用

completionWithItemsHandler

这是Objective-C中的代码。请相应地将其翻译成 Swift。

UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:@[text] applicationActivities:nil];
activityVC.completionWithItemsHandler  = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *error){
          
   if (completed) {
             
        NSLog(@"Shared by activity %@", activityType);
    } else {
        NSLog(@"ShareSheet was closed");
    }
   
    if (error) {
        NSLog(@"An Error Occured: %@, %@", error.localizedDescription, error.localizedFailureReason);
             
    }
};

Answer 6

对于 Swift 来说，这个对我有用......

   配置 UIActivityViewController    let activityViewController = UIAactivityViewController（activityItems： objectsToShare， applicationActivities： nil）    activityViewController.excludedActivityTypes = [UIActivityTypeAirDrop，        UIActivityTypeAddToReadingList，        UIActivityTypeAssignToContact，        UIActivityTypePrint，        UIActivityTypeCopyToPasteboard]    显示 UIActivityViewController    presentViewController（activityViewController， animated： true， complete： nil）    定义完成处理程序    activityViewController.completionWithItemsHandler = doneSharingHandler...func doneSharingHandler（activityType： String！， complete： Bool， returnItems： [AnyObject]！， error： NSError！）{    取消退货    如果 （！已完成） {        返回    }    如果在此处，请记录发生的活动    println（"共享视频活动： \（活动类型）"）}