UIActivityViewController - 仅附加某些活动的URL [英] UIActivityViewController - Only attach a URL for certain activities

问题描述

我一直在尝试使用新的UIActivityViewController来替换我的所有UIActionSheets以进行共享，但是我遇到了一个问题。

I've been trying to use the new UIActivityViewController to replace all of my UIActionSheets for sharing, however I've run into an issue.

我有5项活动，消息，电子邮件，复制，推特和Facebook。我已经想出如何在自定义的UIActivityProvider子类中显示不同的文本：

I have 5 activities, Message, Email, Copy, Twitter, and Facebook. I've already figured out how to have those show different text, through this in a custom UIActivityProvider subclass:

- (id) activityViewController:(UIActivityViewController *)activityViewController
      itemForActivityType:(NSString *)activityType
{
    if ( [activityType isEqualToString:UIActivityTypePostToTwitter] )
        return twitter;
    if ( [activityType isEqualToString:UIActivityTypePostToFacebook] )
        return facebook;
    if ( [activityType isEqualToString:UIActivityTypeMessage] )
        return urlScheme;
    if ( [activityType isEqualToString:UIActivityTypeMail] )
        return urlScheme;
    if ( [activityType isEqualToString:UIActivityTypeCopyToPasteboard])
        return urlScheme;
    return nil;
}

这在我的视图控制器中：

And this in my view controller:

    ActivityProvider *aProvider = [[ActivityProvider alloc] init];
    aProvider.facebook = facebook;
    aProvider.twitter = twitter;
    aProvider.urlScheme = URL;

    NSArray *Items = @[aProvider, sharedURL];

    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:Items applicationActivities:Nil];
    activityVC.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll, UIActivityTypePostToWeibo];


    [self presentViewController:activityVC animated:TRUE completion:nil];

但是，我只想在Facebook和Twitter共享表中显示URL（sharedURL），而不是消息，电子邮件或副本。有什么方法可以实现这个目标吗？

However, I only want to show the URL (sharedURL) in the Facebook and Twitter share sheets, not the message, email or copy. Any way to accomplish this?

推荐答案

您可以选择发送给每种活动的内容。我创建了一个自定义活动提供程序并将其调用如下：

You can choose what to send to each type of activity. I created a custom activity provider and call it like this:

     NSMutableArray *activityItems = [NSMutableArray array];

     CustomActivityItemProvider *activityItemProvider =
     [[CustomActivityItemProvider alloc] initWithText:text
                                                     urlText:urlString];

     [activityItems addObject:activityItemProvider];


     //you can have your own custom activities too:
     NSArray *applicationActivities = @[[CustomActivity new],
                                              [OtherCustomActivity new]];
     UIActivityViewController *vc = [[UIActivityViewController alloc]initWithActivityItems:activityItems
                                                                     applicationActivities:applicationActivities];

自定义提供者是UIActivityItemProvider的子类

The custom provider is a subclass of UIActivityItemProvider

@interface CustomActivityItemProvider : UIActivityItemProvider

- (id)initWithText:(NSString *)text urlText:(NSString *)url;

@end

我的自定义提供程序类的内容看起来像这样：

The guts of my custom provider class look something like this:

- (id)initWithText:(NSString *)text urlText:(NSString *)url{

    if ((self = [super initWithPlaceholderItem:text])) {       
        self.text = text ?: @"";
        self.url = url ?: @"";
    }   
    return self;
}

- (id)item {   
    NSString *activityType = self.activityType;
    if ([self.placeholderItem isKindOfClass:[NSString class]]) {            
        if ([self.activityType isEqualToString:UIActivityTypePostToFacebook] ||
            [self.activityType isEqualToString:UIActivityTypeMail]) {

            return [NSString stringWithFormat:@"%@\n%@", self.text, self.url];

        } else if ([activityType isEqualToString:UIActivityTypePostToTwitter]) {

            return [self findBestStringOfLength:kTwitterMessageLength hashTags:YES];

        } else if ([activityType isEqualToString:UIActivityTypeMessage]) {

            return [self findBestStringOfLength:kSMSMessageLength hashTags:YES];

        } else {
            return self.text;
        }
    }

    return self.placeholderItem;
}

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