UIActivityViewController 只为 FB、Twitter 和 Mail 共享图像，但不共享消息

Question

所以我使用以下代码获取所有 UIActivityType 的文本。

        @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }

    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
        if activityType == UIActivityTypeMessage {
            return "String for message"
        } else if activityType == UIActivityTypeMail {
            return "String for mail"
        } else if activityType == UIActivityTypePostToTwitter {
            return "String for twitter"
        } else if activityType == UIActivityTypePostToFacebook {
            return "String for facebook"
        }
        return nil
    }

    func activityViewController(activityViewController: UIActivityViewController, subjectForActivityType activityType: String?) -> String {
        if activityType == UIActivityTypeMessage {
            return "Subject for message"
        } else if activityType == UIActivityTypeMail {
            return "Subject for mail"
        } else if activityType == UIActivityTypePostToTwitter {
            return "Subject for twitter"
        } else if activityType == UIActivityTypePostToFacebook {
            return "Subject for facebook"
        }
        return ""
    }   
}

这就是有趣的部分发生的地方。我将 URL 中的图像添加到 objectsToShare 数组。如果我想为所有人显示图像，这会很好用，但我的问题是我不想显示 UIActivityTypeMessage 的图像。那个应该只包含文本，没有图像。我该怎么做？

    // Load image to share
let articleURL = URLBuilder.sharedInstance.addOnlyHttps((promo?.imageUrl)!)
KingfisherManager.sharedManager.cache.retrieveImageForKey(articleURL, options: nil) { (image, _) -> () in
    if image != nil {
        objectsToShare.append(image!)
        self.openShareViewController(objectsToShare, sender: sender )
    } else {
        KingfisherManager.sharedManager.downloader.downloadImageWithURL(NSURL(string: articleURL)!, progressBlock: nil, completionHandler: { (image, error, imageURL, originalData) in
            if image != nil {
                KingfisherManager.sharedManager.cache.storeImage(image!, forKey: articleURL)
                objectsToShare.append(image!)
                self.openShareViewController(objectsToShare, sender: sender)
            }
        })

    }
}

Answer 1

要为不同的 ActivityItem 设置不同的内容，最好的方法是使用 UIActivityItemSource。有关 ActivityItemSource 的更多信息，请查看此 Documentation。
您已经按照相同的方式进行操作，因此很容易找到解决问题的方法。

如下创建两个 UIActivityItemSource class

SourceOne:

class MyStringItemSourceOne: NSObject, UIActivityItemSource {
@objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
   return ""
}

@objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {

   if activityType == UIActivityTypeMessage {
     return "String for message"
   } else if activityType == UIActivityTypeMail {
    return "String for mail"
   } else if activityType == UIActivityTypePostToTwitter {
    return "String for twitter"
   } else if activityType == UIActivityTypePostToFacebook {
    return "String for facebook"
   }
   return nil
   }
}

通过添加上面的代码，我们将 String Content 设置为 shared.Note 取决于 activity activityType我们设置不同的字符串值。

我们的要求是为所有 activityType expect UIActivityTypeMessage设置图像，这样我们就可以创建另一个 UIActivityItemSource

SourceTwo

 class MyStringItemSourceTwo: NSObject, UIActivityItemSource {
 @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
    return ""
  } 

 @objc func activityViewController(activityViewController:  UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {

    let Image: UIImage = UIImage(data: NSData(contentsOfURL: NSURL(string: "http://i.telegraph.co.uk/multimedia/archive/03589/Wellcome_Image_Awa_3589699k.jpg")!)!)!
    if activityType == UIActivityTypeMessage {
       return nil
    } else if activityType == UIActivityTypeMail {
    //return "String for mail"
       return Image
    } else if activityType == UIActivityTypePostToTwitter {
       return Image
    } else if activityType == UIActivityTypePostToFacebook {
       return Image
    }
    return nil
   }

}

接下来将上面两个source的添加到UIActivityViewController中作为activityitems如下

@IBAction func Test(sender: AnyObject) {

   let activityVC = UIActivityViewController(activityItems: [MyStringItemSourceOne(),MyStringItemSourceTwo()] as [AnyObject], applicationActivities: nil)
   //NOTE: Instead of using rootviewcontroller go with your own way.
   if let window = (UIApplication.sharedApplication().delegate as? AppDelegate)?.window
   {
      window.rootViewController?.presentViewController(activityVC, animated: true, completion: nil)
   }
}

现在一切都会按照您的要求正常工作了。

UIActivityViewController 只为 FB、Twitter 和 Mail 共享图像，但不共享消息

UIActivityViewController share image only for FB, Twitter and Mail, but not messages

facebook

uiactivityviewcontroller

swift