使用“UIActivityItemSource”协议无法分享到 Instagram

Question

我使用UIActivityViewController共享文本和图像。 该图像来自一个UIImage() activityImage 。 自定义文本来自从UIActivityItemSource协议返回的activityText() 。

问题是，Instagram 只能在特定条件下在UIActivityViewController可见。

总结以下测试：

• Instagram的是只在可见UIActivityViewController为activityItems: [activityImage]和activityItems: [activityImage, NSNull()]

• 即使返回的UIActivityItemSource协议值为"" 、 nil 、 NSNull() ，Instagram 也会为activityItems: [activityImage, activityText()]隐藏。

问题是需要调用UIActivityItemSource协议，以便可以分别管理不同的共享平台。

---

问题：

• 如何在调用UIActivityItemSource协议时分享到 Instagram？

• 在调用UIActivityItemSource协议时，我可以尝试哪些替代"" 、 nil和NSNull() ？

---

代码：

class activityText: NSObject, UIActivityItemSource {
    @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }
    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
        switch activityType {
        case UIActivityTypeMessage:
            return "Special text when sharing to Messages."
        default:
            return ""
        }
    }
}

func shareEverwhere() {
      var activityImage: UIImage() 
      let activity = UIActivityViewController(activityItems: [activityImage, activityText()], applicationActivities: nil)
      self.presentViewController(activity, animated: true, completion: nil)
}

---

测试：

Instagram 在UIActivityViewController可见

let activity = UIActivityViewController(activityItems: [activityImage], applicationActivities: nil)

或者

let activity = UIActivityViewController(activityItems: [activityImage, NSNull()], applicationActivities: nil)

Instagram隐藏在UIActivityViewController

let activity = UIActivityViewController(activityItems: [activityImage, ""], applicationActivities: nil)

或者

let activity = UIActivityViewController(activityItems: [activityImage, activityText()], applicationActivities: nil)

或者

let activity = UIActivityViewController(activityItems: [activityImage, activityText()], applicationActivities: nil)
class activityText: NSObject, UIActivityItemSource {
    @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }
    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
        return NSNull()
    }
}

或者

let activity = UIActivityViewController(activityItems: [activityImage, activityText()], applicationActivities: nil)
class activityText: NSObject, UIActivityItemSource {
    @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }
    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
            return nil
    }
}

或者

let activity = UIActivityViewController(activityItems: [activityImage, activityText()], applicationActivities: nil)
class activityText: NSObject, UIActivityItemSource {
    @objc func activityViewControllerPlaceholderItem(activityViewController: UIActivityViewController) -> AnyObject {
        return ""
    }
    @objc func activityViewController(activityViewController: UIActivityViewController, itemForActivityType activityType: String) -> AnyObject? {
            return ""
    }
}

Answer 1

问题被提出并回答： 通过UIActivityViewController（Twitter，Facebook，Instagram）与hashtag共享图像

        UIActivityViewController *activityViewController =
 [[UIActivityViewController alloc] initWithActivityItems:@[vm.image, [[ActivityStringItemSource alloc] initWithString:attributedString]] applicationActivities:nil];

实现字符串返回的类（或不是）是：

@interface ActivityStringItemSource()<UIActivityItemSource>

@property(strong, nonatomic) NSMutableAttributedString *stringContent;
@end

@implementation ActivityStringItemSource

- (instancetype)initWithString:(NSMutableAttributedString *) placeholder
{
    self = [super init];
    if (self) {
        _stringContent = placeholder;
    }
    return self;
}

- (id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController {
    return [NSObject new];
}

- (id)activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(UIActivityType)activityType {
    if([activityType containsString:@"instagram"]) {
        return nil;
    } else {
        return _stringContent;
    }
}

@end

正如最初的答案所指出的那样，关键是返回一个NSObject（该类扩展了NSObject）。 然后在项目选择中，只测试instagram以返回nil，否则返回您的字符串。

Answer 2

测试后，您只需将图像添加到 activityViewControllerPlaceholderItem

final class MyImageItemSource: NSObject, UIActivityItemSource {

    final let image: UIImage

    init(image: UIImage) {
        self.image = image
    }

    func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
        image
    }

    func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? {
        image
    }

}