Question

我使用UIActivityViewController分享文字和图片。该图片来自activityImage，即UIImage()。自定义文本来自activityText()，它是从UIActivityItemSource协议返回的。

麻烦的是，Instagram只能在UIActivityViewController的某些条件下显示。

总结以下测试：

Instagram仅UIActivityViewController activityItems: [activityImage]和activityItems: [activityImage, NSNull()]

可见

即使返回的activityItems: [activityImage, activityText()]协议值为UIActivityItemSource，""，nil，Instagram仍为NSNull() 隐藏 }。

问题是需要调用UIActivityItemSource协议，以便可以单独管理不同的共享平台。

问题：



如何在调用UIActivityItemSource协议时与Instagram分享？



在调用""协议时，我可以尝试nil，NSNull()和UIActivityItemSource有哪些替代方案？

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)
}

试验：

Instagram UIActivityViewController

中可见

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

或

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

Instagram在UIActivityViewController

中隐藏

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

或

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

或

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

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

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

问题在Share image with hashtag via UIActivityViewController (Twitter, Facebook, Instagram)

提出并回答

        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）：

@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，否则返回你的字符串。

使用`UIActivityItemSource`协议无法使用Instagram共享

1 个答案: