Question

我有UIActivityViewController有4个选项：消息/邮件/ TW / FB 。我想为每个选项发送不同的活动！

例如：在iMessage表格中，我需要添加：String，NSURL和UIImage。在邮件中，我需要在主题字段中放置字符串，然后在正文中放置字符串，UIImage和NSURL。在TW/FB我希望将图片放置为社交帖子，也是一些字符串和NSURL。

你知道在iOS8中是否可以使用Swift吗？

我搜索了很多代码，但没有找到最适合我的。

Answer 1

您应该利用UIActivityItemSource协议。 activityItems初始值设定项的UIActivityViewController参数接受数据对象数组或实现UIActivityItemSource协议的对象数组。

作为示例，请考虑以下项目来源。

class MyStringItemSource: 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
    }

    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 ""
    }

    func activityViewController(activityViewController: UIActivityViewController, thumbnailImageForActivityType activityType: String!, suggestedSize size: CGSize) -> UIImage! {
        if activityType == UIActivityTypeMessage {
            return UIImage(named: "thumbnail-for-message")
        } else if activityType == UIActivityTypeMail {
            return UIImage(named: "thumbnail-for-mail")
        } else if activityType == UIActivityTypePostToTwitter {
            return UIImage(named: "thumbnail-for-twitter")
        } else if activityType == UIActivityTypePostToFacebook {
            return UIImage(named: "thumbnail-for-facebook")
        }
        return UIImage(named: "some-default-thumbnail")
    }
}

上述项目源根据活动类型返回不同的字符串数据对象，主题和缩略图。要使用，您只需将其传递到UIActivityViewController初始化程序。

UIActivityViewController(activityItems: [MyStringItemSource()], applicationActivities: nil)

同样，您可以定义一个自定义MyUrlItemSource类，该类根据所选活动返回不同的URL，并在初始化程序中传递它。

UIActivityViewController(activityItems: [MyStringItemSource(), MyUrlItemSource()], applicationActivities: nil)

所有这些都在UIActivityViewController和UIActivityItemSource

的官方文档中列出

Answer 2

从hennes转换为 swift 3

的相同解决方案

class MyStringItemSource: NSObject, UIActivityItemSource {

  public func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
    return ""
  }

  public func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
    if activityType == UIActivityType.message {
      return "String for message"
    } else if activityType == UIActivityType.mail {
      return "String for mail"
    } else if activityType == UIActivityType.postToTwitter {
      return "String for twitter"
    } else if activityType == UIActivityType.postToFacebook {
      return "String for facebook"
    }
    return nil
  }

  public func activityViewController(_ activityViewController: UIActivityViewController, subjectForActivityType activityType: UIActivityType?) -> String {
    if activityType == UIActivityType.message {
      return "Subject for message"
    } else if activityType == UIActivityType.mail {
      return "Subject for mail"
    } else if activityType == UIActivityType.postToTwitter {
      return "Subject for twitter"
    } else if activityType == UIActivityType.postToFacebook {
      return "Subject for facebook"
    }
    return ""
  }

  public func activityViewController(_ activityViewController: UIActivityViewController, thumbnailImageForActivityType activityType: UIActivityType?, suggestedSize size: CGSize) -> UIImage? {
    if activityType == UIActivityType.message {
      return UIImage(named: "thumbnail-for-message")
    } else if activityType == UIActivityType.mail {
      return UIImage(named: "thumbnail-for-mail")
    } else if activityType == UIActivityType.postToTwitter {
      return UIImage(named: "thumbnail-for-twitter")
    } else if activityType == UIActivityType.postToFacebook {
      return UIImage(named: "thumbnail-for-facebook")
    }
    return UIImage(named: "some-default-thumbnail")
  }

}

Answer 3

Objective-C相当于hennes回答：

@interface MyStringItemSource : NSObject <UIActivityItemSource>
{

}

@end


@implementation MyStringItemSource

-(id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController
{
    return @"";
}

-(id)activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(UIActivityType)activityType
{
    if (activityType == UIActivityTypeMessage) {
        return @"String for message";
    } else if (activityType == UIActivityTypeMail) {
        return @"String for mail";
    }
    return nil;
}

-(NSString *)activityViewController:(UIActivityViewController *)activityViewController subjectForActivityType:(UIActivityType)activityType
{
    if (activityType == UIActivityTypeMessage) {
        return @"Subject for message";
    } else if (activityType == UIActivityTypeMail) {
        return @"Subject for mail";
    }
    return @"";
}

-(UIImage *)activityViewController:(UIActivityViewController *)activityViewController thumbnailImageForActivityType:(UIActivityType)activityType suggestedSize:(CGSize)size
{
    if (activityType == UIActivityTypeMessage) {
        return [UIImage imageNamed: @"thumbnail-for-message"];
    } else if (activityType == UIActivityTypeMail) {
        return [UIImage imageNamed: @"thumbnail-for-mail"];
    }
    return [UIImage imageNamed: @"thumbnail-for-default"];
}

@end

为UIActivityViewController Swift设置不同的活动项目

3 个答案: