为 UIActivityViewController Swift 设置不同的活动项

Posted 2023-02-23

【中文标题】为 UIActivityViewController Swift 设置不同的活动项

【英文标题】：Set different activity items for UIActivityViewController Swift

【发布时间】：2015-05-05 21:39:38

【问题描述】：

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 表中，我需要输入：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，我想在社交帖子中放置图片，还有一些字符串和NSURL。

你知道这在 ios8 中是否可以使用 Swift 吗？

我搜索了很多代码，没有找到最适合我的。

【参考方案1】：

您应该利用UIActivityItemSource 协议。 UIActivityViewController 的初始化程序的 activityItems 参数接受数据对象数组或实现 UIActivityItemSource 协议的对象数组。

例如，考虑如下的项目来源。

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")
    

以上item源根据activity类型返回不同的字符串数据对象、主题和缩略图。要使用，只需将其传递给 UIActivityViewController 初始化程序即可。

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，并将其传递到初始化程序中。

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

所有这些都在UIActivityViewController 和UIActivityItemSource 的官方文档中进行了概述

【讨论】：

@BhaveshNai：这里没有太多的 Swift 魔法。将上述内容转换为 Objective-C 应该很简单。

完全不需要写delegate = self。

你会怎么做最后一件事，“定义一个自定义的 MyUrlItemSource 类，根据所选活动返回不同的 URL”

@user6631314：除了返回URL而不是String之外，代码相同。

【参考方案2】：

Objective-C 等价于 hennes 答案：

@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

【参考方案3】：

与 hennes 相同的解决方案翻译为 swift 3

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")