UIActivityController 原生分享

 @IBAction func share(_ sender: Any) {
    let textToShare = "yourShareString";
    let imageToShare = UIImage.init(named: "yourImageName")
    let urlToShare = URL.init(string: "yourShareLink")
    let activityItems = [imageToShare!,urlToShare!,textToShare] as [Any];

    let activity: UIActivityViewController = UIActivityViewController.init(activityItems: activityItems, applicationActivities: nil)
    self.present(activity, animated: true, completion: nil)
   }

看到这里，大家可能想说，so easy 谁都会嘛。你如果直接这样分享到facebook 或者 twitter的时候你会发现结果是这样的：

Paste_Image.png

细心点的同学就会发现，where is my share link?
我想说的，我也不知道哪儿去了，不过你可以在textToShare后面拼接上要分享的链接，如图：

Paste_Image.png
但是看起来都长到一块儿去了，别急，慢慢来。微信的分享很与众不同，假如你只想分享一条文字，或者一条文字和图片到微信：

@IBAction func share(_ sender: Any) {
  let textToShare = "yourShareString";
  let imageToShare = UIImage.init(named: "yourImageName")
  let activityItems = [imageToShare,textToShare] as [Any];

  let activity: UIActivityViewController = UIActivityViewController.init(activityItems: activityItems, applicationActivities: nil)
  self.present(activity, animated: true, completion: nil)
  }

貌似是不行的，它会变成这样：

Paste_Image.png

因为微信的分享都是需要URL的，而且你还不能把URL的string写成""：

let urlToShare = URL.init(string: "")

它会报found nil的错误:

fatal error: unexpectedly found nil while unwrapping an Optional value

这个是比较坑爹的，加上正确格式的url之后就是正常的啦：

Paste_Image.png

细心的同学又会发现text后面拼接的url在微信里面展示出来了，这该怎么办呢,看到这里，仅仅使用那些上面的字符串拼接的方式不行了，得使用UIActivityItemProvider了

 @IBAction func share(_ sender: Any) {
  
  let textToShare = "yourShareString";
  let imageToShare = UIImage.init(named: "yourImageName")
  let itemProvider = customItemProvider.init(placeholderItem: "")
  
  let activity: UIActivityViewController = UIActivityViewController.init(activityItems: [imageToShare!,textToShare,itemProvider], applicationActivities: nil)
  self.present(activity, animated: true, completion: nil)
 }

class customItemProvider: UIActivityItemProvider {
 
 override init(placeholderItem: Any) {
  super.init(placeholderItem: placeholderItem)
 }
 
 override func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
  return ""
 }
 
 override func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
  if activityType == .postToFacebook || activityType == .postToTwitter {
   return "https://baidu.com"
  } else {
   return URL.init(string: "https://baidu.com")//wechat need a URL 
  }
 }
}

r结果如下:

Paste_Image.png Paste_Image.png

总之，微信分享比较特殊，它只能只有一张图片，或者一定要给一个有效的URL（不是string），而且给了URL没有给图片的时候它会自己生成一个灰色的🔗icon，UED同学可就不乐意了。于是乎比较规范的方式是定义三个不同的itemProvider，如下：

class ImageItemProvider: UIActivityItemProvider {
 override init(placeholderItem: Any) {
  super.init(placeholderItem: placeholderItem)
 }
 override func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
  if activityType == .postToFacebook || activityType == .postToTwitter {
   return nil//脸书和推特不需要图片的时候返回nil就没有图片了
  } else {
   return UIImage.init(named: "yourImageName")//觉得微信自己生成的图片太丑的时候可以返回一个，即时返回nil，它也会自动生成🔗图片
  }
 }
}

class UrlItemProvider: UIActivityItemProvider {
 override init(placeholderItem: Any) {
  super.init(placeholderItem: placeholderItem)
 }
 override func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
  if activityType == .postToFacebook || activityType == .postToTwitter {
   return "https://baidu.com"
  } else {
   return URL.init(string: "https://baidu.com")//wechat need a URL
  }
 }
}

class TitleItemProvider: UIActivityItemProvider {
 override init(placeholderItem: Any) {
  super.init(placeholderItem: placeholderItem)
 }
 override func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
  if activityType == .postToFacebook || activityType == .postToTwitter {
   return "faceBook or twitter"
  } else {
   return "wechat"
  }
 }
}

j:

Paste_Image.png Paste_Image.png

twitter has no icon and wechat has