iOS 10新的通知机制中添加图片的方法详解

1、新建target

2、实现unnotificationserviceextension

我这里用的是swift

//
// notificationservice.swift
// notificationserviceextension
//
// created by heyuan li on 17/2/26.
// copyright © 2017年 fenbi. all rights reserved.
//
 
import usernotifications
 
class notificationservice: unnotificationserviceextension {
 
 var contenthandler: ((unnotificationcontent) -> void)?
 var bestattemptcontent: unmutablenotificationcontent?
 
 override func didreceive(_ request: unnotificationrequest, withcontenthandler contenthandler: @escaping (unnotificationcontent) -> void) {
  self.contenthandler = contenthandler
  bestattemptcontent = (request.content.mutablecopy() as? unmutablenotificationcontent)
  
  if let bestattemptcontent = bestattemptcontent {
   // modify the notification content here...
   bestattemptcontent.title = "上课啦"
 
   if let imageurlstring = bestattemptcontent.userinfo["image"] as? string,
    let url = url(string: imageurlstring)
   {
    downloadandsave(url: url) { localurl in
     if let localurl = localurl {
      do {
       let attachment = try unnotificationattachment(identifier: "image_downloaded", url: localurl, options: nil)
       bestattemptcontent.attachments = [attachment]
      } catch {
       print(error)
      }
     }
     contenthandler(bestattemptcontent)
    }
   }
  }
 }
 
 override func serviceextensiontimewillexpire() {
  // called just before the extension will be terminated by the system.
  // use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
  if let contenthandler = contenthandler, let bestattemptcontent = bestattemptcontent {
   contenthandler(bestattemptcontent)
  }
 }
 
 private func downloadandsave(url: url, handler: @escaping (_ localurl: url?) -> void) {
  let task = urlsession.shared.datatask(with: url, completionhandler: {
   data, res, error in
 
   var localurl: url? = nil
 
   if let data = data {
    let ext = (url.absolutestring as nsstring).pathextension
    let cachedirs = filemanager.default.urls(for: .cachesdirectory, in: .userdomainmask)
    if cachedirs.count > 0 {
     let cachedir = cachedirs[cachedirs.count - 1]
     /// todo tutor cache
     /// todo md5 extension
      let url = cachedir.appendingpathcomponent("123").appendingpathextension(ext)
 
      if let _ = try? data.write(to: url) {
       localurl = url
      }
 
   }
   }
   
   handler(localurl)
  })
  
  task.resume()
 }
 
}

3、发push的时候，加上”mutable-content”: 1

{
 "aps": {
 "alert": "instant message from crm",
 "sound": "default", 
 "mutable-content": 1
 },
......
 "image": "https://g0.fbcontent.cn/api/tutor/images/153c6c68411747f.jpg"
}

这个很关键

最后运行，就会自动展示图片啦。

需要说明的是，默认是只能https的，如果想显示http图片，需要自行设定ats相关配置。

总结

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