Looks like Apple converts strings incorrectly in UIActivityViewController

Question

I was trying to figure out why UIActivityViewController sent a slightly converted string to share for Mail and WeChat.

This is my code:

let activityViewController = UIActivityViewController(activityItems: ["http://preprodgo.travelstart.com/search-on-index?version=3&timestamp=2017-09-15_10-31-27-031"], applicationActivities: nil)

self.present(activityViewController, animated: true, completion: nil)

And when shared by Mail, it was shown as:

http://preprodgo.travelstart.com/search-on-index?version=3×tamp=2017-09-15_10-31-27-031

The system version is 10.3.3.

Answer 1

Solved by giving special case when sharing in mail and Wechat:

@objc class TSActivityProvider: NSObject, UIActivityItemSource {
   func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
       //...
       if activityType == .mail || activityType == .postToWeibo {
            message = message.xmlSimpleEscape()
        }
       return message
   }
}


// https://stackoverflow.com/questions/803676/encode-nsstring-for-xml-html
extension String
{
     func xmlSimpleEscape() -> String
    {
        let mapList : SimpleToFromRepalceList = [
            ("&",  "&"),
            ("\"", """),
            ("'",  "'"),
            (">",  ">"),
            ("<",  "&lt;")]

        return self.simpleReplace(mapList: mapList)
    }
}

Kind of work around for escaping html. I think Apple should provide suggested parsing method in UIActivityType and do auto escaping when receiving in string.