Xcode8になっていろいろ変わったこと ref: http://qiita.com/g-1/items/7fb052e05369c2540f40

file0.txt

-  override func activityType() -> String? {
-    return "XXXX"
+  override var activityType : UIActivityType {
+    return UIActivityType(rawValue: "XXXX")
   }

file1.txt

[[UIApplication sharedApplication] openURL:url
                                       options:@{}
                             completionHandler:nil];

file2.txt

-  override func activityType() -> String? {
-    return "XXXX"
+  override var activityType : UIActivityType {
+    return UIActivityType(rawValue: "XXXX")
   }

swift3.0

UIApplication.shared.open(url, options: [:], completionHandler: nil)