better casting of fetched dictionary values

Author: mattneub

bk2ch17p697pickaMovieOrPhoto/ch30p960pickaMovie/ViewController.swift

@@ -121,14 +121,14 @@ extension ViewController : UIImagePickerControllerDelegate, UINavigationControll
     func imagePickerController(picker: UIImagePickerController!,
         didFinishPickingMediaWithInfo info: [NSObject : AnyObject]!) {
             println(info[UIImagePickerControllerReferenceURL])
-            let url = info[UIImagePickerControllerMediaURL] as NSURL?
-            var im = info[UIImagePickerControllerOriginalImage] as UIImage?
-            var edim = info[UIImagePickerControllerEditedImage] as UIImage?
+            let url = info[UIImagePickerControllerMediaURL] as? NSURL
+            var im = info[UIImagePickerControllerOriginalImage] as? UIImage
+            var edim = info[UIImagePickerControllerEditedImage] as? UIImage
             if edim != nil {
                 im = edim
             }
             self.dismissViewControllerAnimated(true) {
-                let type = info[UIImagePickerControllerMediaType] as String?
+                let type = info[UIImagePickerControllerMediaType] as? String
                 if type != nil {
                     switch type! {
                     case kUTTypeImage:

bk2ch17p702takeAPicture/ch30p962takeAPicture/ViewController.swift

@@ -84,14 +84,14 @@ UINavigationControllerDelegate, UIImagePickerControllerDelegate {
     func imagePickerController(picker: UIImagePickerController,
         didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
             println(info[UIImagePickerControllerReferenceURL])
-            let url = info[UIImagePickerControllerMediaURL] as NSURL?
-            var im = info[UIImagePickerControllerOriginalImage] as UIImage?
-            let edim = info[UIImagePickerControllerEditedImage] as UIImage?
+            let url = info[UIImagePickerControllerMediaURL] as? NSURL
+            var im = info[UIImagePickerControllerOriginalImage] as? UIImage
+            let edim = info[UIImagePickerControllerEditedImage] as? UIImage
             if edim != nil {
                 im = edim
             }
             self.dismissViewControllerAnimated(true) {
-                let type = info[UIImagePickerControllerMediaType] as String?
+                let type = info[UIImagePickerControllerMediaType] as? String
                 if type != nil {
                     switch type! {
                     case kUTTypeImage:

bk2ch17p704takeAPicture2/ch30p962takeAPicture2/ViewController.swift

@@ -96,7 +96,7 @@ UINavigationControllerDelegate, UIImagePickerControllerDelegate {
     }
 
     func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]!) {
-        var im = info[UIImagePickerControllerOriginalImage] as UIImage?
+        var im = info[UIImagePickerControllerOriginalImage] as? UIImage
         if im == nil {
             return
         }