chenr2 · August 29, 2015 14:25 · Jul 20, 2015 · Jul 20, 2015 · Jul 20, 2015 · Jul 20, 2015
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -114,7 +114,7 @@ task.resume()
 
 ## A better way to POST
 
-This does the same thing.
+This does the same thing, but better
 
 ```swift
 let params = [ "foo" : "bar" ]

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -122,7 +122,8 @@ request(.POST, "http://httpbin.org/post", parameters: params, encoding: .JSON)
     .validate()
     .responseJSON { (_, _, data, error) in
         if error == nil {
-            println("data:: \(data)")
+            let json = JSON(data!)
+            println("json:: \(json)")
         }
     }
 ```

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -79,7 +79,7 @@ request(.GET, url)
     }
 ```
 
-`validate()` checks these for you.  Just remember to do `if error != nil`
+Thanks to `validate()`, the `error` is triggered not only when there's a bad physical connection, but also when you get a bad response.
 
 ## What about POST?
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -60,6 +60,7 @@ Pain points:
 * Lots of boilerplate just to setup a network request.  Imagine if you have a dozen API endpoints.
 * `NSJSONSerialization` is kind of yucky.  We still need to protect against `jsonError` bombing.
 * Check out the `if-let` pyramid of doom
+* `error` is triggered if there was a physical network problem, like bad wifi.  You still need to check for status codes (`404`, `500`) and for malformed JSON.
 
 ## GET using AlamoFire and SwiftyJSON
 
@@ -70,15 +71,16 @@ let url = "https://itunes.apple.com/us/rss/topfreeapplications/limit=10/json"
 request(.GET, url)
     .validate()
     .responseJSON { (_, _, data, error) in
-        let json = JSON(data!)
-        let label = json["feed"]["entry"][0]["im:name"]["label"].stringValue
-        println("label:: \(label)")
+        if error == nil {
+            let json = JSON(data!)
+            let label = json["feed"]["entry"][0]["im:name"]["label"].stringValue
+            println("label:: \(label)")
+        }
     }
 ```
 
-Note: Normally, `error` is triggered if there was a physical network problem, like bad wifi.  You still need to check for status codes (`404`, `500`) and for malformed JSON.
-
 `validate()` checks these for you.  Just remember to do `if error != nil`
+
 ## What about POST?
 
 This is what a vanilla POST looks like.  Not only do you need to convert your dictionary to JSON, you also need to set `application/json` headers.
@@ -119,7 +121,9 @@ let params = [ "foo" : "bar" ]
 request(.POST, "http://httpbin.org/post", parameters: params, encoding: .JSON)
     .validate()
     .responseJSON { (_, _, data, error) in
-        println("data:: \(data)")
+        if error == nil {
+            println("data:: \(data)")
+        }
     }
 ```
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -76,6 +76,9 @@ request(.GET, url)
     }
 ```
 
+Note: Normally, `error` is triggered if there was a physical network problem, like bad wifi.  You still need to check for status codes (`404`, `500`) and for malformed JSON.
+
+`validate()` checks these for you.  Just remember to do `if error != nil`
 ## What about POST?
 
 This is what a vanilla POST looks like.  Not only do you need to convert your dictionary to JSON, you also need to set `application/json` headers.

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -69,7 +69,7 @@ Syntax is tighter and easier to read.
 let url = "https://itunes.apple.com/us/rss/topfreeapplications/limit=10/json"
 request(.GET, url)
     .validate()
-    .responseJSON { (_, _, data, _) in
+    .responseJSON { (_, _, data, error) in
         let json = JSON(data!)
         let label = json["feed"]["entry"][0]["im:name"]["label"].stringValue
         println("label:: \(label)")
@@ -115,7 +115,7 @@ This does the same thing.
 let params = [ "foo" : "bar" ]
 request(.POST, "http://httpbin.org/post", parameters: params, encoding: .JSON)
     .validate()
-    .responseJSON { (_, _, data, _) in
+    .responseJSON { (_, _, data, error) in
         println("data:: \(data)")
     }
 ```

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -114,6 +114,7 @@ This does the same thing.
 ```swift
 let params = [ "foo" : "bar" ]
 request(.POST, "http://httpbin.org/post", parameters: params, encoding: .JSON)
+    .validate()
     .responseJSON { (_, _, data, _) in
         println("data:: \(data)")
     }

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -68,6 +68,7 @@ Syntax is tighter and easier to read.
 ```swift
 let url = "https://itunes.apple.com/us/rss/topfreeapplications/limit=10/json"
 request(.GET, url)
+    .validate()
     .responseJSON { (_, _, data, _) in
         let json = JSON(data!)
         let label = json["feed"]["entry"][0]["im:name"]["label"].stringValue

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -143,7 +143,7 @@ While this works, you still have to address 3 problems:
 * Cache validation.  You need to inspect the downloaded image and make sure you don't cache a corrupt image.
 * `UIImage` thread safety.  Now that you're caching, multiple cells will call `UIImage(data: data)` simultaneously and crash intermittently.
 
-(Btw, `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2 automatically.)
+(A fourth problem with the code above: `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2 automatically.)
 
 ## A better way to download images
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -143,7 +143,7 @@ While this works, you still have to address 3 problems:
 * Cache validation.  You need to inspect the downloaded image and make sure you don't cache a corrupt image.
 * `UIImage` thread safety.  Now that you're caching, multiple cells will call `UIImage(data: data)` simultaneously and crash intermittently.
 
-(Btw, `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2.  CDNs would benefit from the SPDY features, so image downloads especially should avoid `NSURLConnection`)
+(Btw, `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2 automatically.)
 
 ## A better way to download images
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -137,14 +137,14 @@ NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
 }
 ```
 
-(Btw, `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2.  CDNs would benefit from the SPDY features, so image downloads especially should avoid `NSURLConnection`)
-
 While this works, you still have to address 3 problems:
 
 * Image caching.  You need to respect your customer's data usage.
 * Cache validation.  You need to inspect the downloaded image and make sure you don't cache a corrupt image.
 * `UIImage` thread safety.  Now that you're caching, multiple cells will call `UIImage(data: data)` simultaneously and crash intermittently.
 
+(Btw, `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2.  CDNs would benefit from the SPDY features, so image downloads especially should avoid `NSURLConnection`)
+
 ## A better way to download images
 
 This is how to download an image using the Network Starter Kit.  It also fixes the 3 problems mentioned above.

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -137,6 +137,8 @@ NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
 }
 ```
 
+(Btw, `NSURLConnection` is deprecated.  Use `NSURLSession` instead because it supports HTTP/2.  CDNs would benefit from the SPDY features, so image downloads especially should avoid `NSURLConnection`)
+
 While this works, you still have to address 3 problems:
 
 * Image caching.  You need to respect your customer's data usage.

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -166,7 +166,6 @@ But there's also this `.responseImage()` that gives you back an image on a silve
 
 Go over the router
 
-```
 ## Multipart
 
 Go over the multipart
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -166,6 +166,7 @@ But there's also this `.responseImage()` that gives you back an image on a silve
 
 Go over the router
 
+```
 ## Multipart
 
 Go over the multipart
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -6,7 +6,7 @@ This is the script for Tuesday's Columbia iOS meetup.
 
 ## Some basics
 
-Thing | Contains
+Object | Contains
 ----- | --------
 URL | http://www.google.com?q=foo
 Request | verb, timeout, url, headers, body

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -9,8 +9,9 @@ This is the script for Tuesday's Columbia iOS meetup.
 Thing | Contains
 ----- | --------
 URL | http://www.google.com?q=foo
-
-
+Request | verb, timeout, url, headers, body
+Task | resume, cancel
+Session | like a browser session
 
 ## GET Request
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -6,9 +6,9 @@ This is the script for Tuesday's Columbia iOS meetup.
 
 ## Some basics
 
-| Thing | Contains |
-|||-
-| URL | http://www.google.com?q=foo |
+Thing | Contains
+----- | --------
+URL | http://www.google.com?q=foo
 
 
 
@@ -163,3 +163,8 @@ But there's also this `.responseImage()` that gives you back an image on a silve
 
 ## What if you have a lot of API calls?
 
+Go over the router
+
+## Multipart
+
+Go over the multipart
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -4,6 +4,14 @@ See [Network Starter Kit](http://www.thorntech.com/2015/07/4-essential-swift-net
 
 This is the script for Tuesday's Columbia iOS meetup.
 
+## Some basics
+
+| Thing | Contains |
+|||-
+| URL | http://www.google.com?q=foo |
+
+
+
 ## GET Request
 
 Problem statement.

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -109,7 +109,7 @@ request(.POST, "http://httpbin.org/post", parameters: params, encoding: .JSON)
     }
 ```
 
-## How about downloading images
+## How about downloading images?
 
 This is the normal way:
 
@@ -152,3 +152,6 @@ You see AlamoFire at work.
 But there's also this `.responseImage()` that gives you back an image on a silver platter.  This is thanks to an Image Response Serializer from a RW tutorial.
 
 (Note to self: when doing the demo on a blank project, don't forget to follow the integration steps.  You'll need to at least include the 2 `extension`s at the bottom of the Router.  And the caching lines in `AppDelegate`)
+
+## What if you have a lot of API calls?
+
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -147,4 +147,8 @@ request(.GET, "http://tsumtsumdisney.com/wp-content/uploads/2014/10/Snow-White-a
     }
 ```
 
-(Note: when doing the demo on a blank project, don't forget to follow the integration steps.  You'll need to at least include the 2 `extension`s at the bottom of the Router.  And the caching lines in `AppDelegate`)
+You see AlamoFire at work.
+
+But there's also this `.responseImage()` that gives you back an image on a silver platter.  This is thanks to an Image Response Serializer from a RW tutorial.
+
+(Note to self: when doing the demo on a blank project, don't forget to follow the integration steps.  You'll need to at least include the 2 `extension`s at the bottom of the Router.  And the caching lines in `AppDelegate`)
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -130,9 +130,9 @@ NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
 
 While this works, you still have to address 3 problems:
 
-# Image caching.  You need to respect your customer's data usage.
-# Cache validation.  You need to inspect the downloaded image and make sure you don't cache a corrupt image.
-# `UIImage` thread safety.  Now that you're caching, multiple cells will call `UIImage(data: data)` simultaneously and crash intermittently.
+* Image caching.  You need to respect your customer's data usage.
+* Cache validation.  You need to inspect the downloaded image and make sure you don't cache a corrupt image.
+* `UIImage` thread safety.  Now that you're caching, multiple cells will call `UIImage(data: data)` simultaneously and crash intermittently.
 
 ## A better way to download images
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -128,11 +128,15 @@ NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
 }
 ```
 
-## A better way to download images
+While this works, you still have to address 3 problems:
 
-This is how to download an image using the Network Starter Kit.
+# Image caching.  You need to respect your customer's data usage.
+# Cache validation.  You need to inspect the downloaded image and make sure you don't cache a corrupt image.
+# `UIImage` thread safety.  Now that you're caching, multiple cells will call `UIImage(data: data)` simultaneously and crash intermittently.
 
-(Note: when doing the demo on a blank project, don't forget to follow the integration steps.  You'll need to at least include the 2 `extension`s at the bottom of the Router.  And the caching lines in `AppDelegate`)
+## A better way to download images
+
+This is how to download an image using the Network Starter Kit.  It also fixes the 3 problems mentioned above.
 
 ```swift
 request(.GET, "http://tsumtsumdisney.com/wp-content/uploads/2014/10/Snow-White-and-the-Seven-Dwarfs-Tsum-Tsum-Set-of-8-0-0.jpg")
@@ -143,3 +147,4 @@ request(.GET, "http://tsumtsumdisney.com/wp-content/uploads/2014/10/Snow-White-a
     }
 ```
 
+(Note: when doing the demo on a blank project, don't forget to follow the integration steps.  You'll need to at least include the 2 `extension`s at the bottom of the Router.  And the caching lines in `AppDelegate`)
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -130,11 +130,16 @@ NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
 
 ## A better way to download images
 
+This is how to download an image using the Network Starter Kit.
+
+(Note: when doing the demo on a blank project, don't forget to follow the integration steps.  You'll need to at least include the 2 `extension`s at the bottom of the Router.  And the caching lines in `AppDelegate`)
+
 ```swift
 request(.GET, "http://tsumtsumdisney.com/wp-content/uploads/2014/10/Snow-White-and-the-Seven-Dwarfs-Tsum-Tsum-Set-of-8-0-0.jpg")
     .responseImage() { (request, _, image, error) in
         if error == nil && image != nil {
             self.imageView.image = image
         }
     }
-```
+```
+
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -126,4 +126,15 @@ NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
         }
     }
 }
+```
+
+## A better way to download images
+
+```swift
+request(.GET, "http://tsumtsumdisney.com/wp-content/uploads/2014/10/Snow-White-and-the-Seven-Dwarfs-Tsum-Tsum-Set-of-8-0-0.jpg")
+    .responseImage() { (request, _, image, error) in
+        if error == nil && image != nil {
+            self.imageView.image = image
+        }
+    }
 ```
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -107,4 +107,23 @@ request(.POST, "http://httpbin.org/post", parameters: params, encoding: .JSON)
     .responseJSON { (_, _, data, _) in
         println("data:: \(data)")
     }
+```
+
+## How about downloading images
+
+This is the normal way:
+
+```swift
+let url = NSURL(string: "http://tsumtsumdisney.com/wp-content/uploads/2014/10/Snow-White-and-the-Seven-Dwarfs-Tsum-Tsum-Set-of-8-0-0.jpg")
+let request = NSURLRequest(URL: url!)
+let mainQueue = NSOperationQueue.mainQueue()
+NSURLConnection.sendAsynchronousRequest(request, queue: mainQueue) {
+    (response, data, error) -> Void in
+    if error == nil {
+        let image = UIImage(data: data)
+        dispatch_async(dispatch_get_main_queue()) {
+            self.imageView.image = image
+        }
+    }
+}
 ```
diff --git a/demoNetwork.md b/demoNetwork.md
@@ -52,7 +52,7 @@ Pain points:
 * `NSJSONSerialization` is kind of yucky.  We still need to protect against `jsonError` bombing.
 * Check out the `if-let` pyramid of doom
 
-## AlamoFire and SwiftyJSON to the rescue
+## GET using AlamoFire and SwiftyJSON
 
 Syntax is tighter and easier to read.
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -8,9 +8,7 @@ This is the script for Tuesday's Columbia iOS meetup.
 
 Problem statement.
 
-Just to get this output:
-
-`label:: Agar.io`
+Just to get this output:  `label:: Agar.io`
 
 we have all this code:
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -6,7 +6,7 @@ This is the script for Tuesday's Columbia iOS meetup.
 
 ## GET Request
 
-This is what's wrong with the world
+Problem statement.
 
 Just to get this output:
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -4,7 +4,9 @@ See [Network Starter Kit](http://www.thorntech.com/2015/07/4-essential-swift-net
 
 This is the script for Tuesday's Columbia iOS meetup.
 
-## GET Request: What's wrong with the world
+## GET Request
+
+This is what's wrong with the world
 
 Just to get this output:
 

diff --git a/demoNetwork.md b/demoNetwork.md
@@ -4,7 +4,7 @@ See [Network Starter Kit](http://www.thorntech.com/2015/07/4-essential-swift-net
 
 This is the script for Tuesday's Columbia iOS meetup.
 
-## What's wrong with the world
+## GET Request: What's wrong with the world
 
 Just to get this output: