v5.0: core data

cyper · cyper · commit b5e0a42ca7a1 · 2016-11-01T03:12:47.000+08:00
diff --git a/README.md b/README.md
@@ -334,7 +334,6 @@ leading.isActive = true
 
 ### &#20851;&#38381;view controller&#20004;&#31181;&#21150;&#27861;
 
-
 ```swift
 @IBAction func saveRestaurant() {
 if checkForm() {
@@ -345,6 +344,87 @@ performSegue(withIdentifier: "unwindToHomeScreen", sender: self)
 ```
 &#22240;&#20026;&#25105;&#24819;&#27839;&#29992;Cancel&#25353;&#38062;&#20351;&#29992;&#30340;unwind segue,&#22312;&#29992;&#31532;2&#31181;&#26041;&#27861;&#30340;&#26102;&#20505;&#30896;&#21040;&#20102;&#25214;&#19981;&#21040;unwind segue identifier&#30340;&#38382;&#39064;, &#21442;&#35265;[SO]&#35299;&#20915;: &#34429;&#28982;unwind segue&#30340;Action segue&#26159;&#26681;&#25454;&#20320;&#25152;&#23450;&#20041;&#30340;func&#21517;&#23383;&#29983;&#25104;&#30340;, &#20294;&#26159;identifier&#36824;&#26159;&#38656;&#35201;&#33258;&#24049;&#25351;&#23450;.
 
+### CoreData Data Model
+&#26032;&#24314;&#19968;&#20010;Data Model: `FoodPinDemo.xcdatamodeld`, Entity&#25913;&#21517;&#20026;Restaurant, Class&#25913;&#21517;&#20026;RestaurantMO(&#36825;&#20010;Managed Object&#31867;&#32534;&#35793;&#39033;&#30446;&#20250;&#33258;&#21160;&#29983;&#25104;, project&#20013;&#30475;&#19981;&#21040;)
+
+RestaurantMO&#25152;&#26377;&#23646;&#24615;&#37117;&#21464;&#25104;&#20102;optional, &#24182;&#19988;image(binary)&#30340;&#31867;&#22411;&#20026;NSData.
+
+&#20027;&#35201;&#21464;&#21270;
+
+1. UIImage(named: restaurant.image) -> UIImage(data: restaurant.image as! Data)
+2. resturant.location -> restaurant.location!
+3. restaurant.rating -> restaurant.rating ?? ""
+
+&#20043;&#21069;&#30340;Restaurant.swift&#24223;&#25481;, &#21487;&#20197;&#21024;&#38500;.
+
+### CoreData CRUD
+findAll, &#22312;viewWillAppear&#20013;&#21152;&#20837;:
+
+```swift
+let appDelegate = UIApplication.shared.delegate as! AppDelegate
+let ctx = appDelegate.persistentContainer.viewContext
+let request: NSFetchRequest<RestaurantMO> = RestaurantMO.fetchRequest()
+let restaurants = try! ctx.fetch(request)
+```
+
+&#31616;&#21333;&#23553;&#35013;&#30340;&#24037;&#20855;&#31867;CD(save&#20256;&#30340;&#21442;&#25968;&#27809;&#26377;&#29992;&#21040;, &#21482;&#26159;&#20026;&#20102;&#22909;&#30475;!):
+
+```swift
+class CD {
+
+class var appDelegate: AppDelegate {
+return UIApplication.shared.delegate as! AppDelegate
+}
+class var ctx: NSManagedObjectContext {
+return appDelegate.persistentContainer.viewContext
+}
+
+class func delete<T: NSManagedObject>(_ o: T) {
+ctx.delete(o)
+save(o)
+}
+
+class func save(_ _: NSManagedObject) {
+appDelegate.saveContext()
+}
+
+class func image2Data(image: UIImage?) -> NSData? {
+if let image = image {
+if let imageData = UIImagePNGRepresentation(image) {
+return NSData(data: imageData)
+}
+}
+
+return nil
+}
+```
+&#36825;&#20010;&#31867;&#38388;&#27463;&#24615;&#30340;&#25253;ambiguous use of x &#30340;&#38169;&#35823;, &#20294;&#26159;&#31243;&#24207;&#33021;&#27491;&#24120;&#36816;&#34892;, &#24576;&#30097;&#26159;Xcode8.1&#30340;bug.
+
+&#22686;&#21024;&#25913;&#26597;:
+
+```swift
+// create (AddRestaurantController)
+let restaurant = RestaurantMO(context: CD.ctx)
+restaurant.name = name
+restaurant.type = type
+restaurant.image = CD.image2Data(image: photoImageView.image)
+CD.save(restaurant)
+
+// delete (editActionsForRowAt)
+let restaurant = restaurants.remove(at: indexPath.row)
+tableView.deleteRows(at: [indexPath], with: .fade)
+CD.delete(restaurant)
+
+// update (ratingButtonTapped)
+restaurant.isVisited = true
+CD.save(restaurant)
+
+// find all (viewWillAppear)
+let request: NSFetchRequest<RestaurantMO> = RestaurantMO.fetchRequest()
+restaurants = try! CD.ctx.fetch(request)
+tableView.reloadData()
+```
+&#24453;&#30740;&#31350;: http://stackoverflow.com/questions/37810967/how-to-apply-the-type-to-a-nsfetchrequest-instance
 
 ### Keywords
 
@@ -365,6 +445,7 @@ performSegue(withIdentifier: "unwindToHomeScreen", sender: self)
 ### Omitted
 1. Swipe to hide
 2. MapKit: show image on callout bubble
+3. NSFetchedResultsController
 
 ### Xcode tricks
 
