Converted Chinese Documentation (zh)

pages/zh/lb2/6094911.md

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+---
+title: "Creating a LoopBack iOS app: part two"
+lang: zh
+layout: page
+keywords: LoopBack
+tags:
+sidebar: zh_lb2_sidebar
+permalink: /doc/zh/lb2/6094911.html
+summary:
+---
+
+*   Download the [server side code](https://github.com/strongloop-community/sample-applications/tree/master/BooksServer)
+*   Download the [iOS client application](https://github.com/strongloop-community/sample-applications/tree/master/BooksClient)
+
+This is the second of a two-part tutorial on creating a simple iOS app that connects to a [LoopBack](http://docs.strongloop.com/display/DOC/LoopBack) server application to perform create, read, update, and delete (CRUD) operations.   
+
+If you haven't already done so, read [part one](https://docs.strongloop.com/display/LB/Creating+a+LoopBack+iOS+app%3A+part+one) before continuing.
+
+## Add navigation control
+
+To add a navigation control to your app:
+
+1.  Select Books Collection View Controller.
+2.  Click **Editor > Embed In > Navigation Controller**. This will add a Navigation Item under the Books Collection View Controller, as shown below.
+3.  Select the new Navigation Item and name it "Books Collection" in the attribute inspector.
+    {% include image.html file="9830436.png" alt="" %}
+
+## Implement the Add Book interface
+
+To add the interface elements that enable a user to add a book:
+
+1.  From the object library in lower right corner of the XCode window, select **Bar Button** Item.
+2.  Drag and drop it to the top right corner of the app shown in the XCode storyboard.
+3.  In the attribute inspector change **Identifier** to **Add**, as shown below.
+4.  Right click the Add bar button and Control-drag the circle next to action to the Books Collection View Controller. Select 'modal' as action.
+    {% include image.html file="9830447.png" alt="" %} 
+
+### Add another View Controller
+
+When the user clicks the "+" button you want the app to show a screen to add a book to the collection.  To do that you need to add another View Controller:
+
+1.  Drag a **View Controller** element from the Object Library into the storyboard.
+2.  Name this View Controller "Add Book".
+    {% include image.html file="9830442.png" alt="" %} 
+3.  Now connect the "+" button from the Books Collection View Controller to this screen: Control-dragg the "+" button from the **Books Collection View Controller** to the** Add Books View Controller**. This creates a segue. 
+4.  Select **modal** as segue type. 
+5.  Implement the segue action by adding the following code to `ViewController.m`:
+
+    **ViewController.m**
+
+    ```
+    ...
+    @implementation ViewController 
+    //Add these 3 lines
+    - (IBAction)unwindToList:(UIStoryboardSegue *)segue
+    {
+    }
+    ...
+    - (void)viewDidLoad
+    ```
+
+### Add navigation to View Controller
+
+Now add navigation to the "Add Books" View Controller as follows:
+
+1.  Select the **Add Book View Controller**.  
+2.  Choose **Editor > Embed In > Navigation Controller**.
+3.  Name this Navigation Controller "AddBook".
+
+### Add elements to Add Books sceen
+
+Add a Done and Cancel button to the Add Books screen as follows:
+
+1.  In the **AddBook** scene, select **Navigation Item**.
+2.  In the Object Library, drag and drop two **Bar Button Items** to the scene.
+3.  Select each Bar Button Item and in the attribute inspector change their identifiers to "Done" and "Cancel".
+4.  Control-drag the **Done** button to the green exit button below the View Controller. 
+5.  Select **unwindToList** as **Segue Action**. 
+6.  Repeat the above two steps for the **Cancel** button.
+    {% include image.html file="9830446.png" alt="" %} 
+
+### Add new class files
+
+Add a new class for the Add Book ViewController as follows:
+
+1.  In the XCode menu, choose **File > New > File...**.  
+2.  Select **Objective-C class** and click **Next**.
+3.  In the **Choose options for your new file** screen, change **Class name** to "AddNewBookViewController."
+4.  Click **Create** to add two new files to your project: `AddNewBookViewController.h` and `AddNewBookViewController.m`.
+
+### Connect class to View Controller
+
+Connect the AddNewBookViewController class to the View Controller for Add New Book.
+
+{% include image.html file="9830439.png" alt="" %}
+
+Add Text Fields from the Object Library to the Add View Screen. Add one Text Field for each of the five properties: title, author, description, totalPages and genre. Your screen should look like the screenshot below:
+
+{% include image.html file="9830445.png" alt="" %}
+
+To connect the Text fields to your view controller:
+
+1.  Select the **Title** text field in your storyboard.
+
+2.  Control-drag from the text field on your canvas to the code displayed in the editor on the right, stopping at the line just below the `@interface` line in `AddNewBookViewController`.m```.`
+
+In the dialog that appears, for Name, type "titleField."
+
+Leave the rest of the options as they are. Your screen should look like this:
+
+{% include image.html file="9830444.png" alt="" %}
+
+Do the same for the other text fields.
+
+To connect the Done button to your view controller:
+
+1.  Select the Done button in your storyboard.
+
+2.  Control-drag from the Done button on your canvas to the code display in the editor on the right, stopping the drag at the line just below your `textField` properties in `AddNewBookViewController`.m``.
+
+3.  In the dialog that appears, for Name, type "doneButton."
+
+    Leave the rest of the options as they are. Your dialog should look like this:
+    {% include image.html file="9830438.png" alt="" %}
+
+Now add functionality to the class to save the book when the user adds one: 
+
+**AddNewBookViewController.h**
+
+```
+#import <UIKit/UIKit.h>
+#import "ViewController.h"
+...
+```
+
+**AddNewBookViewController.m**
+
+```
+#
+import "AddNewBook.h"#
+import "ViewController.h"#
+define prototypeName @ "books"
+@interface AddNewBook()
+@property(weak, nonatomic) IBOutlet UITextField * titleField;
+@property(weak, nonatomic) IBOutlet UITextField * authorField;
+@property(weak, nonatomic) IBOutlet UITextField * genreField;
+@property(weak, nonatomic) IBOutlet UITextField * descriptionField;
+@property(weak, nonatomic) IBOutlet UITextField * totalPagesField;
+@property(weak, nonatomic) IBOutlet UIBarButtonItem * doneButton;
+@end
+@implementation AddNewBookViewController
+
+  -
+  (void) prepareForSegue: (UIStoryboardSegue * ) segue sender: (id) sender {
+    void( ^ saveNewErrorBlock)(NSError * ) = ^ (NSError * error) {
+      NSLog(@ "Error on save %@", error.description);
+    };
+    void( ^ saveNewSuccessBlock)() = ^ () {
+      UIAlertView * messageAlert = [
+        [UIAlertView alloc] initWithTitle: @ "Successfull!"
+        message: @ "You have add a new book"
+        delegate: nil cancelButtonTitle: @ "OK"
+        otherButtonTitles: nil
+      ];
+      [messageAlert show];
+    };
+    if (sender != self.doneButton) return;
+    if (self.titleField.text.length > 0) {
+      NSLog(@ "%@", self.titleField.text);
+      LBModelRepository * newBook = [
+        [AppDelegate adapter] repositoryWithModelName: prototypeName
+      ];
+      //create new LBModel of type
+      LBModel * model = [newBook modelWithDictionary: @ {
+        @ "title": self.titleField.text,
+          @ "author": self.authorField.text,
+          @ "genre": self.genreField.text,
+          @ "totalPages": self.totalPagesField.text,
+          @ "description": self.descriptionField.text
+      }];
+      [model saveWithSuccess: saveNewSuccessBlock failure: saveNewErrorBlock];
+    } else {
+      UIAlertView * messageAlert = [
+        [UIAlertView alloc] initWithTitle: @ "Missing Book Title!"
+        message: @ "You have to enter a book title."
+        delegate: nil cancelButtonTitle: @ "OK"
+        otherButtonTitles: nil
+      ];
+      [messageAlert show];
+    }
+  }
+  ....(ctd)
+```
+
+Run the build and try it out. You should be able to add a new book and refresh to fetch all books.