Databases
StackOverflow2013
Postsdbo
PO"Your Second iOS App": How do I implement a Singleton?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO"Your Second iOS App": How do I implement a Singleton?
    primarykey
    data
    text
    <p>I am still trying to improve <a href="http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/SecondiOSAppTutorial/Introduction/Introduction.html" rel="nofollow noreferrer">"My Second iOS App"</a>, which is a tutorial provided by Apple. Here is a picture of the storyboard with added commentary of what should happen.</p> <p><img src="https://i.stack.imgur.com/5W0mo.png" alt="detail of the storyboard with added commentary"></p> <p>When the done button (step 3) is clicked, the actual screen should return to the main menu (3.a) while the finished BirdSightingObject should be added to the list of <code>BirdMasterViewController</code> (3.b). So I figured that I could use a Singleton, since there could be only one object added simultaniously and it makes accessing from different classes much easier.</p> <p>In the tutorial a class is already given for data handeling, "<code>BirdSighting</code>", which could probably be used as a singleton. But as I have only beginner level knowledge of OOP and design patterns I don't know, if I can use this, or if I have to to write my own in reference to the existing class.</p> <p>And secondly: I haven't the slightest idea how to access the <code>BirdMasterViewController</code> in the <code>(IBAction)done</code> method to finally save the object in the list.</p> <p><sup>Note: The following source code is partially provided by Apple, Inc. Refer to <a href="http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/SecondiOSAppTutorial/CodeListings/CodeListings.html" rel="nofollow noreferrer">this</a> to see a full code listing of the tutorial. No copy right infridgement is intended.</sup></p> <p><code>BirdSighting.h</code>:</p> <pre><code>@interface BirdSighting : NSObject @property (nonatomic, copy) NSString *name; @property (nonatomic, copy) NSString *location; @property (nonatomic, strong) NSDate *date; - (id)initWithName:(NSString *)name location:(NSString *)location date:(NSDate *)date; - (id)initWithNameOnly:(NSString *)name date:(NSDate *)date; @end </code></pre> <p><code>BirdSighting.m</code>:</p> <pre><code>#import "BirdSighting.h" @implementation BirdSighting - (id)initWithName:(NSString *)name location:(NSString *)location date:(NSDate *)date { self = [super init]; if (self) { _name = name; _location = location; _date = date; return self; } return nil; } -(id)initWithNameOnly:(NSString *)name date:(NSDate *)date { self = [super init]; if (self) { _name = name; _date = date; return self; } return nil; } @end </code></pre> <p>The <code>(IBAction)done</code> method, in <code>MainMenuViewController.m</code>:</p> <pre><code>- (IBAction)done:(UIStoryboardSegue *)segue { if ([[segue identifier] isEqualToString:@"ReturnInput"]) { AddLocationToSighting *addController = [segue sourceViewController]; if (addController.birdSighting) { [self.dataController addBirdSightingWithSighting:addController.birdSighting]; [[self tableView] reloadData]; } [self dismissViewControllerAnimated:YES completion:NULL]; } } </code></pre> <p>Summary:</p> <ul> <li><strong>May I transform</strong> <code>BirdSighting</code> <strong>into a singleton?</strong> And if so, what is missing? (No need to code it out for me, I hope I can do it on my own if you provide a hint.)</li> <li><strong>How do I save the object in the</strong> <code>BirdMasterViewController</code><strong>?</strong> I have no idea how to access the noninvolved ViewController in <code>(IBAction)done</code>.</li> </ul>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USRNelke
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PO"Your Second iOS App": How do I implement a Singleton?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO"Your Second iOS App": How do I implement a Singleton?
      1. This table or related slice is empty.
      1. VTDownMod
    3. VO
      singulars
      1. PO"Your Second iOS App": How do I implement a Singleton?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COP.S.: If my question is to specific, or if I should separate the two questions, please let me know. I'm also quite new to Stackoverflow.
      singulars
      1. PO"Your Second iOS App": How do I implement a Singleton?
      1. USRNelke
    2. COi guess people here dont allow to help other, whether they can help or not. Good luck @RNelke
      singulars
      1. PO"Your Second iOS App": How do I implement a Singleton?
      1. USDipen Panchasara
    3. CO@DipenPanchasara What we don't allow is answers that are of a low enough quality that they may be considered worthless to the asker of the question. This site is not about wading through cruft, it's about putting quality answers and questions out where everyone can see them and learn from them. I didn't mean to be rude down there, it's just that we expect a higher quality of post around here.
      singulars
      1. PO"Your Second iOS App": How do I implement a Singleton?
      1. USCodaFi
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload