Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>There are more ways on how to approach this - depending on what exactly you would like to achieve.</p> <p>If this methods are tied with U<code>IViewController</code>'s life and data you would probably want to subclass <code>UIViewController</code> or make an <code>UIViewController</code> category.</p> <p><strong>A: Subclassing</strong> (you want to add some custom properties, variables, methods or you want to override a method):</p> <p><strong>MySubclassedViewController.h</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface MySubclassedViewController : UIViewController @property (copy) NSString *myVerySpecialString; -(void) myVerySpecialMethod; @end </code></pre> <p><strong>MySubclassedViewController.m</strong></p> <pre><code>#import "MySubclassedViewController.h" @implementation MySubclassedViewController -(void) initialization { self.myVerySpecialString = @"initialized"; } - (id)initWithCoder:(NSCoder*)aDecoder { self = [super initWithCoder:aDecoder]; if (self) { [self initialization]; } return self; } - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self initialization]; } return self; } - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { [self initialization]; } return self; } -(void) viewDidLoad { [super viewDidLoad]; [self myVerySpecialMethod]; } -(void) myVerySpecialMethod { if ([self.myVerySpecialString isEqualToString: @"initialized"]) { self.backgroundColor = [UIColor yellowColor]; } } @end </code></pre> <p><strong>B: Category</strong> (you just want to add some extra method to a class):</p> <p><strong>UIViewController+SpecialCatrgory.h</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface UIViewController (SpecialCategory) -(void) myVerySpecialMethod; @end </code></pre> <p><strong>UIViewController+SpecialCatrgory.m</strong></p> <pre><code>#import "UIViewController+SpecialCatrgory.h" @implementation UIViewController (SpecialCategory) -(void) myVerySpecialMethod { self.backgroundColor = [UIColor yellowColor]; } @end </code></pre> <p><strong>C: Dedicated helper class</strong></p> <p>On the other hand if you find yourself using some independent method on more than one place you might want to consider writing up a helper class and use it as a singleton. </p> <p><strong>MyHelperClass.h</strong></p> <pre><code>@interface MyHelperClass : NSObject + (instancetype)sharedHelper; -(NSString *) myVerySpecialMethod; @end </code></pre> <p><strong>MyHelperClass.m</strong></p> <pre><code>#import "MyHelperClass.h" @implementation MyHelperClass + (instancetype)sharedHelper { static MyHelperClass *_sharedHelper = nil; static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ _sharedHelper = [[MAConnectionClient alloc] init]; }); return _sharedHelper; } -(NSString *) myVerySpecialMethod { return @"a result from your very special method"; } @end </code></pre> <p>You use it simply by importing <code>MyHelperClass.h</code> (or putting it in <code>-Prefix.pch</code>), without explicitly creating an instance. For example:</p> <pre><code>NSString *someString = [[MyHelperClass sharedHelper] myVerySpecialMethod]; </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POHow can I make one procedure and utilize it in all my view controllers?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USRok Jarc
    1. USRok Jarc
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow can I make one procedure and utilize it in all my view controllers?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COCan you explain the idea behind the sharedHelper method in the MyHelperClass.m file? What is the reason for it? Can you explain it? It's a lot to ask but it'd be a big help.
      singulars
      1. PO
      1. USSonOfSeuss
    2. COIt is created and used as a singleton. It might not be the best approach for your problem (you didn't provide much data on what kind of method you want to use). I typically use one such singleton as a DataModel [example](http://stackoverflow.com/a/16199974/653513) (object that hold all the data for my app). You might want to use one to hold some independent helper methods (methods that don't rely on any special class/object). It's beauty is that it creates it self when you first call it and it is available from any place of your code.
      singulars
      1. PO
      1. USRok Jarc
    3. COIf the method you want to use is really something that has to do with UIVIewController then choose between solution A or B. C is mentioned more as an extra :)
      singulars
      1. PO
      1. USRok Jarc
 

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