subclass

I'm trying to subclass UIImageView to add some custom functionality in it. I started trying to do the basics, just init an object with a given image and display it on the screen. Using UIImageView everything works fine, but if i change my object from UIImageView to my custom class, no image is displayed. Here's what i've done so far: //Imager.h #import <UIKit/UIKit.h> @interface Imager : UIImageView { } -(id) init; -(void) retrieveImageFromUrl: (NSString *)the_URL; @end //Imager.m #import "Imager.h" @implementation Imager @synthesize image; -(id)init { self = [super init]; return self; } -

RELEVANT INFORMATION: I have a subclass procedure that needs to validate the content of the clipboard before it gets pasted. I have managed to get the content of the clipboard successfully, at least I think so. QUESTION: I do not know how to construct the following if statement ( the following is pseudo code ): if( clipboard content is OK ) defaul handler; else discard message; MY EFFORTS TO SOLVE THIS: So far this is what I have in mind: LRESULT CALLBACK Decimalni( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData ) { switch (message) { case WM

I have two classes, public class BookItem { public string BookID { get; set; } public string ItemID { get; set; } public Item Item { get; set; } public ItemType Type { get; set; } public string ParentID { get; set; } public string BoxID { get; set; } public string StyleID { get; set; } public string NotesID { get; set; } public string Code_XAML { get; set; } public string Description_XAML { get; set; } public CompositeCollection SubItems { get; set; } } public class Item : ClaunchBaseClass { public string ItemID { get; set; } public int Type { get; set; } public string Code { get; set; }

What is the difference beetween : // 1 -(id) init { self = [super init]; if (self) { ... do init .... } return self; } // 2 - I guess it's exactly the same as previous -(id) init { if (self = [super init]) { ... do init .... } return self; } // 3 - is this one a really bad idea and if yes, Why ? -(id) init { self = [super init]; if (!self) return nil; ... do init .... return self; } // 4 - I think this one sounds OK, no ? But what is returned... nil ? -(id) init { self = [super init]; if (!self) return self; ... do init .... return self; } EDIT : Added thanks to Peter M. // 5 - I really like

I have a Model Property which has subclasses using STI, and which I would like all to use the same controller with only different view partials depending on the subclass. Property Restaurant < Property Landmark < Property It works find except I'm not sure how to discern the subclass inside the controller to render the correct view. Ie. /restaurants works and goes to the properties controller but I can't tell that they want the Restaurant subclass? map.resources :restaurant, :controller => :properties map.resources :properties Tomas Markauskas A simple way to fi the problem would be to create a

I am trying To subclass My UITableViewDatasource, However My App Crashes with EXC_BAD_ACCESS. No explanations no error messages just crashes. A Sort Version of my DataSource Looks Like This. import UIKit class DataSource :NSObject, UITableViewDataSource{ var tableView:UITableView let CellIdentifier = "Cell" init(tableView : UITableView) { println("Data Source") self.tableView = tableView super.init() self.tableView.dataSource = self } //:MARK UITableViewDataSource //-----------------------------------------------------------------------------------------// // Number Of Rows In Tableview //----

i have 2 classes, called superclass and subclass, i tried to cast the subclass object to superclass, but its seems does not work when i want to use the subclass object from the superclass. Please help to explain. Thanks. These are the code:- public class superclass { public void displaySuper() } System.out.println("Display Superclass"); } } public class subclass extends superclass { public void displaySub() { System.out.println("Display Subclass"); } } public class Testing { public static void main(String args[]) { subclass sub = new subclass(); superclass sup = (superclass) sub; when i tried

Maybe its something stupid, but I'm having a problem with a subclass of a DataGridView Control in VS2005 C#. I know I can subclass from almost anything by doing public class MyDataGridView : DataGridView {} no problem, and I put in some things / elements I want applicable globally. Now, I take this gridview and put into a custom user control that will contain other controls too. So I have something like created by the visual designer. I grab some buttons, label, and my derived "MyDataGridView" on it. public partial class MyCompoundDGVPlus : UserControl So, now, I can visually draw, move,