objective-c

Xcode (Snow Leopard) project works differently based on declaration of a single variable.

OK, I'm still quite new to Xcode/Cocoa etc, so please forgive me if this issue is something totally obvious, but it seems to me to completely defy any logical software behaviour that I have ever seen. I have a project which uses OpenGL in Snow Leopard. I have created a very basic solid teapot (using glut, obviously) and have shone a lig...

Preventing re-entering observeValueForKeypath recursively when KVO fired from model setter

I have a whole host of models that watch themselves for changes. When a setter is triggered, the observer in the model is called and within that model I make a call to a web server and update information in the web server so it correctly has the data it should. However, in my call to the web server I can get back an error for anything f...

Iphone masking colors: Remove background color

Hi, I have a series of avatars; each has a hot pink background of RGB:255,0,255. Rather than going through every avatar, and manually removing the pink background; is there a way to make Objective C remove the background (masking it) for me? An example of an avatar follows: One thing I am concerned about is that the masking is done...

How to properly return a value from a method and have it available immediately after application loads?

Hello everyone, first post here so sorry for the length of it. I've been lurking and learning a lot so far but now I have to step in and ask a question. I have read numerous posts here as advised in the FAQs, but I couldn’t find exactly the answer I’m looking for. Before anything else, let me just say that I'm a total beginner in progr...

Verify Password Error

NSString *NumberToSave = Number.text; NSString *PassToSave = Password.text; NSString *PassVerify = VerifyPassword.text; // Save Settings NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults]; NSString *tmpNum = [standardUserDefaults stringForKey:@"Number"]; if (tmpNum) { }else{ ...

incrementing c pointers

i am using c pointers in which if i increment as *p++ it increments p but returns only the value which p pointed before it was incremented. how can i increment the value pointed by p. ...

Is it possible to NSLog() without the time and date stamps, and the automatic newline?

Does NSLog() have variants that print without the time and date stamps, and the automatic newline? Thanks. Now with following code, I can print NSString, cString, or objects: #import <Foundation/Foundation.h> #import <stdio.h> int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; ...

Shared NSMutableString for local html filename iphone

I am relatively new to Objective C/iPhone Development. I am developing a simple app with two views using a Navigation controller. The first view contains several buttons a and the second view contains a uiwebview. The idea is that when a button is pressed it switches to the second view and the web view loads a local html file. Which h...

Why does a simple program import <Foundation/Foundation.h> instead of individual header files?

I'm new to Objective-C. The Xcode generated template code has: #import <Foundation/Foundation.h>. When I check it at /System/Library/Frameworks/Foundation.framework/Headers, there are nearly 2 thousands header files! My question is, for a really simple code that use only NSString, why not import just the NSString.h file? Does importing...

UITableView replicating first NSArray Item for all rows...

Hi all, Got a weird problem with my NSMutableArray and UITableView. It's got 4 items in the array, the table shows 4 rows but each rows only contains the first array item, rather than row 1 showing array item 1, row 2 showing item 2, etc... Here's my code: My Mutable Array //in .h NSMutableArray *tableRows; //in .m tableRows = [...

If I override a class method, is there a way I can call the original method (the one that was overridden)?

In Objective-C, if I override a class method using a category, is there a way I can call the original method (the one that was overridden)? ...

Is there an XML example for HTTPRiot and iPhone?

My problem is that I am both new to iPhone development and also to using this HTTPRiot class. The goal is to have a generic XML parser and this class seems to do the trick from the completed demos, but what I haven't been able to find is a barebones implementation tutorial. What I'm not seeing is the delegate methods being invoked on t...

float value changes when passed to a method in objective-c

Ok here goes my situation: I have a core-data generated class Quantity which has one of its attributes 'Value', marked as a float. There's a convenience method in the Quantity class which helps me set this property: - (void)setValueValue:(float)value_ { [self setValue:[NSNumber numberWithFloat:value_]]; } Now when I set try se...

Editing multiple sections of a UITableView at once causes crash.

I have a UITableView with 2 sections. The section 0 contains a list of file names and the user can tap them to toggle the checkmark accessory. This section is also editable so the user can swipe to delete a file/row. The section 1 is not editable and contains 1 row and acts as a button to initiate a transfer of the files. Thus, the da...

Why do I need to cast before a method of an item of a NSArray can be called?

I am fairly new to Objective-C. Currently porting my own library from C#/Java to objective C. I now run into a very strange problem for me. I have a NSArray with several Note objects. I want to transpose on of these notes: //Note.h - (Note *) transpose: (int) semitones; //Main NSArray *notes = [get it from somewhere]; Note *tra...

Mapkit with multi annotation (callout), mapping the next view.

Hi all, Wanted some help with a problem with mapkit I am facing. Should be a silly problem or I have missed out something while going through the mapkit framework. Here is the senario. I am placing multiple annotation on the map when the user performs some search like pizza. Added button for the right annotation view, on click which op...

Can a UIScrollView be adapted to zoom horizontally but not vertically? (how)

I'm trying to make a timeline view that shows events as UIButtons that can be pressed for more info. Ideally I want to lay out the buttons on a UIScrollView, and allow them to stretch/shrink horizontally, but not vertically. What I'm trying to accomplish would basically be equivalent to using pinch gestures to resize the content view, ...

select custom UITableViewCell by Identifier from xib

Hi, I try to fill my UITableView withd different UITableViewCells. I tried to choose 1 of 3 UITableViewCells out of a XIB-file by identifier but I can't get the value of the UITableViewCell's Identifier. - (UITableViewCell *)tableView:(UITableView *)_tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ MyTableViewCell *cell = (...

Open Source Objective-C Math/Calculator engine

Hej guys, I was wondering if you know any well working Math or Calculation engines written in Objective-C? Found a graphing one using CorePlot already.... Thanks for your help! :) ...

Objective-C Library for RSS feed parsing?

I'm looking for an Objective-C library for an iOS app that will parse and display articles form an RSS feed. Specifically,m I'm looking to make an app for a news website. The framework should be able to work with various RSS XML structures if possible. (Well, two different news sites. One uses Wordpress-generated RSS and one does not.) ...