iphone

How to add a button to UINavigationBar?

How to add a button to UINavigationBar programmatically? ...

Drawing a texture with an alpha channel doesn't work -- draws black

I am modifying GLPaint to use a different background, so in this case it is white. Anyway the existing stamp they are using assumes the background is black, so I made a new background with an alpha channel. When I draw on the canvas it is still black, what gives? When I actually draw, I just bind the texture and it works. Something is wr...

Pop-up modal with UITableView on iPhone

I need to pop up a quick dialog for the user to select one option in a UITableView from a list of roughly 2-5 items. Dialog will be modal and only take up about 1/2 of screen. I go back and forth between how to handle this. Should I subclass UIView and make it a UITableViewDelegate & DataSource? I'd also prefer to lay out this view in ...

Getting a variable into another class through properties or button tags with Iphone SDK?

Hello. I have been pounding my head against a wall trying to figure out what I think is a simple thing to do, but I have, so far, been unable to figure it out with the iPhone SDK. I have a view with 4 buttons. When I push the buttons, I have another view called and come up to take over the screen. I want to have a simple variable pas...

Debuging to simulator crashes with "exited with status 5" unless I have breakpoint

For some reason the app I am working on has very bad PMT! Literally! Most of the time I cannot debug using the simulator without putting a breakpoint in my AppDelegate. If I don't it exists with "status 5". If I put a break point in and simple continue it works perfectly well, it also works if I run the app in the simulator when not conn...

How expensive is it to create an NSAutoreleasePool

I have a method which needs to run in its own thread 88 times per second (it's a callback for an audio unit.) Should I avoid creating an NSAutoreleasePool each time it's called? ...

Sort by the mode in an Array in Objective-C iPhone

If I have an NSArray with some values in them. Is there a way using descriptors to sort it by the most frequent number in the array first and the least frequent number at the end, Array has( "3", "2", "1", "3", "3", "7", ) to Array has( "3", "3", "3", "1", "2", "7", ) ...

Prompting user for multiple selections in an iphone app

I'm currently looking for a way to provide the user with being able to select multiple items from a collection of values. I know this is done in the mail app whereby you can go into the edit mode of a folder and select multiple items by clicking on the circle on the left hand side. What I'm unsure about is how this is achievable. Is an...

Compiling GData for iPhone

Hi, I'm trying to compile a project that uses the GData objective-c framework. I've successfully compiled and run the project under the 'Debug' configuration, but when I try to compile using 'Release' and now 'Adhoc' I get the following errors. NOTE: I duplicated the debug configuration for adhoc and that doesn't seem to help. "_kGData...

What is the event for ASIHTTPRequest to get the http header?

I have checked the source codes of ASIHTTPRequest and could not make sure which one is. Thanks interdev ...

viewDidLoad not being called by parent UITabBarController

Sample: I've created a minimal set of files that highlight the issue here: http://uploads.omega.org.uk/Foo3.zip If viewDidLoad/viewInitWithNibName are called, a message box is displayed. The message box is not displayed, therefore, the methods are not being called. Details: I have an application that is attempting to use a UITabBarCon...

Is there a better way to deal with reserved characters when parsing XML/JSON data on the iPhone?

The following code works, but it's ugly and creates a bunch of autoreleased objects. I'm using similar code for parsing reserved HTML characters as well (for quotes, & symbols, etc). I'm just wondering... Is there a cleaner way? NSString *result = [[NSString alloc] initWithString:userInput]; NSString *result2 = [result stringBy...

How to convert a UTC date to NSDate?

I have a string that is UTC and would like to convert it to an NSDate. static NSDateFormatter* _twitter_dateFormatter; [_twitter_dateFormatter setFormatterBehavior:NSDateFormatterBehaviorDefault]; [_twitter_dateFormatter setDateFormat:@"EEE MMM dd HH:mm:ss ZZZ yyyy"]; [_twitter_dateFormatter setLocale:_en_us_locale]; NSDate *d = [_twi...

Change the text of a UILabel in viewDidLoad() programmatically

Hi everybody. I'm a beginneri iPhone developer. My code is the following: - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) { displayLabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 20, 230, 40)]; [self.vie...

is there an equivalent to a "Focus Listener" in Objective-C or iPhone SDK? (Coming from Java)

Hello. I am a student programmer who has taken up Objective-C on my free time as my college doesn't teach it. We have only used Java and basic C so far. I am in the middle of making a program for the iPod and was wondering if there was any type of way to call a method in a class similar to the way a Focus Listener does in Java? I hav...

UIButton not being clicked in iPhone programming.

Hello, I've created a UIButton on a view and on action of the UIButton[UIButton* button1_obj] one more button[UIButton* button2_obj] is created on same view. i'm facing these 2 issues...please guide me how to proceed. button1_obj is appearing when i run my project, but its not being clicked or highlighted, nor any exception is thrown...

NavBar displaying back twice when app changed to landscape mode

Hi, Not sure what's going on here, but my iPhone apps nav bar shows back and the title of my detail view controller even when I'm back to the original view. It wasn't happening earlier, it has changed recently (but not sure when exactly). E.g. I click on a row, view the didSelectRow XIB and then click back on the NavBar controller, but...

How can we change color of a text programmatically ?

My code is -(UIImage *)addText:(UIImage *)img text:(NSString *)text1 { int w = img.size.width; int h = img.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextDrawImage(cont...

Best way to set-up an iPhone project?

Looking for the best way to set-up an iPhone project in XCode ... namely: What is the preferred project template to start with (e.g View-Based or Windows-Based application)? What folder structure should I create in XCode to manage the project? For example, under "Classes" is it a preferred practice to add Models, Views and Controllers...

reloadData not working - suspect cell's reuseIdentifier

I have a view controller that gets presented modally and changes some data that effects the data in a uitableview in the modal's parent view controller (a table view). I call the tableview's reloadData method when the parent view reappears. I have confirmed that this code gets hit with a break point. My trouble is, reloadData isn't work...