What is the difference between a View and a View Controller?
from an iphone development perspective ...
objective-c
UITableView loading before variables being set
I have a label on a UITableView. When clicked it will refresh my tableview and set the top cell's height. When I am setting the cell height, I am checking if a certain variable is TRUE. If true it will show the large height, if false, the smaller height. At the time of cell height creation, my variable is always false. It is a member va...
NSNumberFormatter, how to remove blank spaces in currency symbol
I'm having some values that I need to format into a currency string. It seems that when using NSNumberFormatter to format an amount, the resulting currency string will contain one or more blank spaces. For instance using the following piece of code to format @"1000" into the European currency format will result in returning @"1,000,00 €...
Deal with an edit to a contact within ABPersonViewController
I've got an iPad app that displays information about the contact in a ABPersonViewController displayed within an UINavigationController, within a popover. When the user hits the Edit button and edits the values, then presses Done, I'd like to update my UI if there are any changes that might affect it. I've tried implementing ABAddressBo...
How does an NSTextField know that it's value has changed?
I have a textfield that can either be edited by hand, or set through another control. (It's a page number, so you can jump to page 16 by typing in 16, or you can page up and down with the next/prev buttons) I have the value of the text field bound to an int page variable. It seems to work correctly, when you type a page number in, it ju...
Background color remaining when switching views
Hi Guys. I have a UIViewController named equationVC who's user interface is being programmatically created from another NSObject class called equationCon. Upon loading equationVC, a method called chooseInterface is called from the equationCon class. I have a global variable (globalVar) that points to a user defined string. chooseInterfac...
Accessing a database through Obj-c
Hey, I am trying to find some source code on how to access and store variables from a database to my program via obj-c(iPhone). I have look for many hours now and no one has provided a sure fire way on how to go about this. If you have any advice or recommendations please post some source code or a link to it. Thanks for the help. ...
Objective-C - Adding sound on iPhone
I'm making a sound for the iPhone and I'm interested in adding background music and background sounds. Is CoreAudio right for the job? And if so, how do I use it? ...
Pixel-Position of Cursor in UITextView
Hello, is there a way of getting the position (CGPoint) of the cursor (blinking bar) in an UITextView (preferable relative to its content). I don’t mean the location as an NSRange. I need something around: - (CGPoint)cursorPosition; It should be a non-private API way. Thanks, Raphael ...
Port iPhone application to Android
What is the most efficient way to port an iPhone app to Android? I know Apple doesn't like 3rd-party, non-Objective C platforms generating code for their platform ... but is there something out there that can take an iPhone app and convert it to Android friendly code? If not, how have folks out there been creating Android versions of t...
Generate a random alphanumeric string in cocoa
Hey there, I know this can't be that hard. I've searched, but I can't seem to find a simple solution. I want to call a method, pass it the length and have it generate a random alphanumeric string. Any ideas? Are there any utility libraries out there that may have a bunch of these types of functions? Thanks, Howie ...
iPhone SDK / Objective C Syntax Question
To all, I was looking at the sample project from http://iphoneonrails.com/ and I saw they took the NSObject class and added methods to it for the SOAP calls. Their sample project can be downloaded from here http://iphoneonrails.com/downloads/objective_resource-1.01.zip. My question is related to my lack of knowledge on the following s...
Basic Objective-C syntax: "%@"?
Hi, I'm working through the Stanford iPhone podcasts and have some basic questions. The first: why is there no easy string concatenation? (or am I just missing it?) I needed help with the NSLog below, and have no idea what it's currently doing (the %@ part). Do you just substitute those in wherever you need concatenation, and then comm...
How To Draw More Precise Lines using Core Graphics and CALayer
Hello I am having a hard time making this UI element look the way I want (see screenshot). Notice the image on the right--how the line width and darkness looks inconsistent compared to the image on the left (which happens to be a screen grab from safari) where the border width is more consistent. How does apple make their lines so perfec...
Looking for voice command code/library for obj-c/c
C/Obj-C Developers- I am looking for a way to listen for a specific word or small set of words to be spoken and fire an event. Needs to be able to run on the iPhone/iPad ... Looking for ideas? ...
creating managed objects using code in xcode & core-data
New to objective-c xcode and core-data so sorry for the remedial question. I have set up a very simple data model: Entity1 and Entity2, both contain a single attribute (String) and a one-to-many relationship with the other. I want to scan Entity1 and depending on the results of the scan create one or more Entity2 objects that link to...
How do I draw a proper parallelogram that can be animated on iPhone?
I'm trying to do something very simple: I need some parallelograms in my program. These are attached to other objects, all of which are UIViews. It's important that I be able to animate these, since the objects they are attached to can also be animated. I've figured out how to use the transform in UIView/CALayer to do this, but the prob...
How to handle float values in a plist
I'm reading in a plist from a web server, generated with some php. When I read that into an NSArray in my iphone app, and then spit the NSArray out with NSLog to check it out, I see that the float values are treated as strings. I would like the "distance" values to be treated as numeric and not strings. This plist is displayed in a ta...
NSFetchedResultsControllerDelegate in a second view controller (not firing?)
I am running into an issue similar to the one described here: http://stackoverflow.com/questions/1319940/nsfetchedresultscontrollerdelegate-not-firing (the delegate for my NSFetchedResultsControllerDelegate are not being called on my second view controller) I can't seem to get the proposed solutions to work. I have a main view that load...
iPhone: UILabel applying CGAffineTransformMakeRotation causing mysterious crash
In -(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil parentController:(GameViewController *)myGameController{ Have a series of transforming labels like so: deg90 = 1.570796326794897; //....transforms background.center = CGPointMake(160,230); background.transform = CGAffineTransformMakeRotatio...