iphone

how to implement/calculate this function in objective c?

CUMIPMT(Rate,NumberOfPayments,PresentValue,StartPeriod,EndPeriod,Type).? plz tell me a step by step guide how this formula works. ...

How can I make a class with only class methods, that is capable of remembering values? How does Core Animation do that?

I have some useful methods for physics calculations like acceleration / deceleration, speed, and some more. Most of them require at least two measurements asunder in terms of time. So every time I want to use them, I have to implement a bunch of instance variables in my object that needs the calculation, for example for calculating an a...

is audio feedback fades the music in and out in iphone OS ?

The music will fade out for the audio feedback to be heard and then music will fade back in after the feedback is ended. (much like when you receive a call while listening to music). can any one suggest me how to write the program for above case in iphone OS. it is very helpful for me if any one provide me the sample code. ...

Memory leaks in image creation function

Hi, I am currently working on an iPhone game, and need to create some animation on the fly. The animation is based on several images, and as the range of image combinations is too large and it is impossible to pre-create all of sequences, I'd like to be able to recalculate a set of images every time the situation changes. The function ...

iPhone - creating a loading view

When the app is in one view controller, I want to add a view to simulate that data is being loaded when I click my tab bar controller to open another view controller. Example: When I the app is in the recorder-view, I want it to show a loading view (a view with a activity indicator) when I change to the list of recorded files (which can ...

iphone cocoa : how to drag an image along a path

I am trying to figure out how can you drag an image while constraining its movement along a certain path. I tried several tricks including animation along a path, but couldn't get the animation to play and pause and play backwards - so that seems out of the question. Any ideas ? anyone ? ...

iPhone application development adding subview in viewbased application

I am having a scrollview and above the scrollview am having 6 view(6 subviews over the scrollview)each views have lables.How to add all these views in to my application am used interface builder to design these view. ...

How can I decode data with Base64 in IPhone

Hi My friend is using Base64 encoding standard in java. I am using IPhone how can I decode the data. and viceversa. There is org.apache.commons.codec.binary.Base64.decodeBase64 in java Thanks Deepak ...

UIScrollView contentOffset jumps after animation - in 3.0 beta 5

I have a UIScrollView with a few UITextFields on it. When the user edits a text field it scrolls so that the UITextField is centered. The problem I am running into is that the UIScrollView is scrolling to the correct spot but at the last frame of the animation it is jumps to 300,300. It works fine in 2.2.1 but not in 3.0 beta 5. It alway...

How do you use the different Number Types in Objective C

So I am trying to do a few things with numbers in Objective C and realize there is a plethora of options, and i am just bewildered as to which type to use for my app. so here are the types. NSNumber (which is a class) NSDecmial (which is a struct) NSDecimalNumber (which is a class) float/double (which are primitive types) so e...

AudioQueueNewInput decreases playback volume for AVAudioPlayer

I am using Stephen Celis' SCListener class to record iPhone microphone audio levels. I also am playing audio through the use of AVAudioPlayer. For example, the user presses 'Play' to kick off a sound playing in the background and then has the option to blow into the microphone to play additional, shorter sounds. The code all works fin...

Problem with UIActivityIndicatorView on iPhone

I want to show UIActivityIndicatorView on my iphone when it changing the view. I have written the following code: - (void)viewDidLoad { spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; [spinner setCenter:CGPointMake(320/2.0, 460/2.0)]; // I do this because I'm in la...

Force shutdown of iPhone

Hi guys, Is it possible to force the iPhone to shutdown (programmatically, of course)? Thanks in advance! ...

Change iPhone navigation bar's height

Hi! My client can't read iPhone's deafault fonts, the size is too small. I have an application with a navigation bar and I need to make everything in it bigger, for example, the font's size. IB doesn't seem to allow this... any help? Many thanks! ...

iphone application

hi everybody I am new to iphone application development i want to add a subview in a viewbased application... i am having scrollview above that am having views containg labels.. and i used Interface Builder to design these views please somebody can guide me how to bring the subview over the scroll view ...

How to determine an invalid CFSocket

Hi Everyone, how can I avoid, to send data via CFSocketSendData to an invalid socket? I've try to determine the socket state with CFSockerIsValid, but this method returns still true when the other side is close. So how can I determine if the socket is valid? In order so avoid Errors. Thank Chris ...

Where are the headers for libbz2.dylib for the iPhone?

The headers for libbz2.dylib on the iPhone are missing, or contained in a less than obvious location. I've looked for bzlib.h, bz2lib.h, bz2.h, etc., grepped for patterns, and found nothing - are they included with the SDK, or do I need to just pull the header from the main libbz2 distro and use that instead? ...

Best way to stream MP3 from an iPhone app?

I am working on an application that will stream music from a server of mine from an iPhone application. This is my first iPhone app so I am a bit confused : What would be the best way to do this? Is there something already built in that I could use, like a MP3 player that I just need to point toward the correct server? Do I need a s...

Where to look at when it comes to iPhone documentation?

I am starting to get into iPhone development, and I find it very hard to get documentation. Where can I find a complete API, tutorials, forums and so on? I know that apple released some tutorials, are they helpful? Is there some kind of "iPhone dev 101" post somewhere that I should absolutely read? Anything will help. ...

Unable to setObject:forKey: in NSMutableDictionary

I'm sure I'm missing something obvious here in a simple iPhone program I'm trying to write, but the code seems so basic that I can't see what's wrong. I'm trying to use an NSMutableDictionary to store a list of classes and their associated save file names. In the header file I declare the dictionary @interface ClassList : UITableViewC...