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• Mac OS - Download an save an image file on HDD with Cocoa

  - by Julien

  I'm building a program, and I'm quite confident using Objective-C, but I don't know how to programmatically download a file from the web and copy it on the hard drive. I started with : NSString url = @"http://spiritofpolo.com/images/logo.png"; NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]]; But then I don't know what to do with the data... that sucks, no ;) Can somebody help?

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• @synthesize comma separated list

  - by Frooditz Furs

  Hi, I've read apple's Objective-C doc and am curious about using @synthesize. I've seen classes with a long list of @synthesizes and I've seen classes with one @synthesize then a long comma-separated list of ivars. So what's the difference between: @synthesize ivar1; @synthesize ivar2; @synthesize ivar3; and @synthesize ivar1, ivar2, ivar3; ????

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• Changing Window Title in Interface Builder

  - by Zakman411

  Hi all, I'm new to Objective C and Cocoa - and I'm having a really hard time changing the title on one of my windows. Usually I would press the outside of the window, and then in Window Attributes Inspector there's the title area - however for this particular project it has a name in that box and when I run the application, the title bar still says untitled. Am I missing something? I haven't binded the title to a data source or anything.

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• Are the following data type allocations analagous?

  - by byte

  I'm very interested in languages and their underpinnings, and I'd like to pose this question to the community. Are the following analagous to eachother in these languages? C# Foo bar = default(Foo); //alloc bar = new Foo(); //init VB.NET Dim bar As Foo = Nothing 'alloc bar = New Foo() 'init Objective-C Foo* bar = [Foo alloc]; //alloc bar = [bar init]; //init

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• Touch iPhone/iPod/iPad Transactions

  - by Lennie De Villiers

  Hi, I heard that there are applications that allow people to do transactions by just touching there iPhones to each other. How is that archive via code in Objective C?

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• iPhone SDK development obj-C vs interface builder

  - by Amy

  I'm new to the iOS platform. I'm not clear on the purpose of the interface builder. It looks like I can avoid using it entirely and just write all the code in objective c. am I right? is there anything that IB can do but obj-c cannot? It reminds me of visual basic 6.

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• How get datetime column in sqlite objecite-c

  - by Undolog

  Hi, How do you get a datetime column in sqlite objective-c ? I have a table with 4 fields: pk, datetime, value1 and value 2. pk (primary key), value1 and value2 are integer so I am using: int value1 = sqlite3_column_int(statement, 2); int value1 = sqlite3_column_int(statement, 3); But what should I used for datetime? Thx

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• Size of an Array

  - by Florent

  Hi all ! I'm new in objective C and iphone and it's hard from me. How do you get the size of an NSarray ? ? ? and print it in the console using NSLog ? thanks now it's basic but hard for me.

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• How to add picture in UITableViewCell

  - by Dan

  I'm new to Iphone application development and objective C. I wonder if there is a way to insert a picture in a UITableViewCell - with or without creating a custom cell? I would like to have it positioned at the "second row" in the same way that "cell.detailTextLabel.text" appear. Any suggestions? Thanks in advance.

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• Download an save an image file on HDD with Cocoa

  - by Julien

  I'm building a program, and I'm quite confident using Objective-C, but I don't know how to programmatically download a file from the web and copy it on the hard drive. I started with : NSString url = @"http://spiritofpolo.com/images/logo.png"; NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]]; But then I don't know what to do with the data... that sucks, no ;) Can somebody help?

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• UITableViewCell similar to one in "Things" app

  - by Fiedorowski

  Hi im looking (but cant find) for sample app that will show me how to implement UITableView with custom UITableViewCell that is similar to one in the Things app, with smooth animation from read-only view (that hides empty cells) to editable view that shows only cells that can be edited, and custom cell with multiline input with small image. I would appreciate if someone could point me in the right direction. Im new to Cocoa/Objective-C programming but Im familiar with Object Oriented programing concepts.

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• When to retain a "delegate"

  - by Jose

  I know that in Objective-C you should never retain your delegates because it may cause a retain-cycle, however, how do you know the difference between a delegate and a non-delegate object ? Can't it be said that just sending a message to any object is delegating work to that object ?

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• what is the equipvalent of object in C# for objecitve C?

  - by Wayne Lo

  In c# I can declare object o; then I can assign Obj=(float)5.0; or Obj="a string." Is there an equivalent for objective C? I tried to use id but it does not take primitive type like float or integer. Thanks for helping.

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• Is it possible to write to plist from NSMutableArray?

  - by Emil

  Hello. Is it even possible to write an NSMutableArray to a plist in Objective-C? If so, how? If not, how else? Thanks :)

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• Iphone 3.3 blocks

  - by John Wright

  I am tyring to use Objective C blocks on an iPhone 3.3 app but am getting a linkage error: "_NSConcreteGlobalBlock," referenced from: Any ideas as to whether blocks are supported in the iPhone 3.3 SDK? I found conflicting reports on the internet.

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• call the function(InApp Purchase)

  - by riteshkumar1905

  how can we call the defined function on button action in objective-c on iPhone. for example: we define the function as follow -(void)abc { // } now how can i call this function on the button action

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• Flickr getrecent photo api with objectiveflickr

  - by damniatx

  hi anyone know how to do api request for get recent photo from flickr ?, i'm still new to objective c, if anyone have tutorial or simple example to do it for iphone application that will be great.

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• get iphone window background color

  - by Jonathan

  I've been looking at the Stanford University iphone videos on iTunes U. And saw the teacher trying to do something similar to this code but he realised and said it didn't work though I didn't get why: - (IBAction)flashPressed{ if (window.backgroundColor == [UIColor magentaColor]){ window.backgroundColor = [UIColor redColor]; }else { window.backgroundColor = [UIColor magentaColor]; } } Objective-C, windows based application. Not sure what else you need to know.

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• Useful third-party Object-C GUI add-ons for iPhone development

  - by Nissan Fan

  When I develop in .NET there's lots of UI controls from companies like Infragistics and Telerik that enable me to build above-and-beyond standard usability and stylish GUIs rapidly. Is there anything like that for iPhone Objective-C development?

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• Adding a Main Menu to a Game in Xcode

  - by MasenB

  I am about done with an Objective - C Sprite Kit Development course on Lynda, and I wanted to expand on the app the course had me make! It was made so that once I open the app, it started brick breaker, and then there are more classes for additional scenes like Game Over and Restart! I was wondering if someone could tell me how to make a Main Menu view controller that came before the Brick Breaker screen! Thanks, Masen

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• Display "custom" view (various images, various text). Should I use UIWebView?

  - by aw

  First: No, none of the content should be loaded from the web. All content parts are shipped with the main bundle. I have n images and mass of text (including lists). Instead of building all view parts programmatically in objective-c if was thinking of using an UIWebView and build "only" the HTML dynamically. Does anything speaks against it? How does UIWebView work with local content? Links and resources welcome. Thanks

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• Is "self" necessary?

  - by Rob

  Is using "self" ever necessary in Objective-C or maybe just a good practice? I have gone from using it all the time to not using it at all and I don't seem to really notice any difference. Isn't it just implied anyway?

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• How much does it cost to develop an iphone application?

  - by delooks

  How much can a developer charge for an iphone app like twitterrific. I want to know this because I need such an app with the same functionality for a new community website. I can do Ruby but have no experience with Objective C. So it would be interesting for me if I should start reading books about iPhone programming or outsource the work to a iPhone programmer.

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• Adding procedural C openGL functions to an iPhone project

  - by user309595

  I want to add a few drawing functions to an iPhone project for drawing things. Something like drawTile(x,y,len,wid); which would call openGL to draw a box somewhere. I should just be able to write a procedural C file to do this but the openGL libraries are objective C and I'm getting weird errors. Do I have to make a class for all of my drawing commands and call class methods?

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• Is there an open source depository of custom classes for the Iphone?

  - by Chris Young

  I'm trying to learn Objective-C for xcode. I was wondering if there was an open source depository for custom classes. Things that programmers re-use. ( ie. playing card class, or peer to peer methods ) I've searched google, but so far haven't seen any type of site.

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