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• iPhone Twitter Get UserId

  - by Mick Walker

  Hi, I am looking for a way to get a twitter users userid via their username. For example take http://twitter.com/AlySSa_miLAno (yes I know her twitter page off by heart lol) on the right hand side of the page is a link to her RSS feed: feed://twitter.com/statuses/user_timeline/26642006.rss In this context Alyssa's userid would be 26642006. Ideally I would like to avoid reading the full content of the page, as this could be quite expensive on a mobile device, so if anyone knows how to accomplish this using any Twitter/3rd party webservices that would be great.

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• Heterogeneous NSTreeController

  - by andyvn22

  I have an NSTreeController (supplying content to an NSOutlineView). I'd like the top-level objects to be of one class, and all other objects (so, children at any level) to be of another. What's the best way to go about this? I'll need to somehow change the behavior of at least add, addChild, insert, and insertChild, I suppose. I was hoping, though, to find a simple way to account for this in only one location, rather than changing four separate methods.

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• How to change a UIBarButtonItem in a UINavigationBar

  - by pkulak

  I'm trying to set up a list of items that can be edited. I have a main view, with a UINavigationBar at the top and a UITableView directly under it. I'd like to have my "edit" button change to a "done" button on click, but I can't figure out how to do it. If I could do it in the code (not it interface builder), I could just replace it, but I can't even do that. I've seen some code using [self.navigationItem], but in my case self is a UIView. It also feels a bit odd to be using a UINavigationBar when I don't want navigation (this is one page only), but I want a toolbar with a title and and a button, so I don't think really have a choice.

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• How to do iPad Photos app pinch to expand

  - by Macatomy

  I don't think this has been asked before on this site, but I might be wrong. Does anyone know the basics of how to get that whole effect with the iPad Photos app? Basically, pinching a stack of photos lets you have a "peek" at the photos in that stack, which expands based on the distance between your 2 fingers in the pinch, then fully completing the outwards pinch gesture opens the photos in the stack in a new view. See this video to get what I mean. I know of at least one third party app that uses the same method as the iPad Photo app, so I know it's possible to do. I'm guessing I would do something with UIPinchGestureRecognizer but I'm not sure exactly how to proceed.

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• how to run my iphone 2.0 app in iphone os 2.0 and also 3.0 and above os

  - by Rahul Vyas

  i have iphone with os ver. 2.0 i read that for app store all appplication must be run 3.0 os.so how could i make my application to run in both firmware.is there a way i can detect if os ver.3.0 then run different statments alse run statments for lower than 3.0 os.currently i am using this. #if __IPHONE_3_0 cell.textLabel.text=cellValue; [cell.textLabel setFont:[UIFont systemFontOfSize:15.0]]; [cell.textLabel setLineBreakMode:UILineBreakModeTailTruncation]; #else cell.text=cellValue; [cell setFont:[UIFont systemFontOfSize:15.0]]; [cell setLineBreakMode:UILineBreakModeTailTruncation]; #endif will it run on both firmware i want to make my app to be run on =3.0 os and lower than this...please help me how do i check my application for deprecated methods...i can only see this line as deprecated cell.text=cellValue; is there anything to change.i have installed new sdk named iphone_sdk_3.0__leopard__9m2736__final.dmg

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• URLCache - iPhone SDK

  - by Kevin

  Hello everyone.. I need some help in using the NSURLCache to download a simple file. It would need to be saved in the Documents folder of the app. I have seen the URLCache example that apple presented, but I didn't find it useful since it was an image that was being shown. In addition there was some complex code on the modification date. I actually need something when the application opens it will begin the download process. Can someone guide me through just the download process of any file? Thanks Kevin

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• How to use the default background image for iPhone UIView?

  - by RexOnRoids

  How can I use the default background image for a UIView?

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• Detecting iPhone camera orientation

  - by Stephen Petschulat

  I'm getting inconsistent results depending on whether I get the image directly from the camera in the callback or choosing it from the camera roll. In the UIImagePickerControllerDelegate callback method, the UIImage.imageOrientation comes up as UIImageOrientationRight no matter how the photo is taken. When reading it off the Camera Roll, a landscape shot (turned left) comes up UIImageOrientationUp while a portrait shot comes up UIImageOrientationRight. How can I reliably get the camera orientation in both situations?

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• UITableView titleForHeaderInSection prints headers to console twice then crashes

  - by joec

  In the method below titleForHeaderInSection, for some reason the NSLog prints out the headers twice and then the app crashes in objc_msgSend. I can't understand why this would cause the app to crash? It would seem from research that crashes in objc_msgSend are caused by sending messages to already freed objects, but is that the case here? My sectionNames array is populated in viewDidLoad. - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { NSString *title = nil; title=[sectionNames objectAtIndex:section]; NSLog(title); return title; } Thanks

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• Any example on how to implement the new VerificationController and the KNOWN_TRANSACTIONS_KEY constant?

  - by Carles Estevadeordal

  I've been looking at implementing the new VerificationController to verify in-App-Purchases: http://developer.apple.com/library/ios/#releasenotes/StoreKit/IAP_ReceiptValidation/_index.html And I wonder if there is some example anywhere en how to validate a transaction, since it seems that the - (BOOL)verifyPurchase:(SKPaymentTransaction *)transaction; is not enough and it has to be implemented internally to verify the purchase when the data form the server is received. Another question is if anyone has a clue on what the KNOWN_TRANSACTIONS_KEY is and how to fill it, is it just the product id of the purchase?

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• Where's the iPhone MIME type database?

  - by Matt Erickson

  I have a program for the iPhone that is supposed to be doing intelligent things given a list of filenames. I'm looking for the iPhone take on something like /etc/mime.types or something similar. Does this exist?

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• Cocoa Touch & Sql Server

  - by kim3er

  Is it possible to connect to Sql Server for the purpose of executing simple Sql commands within a native iPhone app? If so, how does one go about it? I'm stumped. More generally, I would at least like to see how this is done with GCC. Thanks in advance, Rich

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• RSS Detector in NSXMLParser

  - by Alexandre Cassagne

  How do I use NSXMLDetector to find RSS links in HTML files, the tags in the source are like so : <link rel="alternate" type="application/rss+xml" title="CNN - Top Stories [RSS]" href="http://rss.cnn.com/rss/cnn_topstories.rss"> <link rel="alternate" type="application/rss+xml" title="CNN - Recent Stories [RSS]" href="http://rss.cnn.com/rss/cnn_latest.rss"> I need this in order to automatically detect RSS links in a RSS app. Thanks !

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• CFNetwork / NSURLConnection leak

  - by JK

  Running instruments on the device, I intermittently incur a memory leak of exactly 3.5 KB in CFNetwork, the responsible frame being "HostLookup_Master::HostLookup...." I have read a number of questions re this issue and have separately tried the following to fix the leak: Included the following in applicationDidFinishLaunching: NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil]; [NSURLCache setSharedURLCache:sharedCache]; [sharedCache release]; Specified in the urlrequest not to load from the local cache. None of the above worked. My class that instantiates the connections does not leak as its instances are released when data has been downloaded. I have verified this by confirming the the living objects of the class is 0 using Instruments. Any advice on addressing this leak would be greatly appreciated.

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• Implementing A Static NSOutlineView

  - by spamguy

  I'm having a hard time scraping together enough snippets of knowledge to implement an NSOutlineView with a static, never-changing structure defined in an NSArray. This link has been great, but it's not helping me grasp submenus. I'm thinking they're just nested NSArrays, but I have no clear idea. Let's say we have an NSArray inside an NSArray, defined as NSArray *subarray = [[NSArray alloc] initWithObjects:@"2.1", @"2.2", @"2.3", @"2.4", @"2.5", nil]; NSArray *ovStructure = [[NSArray alloc] initWithObjects:@"1", subarray, @"3", nil]; The text is defined in outlineView:objectValueForTableColumn:byItem:. - (id)outlineView:(NSOutlineView *)ov objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)ovItem { if ([[[tableColumn headerCell] stringValue] compare:@"Key"] == NSOrderedSame) { // Return the key for this item. First, get the parent array or dictionary. // If the parent is nil, then that must be root, so we'll get the root // dictionary. id parentObject = [ov parentForItem:ovItem] ? [ov parentForItem:ovItem] : ovStructure; if ([parentObject isKindOfClass:[NSArray class]]) { // Arrays don't have keys (usually), so we have to use a name // based on the index of the object. NSLog([NSString stringWithFormat:@"%@", ovItem]); //return [NSString stringWithFormat:@"Item %d", [parentObject indexOfObject:ovItem]]; return (NSString *) [ovStructure objectAtIndex:[ovStructure indexOfObject:ovItem]]; } } else { // Return the value for the key. If this is a string, just return that. if ([ovItem isKindOfClass:[NSString class]]) { return ovItem; } else if ([ovItem isKindOfClass:[NSDictionary class]]) { return [NSString stringWithFormat:@"%d items", [ovItem count]]; } else if ([ovItem isKindOfClass:[NSArray class]]) { return [NSString stringWithFormat:@"%d items", [ovItem count]]; } } return nil; } The result is '1', '(' (expandable), and '3'. NSLog shows the array starting with '(', hence the second item. Expanding it causes a crash due to going 'beyond bounds.' I tried using parentForItem: but couldn't figure out what to compare the result to. What am I missing?

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• How to get HDD volume id programmatically?

  - by Leandro

  Hi, everybody. I`m programming in obj-c using cocoa, and I would like to discover the HDD volume id programmatically.I know that I will probably need to do this in pure C and than use it in my app, but even in the C language I could not find any answers. Please help.Thanks!

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• How to perform kCATransitionPush animation without any transparency / fade effects

  - by Anthony

  I'm trying to duplicate the "slide up from the bottom" animation that [UIViewController presentModalViewController:animated:] performs but without calling it because I don't want a modal view. The below core animation code comes very close but appears to be changing transparency values of the views during it. At the start of the animation you can partially see through the view sliding up. By the middle/end of the animation the view we are sliding over is fully transparent so we can see behind it. I'd like both to remain fully opaque during this animation. Any ideas on how to stop transparency changes in this code or to otherwise get the "slide up animation" I am looking for without requiring a modal view? UIViewController *nextViewController = [[UIViewController alloc] autorelease]; nextViewController.view.backgroundColor = [UIColor redColor]; CATransition *animation = [CATransition animation]; animation.duration = 3.5; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; animation.type = kCATransitionPush; animation.subtype = kCATransitionFromTop; [self.navigationController pushViewController:nextViewController animated:NO]; [self.navigationController.view.layer addAnimation:animation forKey:nil];

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• NSTableView binding problem

  - by Niklas Ottosson

  I have only just started with XCode (v3.2.2) and Interface Builder and have run into a problem. Here is what I have done: I have made a class to be the datasource of a NSTableView: @interface TimeObjectsDS : NSControl { IBOutlet NSTableView * idTableView; NSMutableArray * timeObjects; } @property (assign) NSMutableArray * timeObjects; @property (assign) NSTableView * idTableView; - (id) init; - (void) dealloc; - (void) addTimeObject: (TimeObj *)timeObject; - (int) count; // NSTableViewDataSource Protocol functions - (int)numberOfRowsInTableView:(NSTableView *)tableView; - (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row: (int)row; I have then bound my NSTableView in the View to this datasource like so: I have also bound the View NSTableView to the Model idTableView variable in Interface Builder seen above In the init function I add a element to the mutable array. This is displayed correctly in the NSTableView when I run the application. However when I add another element to the array (of same type as in init) and try to call [idTableView reloadData] on the View nothing happens. In fact the Model idTableView is null. When printing the variable with NSLog(@"idTableView: %@", idTableView) I get "idTableView: (null)" Im runing out of ideas how to fix this. Any ideas to what I could do to fix the binding?

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• Add UITabBar Control!

  - by Taimur Hamza

  hi, I m stuck in a really simple problem. And i m afraid my question might annoy some people. The problem i am facing in short is that i want to add UITabBar Control to my iphone application other than the main screen. Let me explain, I have done everything successfully Added UItabbar control from IB in the main window's xib, added a variable at the back end , associated it by dragging the line. Also added a UIWindow variable and wrote these lines . [window addSubview:tabBarController.view]; [window makeKeyAndVisible]; when i launch the application a blank window appears and tab bar shows on its bottom. But the problem i dont want to add it to a particular window which is inside my app. Its no the first screen of my app. Its actually the 3rd screen of my app. Can anybody help ? thanks Taimur

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• iPhone metering problems

  - by Eric Christensen

  When I'm recording an AVAudioRecorder object, I repeat a chunk of code via an NSTimer that includes: [soundrecording updateMeters]; NSLog(@"channel 0 average:%f, peak:%f",[soundrecording averagePowerForChannel:0],[soundrecording peakPowerForChannel:0]); NSLog(@"channel 1 average:%f, peak:%f",[soundrecording averagePowerForChannel:1],[soundrecording peakPowerForChannel:1]); When I'm recording a mono file, the peak power for channel 0 is just what you'd expect, a float from -160 to 0. But average power for channel 0 is always zero. (And, of course, the values for channel 1 are both zero.) When I'm recording a stereo file, both the average and peak values for both channels are as expected. Any thoughts on why, when recording a mono file, the average value for channel 0 isn't returning correctly, even though the peak is? Thanks!

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• GKTank example is not working.

  - by david

  Hello, I'm trying to get the GKTank example working with 2 iPhones. Both have bluetooth enabled. I start the app on both devices and tap the screen. The Peer Picker comes up and the devices find each other. If I select one device in the list it says "Waiting for {other iPhone}..." forever. On the {other iPhone} the waiting phone gets grayed out. If I select the device to connect to from both devices at the same time both go into waiting state forever... The debug log says this if I select the other iPhone on the debugged device: 2010-05-30 23:20:24.331 GKTank[2433:4e03] handleEvents started (2) 2010-05-30 23:20:25.269 GKTank[2433:4e03] ~ DNSServiceRegister callback: Ref=135f70, Flags=2, ErrorType=0 name=00oRWv-0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:20:25.375 GKTank[2433:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=8 (name=[en2]), ErrorType=0 name=00oRWv-0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:20:30.691 GKTank[2433:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 name=00K83eS0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:20:30.855 GKTank[2433:4e03] ~ DNSServiceQueryRecord callback: Ref=13a320, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 fullname=00k83es0a..iphone\032von\032tamara._gktank._udp.local. rrtype=16 rrclass=1 rdlen=18 ttl=7200 2010-05-30 23:20:30.872 GKTank[2433:4e03] ** peer 480260628: oldbusy=0, newbusy=0 2010-05-30 23:20:35.215 GKTank[2433:207] ** Stop resolving? potentially previous resolves 2010-05-30 23:20:35.226 GKTank[2433:207] **** BEGIN RESOLVE: 480260628 and it stays that way. On the second iPhone the device is listed as not available and grayed out. If I select each other at the same time it says this: 2010-05-30 23:24:31.416 GKTank[2442:4e03] handleEvents started (2) 2010-05-30 23:24:32.321 GKTank[2442:4e03] ~ DNSServiceRegister callback: Ref=135120, Flags=2, ErrorType=0 name=006JiAZ0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:24:32.419 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=8 (name=[en2]), ErrorType=0 name=006JiAZ0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:24:57.156 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 name=004_n6C0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:24:57.308 GKTank[2442:4e03] ~ DNSServiceQueryRecord callback: Ref=13a320, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 fullname=004_n6c0a..iphone\032von\032tamara._gktank._udp.local. rrtype=16 rrclass=1 rdlen=18 ttl=7200 2010-05-30 23:24:57.314 GKTank[2442:4e03] ** peer 203104196: oldbusy=0, newbusy=0 2010-05-30 23:25:02.383 GKTank[2442:207] ** Stop resolving? potentially previous resolves 2010-05-30 23:25:02.425 GKTank[2442:207] **** BEGIN RESOLVE: 203104196 2010-05-30 23:25:13.562 GKTank[2442:4e03] ~ DNSServiceQueryRecord callback: Ref=13a320, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 fullname=004_n6c0a..iphone\032von\032tamara._gktank._udp.local. rrtype=16 rrclass=1 rdlen=18 ttl=7200 2010-05-30 23:25:13.569 GKTank[2442:4e03] ** peer 203104196: oldbusy=0, newbusy=1 2010-05-30 23:25:33.660 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=0, IFIndex=-3 (name=[]), ErrorType=0 name=004_n6C0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:25:33.671 GKTank[2442:4e03] Peer [203104196] removed? (0). 2010-05-30 23:25:33.683 GKTank[2442:4e03] GKPeer[139f10] 203104196 service count old=1 new=0 2010-05-30 23:25:37.786 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 name=004_n6C0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:25:37.816 GKTank[2442:4e03] GKPeer[139f10] 203104196 service count old=0 new=1 ... and waits forever. Does anybody know whats wrong with this sample??

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• Instruments (Leaks) and NSDateFormatter

  - by Cal

  When I run my iPhone app with Instruments Leaks and parse a bunch of NSDates using NSDateFormatter my memory goes up about 1mb and stays even though these NSDates should be dealloc'd after the parsing (I just discard them if they aren't new). I thought the malloc (in my heaviest stack trace below) could become part of the NSDate but I also thought it could be memory that only used during some intermediate step in parsing. Does anyone know which one it is or how to find out? Also, is there a way to put a breakpoint on NSDate dealloc to see if that memory is really being reclaimed? Here's what my date formatter looks like for parsing these dates: df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"EEE, d MMM yyyy H:m:s z"]; Here's the Heaviest Stack trace when the memory bumps up and stays there: 0 libSystem.B.dylib 208.80 Kb malloc 1 libicucore.A.dylib 868.19 Kb icu::ZoneMeta::getSingleCountry(icu::UnicodeString const&, icu::UnicodeString&) 2 libicucore.A.dylib 868.66 Kb icu::ZoneMeta::getSingleCountry(icu::UnicodeString const&, icu::UnicodeString&) 3 libicucore.A.dylib 868.67 Kb icu::ZoneMeta::getSingleCountry(icu::UnicodeString const&, icu::UnicodeString&) 4 libicucore.A.dylib 868.67 Kb icu::DateFormatSymbols::initZoneStringFormat() 5 libicucore.A.dylib 868.67 Kb icu::DateFormatSymbols::getZoneStringFormat() const 6 libicucore.A.dylib 868.67 Kb icu::SimpleDateFormat::subParse(icu::UnicodeString const&, int&, unsigned short, int, signed char, signed char, signed char*, icu::Calendar&) const 7 libicucore.A.dylib 868.67 Kb icu::SimpleDateFormat::parse(icu::UnicodeString const&, icu::Calendar&, icu::ParsePosition&) const 8 libicucore.A.dylib 868.67 Kb icu::DateFormat::parse(icu::UnicodeString const&, icu::ParsePosition&) const 9 libicucore.A.dylib 868.67 Kb udat_parse 10 CoreFoundation 868.67 Kb CFDateFormatterGetAbsoluteTimeFromString 11 CoreFoundation 868.67 Kb CFDateFormatterCreateDateFromString 12 Foundation 868.67 Kb -[NSDateFormatter getObjectValue:forString:range:error:] 13 Foundation 868.75 Kb -[NSDateFormatter getObjectValue:forString:errorDescription:] 14 Foundation 868.75 Kb -[NSDateFormatter dateFromString:] Thanks!

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• invalid context 0x0 under iOS 7.0 and system degradation

  - by Alex

  I've read as many search results I could find on this dreaded problem, unfortunatelly, each one seems to focus on a specific function call. My problem is that I get the same error from multiple functions, which I am guessing are being called back from functions that I use. To make matters worse, the actual code is within a custom private framework which is being imported in another project, and as such, debugging isn't as simple? Can anyone point me to the right direction? I have a feeling I'm calling certain methods wrongly or with bad context, but the output from xcode is not very helpful at this point. : CGContextSetFillColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextSetStrokeColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. CGContextSaveGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextSetFlatness: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextAddPath: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextDrawPath: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextRestoreGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextGetBlendMode: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. Those errors may occur when a custom view is presented, or one of its inherited classes. At which point they spawn multiple times, until the keyboard won't provide any input. Touch events are still registered, but system slows down, and eventually may lead to unallocated object errors.

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• iPhone Prefix.pch best practices

  - by hgpc

  I have seen many developers that add various convenience macros to the Prefix.pch of their iPhone project. What do (or don't) you recommend adding to the iPhone Prefix.pch file? What does your Prefix.pch look like?

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• NSURLConnection not "firing" until UITableView scrolls..

  - by Simon

  Hi, I've got a UITableView that loads an image asynchronously and places it in the UITableViewCell once it's loaded (I'm using almost the exact same code as in the "LazyTableImages" tutorial). This works fine for all images when I scroll the table, but it's not loading the images that are first in the view. The code is definitely working fine as the class that actually sends the NSURLConnection request is being called correctly (I added an NSLog and it reached the console). The NSURLConnection is just not calling the delegate methods (didReceiveData, connectionDidFinishLoading, etc). Here's my code: HomeController.m - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; NSArray *feed = [feeds objectAtIndex: indexPath.row]; /** * Name of person */ [...] /** * Feed entry */ [...] /** * Misc work */ [...] } FeedRecord *feedRecord = [self.entries objectAtIndex:indexPath.row]; if( !feedRecord.image ) { if (self.table.dragging == NO && self.table.decelerating == NO) { [self startIconDownload:feedRecord forIndexPath:indexPath]; } cell.imageView.image = [UIImage imageNamed:@"Placeholder.png"]; } return cell; } - (void)startIconDownload:(FeedRecord *)feedRecord forIndexPath:(NSIndexPath *)indexPath { IconDownloader *iconDownloader = [imageDownloadsInProgress objectForKey:indexPath]; if (iconDownloader == nil) { iconDownloader = [[IconDownloader alloc] init]; iconDownloader.feedRecord = feedRecord; iconDownloader.indexPathInTableView = indexPath; iconDownloader.delegate = self; [imageDownloadsInProgress setObject:iconDownloader forKey:indexPath]; [iconDownloader startDownload]; [iconDownloader release]; } } IconDownload.m #import "IconDownloader.h" #import "FeedRecord.h" #define kAppIconHeight 48 @implementation IconDownloader @synthesize feedRecord; @synthesize indexPathInTableView; @synthesize delegate; @synthesize activeDownload; @synthesize imageConnection; #pragma mark - (void)dealloc { [feedRecord release]; [indexPathInTableView release]; [activeDownload release]; [imageConnection cancel]; [imageConnection release]; [super dealloc]; } - (void)startDownload { NSLog(@"%@ %@",@"Started downloading", feedRecord.profilePicture); // this shows in log self.activeDownload = [NSMutableData data]; // alloc+init and start an NSURLConnection; release on completion/failure NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest: [NSURLRequest requestWithURL: [NSURL URLWithString:feedRecord.profilePicture]] delegate:self]; self.imageConnection = conn; NSLog(@"%@",conn); // this shows in log [conn release]; } - (void)cancelDownload { [self.imageConnection cancel]; self.imageConnection = nil; self.activeDownload = nil; } #pragma mark - #pragma mark Download support (NSURLConnectionDelegate) - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { NSLog(@"%@ %@",@"Got data for", feedRecord.profilePicture); [self.activeDownload appendData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"%@",@"Fail!"); // Clear the activeDownload property to allow later attempts self.activeDownload = nil; // Release the connection now that it's finished self.imageConnection = nil; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { NSLog(@"%@ %@",@"Done", feedRecord.profilePicture); // Set appIcon and clear temporary data/image UIImage *image = [[UIImage alloc] initWithData:self.activeDownload]; self.feedRecord.image = image; self.activeDownload = nil; [image release]; // Release the connection now that it's finished self.imageConnection = nil; NSLog(@"%@ %@",@"Our delegate is",delegate); // call our delegate and tell it that our icon is ready for display [delegate feedImageDidLoad:self.indexPathInTableView]; } @end Has anyone else experienced anything like this or can identify an issue with my code? Thanks!

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