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• application: didFinishLaunchingWithOptions doesn't execute, but RootViewController: viewDidLoad does

  - by BeachRunnerJoe

  I'm playing around with the iPad SplitView template and it was working fine before I started swapping out view objects in my RootViewController. When it was working fine, the application:didFinishLaunchingWithOptions method would be called and would setup my persistant store objects, then the RootViewController:viewDidLoad method would be called to populate my rootView with data from my store. I opened up IB and started swapping out view objects in my RootView and now the application:didFinishLaunchingWithOptions method never gets called, but the RootViewController:viewDidLoad method still does. Obviously, the app crashes because the viewDidLoad method depends on the successful execution of the didFinishLauchingWIthOptions method to setup the persistent store objects. Does anyone have any thoughts on what is causing this or how I can go about investigating what's causing this? I'm obviously new to iPhone OS development, so I apologize if this questions is absurd in any way. Thanks so much in advance for your help!

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• networkActivityIndicatorVisible on iOS 4

  - by user365660

  Hi, I just downloaded xcode 3.2.3 (seperate directory installation) and ios 4 to my iphone. I'm having a problem with networkActivityIndicatorVisible. This works on 3.1.3, both phone and simulator. My code is (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; UIApplication* app2 = [UIApplication sharedApplication]; app2.networkActivityIndicatorVisible = YES; [self loadSources]; // Loads data in table view app2.networkActivityIndicatorVisible = NO; } I get the same effect in the simulator and on the phone both with ios 4.o The networkActivity indicator becomes visible for a fraction of a second and then invisible and this is done after loading the data for the tableView. Has something changed with this? Teo

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• How do I turn off accelerometer input for my flipside view

  - by user308050

  I have an iPhone 3.1.3 app which has only 2 methods of input in its main view. It has an info button to switch to a flipside view, and the only other input it takes in the main view is accelerometer movement. I want to switch off the accelerometer input when in the flipside view but haven't been able to find out how. I have the main view controller set as an accelerometer delegate, but did not do the same for the flipside view controller, though I suspect that it inherited it from the main view controller. I am really new to xcode and objective c, I have been reading these forums and a couple of developer books, but if anyone has any tips on other good places to look, please let me know.

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• setting enablesReturnKeyAutomatically on UISearchBar

  - by Erik Carlson

  Hi There, I'm writing for iphone OS 3.1.3. I want the search button in the keyboard from my UISearchBar to have the search button enabled all the time. If this was any old UITextField (not a search bar) the property would be enablesReturnKeyAutomatically. I have tried setting this using the example given at http://discussions.apple.com/thread.jspa?messageID=8457910 which suggests: UITextField *searchTextField ; searchTextField = [[searchBar subviews]objectAtIndex:0]; searchTextField.enablesReturnKeyAutomatically = NO ; Should work. unfortunately it crashes: 2010-05-20 08:36:18.284 ARemote[5929:207] *** -[UISearchBarBackground setEnablesReturnKeyAutomatically:]: unrecognized selector sent to instance 0x3b31980 2010-05-20 08:36:18.284 ARemote[5929:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UISearchBarBackground setEnablesReturnKeyAutomatically:]: unrecognized selector sent to instance 0x3b31980' I have also tried ((UITextField *)[(NSArray *)[searchBar subviews] objectAtIndex:0]).enablesReturnKeyAutomatically = NO;</code> Which gives similar results. Any ideas? Cheers Erik

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• How to format float to 2 decimals in objective C

  - by iamdadude

  I have a string that I'm converting to a float that I want to check for values in an if statement. The original float value is the iPhone's trueHeading that is returned from the didUpdateHeading method. When I convert the original float to a string using @"%.2f" it works perfectly, but what I'm trying to do is convert the original float number to the same value. IF I just convert the string to [string floatValue] I get the same original float number, and I don't want that. To make it short and simple, how do I take an existing float value and just get the first 2 decimals?

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• AVURLAsset cannot load with remote file

  - by Quentin

  Hi, I have a problem using AVURLAsset. NSString * const kContentURL = @ "http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8"; ... NSURL *contentURL = [NSURL URLWithString:kContentURL]; AVURLAsset *asset = [AVURLAsset URLAssetWithURL:contentURL options:nil]; [asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:^{ ... NSError *error = nil; AVKeyValueStatus status = [asset statusOfValueForKey:tracksKey error:&error]; ... } In the completion block, the status is AVKeyValueStatusFailed and the error message is "Cannot Open". All exemples I have seen, use a local file, so maybe there is a problem using a remote file... Regards, Quentin

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• How can I detect touch events on a UIImageView inside a deep hierarchy of UIViews?

  - by jester

  I am developing a simple game on iPhone and I started with a View based application, and through the UIViewController I am loading a custom UIView that contains some more UIViews and some UIImageViews. I want to detect touch events on some of the UIImageViews, but I wasn't able so far. I've created a second project for testing purposes and figured that UIImageViews handle touch events when the hierarchy is like : UIViewController - UIView - UIImageView, but when it's like : UIViewController - UIView - UIView - UIImageView they are not detected. Notes: - userInteractionEnabled is YES in all cases - all UIViews and UIImageViews I mention above are custom subclasses. Can you think of any reason why, when a custom UIImageView gets deeper in the view hierarchy can't receive touch events?

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• Serialize struct with pointers to NSData

  - by leolobato

  Hey guys, I need to add some kind of archiving functionality to a Objective-C Trie implementation (NDTrie on github), but I have very little experience with C and it's data structures. struct trieNode { NSUInteger key; NSUInteger count, size; id object; __strong struct trieNode ** children; __strong struct trieNode * parent; }; @interface NDTrie (Private) - (struct trieNode*)root; @end What I need is to create an NSData with the tree structure from that root - or serialize/deserialize the whole tree some other way (conforming to NSCoding?), but I have no clue how to work with NSData and a C struct containing pointers. Performance on deserializing the resulting object would be crucial, as this is an iPhone project and I will need to load it in the background every time the app starts. What would be the best way to achieve this? Thanks!

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• OpenGL ES Simple Undo Last Drawing

  - by Erika

  Hi Everyone, I am trying to figure out how to implement a simple "undo" of last drawing action on the iPhone screen. I draw by first preparing the frame buffer: [EAGLContext setCurrentContext:context]; glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer); I then prepare the vertex array and draw this way: glVertexPointer(2, GL_FLOAT, 0, vertexBuffer); glDrawArrays(GL_POINTS, 0, vertexCount); glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); [context presentRenderbuffer:GL_RENDERBUFFER_OES]; How do I simple undo this last action? There has to be a way to save previous state or an built-in OpenGL ES function, I would think. Thanks

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• TTImageView not working

  - by Ajay Sawant

  Guys, I am new to IPhone and using following code to render the image from remote server using TTImageView from Three20 framework with the help of following code TTImageView* imageView = [[[TTImageView alloc] initWithFrame:CGRectMake(30, 30, 0, 0)] autorelease]; //Working OK //imageView.urlPath = @"http://prosares.co.cc/Images/background.jpg"; //No Working imageView.urlPath = @"http://prosares.co.cc/Images/backgroundTest.jpg"; [self.view addSubview:imageView]; As shown above if I am trying to load background.jpg it's getting loaded correctly but for some reason backgroundTest.jpg is not loading at all. the only diffrance in these images are the size, is there any restriction on the image size that I can load in TTImageView ? Can someone please help me to debug this issue? Thanks Ajay Sawant

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• MKMapView Route/Directions

  - by Mark

  I found that the Google Maps API supports Directions through: var map; var directionsPanel; var directions; function initialize() { map = new GMap2(document.getElementById("map_canvas")); directionsPanel = document.getElementById("my_textual_div"); map.setCenter(new GLatLng(49.496675,-102.65625), 3); directions = new GDirections(map, directionsPanel); directions.load("from: 500 Memorial Drive, Cambridge, MA to: 4 Yawkey Way, Boston, MA 02215 (Fenway Park)"); } So how can this be translated into Objective-C so it can be retrieved by the iPhone? I know how to draw a line on MKMapView I just need the geolocations for the route. Or perhaps there is a different way to get the route between two geolocation points. Please let me know, Thanks in advance.

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• Core Data grouping data in table

  - by OscarTheGrouch

  I am using core data trying to create a simple database app, I have an entity called "Game" which has a "creator". I have basically used the iPhone table view template and replaced the names. I have the games listed by creator. Currently the tableview looks like this... Chris Ryder Chris Ryder Chris Ryder Chris Ryder Dan Grimaldi Dan Grimaldi Dan Grimaldi Scott Ricardo Tim Thermos Tim Thermos I am trying to group the tableview, so that each creator has only one cell in the tableview and is listed once and only once like this... Chris Ryder Dan Grimaldi Scott Ricardo Tim Thermos any help or suggestions would be greatly appreciated.

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• UIScrollView and UIImage in it with paging enabled

  - by Infinity

  Hello guys! I need to display 10 - 1000 images on a UIScrollView. Paging is enabled. So every page of the scrollview is an image, it is an uiimage. I can load 10 images to 10 uiimages which stays in the memory, but with 1000 images I have problems on the iPhone or on the iPad. I am trying to unload and then load the images when I am doing scrolling. I every time displays 3 images. The current page image, and the -1 and +1 pages. When I am scrolling I unload the image and then load the next. With this method I have two problems. The scrolling is laggy and if I scroll very fast the images don't appear. Maybe is there any good solution for these problems? Can you suggest me one?

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• Cocos2d:How to Zoom-in Zoom-out effect on a Sprite image?

  - by user187532

  Hello everyone, I am developing module where-in i pick the image from photo library and put into a Sprite. I want to implement Zoom-in, Zoom-out kind of effect for a Sprite image, same like camera album images zoom in/out effect. Could someone please guide me how do i implement it? I see somewhere is that, i have to detect two touch events in TouchBegan and then Adjust the Sprite Scale size to up or down based on the distance of two fingers touch event values. Could someone please tell me, How do i detect two fingers touch values in TouchBegan? How to allow to touch and Zoom-in/out of Sprite image by user? Please give me samples. I tried already some stuff (http://groups.google.com/group/cocos2d-iphone-discuss/browse_thread/thread/61808fd6b578e5e1?hide_quotes=no&utoken=9AdrAzkAAABFNHPPibbeOSHIuKOkxTWQ066onEraO3W2r08xbUjNmAwT6_SsyC2n0d69MF_vYn77vPb7MuI5eIWgjrXT32Kd) but doesn't work for my requirement. Thank you.

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• What is the "stringWithContentsOfURL" replacement for objective C?

  - by Graeme

  I found a tutorial on the net that uses the stringWithContentsOfURL command that is now deprecated as of iPhone OS 3.0. However I can't find out what I'm meant to use instead, and how to implement it. Below is the code surrounding the stringWithContentsOfURL line in case you need it for reference. NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", [addressField.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]]; NSArray *listItems = [locationString componentsSeparatedByString:@","]; Thanks.

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• Detect backspace in UITextField

  - by marcc

  Is there any way to detect when the backspace/delete key is pressed in the iPhone keyboard on a UITextField that is empty? I want to know when backspace is pressed only if the UITextField is empty. Based on the suggestion from @Alex Reynolds in a comment, I've added the following code while creating my text field: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleTextFieldChanged:) name:UITextFieldTextDidChangeNotification object:searchTextField]; This notification is received (handleTextFieldChanged function is called), but still not when I press the backspace key in an empty field. Any ideas? There seems to be some confusion around this question. I want to receive a notification when the backspace key is pressed. That's it. But the solution must also work when the UITextField is already empty.

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• locate the crash code from the crash log in my ip4 device

  - by lu yuan

  How could I locate the crash code from the crash log in my ip4 device? As the crashed thread 0 presents a serial frameworks and main.m, I couldn't locate the accurate code launched this crash and debug it. Any suggestion? Thanks in advance! Incident Identifier: B6BD84B7-CE0A-485D-A877-0FD0F5B75933 CrashReporter Key: b0b97a37f2a1e4911ce2ef34e1793e028463bb67 Hardware Model: iPhone3,1 Process: myApp [11615] Path: /var/mobile/Applications/28AE71F2-36CA-4A87-83D9-07DF2DFE74F1/myApp.app/myApp Identifier: myApp Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2012-06-09 21:12:22.792 +0800 OS Version: iPhone OS 5.1 (9B176) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000b Crashed Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libobjc.A.dylib 0x36721f78 0x3671e000 + 16248 1 MapKit 0x34e7ace6 0x34e68000 + 77030 2 CoreFoundation 0x3525f1f4 0x35247000 + 98804 3 Foundation 0x311b6740 0x31112000 + 673600 4 CoreFoundation 0x352d4acc 0x35247000 + 580300 5 CoreFoundation 0x352d4298 0x35247000 + 578200 6 CoreFoundation 0x352d303e 0x35247000 + 573502 7 CoreFoundation 0x3525649e 0x35247000 + 62622 8 CoreFoundation 0x35256366 0x35247000 + 62310 9 GraphicsServices 0x36552432 0x3654e000 + 17458 10 UIKit 0x3234ce76 0x3231b000 + 204406 11 myApp 0x0001bac0 main (main.m:16) 12 myApp 0x0001ba80 start + 32

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• How to manage memory using classes in Objective-C?

  - by Flipper

  This is my first time creating an iPhone App and I am having difficulty with the memory management because I have never had to deal with it before. I have a UITableViewController and it all works fine until I try to scroll down in the simulator. It crashes saying that it cannot allocate that much memory. I have narrowed it down to where the crash is occurring: - (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // Dequeue or create a cell UITableViewCellStyle style = UITableViewCellStyleDefault; UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:@"BaseCell"]; if (!cell) cell = [[[UITableViewCell alloc] initWithStyle:style reuseIdentifier:@"BaseCell"] autorelease]; NSString* crayon; // Retrieve the crayon and its color if (aTableView == self.tableView) { crayon = [[[self.sectionArray objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] getName]; } else { crayon = [FILTEREDKEYS objectAtIndex:indexPath.row]; } cell.textLabel.text = crayon; if (![crayon hasPrefix:@"White"]) cell.textLabel.textColor = [self.crayonColors objectForKey:crayon]; else cell.textLabel.textColor = [UIColor blackColor]; return cell; } Here is the getName method: - (NSString*)getName { return name; } name is defined as: @property (nonatomic, retain) NSString *name; Now sectionArray is an NSMutableArray with instances of a class that I created Term in it. Term has a method getName that returns a NSString*. The problem seems to be the part of where crayon is being set and getName is being called. I have tried adding autorelease, release, and other stuff like that but that just causes the entire app to crash before even launching. Also if I do: cell.textLabel.text = @"test"; //crayon; /*if (![crayon hasPrefix:@"White"]) cell.textLabel.textColor = [self.crayonColors objectForKey:crayon]; else cell.textLabel.textColor = [UIColor blackColor];*/ Then I get no error whatsoever and it all scrolls just fine. Thanks in advance for the help! Edit: Here is the full Log of when I try to run the app and the error it gives when it crashes: [Session started at 2010-12-29 04:23:38 -0500.] [Session started at 2010-12-29 04:23:44 -0500.] GNU gdb 6.3.50-20050815 (Apple version gdb-967) (Tue Jul 14 02:11:58 UTC 2009) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-apple-darwin".sharedlibrary apply-load-rules all Attaching to process 1429. gdb-i386-apple-darwin(1430,0x778720) malloc: * mmap(size=1420296192) failed (error code=12) error: can't allocate region ** set a breakpoint in malloc_error_break to debug gdb stack crawl at point of internal error: [ 0 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (align_down+0x0) [0x1222d8] [ 1 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (xstrvprintf+0x0) [0x12336c] [ 2 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (xmalloc+0x28) [0x12358f] [ 3 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (dyld_info_read_raw_data+0x50) [0x1659af] [ 4 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (dyld_info_read+0x1bc) [0x168a58] [ 5 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (macosx_dyld_update+0xbf) [0x168c9c] [ 6 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (macosx_solib_add+0x36b) [0x169fcc] [ 7 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (macosx_child_attach+0x478) [0x17dd11] [ 8 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (attach_command+0x5d) [0x64ec5] [ 9 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (mi_cmd_target_attach+0x4c) [0x15dbd] [ 10 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (captured_mi_execute_command+0x16d) [0x17427] [ 11 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (catch_exception+0x41) [0x7a99a] [ 12 ] /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/libexec/gdb/gdb-i386-apple-darwin (mi_execute_command+0xa9) [0x16f63] /SourceCache/gdb/gdb-967/src/gdb/utils.c:1144: internal-error: virtual memory exhausted: can't allocate 1420296192 bytes. A problem internal to GDB has been detected, further debugging may prove unreliable. The Debugger has exited with status 1.The Debugger has exited with status 1. Here is the backtrace that I get when I set the breakpoint for malloc_error_break: #0 0x0097a68c in objc_msgSend () #1 0x01785bef in -[UILabel setText:] () #2 0x000030e0 in -[TableViewController tableView:cellForRowAtIndexPath:] (self=0x421d760, _cmd=0x29cfad8, aTableView=0x4819600, indexPath=0x42190f0) at /Volumes/Main2/Enayet/TableViewController.m:99 #3 0x016cee0c in -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] () #4 0x016c6a43 in -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] () #5 0x016d954f in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow] () #6 0x016d08ff in -[UITableView layoutSubviews] () #7 0x03e672b0 in -[CALayer layoutSublayers] () #8 0x03e6706f in CALayerLayoutIfNeeded () #9 0x03e668c6 in CA::Context::commit_transaction () #10 0x03e6653a in CA::Transaction::commit () #11 0x03e6e838 in CA::Transaction::observer_callback () #12 0x00b00252 in __CFRunLoopDoObservers () #13 0x00aff65f in CFRunLoopRunSpecific () #14 0x00afec48 in CFRunLoopRunInMode () #15 0x00156615 in GSEventRunModal () #16 0x001566da in GSEventRun () #17 0x01689faf in UIApplicationMain () #18 0x00002398 in main (argc=1, argv=0xbfffefb0) at /Volumes/Main2/Enayet/main.m:14

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• Play video in UIWebView from NSData

  - by Papagalli

  Hello there, Does anybody know how to play a video in a UIVebView ? The video comes from the iphone library, when I pick it, I store it in core data as binary data. If i use the local url of the video it's working fine, the problem I have is that the this url refers to a folder named "tmp", and I don't know the lifetime of it. If I can get the real url of the video file it will be ok. //attachment is the core data object containing the data NSURL *url = [NSURL URLWithString:attachment.path]; [self.webView loadRequest:[NSURLRequest requestWithURL:url]]; I tried a solution that doesn't work: (i tried MIMETypes : "video/quicktime" and "video/mp4") [self.webView loadData:attachment.data MIMEType:@"video/mov" textEncodingName:nil baseURL:nil]; I think the second solution is the closest, and the problem comes from the MIMEType. Thanks by advance if anybody has a solution for this :)

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• Reverse geocode without using MKReverseGeocoder

  - by SpH1nX

  Hi guys, I'm trying to detect current user address using MKReverseGeocoder passing coordinates obtained via CLLocation class. Reading MKReverseGeocoder Class Reference I noticed that The Google terms of service require that the reverse geocoding service be used in conjunction with a Google map; take this into account when designing your application's user interface. so I'm wondering if (and eventually how) can I reverse geocode user current location on iPhone OS SDK 3.1.3. I thought using Google Maps API but the EULA has the same obligation. Yahoo Maps API is even worse and Microsoft one aren't free.

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• Wider than expected margins with CGContextDrawPDFPage

  - by skantner

  I'm rendering PDF pages on iPhone using the code below. It works, but the margins seem much wider than when I view the same PDF using a Acrobat Reader or the Mac's Preview, and that consequently scales the content down much smaller than it otherwise would be. Is my code actually causing this behavior? CGContextSetStrokeColorWithColor(context, backgroundColor.CGColor); CGContextSetFillColorWithColor(context,backgroundColor.CGColor); CGContextSetLineWidth(context, 2.0); CGContextAddRect(context, CGRectMake(0.0,0.0, self.bounds.size.width, self.bounds.size.height)); CGContextDrawPath(context, kCGPathFillStroke); CGContextTranslateCTM(context, 0.0, self.bounds.size.height); CGContextScaleCTM(context, 1.0, -1.0); CGPDFPageRef page = CGPDFDocumentGetPage(myPDF, (size_t) pageNum); CGContextSaveGState(context); CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFMediaBox, self.bounds, 0, true); CGContextConcatCTM(context, pdfTransform); CGContextDrawPDFPage(context, page); CGContextRestoreGState(context);

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• Dealing with the lack of closures in Objective-C

  - by Sean Clark Hess

  Maybe it's just the fact that I've been using http://nodejs.org/ lately, but the lack of closures in Objective-C (iphone) has been really hard to work around. For example, I'm creating service classes. Each service class can have several methods, each of which makes a different URL request. I can use the delegate pattern, but that means that I have to create a new service each time I want to call a method on it (because it has to store the delegate and selector for that request, and new method calls would overwrite them). Even more difficult for me is the fact that I can't easily keep local variables around in the scope for a callback. I have to store anything I want to send back to the delegate on the service class itself, which makes it harder to have more than one method on each class. How do you pros do it? Should I just quit whining and do it another way?

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• Using Objective-C blocks with old compiler

  - by H2CO3

  I'm using the opensource iPhone toolchain on Linux for developing for jailbroken iPhones. I'd like to take advantage of the new (4.0, 5.0) iOS SDK features, but I can't as my old build of GCC doesn't understand the ^ block syntax. I noticed that blocks are just of type id (struct objc_object *). I know this from two resources: first, class-dump reports them as id, second, Apple docs clarify that "blocks can be retained". My quiestion is, how can I take advantage of blocks using this knowledge? I thought of something like: // this is in SDK 4.x/5.x - (void) doSomethingWithBlock:((int)(^block)(int)); // and I modify it like: - (void) doSomethingWithBlock(id)block; the question is: HOW TO ACTUALLY CALL IT? How do I create blocks? I can, of course, create function pointers (IMPs in particular), but how to achieve the object-like memory layout?

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• How to change number of tabs in tabbar controller application ?

  - by hib

  Hi I am developing an iPhone tabbar application with 5 tabs . I want to show only two tabs at the launch time such as one is "locate me". When the user taps on the locate me tab another 3 tabs will be shown and can use the current location. I want to do some thing like "urban spoon" . I am using the interface builder for all the stuff. If any one have any idea , suggestion , links then provide me. Thanks .

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• UIImageWriteToSavedPhotosAlbum not working in iOS 4?

  - by nickthedude

  Ive been using this function: (http://developer.apple.com/iphone/library/documentation/uikit/reference/UIKitFunctionReference/Reference/reference.html#//apple_ref/c/func/UIImageWriteToSavedPhotosAlbum) ...to save a uiimage to the users photo album and it works great on everything except a 4.0 simulator, dont have a device to test on so it may be boned there as well. ive also tried it in both the latest xcode (3.2.3 gm seed) and a previous build of 3.2.3. can anyone confirm that this is still function is still "functional" in iOS 4. the documentation gives no indication that it would be removed and I havent seen anything in searches related to it. Thanks, Nick

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