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• How to add a multiline title bar in UINavigationController

  - by Cocoa Matters

  I have try to add a two line title bar in UINavigationController I want to adjust font size automatically set according to string length.My String max size goes to 60. I have try to implemented through following code UILabel *bigLabel = [[UILabel alloc] init]; bigLabel.text = @"1234567890 1234567890 1234567890 1234567890 1234567890 123456"; bigLabel.backgroundColor = [UIColor clearColor]; bigLabel.textColor = [UIColor whiteColor]; bigLabel.font = [UIFont boldSystemFontOfSize:20]; bigLabel.adjustsFontSizeToFitWidth = YES; bigLabel.clipsToBounds = NO; bigLabel.numberOfLines = 2; bigLabel.textAlignment = ([self.title length] < 10 ? NSTextAlignmentCenter : NSTextAlignmentLeft); [bigLabel sizeToFit]; self.navigationItem.titleView = bigLabel; It didn't work for me can you help me please. I have to made this for iPhone and iPad screen

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• Add the view controller in the TabBarController from within one of its viewControllers ?

  - by user550001

  Hi, I am new to iPhone/iPad Developer. I am developing a application using UITabBarController. I have created a tabbarcontroller class in which i have implemented a UITabBarController object through NIB file. there is 4 tab as LoginPage, Category Page, About Us Page, Setting Page. I want to add logout tab in tabbarcontroller after login in Login Page by programmatically and when user will click to logout tab then it back to home/login screen and logout tab will eliminate. So i need a code snippet to add TabBar Item in UITabBarController within its View Controller. Thank you in advance

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• Steve Jobs Goes On Medical. iPad 2 and iPhone 5 On Track.

  - by Gopinath

  Here is a bit of disappointing news for Apple fan boys. Steve Jobs is again going on medical leave as he wants to concentrate on his health for sometime. In an email to the employees of Apple Steve said, At my request, the board of directors has granted me a medical leave of absence so I can focus on my health..I will continue as CEO and be involved in major strategic decisions for the company.I have great confidence that Tim and the rest of the executive management team will do a terrific job executing the exciting plans we have in place for 2011   Seems to the plans for release of much anticipated iPad 2 and iPhone 5 will not be affected by Steve’s absence -as rumoured iPad 2 In April, iPhone 5 In June With New Hardware. Here is the full content of the email Steve Jobs sent to all employees: Team, At my request, the board of directors has granted me a medical leave of absence so I can focus on my health. I will continue as CEO and be involved in major strategic decisions for the company. I have asked Tim Cook to be responsible for all of Apple’s day to day operations. I have great confidence that Tim and the rest of the executive management team will do a terrific job executing the exciting plans we have in place for 2011. I love Apple so much and hope to be back as soon as I can. In the meantime, my family and I would deeply appreciate respect for our privacy. Steve This article titled,Steve Jobs Goes On Medical. iPad 2 and iPhone 5 On Track., was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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• How to identify iphone , ipad ,ipod touch, iphpne simulator while programming in 3.2 version ?

  - by kmr

  Am unable to identify the device models (iphone , ipad ,ipod touch, iphpne simulator) while programming (in 3.2 version). Alreay am tried with UIDevice Class and some other means, but am unable to get model as ipad when connected to ipad. every time it is giving model other than ipad. So can any one please help me out. Thank you.

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• adding UIImageView to UIScrollView throws exception cocoa touch for iPad

  - by Brodie4598

  I am a noob at OBJ-C :) I am trying to add a UIImageView to a UIScrollView to display a large image in my iPad app. I have followed the tutorial here exactly: http://howtomakeiphoneapps.com/2009/12/how-to-use-uiscrollview-in-your-iphone-app/ The only difference is that in my App the View is in a seperate tab and I am using a different image. here is my code: - (void)viewDidLoad { [super viewDidLoad]; UIImageView *tempImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Cheyenne81"]]; self.imageView = tempImageView; [tempImageView release]; scrollView.contentSize = CGSizeMake(imageView.frame.size.width, imageView.frame.size.height); scrollView.maximumZoomScale = 4.0; scrollView.minimumZoomScale = 0.75; scrollView.clipsToBounds = YES; scrollView.delegate = self; [scrollView addSubview:imageView]; } - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{ return imageView; } and: @interface UseScrollViewViewController : UIViewController<UIScrollViewDelegate>{ IBOutlet UIScrollView *scrollView; UIImageView *imageView; } @property (nonatomic, retain) UIScrollView *scrollView; @property (nonatomic, retain) UIImageView *imageView; @end I then create a UIScrollView in Interface Builder and link it to the scrollView outlet. Thats when I get the problem. When I run the program it crashes instantly. If I run it without linking the scrollView to the outlet, it will run (allbeit with a blnk screen). The following is the error I get in the console: 2010-03-27 20:18:13.467 UseScrollViewViewController[7421:207] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key scrollView.'

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• PDF hyperlinks on iPhone/iPad

  - by RoLYroLLs

  Hi, I've been looking around Google and SO and haven't quite found an answer to my question, or at least a more recent answer. I have a PDF with hyperlinks/hotspots in it and would like to display the PDF file in my own iPhone/iPad app. When the user clicks on a hyperlink/hotspot I would like the user to be taken to the appropriate location of the link (whether another page on the PDF or a webpage outside of the app). I have found many questions like this on here, but most dated over 6 moths ago. While that might not be so long ago, it kind of is in-spite of newer technologies and the probability of someone comping up with new code/way to do it. I looked into the QuartzDemo sample app and edited the PDF to have a hotspot and it does not work. Maybe the ability is there, but not implemented? I have found one app that DOES work great! The GoodReader app displays my PDF and allows the clicking of hotspots in my PDF. However, I'd like this implemented in my own app. So, has anyone been playing around with this? Anyone find a solution? Can anyone point others in a direction? Thanks for your time.

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• xcode UIWebView - Text Fields = No on screen keyboard.

  - by Aakburns

  This application is used to let you use our company basecamp site and only that site. When logged in, if you go to post a new message, you can insert text in the title text field, but if you try to tap in the message body section, it does not bring up the keyboard. I have to assume it's something with my coding, because safari works just fine with it. You can pick textile/html mode or easy. The keyboard does come up in textile/html mode but not in easy formatting mode. Any ideas? Here are some screenshot examples from the iPad. This is shown as the text view not working, no keyboard comes up when you tap in the box. arikburnsDOTcom/forums/fn/IMG_0007.png If you click on 'Switch to Textile/HTML' As seen in the image above, you are presented with this new text box which you can tap in and the keyboard comes up. arikburnsDOTcom/forums/fn/IMG_0006.PNG Now, also note, if you load this same page up in safari, it doesn't actually give you an option as to what text formatting to use, it just works. No options. I basically need to force the 'Textile/HTML' text box somehow and no I cannot change the website code itself. Thanks in advance.

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• http stream of baselineh264 doesnt seem to work in my MPMoviePlayerViewController

  - by theprojectabot

  Here is some code... I have a stream that works correctly if I view with safari on the iphone or quicktimex on the mac... but the stream doesnt view in my code for the ipad simulator - (IBAction)clickedOpenMovie:(id)sender { NSString *myString = [NSString stringWithFormat:@"http://myipofstreamingserver:1935/live/aStream/playlist.m3u8"]; //NSString *myString = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"720p5994-prores-hq_iPhone_320x240.m4v"]; NSURL *myURL = [NSURL fileURLWithPath:myString]; [self playMovieAtURL:myURL]; } -(void)playMovieAtURL:(NSURL*)theURL { //CGRect moviePlayerFrame = CGRectMake(20, 33, 100, 100); //UIView playerView = [[[UIView alloc] initWithFrame:moviePlayerFrame] autorelease]; MPMoviePlayerViewController* movieViewController = [[MPMoviePlayerViewController alloc] initWithContentURL:theURL]; //theMovie.scalingMode = MPMovieScalingModeNone; //theMovie. = MPMovieControlStyleFullscreen; //movieViewController.controlStyle = MPMovieControlModeDefault; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:movieViewController]; //UIViewController *movieViewController = [[UIViewController alloc] initWithContentURL:theURL]; [self presentMoviePlayerViewControllerAnimated:movieViewController]; //[theMovie play]; }

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• shouldAutorotateToInterfaceOrientation won't work!

  - by Dror Sabbag

  Hey. I've been writing my Universal application in portrait mode, and now after about 15 nib files, many many viewCotnrollers, i'd like to implement the shouldAutorotateToInterfaceOrientation and desing some screens in Landscape mode. adding : - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } to ALL of my viewControllers, does not do the work. During Debug, i see that this method is called, but it just won't work! not in the simulator, not in the device, not in Iphone, not in Ipad! i've searched some answers in the forum, and saw some advises to use: - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown ); } Didn't worked either, adding: [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; and [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications]; to my viewDidLoad and viewDidUnload respectively didn't worked either. I'm lost.. Any help will do! just one more info... all my Views are of type UIControl, as i needed the TuchUpInside to work. Appriciate your help.

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• iOS iPad UIActionSheet Issue

  - by hart1994

  I am currently developing an application which needs an option to 'share' using multiple services; such as email, twitter. To to this, I have a UIBarButtonItem coded in and when touched, it triggers this: UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil]; [sheet addButtonWithTitle:@"Email"]; [sheet addButtonWithTitle:@"Tweet"]; [sheet addButtonWithTitle:@"Cancel"]; sheet.cancelButtonIndex = sheet.numberOfButtons-1; [sheet showFromRect:self.view.bounds inView:self.view animated:YES]; [sheet release]; In conjunction with this to detect which button is selected: clickedButtonAtIndex:(NSInteger)buttonIndex { if (buttonIndex == actionSheet.cancelButtonIndex) { return; } switch (buttonIndex) { case 0: { [self emailThis]; break; } case 1: { [self tweetThis]; break; } } This works a treat on the iPhone. But unfortunately it displays incorrectly on the iPad. It looks like it is trying to display the UIPopoverController, but it is positioned center of the navbar with practically no height. I have looked into using the UIPopoverController, but I cannot seem to find out how to use it with buttons. Is there anyway I can adapt the code above to properly display the buttons, as it's trying to already. Many thanks, Ryan PS: I'm new to objective-c/iOS coding, so please be specific. Thank you :)

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• Automatically Sizing UIView after Adding to Window

  - by Kristopher Johnson

  I have an iPad app that switches between different views in its main window. The view-switching code looks like this: - (void)switchToViewController:(UIViewController*)viewController { if (currentViewController != viewController) { [currentViewController.view removeFromSuperview]; currentViewController = viewController; [window addSubview:viewController.view]; } } The problem is that when the new view (a UISplitView) appears in landscape orientation, it is not sized to fill the entire window. There is an empty black space on the right. If I rotate the device and then rotate back, the view sizes itself properly. If the device is in portrait orientation, everything works fine. The UISplitView also gets sized properly if it is the first view I show. The problem only occurs if I switch to it after another view has been shown, in landscape. So, is there some way to force iPhone OS to resize the view after it has been added to the window? I've tried calling sizeToFit, but it didn't work. I've also tried setting the view's bounds to the window's bounds, and I've tried setting the frame.

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• UIImagePickerController shows last picture taken instead of camera input

  - by jules

  I'm having a strange behaviour within my app. For taking pictures i'm using the following pretty standard code for displaying the UIImagePickerController: UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.allowsEditing = NO; picker.sourceType = UIImagePickerControllerSourceTypeCamera; [self presentViewController:picker animated:YES completion:nil]; It works perfectly fine the first time I tap the button which calls this action. The strange behaviour starts when I tap that button again. The UIImagePickerController starts again BUT it doesnt show the input from the camera anymore. It shows the last picture I've taken. More Details of this state: Tapping on the image shows the yellow square of the auto focus. (which it actually uses to focus the camera correctly) When I tap on the ImageCapture button - the correct image is taken and presented on the screen. If I take a picture and press 'Retake' the regular camera image is presented as input. More weirdness: It has nothing to do with the iPad I'm using. Creating a new example app which only has button which calls the code from above everything works perfectly fine. I assume it has something to do with the configuration of the app. Therefore I checked everything but could not find any differences which may cause this issue. Thanks in advance for any advice! Update: I do implement the UIImagePickerControllerDelegate in order to dismiss the UIImagePickerController.

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• i have two mpmovieplayercontrollers and two separate subviews that they utilze... except that only o

  - by theprojectabot

  I would like to have both movies playing at once in their two separate sub views. They are both accessing different media. this is on an ipad with a superview and two little views 320x240 right by eachother on the xib. -(IBAction)playLeft:(id)sender{ if ([self.playerRight playbackState] == MPMoviePlaybackStatePlaying); [self.playerRight stop]; [self.playerLeft play]; } -(IBAction)playRight:(id)sender{ if ([self.playerLeft playbackState] == MPMoviePlaybackStatePlaying); [self.playerLeft stop]; [self.playerRight play]; } - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor]; self.playerLeft = [[MPMoviePlayerController alloc] init]; self.playerLeft.contentURL = [self movieURL]; NSLog(@"self.playerLeft %@", self.playerLeft); self.playerRight = [[MPMoviePlayerController alloc] init]; self.playerRight.contentURL = [self movieURL2]; NSLog(@"self.playerRight %@", self.playerRight); // START_HIGHLIGHT self.playerLeft.view.frame = self.leftView.bounds; self.playerLeft.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; self.playerRight.view.frame = self.rightView.bounds; self.playerRight.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [self.rightView addSubview:playerRight.view]; [self.leftView addSubview:playerLeft.view]; //[self.playerRight play]; //[self.playerLeft play]; //[self clickedOpenMovie:nil]; } -(NSURL *)movieURL { NSBundle *bundle = [NSBundle mainBundle]; NSString *moviePath = [bundle pathForResource:@"720p5994-prores-hq_iPhone_320x240 two" ofType:@"m4v"]; //NSString *moviePath = [NSString stringWithFormat:@"http://localhost:1935/live/aStream/playlist.m3u8"]; if (moviePath) { return [NSURL fileURLWithPath:moviePath]; //return [NSURL URLWithString:moviePath]; } else { return nil; } } -(NSURL *)movieURL2 { NSBundle *bundle = [NSBundle mainBundle]; NSString *moviePath = [bundle pathForResource:@"720p5994-prores-hq_iPhone_320x240" ofType:@"m4v"]; if (moviePath) { return [NSURL fileURLWithPath:moviePath]; } else { return nil; } }

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• Trying to debug a 'Assertion failure in -[UIActionSheet showInView:]' error....

  - by dsobol

  I am working through "Beginning iPad Application Development" and am getting hung up in Chapter 3 where I have created a project that works with an Action Sheet. As it stands now, my application loads into the simulator just fine with no errors that I am aware of, but as it runs, it crashes with the following errors showing up in the debugger window: 2010-05-31 19:44:39.703 UsingViewsActionSheet[49538:207] * Assertion failure in -[UIActionSheet showInView:], /SourceCache/UIKit_Sim/UIKit-1145.66/UIAlert.m:7073 2010-05-31 19:44:39.705 UsingViewsActionSheet[49538:207] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: view != nil' I am sure that this is the block where the app breaks based upon my use of breakpoints. //Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { UIActionSheet *action = [[UIActionSheet alloc] initWithTitle:@"This is my Action Sheet!" delegate:self cancelButtonTitle:@"OK" destructiveButtonTitle:@"Delete Message!" otherButtonTitles:@"Option 1", @"Option 2", @"Option 3", nil]; [action showInView:self.view]; // <-- This line seems to trigger the crash.... [action release]; [super viewDidLoad]; } Am I missing something obvious, or is there more to the problem than is shown here? I have looked at the abstract for showInView and cannot divine anything there yet. I appreciate any and all asssitance. Regards, Steve O'Sullivan

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• iPhone universal app. MoviePlayer.framwork problem.

  - by e40pud

  I have application based on 3.0 iPhone OS SDK One of tasks is playing video (I use MPMoviePlayerController for this task) Now I try to make universal app working on both 3.0 and 3.2 OS I did all steps described in apple documentation: Upgrade Current Target for iPad; make run-time checking for symbols using [[UIDevice currentDevice] respondsToSelector:@selector(userInterfaceIdiom)] function. But when I start my application on device - iPhone with OS 3.1.3 my apllication is crashes with next log: Tue May 25 18:00:28 unknown SpringBoard[24] <Notice>: MultitouchHID(208b30) uilock state: 1 -> 0 Tue May 25 18:00:29 unknown SpringBoard[24] <Notice>: MultitouchHID(292580) device bootloaded Tue May 25 18:00:34 unknown UIKitApplication:...[0xaa0f][1517] <Notice>: dyld: Symbol not found: _MPMoviePlayerWillEnterFullscreenNotification Tue May 25 18:00:34 unknown UIKitApplication:...[0xaa0f][1517] <Notice>: Referenced from: /var/mobile/Applications/876EA35E-5756-436B-A9E2-5481D4D62050/....app/... Tue May 25 18:00:34 unknown UIKitApplication:...[0xaa0f][1517] <Notice>: Expected in: /System/Library/Frameworks/MediaPlayer.framework/MediaPlayer Tue May 25 18:00:35 unknown kernel[0] <Debug>: launchd[1517] Builtin profile: container (seatbelt) Tue May 25 18:00:35 unknown kernel[0] <Debug>: launchd[1517] Container: /private/var/mobile/Applications/876EA35E-5756-436B-A9E2-5481D4D62050 (seatbelt) Tue May 25 18:00:35 unknown ReportCrash[1518] <Notice>: Formulating crash report for process cnetmobile[1517] Tue May 25 18:00:36 unknown com.apple.launchd[1] <Warning>: (UIKitApplication:...[0xaa0f]) Job appears to have crashed: Trace/BPT trap Tue May 25 18:00:36 unknown com.apple.launchd[1] <Warning>: (UIKitApplication:...[0xaa0f]) Throttling respawn: Will start in 2147483646 seconds Tue May 25 18:00:36 unknown SpringBoard[24] <Warning>: Application '...' exited abnormally with signal 5: Trace/BPT trap Tue May 25 18:00:36 unknown ReportCrash[1518] <Error>: Saved crashreport to /var/mobile/Library/Logs/CrashReporter/..._2010-05-25-180034_...-iPhone.plist using uid: 0 gid: 0, synthetic_euid: 501 egid: 0 Tue May 25 18:01:36 unknown SpringBoard[24] <Notice>: MultitouchHID(208b30) uilock state: 0 -> 1 As you can see the error is "Symbol not found: _MPMoviePlayerWillEnterFullscreenNotification". This symbol is notification available in MediaPlayer.framework starting from iPhone OS 3.2 So, what am I doing wrong? What I should do to have universal application working correct on OS 3.2 (with new available functionality) and older OSes (with their functionality)?

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• Autorotation and multiple view controllers

  - by alku83

  I'm creating an iPad application which should only work in portrait and portait upsidedown modes. For performance reasons in my applicationDidFinishLaunching method I'm creating several viewControllers, and adding them to my main window as subviews. I then hide the ones I don't want to see straight away. There is no tab bar or navigation controller. My problem is that only the first viewController seems to be receiving the rotate calls. I have verified this by swapping around the order in which I add the subviews to the main window and NSLog's. Is there some way I can force all the controllers to receive the calls? Some of my views are designed to lay over the top of another view, but this behind view will not always be the same one - so it seems to make sense to have the overlay view in a separate view controller. Am I doing something fundamentally wrong, and that's why it's not behaving as I would expect? EDIT: The accepted answer for this question seems to indicate the exact problem I'm facing: http://stackoverflow.com/questions/548142/uiviewcontroller-rotate-methods

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• Using GDataXMLDocument in iPad app

  - by INs

  I'm trying to use GDataXML library in my ipad application. I followed by instructions: Download the gdata-objective-c client library. Unzip the file, navigate to Source\XMLSupport, and drag the two files GDataXMLNode.h and GDataXMLNode.m into your project In XCode, click Project\Edit Project Settings and make sure “All Configurations” are checked. Find the Search Paths\Header Search Paths setting and add /usr/include/libxml2 to the list. Finally, find the Linking\Other Linker Flags section and add -lxml2 to the list. If in code i add #import "GDataXMLNode.h", all is fine. But when i try to use GDataXMLDocument class in my app GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:xmlData options:0 error:nil]; I received the following message: Ld build/Debug-iphonesimulator/DemoApp.app/DemoApp normal i386 cd /Users/svp/Projects/DemoApp setenv MACOSX_DEPLOYMENT_TARGET 10.6 setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -L/Users/svp/Projects/DemoApp/build/Debug-iphonesimulator -F/Users/svp/Projects/DemoApp/build/Debug-iphonesimulator -filelist /Users/svp/Projects/DemoApp/build/DemoApp.build/Debug-iphonesimulator/DemoApp.build/Objects-normal/i386/DemoApp.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework CoreGraphics -framework MapKit -framework QuartzCore -lxml2.2 -o /Users/svp/Projects/DemoApp/build/Debug-iphonesimulator/DemoApp.app/DemoApp Undefined symbols: "_OBJC_CLASS_$_GDataXMLDocument", referenced from: objc-class-ref-to-GDataXMLDocument in TwitterService.o ld: symbol(s) not found collect2: ld returned 1 exit status Any thoughts?

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• Table cell in a split-view controller - selected cell becomes deselected when called by reloadData

  - by bpapa

  I'm working on a universal app that uses a SplitViewController to present a master-detail view. In the iPad HIG on Split Views, Apple states: In general, indicate the current selection in the left pane in a persistent way. This behavior helps people understand the relationship between the item in the left pane and the contents of the right pane. This is important because the contents of the right pane can change, but they should always remain related to the item selected in the left pane. So I'm trying to maintain selection state on the left. Easy enough when the user taps, I just remove the deselectRowAtIndexPath:animated: message from tableView:didSelectRowAtIndexPath: implementation. But, I also want the selection state to show up by default (without a user tap). I wound up putting this in my tableView:cellForRowAtIndexPath: implementation: if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { if (cellShouldBeSelected) cell.selected = YES; else cell.selected = NO; } The behavior I'm seeing, is that when the cells finall appear, for a fraction of a section the cell is indeed selected, but then the selection disappears without any user interaction. Any ideas? I set the new clearsSelectionOnViewWillAppear property to NO, but that doesn't seem to fix it, and it shouldn't really matter because I'm marking the cell as selected long after viewWillAppear is called - I'm actually doing it after some network activity and then sending the table view a reloadData message.

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• iPhone UIScrollView embedded UIView is clipped

  - by scc

  Hello. I have an iPad UIView subclass (we'll call LargerUIView) with which I do a bunch of drawing via drawRect: once asked. That all appears to be working, and looks the way I like. I'm at the point now of trying to get scrolling working (just in the horizontal to begin), yet when I try to scroll, what shows below is black (ie, appears to have never been drawn). That doesn't surprise me as it's likely been clipped. Looking for suggestions. Here's what I'm doing so far: MyAppDelegate.m - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { CGRect scrollRect = CGRectMake(0, 0, 768, 1024); UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:scrollRect]; LargerUIView *view = (LargerUIView *)[viewController view]; [scrollView addSubview:view]; [scrollView setContentSize:CGSizeMake(768, pageHeight)]; [scrollView setContentMode:UIViewContentModeRedraw]; [scrollView setClipsToBounds:YES]; [window addSubview:scrollView]; [scrollView release]; // Without this next line, the "frontmost" (ie, most recently added subview) // is the MoxiesAppetizerMenu - which is not equipped to handle scrolling/UIEvents [window sendSubviewToBack:view]; // Show it all. [window makeKeyAndVisible]; return YES; } Any suggestions? Have tried changing "setClipsToBounds" to NO as well.

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• Quartz 2D or OpenGL ES? Pros and cons in the long term, possibility of migration to other platforms.

  - by fspirit

  Hi all! I'm having a hard time deciding whether to go with Quartz2D or OpenGL for an iPad game. It will be 2D mostly, but effect-intense (simultaneous lighting effects for 10-30 objects, 10-20 simultaneous animations on the screen). So far, assuming i'm equally dumb in both technologies and have to learn them from the ground, i came to this list. (I've read several topics here, on SO, with names like "Quartz or OpenGL", but i'm still left with some questions) Quartz: Better time-to-market, because of ready to use absractions like UIView, UIImageView, CoreAnimation abstractions Open GL ES Closer to hardware, thus, performance is better. App, implemented with OpenGL ES can be easier migrated to Android, MeeGo, Windows Phone, etc. My questions are: How time will it take to rewrite Quartz 2d app to use OpenGL? Lets say it took me 2 man-month to write Quartz app, how much time will i need to rewrite it? (Please, just some subjective opinions, i'll try to summarize them somehow) Regarding the ease of migration to other platforms, when using OpenGL, is it really so? Or efforts when migrating Quartz app from iPhoneOS to Android will be not so much bigger, compared to OpenGL app migration? (Ease of migration is quite important criterion) Regarding OpenGL, should i go with OpenGL 1.1 or 2.0, concerning migration? (Android supports 2.0 through NDK, but dont know whether NDK's use will increase or decrease migration efforts)

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• Does Apple's Reachability work with 3G connectivity?

  - by rickharrison

  I am developing an iPad application, and I am trying to figure out the best way to decide if a user can connect to the Internet. If the user has no connectivity, I will load cached data, otherwise I will load new data. I am trying to use Apple's reachability class for this, and I wanted to see if I am doing this correctly. In applicationDidFinishLaunchingWithOptions, I am doing this: [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil]; Reachability hostReach = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain]; [hostReach startNotifer]; Then my reachabilityChanged: looks like this: - (void)reachabilityChanged:(NSNotification* )note { Reachability *curReach = [note object]; self.internetConnectionStatus = [curReach currentReachabilityStatus]; if (internetConnectionStatus == NotReachable) { [viewController getDataOffline]; } else { if (![[NSUserDefaults standardUserDefaults] objectForKey:kFIRST_LAUNCH]) [viewController getCurrentLocation]; else [viewController getData]; } } Right now, this is working perfectly for WiFi iPads. I just want to make sure that this will work for 3G iPads. Could you please let me know if I am doing this correctly or not?

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• CATransaction: Layer Changes But Does Not Animate

  - by macinjosh

  I'm trying to animate part of UI in an iPad app when the user taps a button. I have this code in my action method. It works in the sense that the UI changes how I expect but it does not animate the changes. It simply immediately changes. I must be missing something: - (IBAction)someAction:(id)sender { UIViewController *aViewController = <# Get an existing UIViewController #>; UIView *viewToAnimate = aViewController.view; CALayer *layerToAnimate = viewToAnimate.layer; [CATransaction begin]; [CATransaction setAnimationDuration:1.0f]; CATransform3D rotateTransform = CATransform3DMakeRotation(0.3, 0, 0, 1); CATransform3D scaleTransform = CATransform3DMakeScale(0.10, 0.10, 0.10); CATransform3D positionTransform = CATransform3DMakeTranslation(24, 423, 0); CATransform3D combinedTransform = CATransform3DConcat(rotateTransform, scaleTransform); combinedTransform = CATransform3DConcat(combinedTransform, positionTransform); layerToAnimate.transform = combinedTransform; [CATransaction commit]; // rest of method... } I've tried simplifying the animation to just change the opacity (for example) and it still will not animate. The opacity just changes instantly. That leads me to believe something is not setup properly. Any clues would be helpful!

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• Auto-rotating freshly created interface

  - by zoul

  Hello! I have trouble with auto-rotating interfaces in my iPad app. I have a class called Switcher that observes the interface rotation notifications and when it receives one, it switches the view in window, a bit like this: - (void) orientationChanged: (NSNotification*) notice { UIDeviceOrientation newIO = [[UIDevice currentDevice] orientation]; UIViewController *newCtrl = /* something based on newIO */; [currentController.view removeFromSuperview]; // remove the old view [window addSubview newCtrl.view]; [self setCurrentController:newCtrl]; } The problem is that the new view does not auto-rotate. My auto-rotation callback in the controller class looks like this: - (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation) io { NSString *modes[] = {@"unknown", @"portrait", @"portrait down", @"landscape left", @"landscape right"}; NSLog(@"shouldAutorotateToInterfaceOrientation: %i (%@)", io, modes[io]); return YES; } But no matter how I rotate the device, I find the following in the log: shouldAutorotateToInterfaceOrientation: 1 (portrait) shouldAutorotateToInterfaceOrientation: 1 (portrait) …and the willRotateToInterfaceOrientation:duration: does not get called at all. Now what? The orientation changing is becoming my least favourite part of the iPhone SDK… (I can’t check the code on the device yet, could it be a bug in the simulator?) PS. The subscription code looks like this: [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];

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• How do I send text to a UITextView?

  - by Lee

  I'm new to iphone development. I'm a VB programmer who is trying to convert a VB application to an ipad app. I need some help with sending text to a UITextView. I want to first have a UIPickerView and then once the user hits a UIButton, a UITextView appears and the text is then generated by my source code code, line by line. The code would constantly be concatenating strings to the text. It would sort of go like this-- 1) User makes selections with UIPickerView. 2) User then hits UIButton. 3) UIPickerView is replaced on the screen with a UITextView. 4) The code does stuff. 5) The code adds the 1st line of text into the UITextView. 6) The code does more stuff. 7) The code then adds the 2nd line of text into the UITextView, retaining the 1st line that was already there. Steps 6 and 7 are repeated until the code is done. Does anyone know of any examples of this that I could look at? I am mostly interested in finding something like a youtube video, a webpage that explains the code or even a good book that covers this particular topic. I am finding that the sample codes that Apple has on this site goes over my head. In fact, I could probably benefit from a good book. But, I am looking for one that I would already know covers this particular topic, since it is so essential to the app that I am trying to build.

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• Confused about UIView frame property

  - by slowfungus

  I'm building a prototype iPad app that draws diagrams. I have the following view hierarchy: UIView UIScrollView DiagramView : UIView TabBar NavigationBar And a UIViewController subclass holding all that together. Before drawing the diagram the first time I calculate the dimensions of the diagram, and set the DiagramView frame to that size, and the content size of the scrollview as well. -(void)recalculateBounds { [renderer diagram:diagram shouldDraw:NO]; SQXRect diagramRect = SQXMakeRect(0.0,0.0,[diagram bounds].size.width,[diagram bounds].size.height); self.frame = diagramRect; [(UIScrollView*)[self superview] setContentSize:diagramRect.size]; } I should disclose that the frame is being set to about 1500 x 3500 which i know is ridiculous. I just want to focus on some other parts of the app before I get into optimizing the render code. This works beautifully, except that the rect being passed to drawRect is not the size that I set, and my drawing is getting clipped at the bottom. Its close the size i set, but bigger in width, and shorter in height. Also of note, is the fact that if I force the frame to be much bigger than what I know the diagram needs, then the drawRect:rect is big enough, and no clipping occurs. Of course this has me wondering if the frame size needs to take into account some other screen real estate like the toolbars but my reading of the docs tells me the frame is in superview coordinates, which would be the scrollview so I reckon I need to worry about such things. Any idea what is causing this discrepancy?

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