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• How to create an image from a UIView / UIScrollView

  - by Andre

  Hi, I have an image in an UIScrollView, that can be scrolled and zoomed. When the user presses a button, I want the code to create an image from whatever part of the UIScrollView is inside an area I specify with a CGRect. I've seen code to crop UIImages, but I can't adapt it to do the same for a view, because it uses CGContextDrawImage. Any thoughts? Cheers, Andre

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• Memory leak issue with UIImagePickerController

  - by Mustafa

  I'm getting memory leak with UIImagePickerController class. Here's how I'm using it: UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [self presentModalViewController:picker animated:YES]; [picker release]; To remove the picker i call [picker dismissModalViewControllerAnimated:YES]; in didFinishPickingImage and imagePickerControllerDidCancel. -- Instruments show around 160bytes leaking as a result of this instruction: +[UIImagePickerController _loadPhotoLibraryIfNecessary] Apparently this issue has and is disturbing many people, and solution to avoid this problem is to build a singleton class dedicated for picking images from library or capturing using device's build in camera. Anyone want to add something?

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• How to add a Tab Bar to an existing view controller, without XIB

  - by Andre

  Hi, I'm trying to avoid using Interface Builder as much as possible. At the moment I have the view controller created via code and change views via code as well. I now need one of the steps to send the app into a new view with a tab bar, that will allow me to change views as well. Ideally, what I'd do is tell the current view controller to add a Tab Bar to the bottom, but I'm not sure if that's doable, so I might have to swap the UIViewController with a UITabBarController? Any help will be appreciated. Cheers, Andre

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• UILabel: adjusting margins to match a UITextView

  - by Aran Mulholland

  I have a UILabel and if i adjust the size of the text i can make it look loke a UITextView however the left margin is different, on the UIlabel the text is right up against the left border where the UITextView has a slight margin. How do i adjust the UILabel so that when these controls are placed above one another, they look consistent?

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• TTLauncherItem: change badge immediately (or: how to refresh TTLauncherView)

  - by vikingosegundo

  I have a TTLauncherView with some TTLauncherItems. These show badges, representing messages from the network. I set the badges in viewWillAppear:, so if I switch to another view and then return, the correct badges are shown. But I want to update the badges as soon a message comes in. Calling setNeedsDisplay on TTLauncherView doesn't help? How can I refresh the TTLauncherView? in my MessageReceiver class I do this: TTNavigator* navigator = [TTNavigator navigator]; [(OverviewController *)[navigator viewControllerForURL:@"tt://launcher"] reloadLauncherView] ; My TTViewController-derived OverviewController @implementation OverviewController - (id)init { if (self = [super init]) { self.title = OverviewTitle; } return self; } - (void)dealloc { [items release]; [overView release]; [super dealloc]; } -(void)viewDidLoad { [super viewDidLoad]; overView = [[TTLauncherView alloc] initWithFrame:self.view.bounds]; overView.backgroundColor = [UIColor whiteColor]; overView.delegate = self; overView.columnCount = 4; items = [[NSMutableArray alloc] init]; for(int i = 1; i <= NumberOfBars; ++i){ NSString *barID = [NSString stringWithFormat:NameFormat, IDPrefix, i]; TTLauncherItem *item = [[[TTLauncherItem alloc] initWithTitle:barID image:LogoPath URL:[NSString stringWithFormat:@"tt://item/%d", i] canDelete:NO] autorelease]; [barItems addObject: item]; } overView.pages = [NSArray arrayWithObject:items]; [self.view addSubview:overView]; } -(void)viewWillAppear:(BOOL)animated { for(int i = 0; i <[barItems count]; i++){ TTLauncherItem *item = [items objectAtIndex:i]; NSString *barID = [NSString stringWithFormat:NameFormat, IDPrefix, i+1]; P1LOrderDispatcher *dispatcher = [OrderDispatcher sharedInstance]; P1LBarInbox *barInbox = [dispatcher.barInboxMap objectForKey:barID]; item.badgeNumber = [[barInbox ordersWithState:OrderState_New]count]; } [super viewWillAppear:animated]; } - (void)launcherView:(TTLauncherView*)launcher didSelectItem:(TTLauncherItem*)item { TTDPRINT(@"%@", item); TTNavigator *navigator = [TTNavigator navigator]; [navigator openURLAction:[TTURLAction actionWithURLPath:item.URL]]; } -(void)reloadLauncherView { [overView setNeedsDisplay];//This doesn't work } @end

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• NSDictionary with key => String and Value => c-Style array

  - by Gautam Borad

  I need an NSDictionary which has key in the form of string (@"key1", @"key2") and value in the form of a C-style two-dimentional array (valueArray1,valueArray2) where valueArray1 is defined as : int valueArray1[8][3] = { {25,10,65},{50,30,75},{60,45,80},{75,60,10}, {10,70,80},{90,30,80},{20,15,90},{20,20,15} }; And same for valueArray2. My aim is given an NSString i need to fetch the corresponding two-dimentional array. I guess using an NSArray, instead of c-style array, will work but then i cannot initialize the arrays as done above (i have many such arrays). If, however, that is doable please let me know how. Currently the following is giving a warning "Passing argument 1 of 'dictionaryWithObjectsAndKeys:' from incompatible pointer type" : NSDictionary *myDict = [NSDictionary dictionaryWithObjectsAndKeys:valueArray1,@"key1", valueArray2,@"key2",nil];

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• pulling an UIImage from a UITextView or UILabel gives white image

  - by user293139

  Hello all, I need to grab an UIImage from a UITextView or UILabel. I've got a method that will pull an image successfully from other types of views ( [UIViewController view], MKMapView, UIButtons) but I am just getting a white rect for my UITextView. I've been banging my head against the wall for a while and suspect something really, really basic. many thanks! @interface TaskAccomplishmentViewController : UIViewController { MKMapView *mapView; UILabel *timeLeftText; UITextView *challengeText; UIButton *successButton; -(void) setChallangeImageToImageFromChallenge { // works // [currChallenge setChallengeImage:[UIImageUtils grabImageFromView:mapView]]; // [currChallenge setChallengeImage:[UIImageUtils grabImageFromView:[self view]]]; // [currChallenge setChallengeImage:[UIImageUtils grabImageFromView:successButton]]; //doesn't work // [currChallenge setChallengeImage:[UIImageUtils grabImageFromView:timeLeftText]]; [currChallenge setChallengeImage:[UIImageUtils grabImageFromView:challengeText]]; } and the grabImage from a UIView code +(UIImage *)grabImageFromView: (UIView *) viewToGrab { UIGraphicsBeginImageContext(viewToGrab.bounds.size); [[viewToGrab layer] renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return viewImage; }

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• UIView's frame, bounds, center, origin, when to use what?

  - by Boon

  UIView has the concept of frame, bounds, center, and origin, and they all seem to be interrelated. Most of the time, I deal with frame when setting the position and size of a UIView (or subclass). I understand that the frame is using global coordinate system and the bounds is using coordinate of the local view (therefore it's x and y are 0, but not always), but it's still confusing to me when to use what. Question: Under what context (and what's the right time) the other properties (bounds, center, origin) should be used?

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• How to get fast, smooth scrolling with UIWebView?

  - by sam

  UIWebView exhibits jerky behavior when scrolling fast through lots of content. Mobile Safari, on the other hand, scrolls quickly and smoothly. It displays a simple checkerboard pattern while scrolling and then renders the page when scrolling is done. How can we get Mobile Safari's fast, smooth scrolling behavior with a UIWebView?

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• Force a UIView to redraw immediately, instead of during next run loop

  - by Justin Kent

  I've created a UIImagePicker / camera view, with a toolbar and custom button for taking a snapshot. I can't really change to using the default way because of the custom button, and I'm drawing on top of the view. When you hit the button, I want to take a screenshot using UIGetScreenImage(); however, the toolbar is showing up in the image, even if I hide it first: //hide the toolbar self.toolbar.hidden = YES; // capture the screen pixels CGImageRef screenCap = UIGetScreenImage(); I'm pretty sure this is because even though the toolbar is hidden, it gets redrawn once the function returns and we enter the next run loop - after UIGetScreenImage is called. I tried making the following addition, but it didn't help: //hide the toolbar self.toolbar.hidden = YES; [self.toolbar drawRect:CGRectMake(0, 0, 320, 52)]; // capture the screen pixels CGImageRef screenCap = UIGetScreenImage(); I also tried using setNeedsDisplay, but that doesn't work either because once again the draw happens after the current function returns. Any suggestions? Thanks!

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• UIScrollview setContentOffset immediate animation?

  - by Jess

  Is there anyway to get the setContentOffset animation to happen immediately instead of waiting until the app returns to the main run loop? I tried setting the animation property to NO and nesting inside of an animation block but it still waits until returning to the main run loop. I've also tried using a sub method to perform the animation. My problem is I perform some heavy work after setting the contentOffset so the scroll view waits until this work is complete to animate the setting of the content offset so it appears to lag for a second.

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• How do I upload an NSImage(NSData)to Twitpic with OAMutableURLRequest?

  - by timothy5216

  I'm using OAConsumer in my xAuth twitterEngine and i'm adding Twitpic OAuth Echo to it. But it won't POST the NSData. here is some of my code: //other file NSArray *reps = [[imageToUpload image] representations]; NSData *imageData = [NSBitmapImageRep representationOfImageRepsInArray:reps usingType:NSJPEGFileType properties:nil]; [twitter testUploadImageData:imageData withMessage:@"Hello WORLD!!" toURL:[NSURL URLWithString:uploadURL.stringValue]]; // - (void)testUploadImageData:(NSData *)data withMessage:(NSString *)message toURL:(NSURL *)url; { //url = @"http://api.twitpic.com/2/upload.xml" //message = @"Hello WORLD!!" NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSString *String = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; NSLog(@"dataString: %@",String); OAMutableURLRequest *request = [[OAMutableURLRequest alloc] initWithURL:url consumer:self.consumer token:_accessToken realm:nil signatureProvider:nil]; // Setup POST body [request setHTTPMethod:@"POST"]; //NSString *stringBoundary = [NSString stringWithString:@"0xKhTmLbOuNdArY"]; //NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", stringBoundary]; // NSString *stringBoundarySeparator = [NSString stringWithFormat:@"\r\n--%@\r\n", stringBoundary]; /* NSMutableString *postString = [NSMutableString string]; [postString appendString:@"\r\n"]; [postString appendString:stringBoundarySeparator]; [postString appendString:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"message\"\r\n\r\n%@", message]]; [postString appendString:stringBoundarySeparator]; [postString appendString:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"media\"; filename=\"%@\"\r\n", @"file.jpg"]]; [postString appendString:@"Content-Type: image/jpg\r\n"]; [postString appendString:@"Content-Transfer-Encoding: binary\r\n\r\n"]; // Setting up the POST request's multipart/form-data body NSMutableData *postBody = [NSMutableData data]; [postBody appendData:[postString dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:data]; [request setHTTPBody:postBody]; */ [request setHTTPMethod:@"POST"]; NSString *thing = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; NSLog(@"%@",thing); [request setParameters:[NSArray arrayWithObjects: [OARequestParameter requestParameterWithName:@"oauth_token" value:_accessToken.key], [OARequestParameter requestParameterWithName:@"X-Auth-Service-Provider" value:@"https://api.twitter.com/1/account/verify_credentials.json"], [OARequestParameter requestParameterWithName:@"key" value:@"my-key-here :P"], [OARequestParameter requestParameterWithName:@"message" value:message], //iv'e changed this many times. I was just trying this to see if it works [OARequestParameter requestParameterWithName:@"media" value:thing], nil]]; OAAsynchronousDataFetcher *dataFetcher = [[OAAsynchronousDataFetcher alloc] init]; [dataFetcher initWithRequest:request delegate:self didFinishSelector:@selector(uploadDidUpload:withData:) didFailSelector:@selector(uploadDidFail:withData:)]; [dataFetcher start]; [dataFetcher release]; [request release]; [pool drain]; } I'm authenticated but it still won't POST the data :(

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• Why does navigationItem.titleView align left when presentmodalviewcontroller called?

  - by jm333

  I'm using a UILabel for the titleView of a navigation bar (I'm making simple in-app web browser). It works fine, except that when I present a modal view controller, the titleView shifts from the center of the navbar to the far left (underneath the back button). I've tested in 3.0 and up. Here is relevant code: - (void)viewDidLoad { [super viewDidLoad]; // Title view label CGRect labelFrame = CGRectMake(0.0, 0.0, 120.0, 36.0); UILabel *label = [[[UILabel alloc] initWithFrame:labelFrame] autorelease]; label.font = [UIFont boldSystemFontOfSize:14]; label.numberOfLines = 2; label.backgroundColor = [UIColor clearColor]; label.textAlignment = UITextAlignmentCenter; label.textColor = [UIColor whiteColor]; label.shadowColor = [UIColor blackColor]; label.shadowOffset = CGSizeMake(0.0, -1.0); label.lineBreakMode = UILineBreakModeMiddleTruncation; self.navigationItem.titleView = label; } -(void)displayComposerSheet:(NSString*)mailto { MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; [self presentModalViewController:picker animated:YES]; [picker release]; } Screenshots: http://img689.imageshack.us/img689/7968/titleviewshift.jpg Any idea why this is happening? Thanks.

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• How to detect changes to Address Book after ABPersonViewController presentation

  - by nkhorman

  I have two view controllers that allow changes to the Address Book. The first one lets you add or create an entry based on an ABRedordRef or edit an existing ABRecordRef, by presentation of either ABUnknownPersonViewController or ABPersonViewController. The second one is a standard ABPeoplePickerNavigationController that allows you to view/edit any of the contents of the Address Book. Both views are accessible easily accessible to the use via the main application UITabBarController. How can I determine that changes were made by either view controller, so that I can force data dependency changes to a third separate view controller. I thought that I saw a notification center message that I could subscribe to, but I can't seem to find it again... I don't care if the notification center is the method that should be used, or a delegate protocol or... whatever, I don't care, I just need to know how to detect the change or the need to re-sync with the Address Book. Can someone Please point me in the right direction. Thank you.

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• x264 IDR access unit with a SPS and a PPS

  - by Gcoop

  Hi All, I am trying to encode video in h.264 that when split with Apples HTTP Live Streaming tools media file segmenter will pass the media file validator I am getting two errors on the split MPEG-TS file WARNING: Media segment contains a video track but does not contain any IDR access unit with a SPS and a PPS. WARNING: 7 samples (17.073 %) do not have timestamps in track 257 (avc1). After hours of research I think the "IDR" warning relates to not having keyframes in the right place on the segmented MPEG-TS file so in my ffmpeg command I set -keyint_min 1 to ensure keyframes where at every frame, but this didn't work. Although it would be great to get an answer, if anyone can shed any light on what a "IDR access unit with a SPS and a PPS" is or what the timestamps warning means I would be very grateful, thanks.

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• Setting background views depending on user settings

  - by munchine

  I've got an app where the background needs to be set depending on user preference. The user can change this at any time via settings tab. I've got it working by checking NSUserDefaults in viewWillAppear and setting self.view.backgroundColor. This is really clunky. The right approach (I thought) is to set the background in the root view and for every views that gets on the stack inherit the background. So in viewDidLoad, I've got self.view.backgroundColor = [UIColor clearColor]; I would have thought this should work. But all I get is a clear background. Any guidance is greatly appreciated.

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• TTPhotoViewController: Images not loading until swipe

  - by Raj

  Hi, I am trying to implement TTPhotoViewController in a sample iPad application. I have implemented properly TTPhotoSource and TTPhoto protocols. The TTPhotoViewController does show image, but not until swiped. The right and left button in the tab bar below doesnt seem to work at all, they never change the image displayed. The UIActivityIndicatorView is never put up, nor the right and left buttons are validated when last or first images are reached. I am initializing the subclass of TTPhotoViewController as a rootViewController of a UINavigationController object which I am adding it onto a view. This rules out the possibility of the problem faced here: http://three20.stackexchange.com/questions/78/ttphotoviewcontroller-not-loading-images-immediately What else am I missing? Anybody faced similar problems and found a way around? Thanks, Raj

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• MapView Annotation Callout action when opened

  - by Paul Peelen

  Hi, I have a mapview with serveral annotations. Every annotation has a leftCalloutAccessoryView which is a UIViewController class. The reason for this is that I want every annotation to load some data from the server, and add the result of that data to the annotation subTitle. This all works perfectly, except that I dont want to load all that data when my app is started, but I want to the remote call to be done only when the callout bubble is opened. Does anybody know how I can do this? The viewWillload, viewDidLoad ect. don't work in this case. Any examples as well? Best regards, Paul Peelen

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• Correct way to load image into UIWebView from NSData object

  - by rustyshelf

  I have downloaded a gif image into an NSData object (I've checked the contents of the NSData object and it's definitely populated). Now I want to load that image into my UIWebView. I've tried the following: [webView loadData:imageData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil]; but I get a blank UIWebView. Loading the image from the same URL directly works fine: NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:imageUrl]]; [imageView loadRequest:request]; Do I need to set the textEncodingName to something, or am I doing something else wrong? I want to load the image manually so I can report progress to the user, but it's an animated gif, so when it's done I want to show it in a UIWebView. Edit: Perhaps I need to wrap my image in HTML somehow? Is there a way to do this without having to save it to disk?

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• what is the proper way to set a UIImageView with a UIImage?

  - by RexOnRoids

  I have a UIImageView that starts off with an image (loading.png) specified in IB. When my app starts, a new image is downloaded from the internet to replace the existing one. I do the following to replace the image: if(object.imageView.image != nil){ [object.imageView.image release]; object.imageView.image = nil; } object.imageView.image = [UIImage imageNamed:@"downloadedimage.png"]; Is this the right way to re-set an image? I am getting EXC_BAD_ACCESS when doing so.

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• UIKeyBoard Return Button UIReturnKeyDone

  - by Dave

  textfield.returnKeyTYpe = UIReturnKeyDone So the above makes my Return button on the keyboard to say Done. I have seen Apps with Blue color button on the UIKeyBoard. Is that simple enough to do? How do I change the background color of the Return key?

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• UINavigationController does not set view properties correctly when pushed

  - by Sheehan Alam

  I have a UITabBarControllerDelegate that pushes a new view controller when a certain tab is pressed: - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { MyView* myView = [[[MyView alloc] initWithNibName:@"MyView" bundle:nil]autorelease]; if([self.tabBarController.selectedViewController.title isEqualToString:@"Friends"]){ NSLog(@"Clicked Friends"); myView.reloadFriends = TRUE; [self.navigationController myView animated:YES]; } } However, if I change my code to set the tabbar's selected view controller to myView everything works, but I don't get my navigation bar: if([self.tabBarController.selectedViewController.title isEqualToString:@"Friends"]){ NSLog(@"Clicked Friends"); myView.reloadFriends = TRUE; self.tabBarController.selectedViewController = myView; } How can I set the reloadFriends property in MyView and have the navigation bar at the top?

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• How to add a button to UINavigationBar?

  - by RexOnRoids

  How to add a button to UINavigationBar programmatically?

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• How do I replace a modal view controller?

  - by Theory

  I'm using a modal view controller to allow a user to select an address book entry and email address. The ABPeoplePickerNavigationController object is displayed via presentModalViewController:animated: [self presentModalViewController:picker animated:YES]; What I want to do is keep the modal dialog up, but when the user selects the email address, it should cross-fade to a different controller that displays a message composition window. I've tried various approaches in peoplePickerNavigationController:shouldContinueAfterSelectingPerson:property:identifier: to dismiss the picker and set my custom composition controller as the modal view. I can do it any number of ways, but never does it fade smoothly from the picker to the composition controller -- unless I make the composition controller a modal dialog of the picker, in which case the picker re-appears when I dismiss the composition controller. I don't want that, either. There must be some way to smoothly replace one controller and its view with another controller and its view, all within the context of a modal dialog, and preferably with a cross fade. Suggestions greatly appreciated.

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• What is the proper way to convert a NSTimeInterval to a string, that works internationally?

  - by Alex Gosselin

  I know the quick and dirty way of dividing by 60 to get minute, hours, etc But is there an official way in the API already implemented, and using the appropriate language for minutes, seconds, etc? Thanks for any help.

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