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  • Convert XCode view-based app to navigation-based app?

    - by Wally
    Newbie question: is there an easy way to convert a view-based app to a navigation-based app? I have an existing app sample that was created as a view-based app, and need to be able to create additional viewcontrollers that can be nested. The app is currently using presentModalViewController calls and nibs to display windows. Trying to change these to pushViewController calls results in the views not being displayed. So I'm assuming it's because the pushViewController needs to use a Navigation view. Thanks in advance!

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  • EXC_BAD_ACCESS on startAsynchronous request using ASIFormDataRequest

    - by user280556
    I am getting EXC_BAD_ACCESS on the Line: [asiUsernameRequest startAsynchronous]; in this code. Spent hours trying to figure it out, but no solution. Any idea? NSString *usernameValue = (NSString*)usernameField.text; NSLog(@"username selected: %@", usernameValue); NSURL *url = [NSURL URLWithString:@"http://www.mywebsite.com/api/usernameCheck"]; //ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; asiUsernameRequest = [[[ASIFormDataRequest alloc] initWithURL:url] retain]; [asiUsernameRequest setPostValue:usernameValue forKey:@"username"]; NSArray *objects = [NSArray arrayWithObjects:@"usernameCheck", nil]; NSArray *keys = [NSArray arrayWithObjects:@"action", nil]; asiUsernameRequest.userInfo = [NSDictionary dictionaryWithObjects:objects forKeys:keys]; [asiUsernameRequest setDelegate:self]; [asiUsernameRequest startAsynchronous];

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  • UIScrollView content to track a CAKeyFrameAnimation along a path

    - by CMLloyd
    In my App I have a full-screen UIScrollView where the content is a UIImageView containing a map image which is about 2000px square (i.e. larger than the UIScrollView). Currently, I plot a path across the map and animate a "beacon" image along it using a CAKeyFrameAnimation, which works great. What I would like to be able to do is to make the UIScrollView content move with the animation in such a way as to keep the beacon image in the centre of the screen (giving the user the impression of tracking along the path). Any suggestions on how I might achieve this?

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  • How save selected switch option

    - by Rkm
    System UIviewcontroller has button , Tap on button i need to fire Info Tableviewcontroller. Tableviewcontroller itself UISwitch. My question is I need to save last selected switch option ON/OFF in UISwitch how to set my control. @implementation Info // Customize the appearance of table view cells. - (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]; } if (indexPath.section) { cell.textLabel.text = @"Sounds"; cell.selectionStyle = UITableViewCellSelectionStyleNone; UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero]; cell.accessoryView = switchView; [switchView setOn:NO animated:NO]; [switchView addTarget:self action:@selector(switchChanged_Sounds:) forControlEvents:UIControlEventValueChanged]; [switchView release]; return cell ; } } - (void) switchChanged_Sounds:(id)sender { UISwitch* switchControl = sender; NSLog( @"The switchChanged_Sounds is %@", switchControl.on ? @"ON" : @"OFF" ); }

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  • problem in adding data to an array in Objective-C!!!

    - by anurag
    I am grappling with adding an NSData object to a NSMutable array. The code is executing fine but it is not adding the objects in the array.The code is as follows: NSData * imageData = UIImageJPEGRepresentation(img, 1.0); int i=0; do{ if([[tempArray objectAtIndex:i] isEqual:imageData]) { [tempArray removeObjectAtIndex:i]; } else { [tempArray addObject:imageData]; //NSLog(@"ANURAG %@",[tempArray objectAtIndex:0]); } }while(i<[tempArray count]) ; The NSLog statement shows the object added is null however the value of imageData is not null. I have defined the tempArray as a static memeber of the class in which this code is written. Is it because of the size of the data object as it is the data of an image????

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  • Pre-drawing a UIView

    - by LK
    There is information that is only available after drawRect that I need to access when loading a UIView. Is there any way to do a "pre-draw" or offscreen in order to get this information earlier?

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  • Navigate to prev and next pdf file?

    - by Claes Gustavsson
    I got a pdf viewer in a uiwebview, from Daniel Barry http://github.com/danberry/PDF-Viewer and it works really well, it displays a pdf doc that you can scroll up and down. Now I would like to display just one page at the time and also have a menu underneat the pdf page with a prev and next button. Can anybody help a newbe to figure out how? Thanks!

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  • XCode Developer Documentation crashes after clicking any link on the startup screen

    - by Noah Sussman
    I just installed XCode 3.2.1. When I open the Developer Documentation and click any link on the startup screen, XCode crashes. Has anyone run into this problem? Also hints as to how to debug would be excellent -- I've only been using XCode for a week. I can still get into the documentation if I open some code and then right-click a symbol and choose "Find in Documentation." But its annoying that I can't just open the docs and browse them.

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  • iPad title bars. Navbars or toolbars?

    - by Squeegy
    I see a bunch of apps for iPad with really cool title bars. These seem to be a combination of a navigation bar and a toolbar. They usually have a back button and a title as well as men other buttons. And a navbar only supports a left item, a right item and and title view. And the toolbar does not really support back buttons or titles. So how do I implement these rich navbars with many buttons on my UINavigationController driven application?

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  • Problem trying to move a CCSprite circle in Cocos2d

    - by thyrgle
    Hi, So I am trying to move a CCSprite (which has the picture of a circle and is 32 by 32 pixels) with ccTouchesBegan. I have tried the following: -(void) ccTouchesBegan:(UITouch *)touch withEvent:(UIEvent *)event { CGPoint location = [touch locationInView:touch.view]; if ((location.x <= L1Circle1.position.x + 32 && location.x >= L1Circle2.position.x - 32) && (location.y <= L1Circle1.position.y + 32 || location.y >= L1Circle2.position.y - 32)) { L1Circle1.position = ccp(location.x, location.y); } } But, when I touch the screen in the simulator nothing happens... What am I doing wrong?

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  • Overflow on UILabels

    - by jkeesh
    I have a table view that I am customizing and I am adding a UILabel as a subview of the contentView, and I want the number of lines to be relatively consistent. I set the numberOfLines property to be 3 so it can't go more than that, but there are still some that overflow onto the 4th line. If it overflows, I want to add a a trailing ... How can I figure out if it overflows? I've tried truncating at different character counts of my string, but since I am using lineBreakMode = UILineBreakModeWordWrap the number of characters doesn't really predict the number of lines. Is there a way to find out the number of lines your UILabel is using?

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  • UIView animation along a round path?

    - by david
    I need to make my little guy (in a UIIamgeView) jump forward and it has to look natural. I want to know is there a way to do it with CoreAnimation (beginAnimation/commitAnimation)? I could do it by setting a point in between in the air but the movement looks not natural :P

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  • Crash on replacing map annotations

    - by Alwin
    Solved it, see below code I'm trying to replace annotations on my MapView depending on the distance between user location and annotation. The annotations are getting replaced like they should, but when I touch te mapview my app crashes. This is de code I have so far: NSMutableArray *tempArray = [[NSMutableArray alloc] init]; for (id object in self.mapAnnotations) { if([object isKindOfClass:[ClosedAnnotation class]]) { ClosedAnnotation *ann = (ClosedAnnotation *)object; CLLocation *tempLocation = [[CLLocation alloc] initWithLatitude:ann.coordinate.latitude longitude:ann.coordinate.longitude]; double distance = [self.currentLocation getDistanceFrom: tempLocation] / 1000; [tempLocation release]; if(distance <= 1.0){ [mapView removeAnnotation:object]; OpenAnnotation *openAnnotation = [[OpenAnnotation alloc] initWithLatitude:ann.coordinate.latitude longitude:ann.coordinate.longitude imageSrc:[ann getImageSrcForAnnotation] title:ann.title tekst:[ann getTextForAnnotation] imageSize:[ann getSizeForImage] username:[ann getUserNameForAnnotation] usertext:[ann getUserTextForAnnotation]]; [mapView addAnnotation:openAnnotation]; [tempArray addObject:openAnnotation]; [openAnnotation release]; } else { [tempArray addObject:object]; } } else if([object isKindOfClass:[OpenAnnotation class]]){ OpenAnnotation *ann = (OpenAnnotation *)object; CLLocation *tempLocation = [[[CLLocation alloc] initWithLatitude:ann.coordinate.latitude longitude:ann.coordinate.longitude] autorelease]; double distance = [self.currentLocation getDistanceFrom: tempLocation] / 1000; [tempLocation release]; if(distance > 1.0){ [mapView removeAnnotation:object]; ClosedAnnotation *closedAnnotation = [[ClosedAnnotation alloc] initWithLatitude:ann.coordinate.latitude longitude:ann.coordinate.longitude imageSrc:[ann getImageSrcForAnnotation] title:ann.title tekst:[ann getTextForAnnotation] imageSize:[ann getSizeForImage] username:[ann getUserNameForAnnotation] usertext:[ann getUserTextForAnnotation]]; [mapView addAnnotation:closedAnnotation]; [tempArray addObject:closedAnnotation]; [closedAnnotation release]; } else { [tempArray addObject:object]; } } } [self.mapAnnotations removeAllObjects]; [self.mapAnnotations addObjectsFromArray:tempArray]; [tempArray release]; I solved it by getting rid of the complete "two-class"-structure and handling everything within one annotation class. Works like a charm now.

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  • Best way to figure out why didReceiveMemoryWarning is always getting called on a UIViewController

    - by wgpubs
    I have a UIViewController and I'm noticing that I've done something to where the didReceiveMemoryWarning method is getting called every time I run it on an actual device. I've run the project with Run Run With Performance Tool Object Allocations (and Leaks also). There are no leaks but I have no idea how to read or understand the "Object Allocations" data that is displayed. So ... How do I read this information and what is/are the best ways to figure out (and resolve) why this is happening? Thanks

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  • Should an NSLock instance be "global"?

    - by Alex Reynolds
    Should I make a single NSLock instance in the application delegate, to be used by all classes? Or is it advisable to have each class instantiate its own NSLock instance as needed? Would the locking work in the second case, if I, for example, had access to a managed object context that is spread across two view controllers?

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  • NSManagedObject - NSSet gets removed ??

    - by aryaxt
    I have an nsmanagedObject this NSManagedObject contains an NSSet. the data for NSSet get's lost when i call release on an NSManagedObject with retain count of 2. Wouldn't retaining an NSManagedObject also retain all it's properties?? - (id)initViewWithManagedObject :(NSManagedObject)obj { if (self = [super init]) { self.managedObject = obj; } } - (void)dealloc { [self.managedObject release]; //Here is when the nsset data gets removed [super dealloc]; } Below describes how the property was created @interface MyManagedObject :NSManagedObject @property (nonatomic, retain) NSSet *mySet; @end @implementation MyManagedObject @dynamic mySet; @end

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  • Tags in TextField

    - by mukeshpawar
    My problem is- i have three cell, within that i have each textfield now i want the user is clicking in which textbox. This method textFieldDidEndEditing gives me the value which user is inputting but i dont get any tag of the textfield

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  • AppDelegate viewController memory leak?

    - by fuzzygoat
    I am just curious with regards to the correct way to create a view controller programatically. When I compile this code with the static analyser I get a leak (as you would expect) from the alloc. Should I just leave it as it needs to stay until the app exits anyways, or is there a cleaner way? - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { NSLog(@"UIApplication application:"); RectViewController *myController = [[RectViewController alloc] init]; [window addSubview:[myController view]]; [window makeKeyAndVisible]; return YES; } cheers Gary

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  • Dispelling the UIImage imageNamed: FUD

    - by Roger Nolan
    I see a lot of people saying imageNamed is bad but equal numbers of people saying the performance is good - especially when rendering UITableViews. See this SO question for example or this article on iPhoneDeveloperTips.com UIImage's imageNamed method used to leak so it was best avoided but has been fixed in recent releases. I'd like to understand the caching algorithm better in order to make a reasoned decision about where I can trust the system to cache my images and where I need to go the extra mile and do it myself. My current basic understanding is that it's a simple NSMutableDictionary of UIImages referenced by filename. It gets bigger and when memory runs out it gets a lot smaller. For example, does anyone know for sure that the image cache behind imageNamed does not respond to didReceiveMemoryWarning? It seems unlikely that Apple would not do this. If you have any insight into the caching algorithm, please post it here.

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  • Any way to trigger interface orientation check?

    - by Johnny Tee
    My app is going from a flipside view (only one orientation) to its main view (can have any sort of orientation. When I go from flipside back to main view, the main view's orientation is not checked and changed immediately. I need a way to trigger the built in orientation check that happens in willRotateToInterfaceOrientation so that the orientation is correct when the user goes from flipside view to main view. Any help is appreciated. I saw another question about this but didn't see a definitive answer. Thanks!

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