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  • Chaining animations and memory management

    - by bryan1967
    Hey Everyone, Got a question. I have a subclassed UIView that is acting as my background where I am scrolling the ground. The code is working really nice and according to the Instrumentation, I am not leaking nor is my created and still living Object allocation growing. I have discovered else where in my application that adding an animation to a UIImageView that is owned by my subclassed UIView seems to bump up my retain count and removing all animations when I am done drops it back down. My question is this, when you add an animation to a layer with a key, I am assuming that if there is already a used animation in that entry position in the backing dictionary that it is released and goes into the autorelease pool? For example: - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { NSString *keyValue = [theAnimation valueForKey:@"name"]; if ( [keyValue isEqual:@"step1"] && flag ) { groundImageView2.layer.position = endPos; CABasicAnimation *position = [CABasicAnimation animationWithKeyPath:@"position"]; position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; position.toValue = [NSValue valueWithCGPoint:midEndPos]; position.duration = (kGroundSpeed/3.8); position.fillMode = kCAFillModeForwards; [position setDelegate:self]; [position setRemovedOnCompletion:NO]; [position setValue:@"step2-1" forKey:@"name"]; [groundImageView2.layer addAnimation:position forKey:@"positionAnimation"]; groundImageView1.layer.position = startPos; position = [CABasicAnimation animationWithKeyPath:@"position"]; position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; position.toValue = [NSValue valueWithCGPoint:midStartPos]; position.duration = (kGroundSpeed/3.8); position.fillMode = kCAFillModeForwards; [position setDelegate:self]; [position setRemovedOnCompletion:NO]; [position setValue:@"step2-2" forKey:@"name"]; [groundImageView1.layer addAnimation:position forKey:@"positionAnimation"]; } else if ( [keyValue isEqual:@"step2-2"] && flag ) { groundImageView1.layer.position = midStartPos; CABasicAnimation *position = [CABasicAnimation animationWithKeyPath:@"position"]; position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; position.toValue = [NSValue valueWithCGPoint:endPos]; position.duration = 12; position.fillMode = kCAFillModeForwards; [position setDelegate:self]; [position setRemovedOnCompletion:NO]; [position setValue:@"step1" forKey:@"name"]; [groundImageView1.layer addAnimation:position forKey:@"positionAnimation"]; } } This chains animations infinitely, and as I said one it is running the created and living object allocation doesn't change. I am assuming everytime I add an animation the one that exists in that key position is released. Just wondering I am correct. Also, I am relatively new to Core Animation. I tried to play around with re-using the animations but got a little impatient. Is it possible to reuse animations? Thanks! Bryan

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  • Dismissing pickers and keyboards invoked by a UIWebView

    - by Dev Kanchen
    I am implementing an in-app browser using UIWebView, that shows an 'action' button up-top that - when tapped - scales the UIWebView and allows the user to perform some other actions. If, however, at the point of tapping this 'action' button, the user were entering some text on the webview, or using a picker to select an option from a drop-down list, then the webview gets scaled without dismissing the keyboard/picker. Apart from being ugly, this also obscures my main view and controls. So is there a way to make a UIWebView dismiss all associated input controls, such as keyboards/pickers, when asked to? I tried using [myWebView resignFirstResponder] but that didn't work. Any ideas? Thanks.

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  • setText deprecated

    - by Geo
    Hi there, i saw your comment about getting rid of the setText deprecated error, and using cell.textLabel.text it works perfectly for OS 4.0 but it doesn't work on 3.1.3, the app crashes at the loading screen, have you got any ideas?

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  • While submitting app to iOS App Store, "Unable to unzip application"

    - by Ivan Vucica
    I've successfully submitted "Product Name" to App Store. However, submitting "Product Name Lite", I keep getting the error "Unable to unzip application" in both Application Loader and built-in Xcode's uploader. Error persists even after eliminating spaces from the product name; in fact, I don't think there's whitespace anywhere in the app or the plist anymore. What might be causing this "highly descriptive" error? I'm using Xcode 3.2.5. Attempting to clean, build, and build&archive did not help.

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  • Using CGRectIntersectsRect for collision detection

    - by user309030
    Hi guys, I've got a long rectangular image which is rotated at different kind of angles. However the frame of the rectangular image does not rotate along with the image and instead, the rotation causes the frame to to become larger to fit the rotated image. So when I used CGRectIntersectsRect, the collision detection is totally off because the other image colliding with the rectangular image will collide before it even reaches the visible area of the rect image. In case you don't really know what I'm talking about, have a look at the ascii drawing: normal rectangular image frame, O - pixels, |, – - frame |----------| |OOOOOOOOOO| |----------| after rotation |----------| |O | | O | | O | | O | | O | | O | | O | | O | | O | |----------| I've read through some of the collision articles but all of them are talking about collision with a normal straight rectangle and what I really want is collision with a slanted image, preferably pixel collision detection. TIA for any suggestions made.

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  • UIAccelerationValue angle

    - by dragon
    Hi, - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration Using the above method we got an acceleration value of (x and y and z).Now i want to find angle between (x and y) and (y and z) and (z and x).How can i do this? Can anyone help me ? Thanks in advance.....

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  • Core Data Relationships in pre-populated SQLite database

    - by Cardinal
    Hi All, I'm new to Core Data. Currently I have following tables on hand: tbl_teahcer tbl_student tbl_course tbl_student_course_map ----------- ----------- ---------- ---------------------- teacher_id student_id course_id student_id name name name course_id teahcer_id And I'm going to make the xcdatamodel as below: Course Teacher ------ ------- name name teacher <<----------> courses students <<---| | Student | ------- | name |----->> courses My questions are as follows: As I'd like to create TableView for Cource Entity, is it a must to create the Inverse Relationship from Teacher to Course, and Student to Course? What is the beneit for having the Inverse Relationship? I got some pre-defined data on hand, and I'd like to create a SQLite storage for pre-populated source. How can I set up the relationships (both directions) in SQLite? Thank you for your help! Regards, Cardinal

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  • I want to convert NSString to NSDate but UIPickerView shows current date

    - by Ali
    I want to convert NSString to NSDate but UIPickerView shows current datedatePicker=[[UIDatePicker alloc]init]; datePicker.userInteractionEnabled=YES; datePicker.minuteInterval=5; NSLog(@"Date"); //////// NSString *curDate=alarmData.date; //Jan 14, 2011 11:37 NSDateFormatter *format = [[NSDateFormatter alloc] init]; [format setDateFormat:@"MMM dd, yyyy HH:mm"]; //Optionally for time zone converstions [format setTimeZone:[NSTimeZone timeZoneWithName:nil]]; NSDate *da = [format dateFromString:curDate]; [datePicker setDate:da animated:YES]; any suggestions

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  • dynamic row height

    - by Prasanna Venkatesh
    static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@""]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } //cell.backgroundView = [[[CustomCell alloc] init] autorelease]; cell.selectedBackgroundView = [[[CustomCell alloc] init] autorelease]; // At end of function, right before return cell: cell.textLabel.backgroundColor = [UIColor clearColor]; // Configure the cell. UILabel *myLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(-30, 3, 300, 22)]; UILabel *myLabel2 = [[UILabel alloc] initWithFrame:CGRectMake(10, 22, 310, 200)]; UILabel *myLabel3 = [[UILabel alloc] initWithFrame:CGRectMake(0, 170, 300, 20)]; Book *aBook = [appDelegate.books objectAtIndex:indexPath.row]; myLabel1.text=aBook.title; myLabel2.text=aBook.description; myLabel3.text=aBook.pubDate; NSString *desc = aBook.description; if ([desc isEqualToString:nil]) { NSLog(@"nullll lll "); } //myLabel2.textAlignment=UITextAlignmentCenter; myLabel2.numberOfLines=5; myLabel2.textColor=[UIColor blueColor]; myLabel2.lineBreakMode=UILineBreakModeWordWrap; myLabel2.font=[UIFont systemFontOfSize:14]; myLabel3.numberOfLines=1; myLabel1.numberOfLines=1; myLabel1.textColor=[UIColor redColor]; myLabel1.font=[UIFont systemFontOfSize:20]; myLabel1.shadowColor=[UIColor redColor]; myLabel1.backgroundColor=[UIColor grayColor]; [cell.contentView addSubview:myLabel1]; [cell.contentView addSubview:myLabel2]; [cell.contentView addSubview:myLabel3]; hi guys! i have this following code, i want to display this from xml file. now its working but static row height. if the xml file dont have data then it leaves it as blank. so i want to change row height according to the data i provide using the mylabel1,2,3.text

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  • http-post request for a long String in iOS

    - by onkar
    I am looking to send a very long String, which is an image that is encoded into a String. I need to send that information using POST method. I have implemented the same in Android using key-value pair, I need to implement the same in iOS using key-value pair. Please help me with useful resources/approach. EDIT 1 What have I tried [dictionnary setObject:@"admin" forKey:@"username"]; [dictionnary setObject:@"123123" forKey:@"password"]; NSError *error = nil; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionnary options:kNilOptions error:&error]; NSString *urlString = @"MY CALL URL"; NSURL *url = [NSURL URLWithString:urlString]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; [request setHTTPBody:jsonData]; NSURLResponse *response = NULL; NSError *requestError = NULL; NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&requestError]; NSLog(@"response is obtained"); NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding] ; NSLog(@"%@", responseString); EDIT 2 Error I am getting Request Error Error Domain=kCFErrorDomainCFNetwork Code=303 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 303.)" UserInfo=0x7ba0120 {NSErrorFailingURLKey=http://yahoo.com/, NSErrorFailingURLStringKey=http://yahoo.com/}

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  • Getting Data For Webpages?

    - by fuzzygoat
    When looking to get data from a web page whats the recommended method if the page does not provide a structured data feed? Am I right in thinking that its just a case of doing an NSURLRequest and then hacking what you need out of the responseData(NSData*)? I am not too concerned about the implementation in Xcode, I am more curious about actually collecting the data, before I start coding a "hunt & peck" through a list of data. gary

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  • Can not add a animation to a UIImageView:

    - by Flocked
    Hello, Im trying to add a animation to a UIImageView, but it always fails. Why? Here is the code: UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); animationImage = [[UIImageView alloc]initWithImage:newImage]; [self.view addSubview:animationImage]; CATransition *animation = [CATransition animation]; [animation setDelegate:self]; [animation setDuration:0.35]; [animation setTimingFunction:UIViewAnimationCurveEaseInOut]; animation.type = @"pageCurl"; animation.fillMode = kCAFillModeForwards; animation.endProgress = 0.58; [animation setRemovedOnCompletion:NO]; [[animationImage layer] addAnimation:animation forKey:@"pageCurlAnimation"];

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  • How can I detect device orientation going back and forth through tabs and views?

    - by JoshD
    My application goes back and forth between Portrait and Landscape. I have all of my content(labels, uiimageviews, uilabels) lined up to relocate for both orientations. However, the only change when the device is actually rotated. When I cycle between tabs after it has been rotated it just shows up autosized and not the way I have it setup when the user rotates it. How can I detect the orientation of the device and display the view to reflect the orientation when the taps different tabs?

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  • Why is there no autorelease pool when I do performSelectorInBackground: ?

    - by Thanks
    I am calling a method that goes in a background thread: [self performSelectorInBackground:@selector(loadViewControllerWithIndex:) withObject:[NSNumber numberWithInt:viewControllerIndex]]; then, I have this method implementation that gets called by the selector: - (void) loadViewControllerWithIndex:(NSNumber *)indexNumberObj { NSAutoreleasePool *arPool = [[NSAutoreleasePool alloc] init]; NSInteger vcIndex = [indexNumberObj intValue]; Class c; UIViewController *controller = [viewControllers objectAtIndex:vcIndex]; switch (vcIndex) { case 0: c = [MyFirstViewController class]; break; case 1: c = [MySecondViewController class]; break; default: NSLog(@"unknown index for loading view controller: %d", vcIndex); // error break; } if ((NSNull *)controller == [NSNull null]) { controller = [[c alloc] initWithNib]; [viewControllers replaceObjectAtIndex:vcIndex withObject:controller]; [controller release]; } if (controller.view.superview == nil) { UIView *placeholderView = [viewControllerPlaceholderViews objectAtIndex:vcIndex]; [placeholderView addSubview:controller.view]; } [arPool release]; } Althoug I do create an autorelease pool there for that thread, I always get this error: 2009-05-30 12:03:09.910 Demo[1827:3f03] *** _NSAutoreleaseNoPool(): Object 0x523e50 of class NSCFNumber autoreleased with no pool in place - just leaking Stack: (0x95c83f0f 0x95b90442 0x28d3 0x2d42 0x95b96e0d 0x95b969b4 0x93a00155 0x93a00012) If I take away the autorelease pool, I get a whole bunch of messages like these. I also tried to create an autorelease pool around the call of the performSelectorInBackground:, but that doesn't help. I suspect the parameter, but I don't know why the compiler complains about an NSCFNumber. Am I missing something? My Instance variables are all "nonatomic". Can that be a problem? UPDATE: I may also suspect that some variable has been added to an autorelease pool of the main thread (maybe an ivar), and now it trys to release that one inside the wrong autorelease pool? If so, how could I fix that? (damn, this threading stuff is complex ;) )

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  • Reset UITextField's original placeholder text

    - by Michael
    I'm adding some user feedback mechanism into my app. The user types some comments into a text field and when that editing is done it updates a UITextView. Then when the user hits the submit button and moves on in the app the user may have need to send more feedback from the same form for a different item. I can reset the other fields and labels in the app to their default values when I hide the view, but not the textField (?). How can I reestablish the placeholder text next time the user accesses this view? Your suggestions are humbly appreciated.

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  • Root view controllers and modal dialogs

    - by Tony
    In a custom UIViewController, if I have a member UINavigationController that I initialize with self as the root view, like this: navController = [[UINavigationController alloc] initWithRootViewController:self]; then presenting a modal dialog does not hide the tab bar at the bottom of the screen. The result is that if the user switches to a different tab while a modal dialog is displayed, when they pop back to the tab that was displaying a modal dialog then subsequent calls to presentModalViewController do not display a modal dialog at all, even if I call dismissModalViewControllerAnimated as a result of the tab switch. If I initialize the UINavigationController with out setting self as the root controller, navigationController = [[UINavigationController alloc] init]; then the tab bar is hidden as expected. I've changed things in my program so that this isn't really an issue for me anymore, but I'm not sure that I understand why this is happening. Is it considered bad practice to have a navigation controller with self as the root, if the nav controller is going to be displaying modal dialogs?

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  • MPMediaickerController memory leak

    - by Joe
    This is code from Apple's Addmusic example. MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic]; picker.delegate = self; picker.allowsPickingMultipleItems = YES; picker.prompt = NSLocalizedString (@"Add songs to play", "Prompt in media item picker"); // The media item picker uses the default UI style, so it needs a default-style // status bar to match it visually [[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleDefault animated: YES]; [self presentModalViewController: picker animated: YES]; [picker release]; I'm using this code in my app and the Leaks instrument highlights a leak on the line: [self presentModalViewController: picker animated: YES]; I think that this is because this line retains a reference to picker which cannot be subsequently released. Is there any way around this?

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  • UILabel displaying Unicode Characters

    - by Lee Armstrong
    Hello, I have an NSString that then sets a UILabel. This contains unicode such as... E = MC Hammer\U00ac\U2264 and complete ones such as \U2013\U00ee\U2013\U00e6\U2013\U2202\U2013\U220f\U2013\U03c0 \U2013\U00ee\U2013\U220f\U2013\U03c0\U2013\U00aa\U2013\U221e\U2014\U00c5 These are not displaying correctly, is there anything I need to do to parse these at all?

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  • strange behavior when changing UINavigationController backItem title

    - by Rafael
    Hi, I'm changing the back button item title in the viewDidAppear of a controller in the following way: self.navigationController.navigationBar.backItem.title = @"Previous"; It changes the tittle properly, but the I'm having a strange behaviour. When I select the "previous" button, it changes the tittle of the controller that is up in the stack (i.e the parent controller now has the title "Previous". Do you now why this happened ??? Thanks in advanced for your help.

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  • Extract attributes from NSManagedObject array.

    - by Pavel Peroutka
    NSFetchRequest *req = [NSFetchRequest init]; NSEntityDescription *descr = [NSEntityDescription entityForName:@"City" inManagedObjectContext:context]; [req setEntity:descr]; NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"streetName" ascending:YES]; [req setSortDescriptors:[NSArray arrayWithObject:sort]]; [sort release]; //fetch NSError *error; NSArray *result = [context executeFetchRequest:req error:&error]; //extract names NSMutableArray *streets = [[NSMutableArray alloc] init]; for () { ??? = [array objectAtIndex:i]; [streets addObject:name]; } I expected Core Data to be little more intuitive. I am new in it and I could use some help. I fetched all objects(rows) from the entity (table) City. Now I have an array of objects. From the array I need to extract the attribute “streetName” to an array which will feed the picker. I figured I need to do it in the loop but I could not figure out the way to do it. Please help. I have a background with SQL but Core Data is still a big mystery to me. Is there any publication which would take a SQL statement and show comparable Core Data syntax? Thanks.

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