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  • iOS Core Data migration: moving something from an entity into a file

    - by Tim Sullivan
    I have a scenario where I'm moving the contents of a blob stored in a core data entity into a file. I need a way to export that data during a migration, where I know the entity that's being converted and save the blob to a file, writing the location of that file into the converted entity's appropriate attribute. I can't seem to find a way to do this. The docs regarding the Three Stage Migration seem to indicate what can be done, but I'm not sure where to define things, or what exactly to define.

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  • Dynamically creating subviews of similar type

    - by Akki
    My code for above view is: -(void)viewWillAppear:(BOOL)animated{ float yh = 0; while (yh<200) { //UIView CGRect myFrame = CGRectMake(0, yh, 320, 30); UIView *myFirstView = [[UIView alloc] initWithFrame:myFrame]; myFirstView.backgroundColor = [UIColor orangeColor]; //IUILabel in UIView CGRect mylblFrame = CGRectMake(5, yh, 60, 15); UILabel *lblsize = [[UILabel alloc] initWithFrame:mylblFrame]; lblsize.text = @"Hello"; [myFirstView addSubview:lblsize]; CGRect mylbl_hi = CGRectMake(80, yh, 60, 15); UILabel *lbl_hi = [[UILabel alloc] initWithFrame:mylbl_hi]; lbl_hi.text = @"Hii"; [myFirstView addSubview:lbl_hi]; [self.view addSubview:myFirstView]; [lbl_hi release]; [lblsize release]; [myFirstView release]; yh=yh+40; } [super viewWillAppear:YES]; } I can't understand reason of it being like this...i wanted labels to be attached with my subviews of orange color...this may be odd day for me to understand what's wrong with my code...if any of you can tell me where i ma doing wrong would be great to me. This is my first time creating view programmatically..so please excuse me if all this is silly question

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  • If I create a transient property in the model, isn't this managed by core data then?

    - by mystify
    Just to grok this: If I had a transient property, lets say averagePrice, and I mark that as "transient" in the data modeler: This will not be persistet, and no column will be created in SQLite for that? And: If I make my own NSManagedObject subclass with an averagePrice property, does it make any sense to model that property in the xcdatamodel file? Would it make a difference if I would simply create a property in my subclass and not model that in the entity? (I think: yes, it doesn't matter at all ... but not sure)

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  • Explanation of `self` usage during dealloc?

    - by Greg
    I'm trying to lock down my understanding of proper memory management within Objective-C. I've gotten into the habit of explicitly declaring self.myProperty rather than just myProperty because I was encountering occasional scenarios where a property would not be set to the reference that I intended. Now, I'm reading Apple documentation on releasing IBOutlets, and they say that all outlets should be set to nil during dealloc. So, I put this in place as follows and experienced crashes as a result: - (void)dealloc { [self.dataModel close]; [self.dataModel release], self.dataModel = nil; [super dealloc]; } So, I tried taking out the "self" references, like so: - (void)dealloc { [dataModel close]; [dataModel release], dataModel = nil; [super dealloc]; } This second system seems to work as expected. However, it has me a bit confused. Why would self cause a crash in that case, when I thought self was a fairly benign reference more used as a formality than anything else? Also, if self is not appropriate in this case, then I have to ask: when should you include self references, and when should you not?

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  • Terminating app due to uncaught exception / / SIGABRT // C++ please help!

    - by user282076
    I have just finished one of my apps when I got this message. I cannot for the life of me work out what is wrong. (gdb) continue 2010-02-26 14:05:51.443 BrainTester[2638:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] was unable to load a nib named "SplitSecondViewController"' 2010-02-26 14:05:51.452 BrainTester[2638:207] Stack: ( 861696817, 860329709, 861252493, 861252395, 835170725, 835170141, 835074651, 13515, 834774231, 834773467, 835014237, 835012689, 835011495, 861063661, 861449261, 861447005, 834770767, 834765939, 11025, 10920 ) terminate called after throwing an instance of 'NSException' Program r eceived signal: “SIGABRT”. (gdb) If someone can help, any help is appreciated.

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  • Copy/Paste functionality in UITableViewController.

    - by Simon
    Hi.. I have a UITableViewController. I want to pop the copy/paste menu up when the user touches a cell. How to implement this functionality. Can someone help me. I tried this code, UIMenuController *theMenu = [UIMenuController sharedMenuController]; [theMenu setTargetRect:CGRectMake(10, 200, 100, 40) inView:[self tableView]]; [theMenu setMenuVisible:YES animated:YES]; But it doesn't work. My question is, What CGRect I have to pass as the setTargetRect parameter? Do I need to call SetNeedsDisplayInRect in my TableViewController? What else to do to make this work?

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  • Communicating between classes set up in nib, in code?

    - by cannyboy
    A beginner's question: If, in your nib, you have the File's Owner linked to the ViewController class, and you also have a NSObject-derived class, how do you communicate between the ViewController class and the NSObject class within code? For instance, suppose ScientificCalculatorView.xib looks like this File's Owner (class: ScientificCalculatorViewController) FirstResponder View Calculator (an object that has been linked to the Calculator class) Obviously, I'd want Calculator to be reusable, so it could be used with a NormalCalculatorViewController or something like that. So that UI and the calculator code are separate. Does Calculator even need to be in the nib? It's a beginners question, but I'm just trying to get my head around it.

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  • Zooming to UIView and it's sub-views

    - by leon
    Hi, I have a UIView which I can zoom to (as it is set as a subview of UIScrollView). UIView has UILabel, UITextField, etc. If I just zoom to the UIView, then of course label and text field get fuzzy (the same effect if you are zooming to the image file without changing image resolution). To solve the problem I need to increase the font size and sizes of the UILable and UITextField in according to the scale used to zoom in (scale is passed as a param by the UIScrollView). This is where I am getting confused. Changing frame (by increasing it width and height by zooming scale) I get all my elements (sub-views) repositions (because changing frame effects center and bounds) Question: 1. What would I need to do to zoom in to the sub-views and just increase the sub-view sizes while keeping them in the exactly the same position? thanks

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  • Issue with UIImage files not being found on phone

    - by Driss Zouak
    Note: Using Monotouch. I have a directory called Images where I have all my PNG files. In my code I have the following _imgMinusDark = UIImage.FromFile("images/MinusDark.png"); On the simulator it runs fine, on the phone it's null. I have the Images folder content (all the PNGs) in my MonoDevelop marked as Content in terms of Build Action. What am I missing? thanks

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  • NSURLConnection shown as leaking in instruments

    - by Gyozo Kudor
    Hello another stupid question regarding leaks and also NSURLConnection. How do i release it? Is it enough if i release in the following 2 methods? (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error (void)connectionDidFinishLoading:(NSURLConnection *)connection Because in instruments it shows me the line where I alloc my connection as the source of leaking. OK I don't get it. After the following code my urlConnection has a retain count of 2. WTF? NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest: urlRequest delegate: self]; This is the line that instruments points me to. I find this very weird.

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  • UTC-8 conversion

    - by leachianus
    Hey guys, I am grabbing a JSON array and storing it in a NSArray, however it includes JSON encoded UTF-8 strings, for example pass\u00e9 represents passé. I need a way of converting all of these different types of strings into the actual character. I have an entire NSArray to convert. Or I can convert it when it is being displayed, which ever is easiest. I found this chart http://tntluoma.com/sidebars/codes/ is there a convenience method for this or a library I can download? thanks, BTW, there is no way I can find to change the server so I can only fix it on my end...

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  • Textview with an Imageview as background, inputted text is behind the keyboard

    - by devb0yax
    Hi, I have here a view with an image and the text view (with finite frame size) . I've already implemented the textview keyboard notification but the problem is that when inputting in the textview it still behind the keyboard (the text is not visible). It seems this problem occur when I have an Image view as background. Pls advise me how to fix this. Here's my sample code: http://snipplr.com/view/35758/textview-input-is-behind-the-keyboard/ Thanks

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  • Tab-Bar not hiding on all views

    - by Sheehan Alam
    I have a tab-bar controller that loads a RootView. The RootView has 4 buttons that will load a UITableView I don't want my tab-bar to be visible in the RootView so I added the following code: -(void)viewDidLoad{ self.hidesBottomBarWhenPushed = YES; } When I initially load the app the tab-bar doesn't appear, but when I click on a button, and go back to the RootView the tab-bar still appears. I have tried placing this code in viewWillAppear and other application lifecycle methods but no luck.

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  • What's the best approach for modifying PDF interactive form fields on iOS?

    - by gbreen
    I've been doing some head banging on this one and solicit your advice. I am building an app that as part of it's features is to present PDF forms; meaning display them, allow fields to be changed and save the modified PDF file back out. UIWebViews do not support PDF interactive forms. Using the CGPDF apis (and benefit from other questions posted here and elsewhere), I can certainly present the PDF (without the form fields/widgets), scan and find the fields in the document, figure out where on the screen to draw something and make them interactive. What I can't seem to figure out is how to change the CGPDFDictionary objects and write them back out to a file. One could use the CGPDF Apis to create a new PDF document from whole cloth, but how do you use it to modify an existing file? Should I be looking elsewhere such as 3rd party PDF libs like PoDoFo or libHaru? I'd love to hear from anyone who has successfully modified a PDF and written it back out as to your approach. Thanks!

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  • UIScrollView - with paging enabled, can I "change" the page width?

    - by Mike McMaster
    What's the simplest way to have a scroll view (with pagingEnabled set to YES) have a page width set to something other than the scroll view's bounds? Let me give an example. Suppose I have a scroll view with 10 items, each 150 pixels wide, and my scroll view is 300 pixels wide. If I start with views 1 and 2 visible and scroll horizontally to the right, I want the next "page" to show items 2 and 3. If I scroll one more page to the right, I would see items 3 and 4. Has anyone done this? If not, what strategy would you use?

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  • Drawing single pixel in Quartz

    - by wwrob
    I have an array of CGPoints, and I'd like to fill the whole screen with colours, the colour of each pixel depending on the total distance to each of the points in the array. The natural way to do this is to, for each pixel, compute the total distance, and turn that into a colour. Questions follow: 1) How can I colour a single pixel in Quartz? I've been thinking of making 1 by 1 rectangles. 2) Are there better, more efficient ways to achieve this effect?

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  • Extract part of HTML in C/Objective-C

    - by Dan
    Hi, I need to extract the detail content of a website while preserve all formatting of the division. The section I wish to extract is: ... <div class="detailContent"><p> <P dir=ltr><STRONG>Hinweis</strong>: Auf ... </p> </div> ... My current solution is to use HTMLParser from libxml2 and xpath to find the nodes and walk through all the nodes to reconstruct this piece of HTML. This is a long an complicated code. I' just wondering if there is an easier solution to extract part of HTML? Thanks.

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  • How do I convert a NSString into TIS-620 encoded string

    - by MacPC
    In the apple document, I can see that there's a way to convert from UTF8 string to ASCII string like this NSData *asciiData = [theString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; NSString *asciiString = [[NSString alloc] initWithData:asciiData encoding:NSASCIIStringEncoding]; But my app requires a TIS-620 string to post to a site so I try to do the same thing NSData *asciiData = [newPost.header dataUsingEncoding:kCFStringEncodingMacThai allowLossyConversion:YES]; NSString *asciiString = [[NSString alloc] initWithData:asciiData encoding:kCFStringEncodingMacThai]; NSLog(@"%@", asciiString); The output I got is like this ???????????. Does anyone know how to convert the NSString to TIS-620 properly? Thanks so much.

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  • Parsing json in ios

    - by gaps
    i have the follwing json string ,can anybody tell me how to get the value of role_name {"response":"success","user":{"created_at":"2011-11-16T05:48:31Z","ud_id":"1234567890","last_sign_in_ip":"182.72.141.194","updated_at":"2011-11-19T08:58:27Z","account_id":21,"last_name":"dfg","role_name":"Parent","email":"[email protected]","first_name":"abc"},"status":"200"} code for parsing is NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; NSLog(@"resp--- %@",responseString); NSArray* latestLoans = [(NSDictionary*)[responseString JSONValue] objectForKey:@"user"]; NSDictionary* loan = [latestLoans objectAtIndex:0]; NSString* name = [loan objectForKey:@"last_name"];

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