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  • Generating a list of Strings in Obj C

    - by eco_bach
    Hi It seems that Objective C jumps thru hoops to make seemingly simple tasks extremely difficult. I simply need to create a sequence of strings, image1.jpg, image2.jpg, etc etc ie in a loop var imgString:String='image'+i+'.jpg; I assume a best practice is to use a NSMutableString with appendString method? What am I doing wrong?? NSMutableString *imgString; for(int i=1;i<=NUMIMAGES;i++){ imgString.appendString(@"image"+i+@".jpg"); } I get the following error error: request for member 'appendString' in something not a structure or union

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  • Converting NSData to an NSString representation is failing

    - by Ricky D'Amelio
    Hi there. I have an NSData object which I am trying to turn into an NSString using the following line of code: NSString *theData = [[NSString alloc] initWithData:photo encoding:NSASCIIStringEncoding]; Unfortunately I am getting the following result, instead of my desired binary output (can I expect a binary output here?); ÿØÿà I'd appreciate any help. Thanks. Ricky.

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  • Hiding a UINavigationController's UIToolbar during viewWillDisappear:

    - by Nathan de Vries
    I've got an iPhone application with a UITableView menu. When a row in the table is selected, the appropriate view controller is pushed onto the application's UINavigationController stack. My issue is that the MenuViewController does not need a toolbar, but the UIViewControllers which are pushed onto the stack do. Each UIViewController that gets pushed calls setToolbarHidden:animated: in viewDidAppear:. To hide the toolbar, I call setToolbarHidden:animated: in viewWillDisappear:. Showing the toolbar works, such that when the pushed view appears the toolbar slides up and the view resizes correctly. However, when the back button is pressed the toolbar slides down but the view does not resize. This means that there's a black strip along the bottom of the view as the other view transitions in. I've tried adding the toolbar's height to the height of the view prior to hiding the toolbar, but this causes the view to be animated during the transition so that there's still a black bar. I realise I can manage my own UIToolbar, but I'd like to use UINavigationControllers built in UIToolbar for convenience. This forum post mentions the same issue, but no workaround is mentioned.

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  • iPhone GPS Development - Tips + Tricks

    - by Keith Fitzgerald
    Hello - I'm looking for some feedback, blog links, etc that offer some tips and tricks for iPhone GPS development. I've read and understand the API, I have my demo app up and running, etc but I have run into some "quirks" with gps on iphone. For example, it seems that you you will receive a lot less location updates when your iphone enters "power save" mode. I've read that you can combat this by playing music in your application [not sure if this is true]. It also seems that, terms of making a reasonable pedometer, you should filter out any reading with horizontal accuracies less than 20 meters. Does this sound right? Is there any kind of checklist out on the web for iphone gps gotchas? Thanks in advance.

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  • Receiving Error Domain=kCFErrorDomainCFNetwork Code=2 when attempting to read from ReadStream

    - by theactiveactor
    I'm attempting to synchronously read from a CFReadStream objected created by CFStreamCreatePairWithSocketToHost. The stream opened fine but when I attempt to invoke CFReadStreamRead on it in a loop, CFReadStreamRead() returns -1 and the resulting error is: Error Domain=kCFErrorDomainCFNetwork Code=2 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)" UserInfo=0x14a920 {kCFGetAddrInfoFailureKey=8} I'm also receiving this same exact error when using this ReadStream asynchronously- the first callback I receive is this error.

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  • Frame load interrupted error while loading a word document in UIWebView

    - by Mugunth Kumar
    I want to load a word document using UIWebView. I used the code provided in http://developer.apple.com/iphone/library/qa/qa2008/qa1630.html to load the document. But not all the documents load successfully. Sometimes I get an error Error Domain=WebKitErrorDomain Code=102 UserInfo=0x145bc10 "Frame load interrupted" The error seems to be very sporadic and I get this error only for some documents. However the same document loads correctly in mail.app. What am I missing?

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  • Aquatic Prime on 10.6?

    - by Kevin
    Hello, I have 2 applications that I use with Aquatic Prime. One is an application just with the Aquatic Prime framework, and the other is an application that I've been working on that has been incorporated with the Aquatic Prime framework. The first application I mentioned before has its SDK set to 10.5 with the architecture to 32-bit. The second application I made has its SDK that is set to 10.6 (which it has to since I need NSRunningApplication) and its architecture to 32-bit. Now my question is, whenever I debug my first application it works perfectly fine, but with my second it gives me this interrupted error right after Running. What's going wrong? I've tried doing some breakpoints like "objc-exception-throw" but all it says is stopped at breakpoint 1. I need 10.6 in my application, but I also need Aquatic Prime. Can anyone help me solve this problem? Ok here's the one from the stack trace which I have no idea how to read: 0x91cdff11 <+0000> push %ebp 0x91cdff12 <+0001> mov %esp,%ebp 0x91cdff14 <+0003> sub $0x28,%esp 0x91cdff17 <+0006> mov %ebx,-0xc(%ebp) 0x91cdff1a <+0009> mov %esi,-0x8(%ebp) 0x91cdff1d <+0012> mov %edi,-0x4(%ebp) 0x91cdff20 <+0015> call 0x91cdff25 <objc_exception_throw+20> 0x91cdff25 <+0020> pop %ebx 0x91cdff26 <+0021> mov 0x8(%ebp),%esi 0x91cdff29 <+0024> lea 0xe4cbb8b(%ebx),%edi 0x91cdff2f <+0030> mov 0x4(%edi),%eax 0x91cdff32 <+0033> test %eax,%eax 0x91cdff34 <+0035> jne 0x91cdff3b <objc_exception_throw+42> 0x91cdff36 <+0037> call 0x91ce4f53 <set_default_handlers> 0x91cdff3b <+0042> mov %esi,(%esp) 0x91cdff3e <+0045> nop 0x91cdff3f <+0046> nopl 0x0(%eax) 0x91cdff43 <+0050> mov %esi,(%esp) 0x91cdff46 <+0053> call *0x4(%edi) 0x91cdff49 <+0056> lea 0xfd44(%ebx),%eax 0x91cdff4f <+0062> mov %eax,(%esp) 0x91cdff52 <+0065> call 0x91ce4e1f <_objc_fatal> The the GDB tells me its all good: run [Switching to process 990] Running… 2009-10-14 15:20:33.233 ApplicationName[990:a0f] init Sincerely, Kevin

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  • Multiple undo managers for a text view

    - by Rui Pacheco
    Hi, I've a text view that gets its content from an attributed string stored in a model object. I list several of these model objects in a drawer and when the user clicks on one the text view swaps its content. I now need to also swap the undo manager for the text view. I initialise an undo manager on my model object and use undoManagerForTextView to return it to the text view, but something's not quite right. Strategically placed logging statements show me that everything's working as planned: on startup a new model object is initialised correctly and a non-null undo manager is always pulled by the text view. But when it comes to actually doing undo, I just can't get the behaviour I want. I open a window, type something and press cmd+z, and undo works. I open a window, type something, select a new model on the table, type something, go back to the first model and try to undo and all I get is a beep. Something on the documentation made me raise an eyebrow, as it would mean that I can't have undo with several model objects: The default undo and redo behavior applies to text fields and text in cells as long as the field or cell is the first responder (that is, the focus of keyboard actions). Once the insertion point leaves the field or cell, prior operations cannot be undone.

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  • Date since 1600 to NSDate?

    - by Steven Fisher
    I have a date that's stored as a number of days since January 1, 1600 that I need to deal with. This is a legacy date format that I need to read many, many times in my application. Previously, I'd been creating a calendar, empty date components and root date like this: self.gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar ] autorelease]; id rootComponents = [[[NSDateComponents alloc] init] autorelease]; [rootComponents setYear: 1600]; [rootComponents setMonth: 1]; [rootComponents setDay: 1]; self.rootDate = [gregorian dateFromComponents: rootComponents]; self.offset = [[[NSDateComponents alloc] init] autorelease]; Then, to convert the integer later to a date, I use this: [offset setDay: theLegacyDate]; id eventDate = [gregorian dateByAddingComponents: offset toDate: rootDate options: 0]; (I never change any values in offset anywhere else.) The problem is I'm getting a different time for rootDate on iOS vs. Mac OS X. On Mac OS X, I'm getting midnight. On iOS, I'm getting 8:12:28. (So far, it seems to be consistent about this.) When I add my number of days later, the weird time stays. OS | legacyDate | rootDate | eventDate ======== | ========== | ==========================|========================== Mac OS X | 143671 | 1600-01-01 00:00:00 -0800 | 1993-05-11 00:00:00 -0700 iOS | 143671 | 1600-01-01 08:12:28 +0000 | 1993-05-11 07:12:28 +0000 In the previous release of my product, I didn't care about the time; now I do. Why the weird time on iOS, and what should I do about it? (I'm assuming the hour difference is DST.) I've tried setting the hour, minute and second of rootComponents to 0. This has no impact. If I set them to something other than 0, it adds them to 8:12:28. I've been wondering if this has something to do with leap seconds or other cumulative clock changes. Or is this entirely the wrong approach to use on iOS?

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  • How to update a detailView in a splitViewController?

    - by pikebu
    Hello, I'm trying to update a detailView in a splitViewController. This is what I try: //Get the application delegate AppDelegate *delegate = [[UIApplication sharedApplication] delegate]; //Get the masterViewController MasterViewController *master = [delegate.splitViewController.viewControllers objectAtIndex:0]; This seems to work fine so far. Then I try to update a label in the detailViewController by doing this: master.detailViewController.myLabel.text = "someText"; But this doesn't work. (ignore the missing at sign in front of the "someText" - I have it, but it seems it's not allowed to put it in this forum.) So how is the right way to access the outlets of in the detailView? Thanks for help.

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  • How to troubleshoot deallocation of object in uitableview?

    - by 4thSpace
    I have a table view with tall cells. About 300 in height. The cells are custom and have an associated nib. In cellForRowAtIndexPath, I access an object in an array using indexPath.row. The object has properties, which I assign to labels on the custom cell. This works fine for the first two cells. Once I scroll enough for the third cell to get created, the app crashes. I have NSZombieEnabled set and here is the output: 2010-04-19 21:48:13.360 MyApp[54463:207] *** -[CALayer release]: message sent to deallocated instance 0xfc4e50 (gdb) continue 2010-04-19 21:48:18.382 MyApp[54463:207] *** NSInvocation: warning: object 0xfc4e50 of class '_NSZombie_CALayer' does not implement methodSignatureForSelector: -- trouble ahead 2010-04-19 21:48:18.383 MyApp[54463:207] *** NSInvocation: warning: object 0xfc4e50 of class '_NSZombie_CALayer' does not implement doesNotRecognizeSelector: -- abort (gdb) continue Program received signal: “EXC_BAD_ACCESS”. (gdb) I'm not sure what is deallocated. How can I trace this to the source?

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  • iPhone "slide to unlock" animation

    - by Russ
    Any ideas as to how Apple implemented the "slide to unlock" (also, "slide to power off" is another identical example) animation? I thought about some sort of animating mask - but masking is not available on the iPhone OS for performance reasons. Is there some private API effect (like SuckEffect) that they might have used? A spotlight type of effect? Some Core Animation thing? Edit: It's definitely not a series of stills. I've seen examples of being edit a plist value or something and customize the string on jailbroken iphones.

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  • OCUnit testing an embedded framework

    - by d11wtq
    I've added a Unit Test target to my Xcode project but it fails to find my framework when it builds, saying: Test.octest could not be loaded because a link error occurred. It is likely that dyld cannot locate a framework framework or library that the the test bundle was linked against, possibly because the framework or library had an incorrect install path at link time. My framework (the main project target) is designed to be embedded and so has an install path of @executable_path/../Frameworks. I've marked the framework as a direct dependency of the test target and I've added it to the "Link Binary with Libraries" build phase. Additionally I've add a first step (after it's built the dependency) of "Copy Files" which simply copies the framework to the unit test bundle's Frameworks directory. Anyone got any experience on this? I'm not sure what I've missed.

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  • Callback for camera shutter open event

    - by Raj
    Hi all, I have been working around in UIImagePickerController and am struck with a problem where I need to get the precise moment when the camera shutter opens in UIImagePickerController when the source type is set to camera (UIImagePickerControllerSourceTypeCamera). I have done some googling around and have realized that no one had such strange requirement! I looked around the docs of UIImagePickerController and UIImagePickerControllerDelegate hoping to get some delegate method / callback indicating the camera shutter open event, but did not find any. Any suggestions? Thanks for any help, Raj Pawan

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  • CGContext rotation

    - by kasperjj
    I have a 100x100 pixel image that I want to draw at various angles rotated around the center of the image. The following code works, but rotates around the original origo of the coordinate system (upper left hand corner) and not the translated location. Thus the image is not rotated around itself but around the upper left corner of the screen. CGContextRef context = UIGraphicsGetCurrentContext(); CGContextTranslateCTM(context, -50, -50); CGContextRotateCTM (context, 0.3); CGContextTranslateCTM(context,768/2,1024/2); [image drawAtPoint:CGPointMake(0,0)]; I tried doing the same using CGAffineTransform, but got the same results.

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  • Create a screen like the iPhone home screen with Scrollview and Buttons

    - by Anthony Chan
    Hi, I'm working on a project and need to create a screen similar to the iPhone home screen: A scrollview with multiple pages A bunch of icons When not in edit mode, swipe through different pages (even I started the touch on an icon) When not in edit mode, tap an icon to do something When in edit mode, drag the icon to swap places, and even swap to different pages When in edit mode, tap an icon to remove it Previously I read from several forums that I have to subclass UIScrollview in order to have touch input for the UIViews on top of it. So I subclassed it overriding the methods to handle touches: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //If not dragging, send event to next responder if (!self.dragging) [self.nextResponder touchesBegan:touches withEvent:event]; else [super touchesBegan:touches withEvent:event]; } In general I've override the touchesBegan:, touchesMoved: and touchesEnded: methods similarly. Then in the view controller, I added to following code: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; UIView *hitView = (UIView *)touch.view; if ([hitView isKindOfClass:[UIView class]]) { [hitView doSomething]; NSLog(@"touchesBegan"); } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { // Some codes to move the icons NSLog(@"touchesMoved"); } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesEnded"); } When I run the app, I have the touchesBegan method detected correctly. However, when I tried to drag the icon, the icon just moved a tiny bit and then the page started to scroll. In console, it logged with 2 or 3 "touchesMoved" message only. However, I learned from another project that it should logged tonnes of "touchesMoved" message as long as I'm still dragging on the screen. (I'm suspecting I have the delaysContentTouches set to YES, so it delays a little bit when I tried to drag the icons. After that minor delay, it sends to signal back to the scrollview to scroll through the page. Please correct me if I'm wrong.) So if any help on the code to perform the above tasks would be greatly appreciated. I've stuck in this place for nearly a week with no hope. Thanks a lot.

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  • Core data and @unionOfSets

    - by KevinD
    Im having trouble using the @unionOfSets on my core-data objects. NSLog(@"%@", [NSApp valueForKeyPath:@"delegate.mainWindowController.sidebarViewController.arrayController.selection.list.listElement"]); Prints the set of listElements as expected 2010-03-24 18:11:15.844 Pirouette[7459:80f] Relationship objects for {( (entity: PRPlaylistElement; id: 0x10a71b0 ; data: ), (entity: PRPlaylistElement; id: 0x10ac7d0 ; data: ), (entity: PRPlaylistElement; id: 0x10acf60 ; data: ), (entity: PRPlaylistElement; id: 0x10a6850 ; data: ) However when I try to get the set of file objects for each of the list elements. NSLog(@"%@", [NSApp valueForKeyPath:@"delegate.mainWindowController.sidebarViewController.arrayController.selection.list.listElement.@unionOfArrays.file"]); I get the following error 2010-03-24 18:16:45.843 Pirouette[7505:80f] An uncaught exception was raised 2010-03-24 18:16:45.844 Pirouette[7505:80f] [<NSCFSet 0x10415e0> valueForKeyPath:]: this class does not implement the unionOfArrays operation. 2010-03-24 18:16:45.847 Pirouette[7505:80f] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '[<NSCFSet 0x10415e0> valueForKeyPath:]: this class does not implement the unionOfArrays operation.' Confused because I thought calling to-many relationships in core-data were NSSets.

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  • UINavigationBar is getting buttons from another view

    - by Rafael Oliveira
    I have three Views, Splash, Login and List. From Splash I just wait and then Push Login View, with the Navigation Bar hidden. In Login I Show the NavigationBar, hide the BackButton1 and add a new RightButton1, then I check if Settings.bundle "login" and "pass" are set. If so, I push List View. Otherwise I stay in the Login view waiting for the user to fill the form and press a button. In List View I add a new RightButton2 and a new BackButton2. The problem is that if Settings.bundle data is not null, and in Login View I quickly push List View the RightButton1 appears in List View, or no buttons appear at all, or only BackButton2 doesn't appear... The most strange thing of all is that everything was OK and all of sudden it started to get messy. Login View: // Making the Navigation Bar Visible [self.navigationController setNavigationBarHidden:NO animated:NO]; // Hiding the Back Button in THIS view (Login) [self.navigationItem setHidesBackButton:YES]; // Inserting the Logout Button for the Next View (List) UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Logout" style:UIBarButtonItemStylePlain target:nil action:nil]; self.navigationItem.backBarButtonItem = backButton; [backButton release]; UIBarButtonItem* newAccountButton = [[UIBarButtonItem alloc] initWithTitle:@"New Account" style:UIBarButtonItemStylePlain target:self action:@selector(newAccountButtonPressed)]; self.navigationItem.rightBarButtonItem = newAccountButton; [newAccountButton release]; List View // Making the Navigation Bar Visible [self.navigationController setNavigationBarHidden:NO animated:NO]; UIBarButtonItem* aboutButton = [[UIBarButtonItem alloc] initWithTitle:@"About" style:UIBarButtonItemStylePlain target:self action:@selector(aboutButtonPressed)]; self.navigationItem.rightBarButtonItem = aboutButton; [aboutButton release]; Any ideas ?

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  • Getting a WebView to act exactly like Safari

    - by Kelly McDonald
    (edited to give a better description of the answer I gave) I have created a very simple browser in InterfaceBuilder consisting of a nav bar and a webview. Everything works fine except when I try to tab between input fields is the webview, the focus goes to the nav bar. I'm assuming I need to do something with the responder chain, but I haven't been able to figure out what. Any advice? Thanks, Kelly

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