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  • NSArrayController binding : Suppress "No selection"

    - by Holli
    Hello, I have a texfield bound to an ArrayController. The controller key is "selection" because I select items from a NSTableView. But when there are no items in the table the textfield shows the gray text "no selection". How can I suppress this text and have just an empty textfield? Or how can I change the "No selection" text to something else?

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  • MapKit Annotations and User location

    - by teddafan
    Hi all, I followed this tutorial to make my first app: http://icodeblog.com/2009/12/21/introduction-to-mapkit-in-iphone-os-3-0/ I would really like to know how to sort the annotations in the Table in order of distance to the user (the nearest annotation is the first one on the table) How is it possible to do that? I understand that I must use the CLLocation to find the user's location but then I have no idea. Could any one help me? Cheers, Thank you in advance for your much appreciated help, teddafan

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  • A way to enable a LaunchDaemon to output sound?

    - by Varun Mehta
    I have a small Foundation application that checks a website and plays a sound if it sees a certain value. This application successfully plays a sound when I run it as my user from the Terminal. I've configured this app to run as a LaunchDaemon, with the following plist: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>org.myorg.appidentifier</string> <key>ProgramArguments</key> <array> <string>/Users/varunm/path/to/cli/application</string> </array> <key>KeepAlive</key> <true/> <key>RunAtLoad</key> <true/> </dict> </plist> When I have this service launched I can see it successfully read in and log values from the website, but it never generates any sound. The sound files are located in the same directory as the binary, and I use the following code: NSSound *soundToPlay = [[NSSound alloc] initWithContentsOfFile:@"sound.wav" byReference:NO]; [soundToPlay setDelegate:stopper]; [soundToPlay play]; while (g_keepRunning) { [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1.0]]; } [soundToPlay setCurrentTime:0.0]; Is there any way to get my LaunchDaemon application to play sound? This machine gets run by different people, and sometimes has no one logged in, which is why I have to configure it as a LaunchDaemon.

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  • Animating multiple UIViews at once using CoreAnimation

    - by Thomas
    Hi, I'm using a UIImageView as a background-image and placed multiple UIButtons on it. Now I want to move the UIImageView (with all the buttons on it) out of sight with a smooth animation. I couldn't find a container or grouping element in IB, so is there a way to move all the Views at once? Thank you in advance and sorry for my english!

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  • Can I detect if higher subview has been touched?

    - by Kevin Beimers
    I've got a big UIView that responds to touches, and it's covered with lots of little UIViews that respond differently to touches. Is it possible to touch anywhere on screen and slide around, and have each view know if it's being touched? For example, I put my finger down on the upper left and slide toward the lower right. The touchesBegan/Moved is collected by the baseView. As I pass over itemView1, itemView2, and itemView3, control passes to them. If I lift my finger while over itemView2, it performs itemView2's touchesEnded method. If I lift my finger over none of the items, it performs baseView's touchesEnded. At the moment, if I touch down on baseView, touchEnded is always baseView and the higher itemViews are ignored. Any ideas?

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  • My framework will utilise other frameworks, but I'd like this to be transparent to the end-user

    - by d11wtq
    I'm building a framework, which aims to provide a new development environment for the user, but I need to use things like RegexKit and almost certainly some other established frameworks in order to do this. Any functionality exposed from such frameworks would be abstracted through classes and methods in my own framework for maintenance reasons (allowing me to change my mind on which dependencies I want). In an ideal world I just want to ship a single .framework. However I'm aware that unlike with standard bundles and applications it is not possibile to embed a framework inside the framework bundle. Do I have any other option other than to tell the end user that they must also install RegexKit and any other dependencies? I have a feeling this lessens the appeal value of the easy to use embedded framework I'd envisaged building. Right now I'm feeling like I have some limited options: Force the user to install the dependencies. Write my own classes that provide the same functionality -- ugh! If at all possible, try to statically link the third party frameworks (is this possible??) My end-product is ideally a single .framework bundle that uses @rpath and so can be installed in the system or simply bundled with the app that uses it.

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  • Why release the NSURLConnection instance in this statement?

    - by aquaibm
    I read this in a book. -(IBAction) updateTweets { tweetsView.text = @""; [tweetsData release]; tweetsData = [[NSMutableData alloc] init]; NSURL *url = [NSURL URLWithString:@"http://twitter.com/statuses/public_timeline.xml" ]; NSURLRequest *request = [[NSURLRequest alloc] initWithURL: url]; NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [connection release]; [request release]; [activityIndicator startAnimating]; } In this statement,is that correct to release the "connection" instance at that time? After releasing it which means this NSURLConnection instance will be destroyed since it's reference count is 0 ,how are we going to make this connection operation work? THANKS.

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  • How can I check that the NSPasteboard is updated?

    - by Ben Packard
    I'm automating a copy command to place some text on the pasteboard every second or so - unfortunately this is my only way of accessing the text, which is in another application. After copying, I access the pasteboard text and process it. Sometimes, the copy command will be sent when nothing is selected - for example in textEdit, if the cursor is at the end of a line (instead of highlighting some text) and you hit copy, you get a system beep because there is nothing selected to copy. The pasteboard does not update and retains its previous data. I can't think of a creative way to identify when this happens. If I send a copy command and the pasteboard doesn't update, is there any kind of time stamp on the pasteboard I can access that will confirm that something has or hasn't been captured? I was looking at the changeCount, but I'm not sure what that is for exactly, and the documentation didn't help me much - red herring? Any simple and effective ideas gratefully received!

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  • Grand Central Strategy for Opening Multiple Files

    - by user276632
    I have a working implementation using Grand Central dispatch queues that (1) opens a file and computes an OpenSSL DSA hash on "queue1", (2) writing out the hash to a new "side car" file for later verification on "queue2". I would like to open multiple files at the same time, but based on some logic that doesn't "choke" the OS by having 100s of files open and exceeding the hard drive's sustainable output. Photo browsing applications such as iPhoto or Aperture seem to open multiple files and display them, so I'm assuming this can be done. I'm assuming the biggest limitation will be disk I/O, as the application can (in theory) read and write multiple files simultaneously. Any suggestions? TIA

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  • Core data, sorting one-to-many child objects

    - by Shizam
    So if I have a store of parents children and the parent has a one to many relationship to children (parent.children) and they all have first names. Now, on the initial fetch for parents I can specify a sort descriptor to get them back in order of first name but how can I request the children in order? If I do a [parent.children allObjects] it just gives them back in a jumble and I'd have to sort after the fact, every time. Thanks, Sam

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  • Iphone internet connection (Reachability)

    - by ludo
    Hi, I saw any post about Reachability but people doesn't really give the exact answer to the problem. In my application I use the Reachability code from apple and in my appDelegate I use this: -(BOOL)checkInternet { Reachability *reachability = [Reachability reachabilityWithHostName:@"www.google.com"]; NetworkStatus internetStatus = [reachability currentReachabilityStatus]; BOOL internet; if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN)) { internet = NO; }else { internet = YES; } return internet; } So the problem is even if I have an internet connection, this code telling me that I don't have one. Does anyone know what to do to make this working? Thanks,

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  • How can I create "glass" effect on my own UIViews?

    - by lindes
    Hi there, I'm working on an iPhone app that has some non-rectangular UI elements. Currently, I'm subclassing UIView, and in drawRect I'm using a CGPathRef to draw black border and a color-filled interior. I'd like to make these items look more like "buttons", though, so I'd like to have some of the same sort of "glass effects" that are used on e.g. the icons for an iPhone app (when you don't set UIPrerenderedIcon to true), or in other buttons. I hunted around, and found this, which seems to be close to what I need: http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone But I'm having difficulty figuring out how to clip the gradient to my shape. It seems like the mask property on the view would be the right place to go, which seems like it would call for me to create a new CALayer object, with the clipping somehow applied to it. I'm hoping there's some nice convenience function for doing this, though if I need to write something more complicated, that's OK, too. I'm just having difficulty figuring out how to apply the path as a mask. I'm unsure if I need to create a new drawing context and draw the path into it? And then use CGContextClip? I think I've got a lot of the right pieces figured out, I'm just having difficulty understanding how to assemble them. Could someone please point me in the right direction? (I'm happy to read more in the docs, just point me in the right direction, please.)

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  • core-plot barchart does not work!!

    - by user355068
    Hello~ I try to draw bar chart!! numberForPlot is not good work, only CPBarPlotFieldBarLength set. -(NSNumber *)numberForPlot: (CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { NSDecimalNumber *num = nil; NSString *key = (fieldEnum == CPScatterPlotFieldX) ? @"x" : @"y"; if ( [plot isKindOfClass:[CPBarPlot class]] ) { switch ( fieldEnum ) { NSLog(@"fieldEnum = %d",fieldEnum); case CPBarPlotFieldBarLocation: num = (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index]; NSLog(@"CPBarPlotFieldBarLocation return num = %@",num); break; case CPBarPlotFieldBarLength: num = (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger: (index+1)*(index+1)]; if ( [plot.identifier isEqual:Plot3Identity] ) num = [[self.ExForPlot objectAtIndex:index] valueForKey:key]; NSLog(@"CPBarPlotFieldBarLength return num = %@",num); break; } } else { NSLog(@"...??.."); } return num; } # LOG 2010-06-01 02:43:19.424 myHealth[5071:207] CPBarPlotFieldBarLength return num = 0 2010-06-01 02:43:19.425 myHealth[5071:207] CPBarPlotFieldBarLength return num = 0 2010-06-01 02:43:19.425 myHealth[5071:207] CPBarPlotFieldBarLength return num = 30 # EXPlot set // Add some initial data NSMutableArray *contentArray = [NSMutableArray arrayWithCapacity:100]; int prevWeight = 0; int prevBmi = 0 ; if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) == SQLITE_OK) { while (sqlite3_step(statement)==SQLITE_ROW) { id x = [NSNumber numberWithInt:graphTimeStamp]; id y = [NSNumber numberWithInt:sqlite3_column_int(statement, 2)]; [contentArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x, @"x", y, @"y", nil]]; } self.ExForPlot = contentArray;

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  • cocoa hello world screensaver

    - by RW
    I have been studying NSView and as such I thought I would give a shot at a screen saver. I have been able to display and image in an NSView but I can't seen to modify this example code to display a simple picture in ScreenSaverView. http://www.mactech.com/articles/mactech/Vol.20/20.06/ScreenSaversInCocoa/ BTW great tutorial that works with Snow Leopard. I would think to simply display an image I would need something that looked like this... What am I doing wrong? // // try_screensaverView.m // try screensaver // #import "try_screensaverView.h" @implementation try_screensaverView - (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview { self = [super initWithFrame:frame isPreview:isPreview]; if (self) { [self setAnimationTimeInterval:1]; //refresh once per sec } return self; } - (void)startAnimation { [super startAnimation]; NSString *path = [[NSBundle mainBundle] pathForResource:@"leaf" ofType:@"JPG" inDirectory:@""]; image = [[NSImage alloc] initWithContentsOfFile:path]; } - (void)stopAnimation { [super stopAnimation]; } - (void)drawRect:(NSRect)rect { [super drawRect:rect]; } - (void)animateOneFrame { ////////////////////////////////////////////////////////// //load image and display This does not scale the image NSRect bounds = [self bounds]; NSSize newSize; newSize.width = bounds.size.width; newSize.height = bounds.size.height; [image setSize:newSize]; NSRect imageRect; imageRect.origin = NSZeroPoint; imageRect.size = [image size]; NSRect drawingRect = imageRect; [image drawInRect:drawingRect fromRect:imageRect operation:NSCompositeSourceOver fraction:1]; } - (BOOL)hasConfigureSheet { return NO; } - (NSWindow*)configureSheet { return nil; } @end

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  • What do I need to implement a basic map framework?

    - by Mickey Shine
    I am doing iPhone development and what I want is a custom map framework (not route-me, not Google Maps). So far I found CATiledLayer and UISCrollView is helpful. But I am still not clear about the stuff(any kind of view, or anything from CoreAnimation framework, or anything else?) which would be perfectly fit this. I need some guidance of making a custom map framework from scratch. Thank you

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  • How to control a NSView, located in a dedicated NSWindow, from the main NSWindow designed to support

    - by Michael
    Hi, This is probably a simple problem for the high skilled Cocoa programmers, but I can't find how to control the graph in a separate window. I read carefully the Cocoa related books, go through many web notes,but I can't find a solution to my problem. The purpose is to use a dedicated window to draw the I=F(Vg) curves extracted by the GUI from a specific hardware. All the GUI and the hardware works fine ( thanks to the help provided by several members of stackoverflow) , but no way to send the parameters to the NSView to display the results. So far, the GUI class is based on a NSObject, the graphic class is NSView. Any idea, examples, links will be appreciated. Thank you so much. Michael

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  • Is it possible to do some interop with iWork?

    - by Alerty
    I know it is possible with the .NET framework of Microsoft to do some interoperability with Microsoft Office. Is there something that exist that resembles to it for iWork and the Cocoa framework? Edit: Here are more details. I would like to create an application that has a GUI and that can generate Pages/Keynote/Numbers documents.

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  • Add shading to clipped UIView

    - by huggie
    I'm creating an iphone application. I have this UIView whose content is clipped with a path. I want to add shading and/or shadow to it. What's the best way to do this? For shadow, I tried CGContextSetShadow() but it doesn't seem to have an effect (perhaps it's drawing outside the shown region?) . How about shading? I want it to appear along the path. What's the best way to go about it? Is it to create another narrow clip strip along the original clipping path (if it's possible to have two clip path... ) Or does this need to be done in another CALayer? I am not even sure what that is yet.

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  • Enable access for assistive device programmatically

    - by Dheeraj
    Hi All, I want to enable Access for assistive devices in System Preferences programmatically. But Problem is that my application is not running as root user and i do not want my application to be as root user and also should not ask for any authentication in between. I want to tap all keyboard events globally. I am using CGEventTapCreate() for the same.In the documentation of CGEventTapCreate() API it is mentioned that, Event taps receive key up and key down events if one of the following conditions is true: The current process is running as the root user. Access for assistive devices is enabled. In Mac OS X v10.4 & later, you can enable this feature using System Preferences, Universal Access panel, Keyboard view. I tried manually by checking the Enable Access for assistive devices from System Preference and it gives me expected output. So is there any way to do the same via program without asking for authentication and also application is not running as root user? Thanks, Dheeraj.

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  • NSNumberFormatter to display custom labels for 10^n (10000 -> 10k)

    - by Michele Colombo
    I need to display numbers on a plot axis. The values could change but I want to avoid too long numbers that will ruin the readability of the graph. My thought was to group every 3 characters and substitute them with K, M and so on (or a custom character). So: 1 - 1, 999 - 999, 1.000 - 1k, 1.200 - 1.2k, 1.280 - 1.2k, 12.800 - 12.8k, 999.999 - 999.9k, 1.000.000 - 1M, ... Note that probably I'll only need to format round numbers (1, 10, 1000, 1500, 2000, 10000, 20000, 30000, 100000, ...). Is that possibile with NSNumberFormatter? I saw that it has a setFormat method but I don't know how much customizable it is. I'm using NSNumberFormatter cause the graph object I use wants it to set label format and I want to avoid changing my data to set the label.

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  • iPhone Pong Advanced Deflection Angle

    - by CherryBun
    Hi, I am currently developing a simple Pong game for the iPhone. Currently using CGRectIntersectsRect for the collision detection and as for the deflection of the ball when it hits the paddle, I just multiply the ball velocity with -1 (therefore reversing the direction of the ball). What I am trying to do is to make it so that when the ball hits the paddle, it checks whether how far is the ball from the center of the paddle, and increases the deflection angle the further the ball is away from the center of the paddle. (E.g. In this case, the ball will be deflected back at 90 degrees no matter where it came from, as long as it hits the center of the paddle) How am I suppose to do that? Any help would be greatly appreciated. Thank you.

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  • Capturing a NSParseErrorException

    - by Martin
    Could someone tell me how I can capture a NSParseErrorException? The Situation: my app downloads a small .plist file. I convert this into dictionary using the string method -propertylist. This normally works fine. I check for a connection before going to retrieve the file, so it works fine if I've got a connection to the internet, and works fine when I don't. However, I discovered a use case that crashes. If I'm at location that requires authetication before connecting to the internet (at Starbucks, say) what's being returned by the app isn't a plist and the attempt to parse it causes the application to crash. So is there a way to transform my code so that the NSParseErrorException is caught and rather than crashing the program I can just skip over this piece of code? NSDictionary *temp = [myDownloadString propertyList]; I tried doing this if ([myDownloadString propertyList]==NSParseErrorException){ //do something } but that didn't work.

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  • Static library woes in iPhone 3.x with categories and C libraries

    - by hgpc
    I have a static library (let's call it S) that uses a category (NSData+Base64 from MGTwitterEngine) and a C library (MiniZip wrapped by ZipArchive). This static library is used in an iPhone 3.x project (let's call it A). To be able to use the MiniZip library I included its files in project A as well as the static library S. If not I get compilation errors. Project A works fine on the simulator. When I run it on the device, I get unrecognized selector errors when the category is used. As pointed out here, it seems there's a linker bug that affects categories in iPhone 3.x (http://stackoverflow.com/questions/1147676/categories-in-static-library-for-iphone-device-3-0). The workaround is to add -all_load to the Other Linker Flags of the project that references the static library. However, if I do this then I get duplicate symbol errors because I included the MiniZip libraries in project A. A workaround is to include the category files in project A as well. If I do this, project A works well in the device, but fails to build on the simulator because of duplicate symbol errors. How should I set up project A to make it work on the simulator and the device with the same configuration?

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