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• Is there an easy way to do click-and-drag scrolling in text frames?

  - by Skilldrick

  I have a div with overflow:auto and a scroll bar, and I'd like to be able to drag the contents to scroll. I don't need to be able to select text. Is there an easy way to do this? A jQuery plugin would be good, otherwise plain old JavaScript would be fine. It seems I haven't made myself clear enough. There's a div with a fixed height that I want to scroll. Instead of picking up the scroll bar, I want to click and drag inside the text in the opposite direction. Like on an iPhone. Like in Photoshop when you hold down space and drag. ------------------- | | | | | | | ||| | | | | <----------- click here and drag to scroll. | | | | | | -------------------

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• Delegates vs. events in Cocoa

  - by aaronstacy

  I'm writing my first iPhone app, and I've been exploring the design patterns in Cocoa and Objective-C. I come from a background of client-side web development, so I'm trying to wrap my head around delegates. Specifically, I don't see why delegate objects are needed instead of event handlers. For instance, when the user presses a button, it is handled with an event (UITouchUpInside), but when the user finishes inputting to a text box and closes it with the 'Done' button, the action is handled by calling a method on the text box's delegate (textFieldShouldReturn). Why use a delegate method instead of an event? I also notice this in the view controller with the viewDidLoad method. Why not just use events?

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• How to check using a script if project is opened in XCode?

  - by delirus

  Hi, I'd like to introduce build number feature for my iPhone project and increase it automatically with every commit to my git repo. I plan to do it using Apple's agvtool, which recommends that project is not opened in XCode at the time So my questions are: 1) So far I know that I need to make an executable script from .git/hooks/pre-commit.sample. How to do the scripting to check if certain project is opened in XCode? 2) pre-commit.sh will be executed upon calling git commit with no args, so whenever someone will commit with -a option, I won't have my build number updated. Is there any way to workaround this? Cheers

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• kCGImagePropertyIPTCKeywords problem

  - by deepa

  Hi, I am developing an iPhone app in which I want to set the keywords for an image using ImageIO.framework. Following is the code snippet that I use for setting the keywords. But, it does not apply the keywords to image meta data. Could some one help me out in finding the problem here. NSMutableDictionary *iptcDictionary = [NSDictionary dictionaryWithObject: [NSArray arrayWithObject: @"Test"] forKey:(NSString *)kCGImagePropertyIPTCKeywords]; NSDictionary *newImageProperties = [NSDictionary dictionaryWithObject:iptcDictionary forKey:(NSString *)kCGImagePropertyIPTCDictionary]; CGImageSourceRef imageSource=CGImageSourceCreateWithURL((CFURLRef)imageURL, nil); //imageURL is URL of source image CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData( (CFMutableDataRef)newImageFileData, CGImageSourceGetType(imageSource), 1,NULL); CGImageDestinationAddImageFromSource(imageDestination, imageSource, 0, (CFDictionaryRef) newImageProperties); if (CGImageDestinationFinalize(imageDestination)) [newImageFileData writeToFile:imagePath atomically:YES]; //imagePath is the path of the destination image with new metadata Thanks and regards, Deepa

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• Tutorials for an experienced C# user to learn C++

  - by Tim R.

  Are there any good resources for learning C++ that a C# user could use, which don't require knowledge of C? I have quite a good knowledge of C# via courses in my University's game development program (in a 300 level course right now) but now I need to use C++ for a project. I would use a beginner tutorial but they are so hard for me to follow and learn the basic syntax because they start so slowly. I found a few of tutorials for switching from C++ to C#, but none in the other direction. I do have a little bit of Objective C practice from iPhone programming as well.

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• Restoring a saved opengl ES buffer (i.e. writing it back to screen)

  - by Adam

  I'm writing an iPhone app where I need to save and load the screen contents. I was able to save the screen using glReadPixels(), but since there's no glDrawPixels() in openGL ES, I'm having a lot of trouble restoring that buffer to the screen. I gather that I need to save the screen as a texture: http://stackoverflow.com/questions/708760/what-is-the-equivalent-of-gldrawpixels-in-opengl-es-1-1 But I'm not sure how to implement this. Does anyone have or know of any code samples that do this? I'm an openGL noob, so any help would be greatly appreciated :)

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• Why isn't my javascript working on a local HTML file using UIWebView loadRequest:?

  - by Raphael

  Hi Everyone, I have a script that generates a temporary HTML file that has links to external Javascript files that it requires to run. <script src="file:///Users/raphaeldefranco/Library/Application Support/iPhone Simulator/User/Applications/BA9E724E-76BD-4F28-B224-54B4C73786D6/LogTen.app/Reports/Time by Year/../../Tools/PlotKit/Base.js" type="text/javascript"></script> The links are absolute and they are to the right place (There is a CSS link as well that uses the same method and it works fine). I've been using the following, which finds images and CSS just fine but for some reason won't run the .js. [webView loadRequest:requestObj]; I've tried changing the encoding of the files. I had a problem getting the CSS to work until the file was in unicode, but so far no luck. All the Script files are bundled with my project etc. Thanks in advance!

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• How could I use AJAX to create a Json data source .txt file?

  - by Adam

  I'm creating a form that collects standard information about customers. When the user hits save, I would like to create a .txt file that would be used to later retrieve all of the data collected from customers. I'm using DataTables which is a jQuery plugin to display the data. The .txt file would be formatted to be saved as such: { "aaData": [ ["client 1 name","address","city","state","zip"], ["client 2 name","address","city","state","zip"], ["client 3 name","address","city","state","zip"], ... ["client x name","address","city","state","zip"] ] } Where "aaData": is used by DataTables. This is going to part of an iPhone app, so the data source has to be very small and not reliant on a constant connection to a server, so, essentially, a client-side data source. The .txt file has to also be updated when edited and saved, and then replaced every time it is downloaded.

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• Arry of pointers in objective c using NSArray

  - by Amir

  Hello, I am writting program for my iphone and have a qestion. lets say i have class named my_obj class my_obj { NSString *name; NSinteger *id; NSinteger *foo; NSString *boo; } now i allocate 100 objects from type my_obj and insert them to array from type NSArray. then i want to sort the Array in two different ways. one by the name and the second by the id. i want to allocate another two arrays from type NSArray *arraySortByName *arraySortById what i need to do if i just want the sorted arrays to be referenced to the original array so i will get two sorted arrays that point to the original array (that didnt changed!) i other word i dont want to allocate another 100 objects to each sorted array.

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• Dropdowns don't work on webOS with PhoneGap?

  - by Steve Nay

  I'm trying to use a dropdown in a PhoneGap app I'm writing. It uses a simple <select>: <select> <option value="1">First</option> <option value="2">Second</option> </select> This works fine on Android and the iPhone (including behaving like a native drop-down would on those systems). However, it doesn't appear to work on webOS (neither the Palm Pre itself nor the emulator). The <select> displays properly on the screen, but when I tap on it, nothing happens--I'm not able to make a selection from the dropdown. Why might this be?

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• Any idea about WPF ScrollViewer to make it smooth scroolling like Android?

  - by jimi

  I have trying a simple ScrollViewer in xaml like below: <ScrollViewer Height="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type StackPanel}}, Path=Height}" ScrollViewer.VerticalScrollBarVisibility="Visible" CanContentScroll="True"> <DockPanel> <StackPanel Name="StackPanel1" OverridesDefaultStyle="False" Width="230" Height="803" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="23,1,0,0"> ....Something here ....Something here ....Something here </StackPanel> </DockPanel> </ScrollViewer> But my question is..is it possible for us to create any smooth scrolling likes any android or iphone using WPF? Any ideas?

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• how to scroll table on the click event of some cell in objective c?

  - by Sarah

  Hello friends, I am right now working with one application where i need to take one uitableview with uilable and textfield in each cell.I am able to scroll the table manually once the user starts writing, but what i want is that when i click on the textfield,the table should scroll upward so that the user is able to see what he has entered in the textfield.Same thing i saw once i logged in the iphone facebook. this is the code for manually scrolling the table : - (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section { return 250; } -(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section { CGRect viewRect = CGRectMake(0, 0, 320, 160); UIView *footerView = [[UIView alloc] initWithFrame:viewRect]; return footerView; } Is there any way around? Thanks in advance.

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• How can I know if a computer supports hardware-assisted virtualization before I purchase the computer?

  - by Poaters

  I'm an iPhone programmer who is no longer in possession of a personal Mac computer on which to use XCode. I have two Windows desktops, and I would like to run OS X in VMWare rather than purchase Apple's expensive hardware. However, neither of my machines supports hardware-assisted virtualization, which is required to virtualize OS X. I went shopping online for a computer today, since I've been planning to purchase a laptop anyway, but sites like Best Buy don't appear to give any indication of whether or not a product supports this. Is there any other site out there or some trick to figuring this out other than buying the machine and running Microsoft's nifty little detection tool?

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• What motivates people to learn a new programming language?

  - by szabgab

  There are plenty of question asking Which Programming Language Should I Learn? but I have not found an answer yet to the question what really motivates people to learn a specific new language?. There are the people who think they should learn a new language every year for educational purpose. How do they decide on the languages to be learned? Then I guess there are people who learn a new language because people around them told it is a fun language and they can build nice things with it. Of course if the current job requires it people would learn a new language but I think if the language seems to have a potential to earn money (e.g. There are plenty of jobs in Java or ObjectiveC can be used to write apps for the iPhone and make money). So why are you learning a new language or why have you learned the languages you know?

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• Django AND .htaccess rewrites/redirects, is this possible?

  - by Infinity

  Is it possible to have Apache htaccess rewrites take effect before it hits django? For example so I can redirect iPhone users to a completely different domain without even hitting django. We're using apache2 with mod_wsgi and the apache vhost looks like this: <VirtualHost *:80> DocumentRoot /usr/local/www/site/static Alias /css/ /usr/local/www/site/static/css/ Alias /js/ /usr/local/www/site/static/js/ Alias /img/ /usr/local/www/site/static/img/ Alias /flash/ /usr/local/www/site/static/flash/ <Directory /usr/local/www/site/static> AllowOverride All Order allow,deny Allow from all </Directory> WSGIDaemonProcess mallorca-site threads=15 WSGIScriptAlias / /usr/local/www/site/config/dev/dev.wsgi </VirtualHost> Thanks

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• Debuggin in Xcode

  - by huggie

  I'm toying with iPhone app development. Often times I would run into runtime error and I would have no idea where the error occurs (e.g. the exact line). In console app with GCC I could at least compile with the -g flag. dump a core file and read that core file in to get to the last line that got into trouble. But how would I do that in Xcode? Build and Debug doesn't seem to have the debugging symbol loaded.

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• I want my footer to be like this one

  - by Jsmith

  http://developer.apple.com/iphone/library/navigation/index.html?section=Resource+Types&topic=Getting+Started Can I have some code ? This one appears to have a scroller to the right side of the screen and the footer gets sticky to the bottom. But i guess this is a bit different to most of the Sticky footers you're talking about in other threads. I'm going to need some good code to use, as I can't think alike other people and I learn from used code. Iwill be happy to help other people too ...

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• Beginner: Best Practices in an Android App UI Navagation

  - by AndyD273

  I am trying to learn how to do stuff in Android, and I'm not sure of the best way to build the interface. I've been working on porting an iPhone app, which uses navigation controllers and table views for looking at the different sections: basically, someone touches a cell in the table, which drills down to another table. when they touch a cell on that table it drills down to a webview that displays the information. I want to do something similar for the android app, but I don't know how, or if there is a better way native to Android. I've figured out how to use the webview to my purposes, but moving forward and backward in the table tree is unclear.

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• Basic Objective-C syntax: "%@"?

  - by cksubs

  Hi, I'm working through the Stanford iPhone podcasts and have some basic questions. The first: why is there no easy string concatenation? (or am I just missing it?) I needed help with the NSLog below, and have no idea what it's currently doing (the %@ part). Do you just substitute those in wherever you need concatenation, and then comma separate the values at the end? NSString *path = @"~"; NSString *absolutePath = [path stringByExpandingTildeInPath]; NSLog(@"My home folder is at '%@'", absolutePath); whereas with any other programing language I'd have done it like this: NSLog(@"My home folder is at " + absolutePath); Thanks! (Additionally, any good guides/references for someone familiar with Java/C#/etc style syntax transitioning to Objective-C?)

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• How to simulate :active css pseudo class in android on non-link elements?

  - by chas s.

  I'd like to be able to mimic the behavior of the :active pseudo class on all elements in Android webkit. Currently, the :active syntax only works on a elements (links). Nearly all of the actionable elements in the app I'm working on are something other than a standard link tag. iOS webkit supports :active on all elements. /* works on both android iOS webkit */ a:active { color: blue; } /* works on iOS webkit, does not work on android webkit */ div:active { color: red; } I've found a couple of resources [1,2] that solve similar problems, but they're both a bit heavy, and I'm wondering if there's a lighter weight solution that I'm just not able to find. http://cubiq.org/remove-onclick-delay-on-webkit-for-iphone http://code.google.com/intl/ro-RO/mobile/articles/fast_buttons.html

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• Can Apache configuration check cookies?

  - by nickf

  My situation: We have a mobile version of our website, and want to start redirecting mobile users to it. The plan is to do this in Apache httpd.conf or .htaccess, using something like this: RewriteEngine On RewriteCond %{HTTP_USER_AGENT} (iPhone|Blackberry|...) RewriteRule (.*) mobile/$1 However we want there to be a way for users to override our default action of redirecting them. One way we thought to do it was to show a link on the mobile site directing back to the regular site, and store a cookie when they use that link. Could the Apache configuration file check a cookie before redirecting? Is there a better way?

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• Using View multiple times in Interface Builder

  - by user1396236

  I'm using a UITableview and have a custom Cell with some labels. I set up all the constraints in Interface Builder. Now I'm using this Cell multiple times, I just copied it in IB. Now it's the time to change some of these contraints because of some bugs (I'm converting a iPhone App to an Universal). But it can't be right that I now have to set the constraints manually for every cell? How do I do right? If I want to control the constraints in one central place, do I have to set them up in Code? I would really not like that! Thanks in advance.

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• Storing tree data in Javascript

  - by Ozh

  I need to store data to represent this: Water + Fire = Steam Water + Earth = Mud Mud + Fire = Rock The goal is the following: I have draggable HTML divs, and when <div id="Fire"> and <div id="Mud"> overlap, I add <div id="Rock"> to the screen. Ever played Alchemy on iPhone or Android? Same stuff Right now, the way I'm doing this is a JS object : var stuff = { 'Steam' : { needs: [ 'Water', 'Fire'] }, 'Mud' : { needs: [ 'Water', 'Earth'] }, 'Rock' : { needs: [ 'Mud', 'Fire'] }, // etc... }; and every time a div overlaps with another one, I traverse the object keys and check the 'needs' array. I can deal with that structure but I was wondering if I could do any better? Edit: I should add that I also need to store a few other things, like a short description or an icon name. So typicall I have Steam: { needs: [ array ], desc: "short desc", icon:"steam.png"},

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• add component in bottom of android screen.

  - by milind

  hello all. i m new in android developing. i want to create custom tab bar in android like Iphone tab bar. i have found so much example to done this. but i would like to use only one XML file for tab bar and after include these to screens. i think it is possible with the help of layout but i don't have much idea. if there are only one property of layout there implement component at the bottom. if anybody done this please provide some idea. Thanks

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• Android App: Proximity

  - by Eclipser

  Is there an API for Android that will find other people nearby running the same app? For instance, if you were to perform a "scan" it tries to find other people running the same app nearby. Would it be possible to perform the same task across multiple OS (Android, iPhone, Windows, etc.)? Or would the best way be to just have the app communicate to a server your location and have a server-side app that pushes a list of others nearby??? My goal is to find an easy way to eventually transmit data between two devices contigent on those that are nearby.

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