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  • What are the major challenges in creating a platform such as StackOverflow?

    - by gablin
    Let us assume you were to create a platform such as StackOverflow. It needs to be functional, fast and scalable, just like SO, in order to be successful. What are the major challenges you would face in such a task? I'm looking for technical challenges rather than problems such as how to advertise it and stuff like that. (I'm not looking for ways of creating a new site to challenge SO; I'm just interested in how difficult it would be to create it if it didn't already exist.)

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  • Navigation bar's buttons tint color sometimes not set

    - by Felipe
    Refer to the following, short video: http://screencast.com/t/cmnsqVTh The problem is with the color of a navigation bar's back button. The first time I load the app, the navigation bar + its buttons have the default color. I then push a view controller on the stack, and when the new view loads (in the viewDidLoad method), it sets the navigation bar's tint color to pink. The nav bar's buttons are also pink as expected. I then press the back button, and the view is popped from the stack. On the root view controller's viewWillAppear method I set the tint color back to nil so that it's the default color again. The navigation bar looks as expected. However if I push the view controller on the stack yet again, the navigation bar's tint color is pink, but the back button's color is the default light blue. Hope that was understandable. So what's the cause of the problem?

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  • Can I push a modal view controller from within another modal view controller?

    - by Andy
    I've got a rootViewController that, at one point, displays a peoplePickerNavigationController. I'm trying to push a second view controller when my user selects a specific contact property, like so: -(BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)picker shouldContinueAfterSelectingPerson:(ABPersonRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier { RuleBuilder *ruleBuilder = [[RuleBuilder alloc] initWithNibName:@"RuleBuilder" bundle:nil]; [self pushModalViewController:ruleBuilder animated:YES]; [ruleBuilder release]; return NO; } This compiles just fine, but when I run the code in the simulator and run through the peoplePicker, nothing happens when I select a contact property. On a whim, I added a [self dismissModalViewControllerAnimated:YES]; just before [ruleBuilder release]; and that dismisses the peoplePicker, but otherwise has no effect on my missing ruleBuilder. Any ideas?

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  • UITextView Scrolling - Artificial Limit

    - by Matt Winters
    I have a UITextView with a height of let's say 300. What I would like is when the typed text gets to the half way point, for the scrolling to start as if it were at the bottom of the textView. Basically I would like to programmatically set the point within the textView for scrolling to begin. Any ideas? Thanks.

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  • Differentiating Between UITouch Objects On The iPhone

    - by Jasarien
    Hey guys, I'm trying to differentiate between two (or more) UITouch objects on the iPhone. Specifically, I'd like to know the order in which the touches occurred. For instance, in my -touchesBegan:withEvent: method I get an NSSet of UITouch objects. Now I can find out how many touches there are, but, which object represents which finger? I notice the timestamp property on UITouch - is this what I'm looking for? I see how that would be useful to obtaining the last or first touch - providing the touches don't mutate... Therein lies my problem. I can use the timestamp to single out the latest touch, but then the touch that occurred first moves, and IT becomes the latest touch... At the end of this exercise, I'd like to be able to implement the "pinch" gesture to zoom in or out, etc. Any help would be greatly appreciated, thanks.

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  • View controller is drawing under my navigation bar after popping ttthumbsviewcontroller

    - by scootklein
    I'm implementing the TTThumbsViewController from the Three20 project and things are finally starting to take shape. I push the TTThumbsViewController from the current view controller by just pushing it onto the current stack and animate the transition (common navigation controller push). My problem is that when I pop the TThumbsViewController view controller, the navigation controller is stuck in a mode where its view controllers are drawn UNDER the navigation bar (which is now translucent). Start Push Pop

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  • Possible to use Buddypress within an iPhone app?

    - by lostInTransit
    Hi I want to create a community for my venture and also an iphone application for the same. I am thinking of using Buddypress for the community. But is it possible to use buddypress with an iPhone app? I'd like that when user posts a message via the iPhone app, it is also posted on buddypress? Or do I have to write custom scripts for editing the buddypress db according to user actions in the iPhone app? Thanks.

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  • Initialize preferences from XML in main Activity

    - by pixel
    My problem is that when I start application and user didn't open my PreferenceActivity so when I retrieve them don't get any default values defined in my preference.xml file. preference.xml file: <?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:key="applicationPreference" android:title="@string/config" > <ListPreference android:key="pref1" android:defaultValue="default" android:title="Title" android:summary="Summary" android:entries="@array/entry_names" android:entryValues="@array/entry_values" android:dialogTitle="@string/dialog_title" /> </PreferenceScreen> Snippet from my main Activity (onCreate method): SharedPreferences appPreferences = PreferenceManager.getDefaultSharedPreferences(this); String pref1 = appPreferences.getString("pref1", null); In result I end up with a null value.

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  • iPhone: Utility Application - Open Flipside on startup

    - by Joel
    I have an application that I started with the Utility Application template. I'm using the Flipside for the Settings screen. I'm having the settings serialized to a file when the app is closed and deserialized when the app is opened. If there is no file to deserialize at startup, I want the flipside to be shown so the user can enter required information. This is what I have: - (void)viewDidLoad { flipController = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil]; flipController.delegate = self; flipController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; if(![self deserialize]) { [self showInfo]; } } - (IBAction)showInfo { [self presentModalViewController:flipController animated:YES]; } showInfo is the method that is called with the little 'i' button is pressed on the MainView. The button works, however my call in viewDidLoad doesn't. I have run through my code with the debugger. [self deserialize] is returning NO and [self showInfo] is being called, and I checked if flipController is nil in that context, and it's not. I've searched around and couldn't find anyone who's tried to do the same thing. I'm stumped to as why this isn't working. Anyone see what I'm doing wrong? Thanks

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  • touchesEnded not being called??? or randomly being called

    - by Rob
    If I lift my finger up off the first touch, then it will recognize the next touch just fine. It's only when I hold my first touch down continuously and then try and touch a different area with a different finger at the same time. It will then incorrectly register that second touch as being from the first touch again. Update It has something to do with touchesEnded not being called until the very LAST touch has ended (it doesn't care if you already had 5 other touches end before you finally let go of the last one... it calls them all to end once the very last touch ends) - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch* touch = [touches anyObject]; NSString* filename = [listOfStuff objectAtIndex:[touch view].tag]; // do something with the filename now } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { ITouch* touch = [touches anyObject]; NSString* buttonPressed = [listOfStuff objectAtIndex:[touch view].tag]; // do something with this info now }

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  • UIRotationGestureRecognizer minimum rotation value

    - by dc
    Is it possible to set a minimum rotation value necessary for a UIRotationGestureRecognizer to transition into UIGestureRecognizerStateRecognized? I'm using multiple recognizers, and my UIRotationGestureRecognizer keeps getting called with a very small rotation (Between 1 and 15 degrees either direction) rather than my UIPinchGestureRecognizer. What I'd like to do is only have the rotation be called if the rotation is within a certain range, otherwise cancel it and let the pinch be called.

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  • NSAlert doesn't work

    - by Marco
    Hello i have implemented the following NSAlert: NSString *title = [NSString stringWithFormat:@"Keine Internetverbindung"]; NSString *alertMessage = [NSString stringWithFormat:@"Es konnte keine Verbindung zu www.sip.de aufgebaut werden!"]; NSString *ok = [NSString stringWithFormat:@"Ok"]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:alertMessage delegate:self cancelButtonTitle:ok otherButtonTitles:nil]; [alert show]; [alert release]; and this is the delegate method to close the app: - (void)alertView:(UIAlertView *)alertView didDisMissWithButtonIndex:(NSInteger)buttonIndex{ exit(3); } But why the programm doesn't go into the method, what is my mistake? greetings Marco

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  • Yet another UITableView Question

    - by barbgal
    Hi, I have a strange issue in my iPhone application. I have created a UITableView with 4 Sections and 3 Rows so totally 12 Rows. But - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath The above method only gets called for 9 times instead of 12 times.why this happenning. My 4th section is not getting constructed but my 1st section gets duplicated as 4th section. Thanks for your time and help. Plese refer my code below @interface MainViewController : UITableViewController<UITextFieldDelegate,UITableViewDelegate,UITableViewDataSource> { } @end // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { CGRect frameRect = CGRectMake(0,0,320,460); UITableView *tableView = [[UITableView alloc] initWithFrame:frameRect style:UITableViewStyleGrouped]; tableView.delegate = self; tableView.dataSource = self; tableView.backgroundColor = [UIColor purpleColor]; tableView.scrollEnabled = YES; self.view = tableView; [tableView release]; [super viewDidLoad]; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. return 3; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 4; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"CELL IS NIL %i", indexPath.section); static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; if (indexPath.section == 0) { if(indexPath.row == 0) { cell.text = @"Tmail"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else if ( indexPath.row == 1 ) { cell.text = @"English"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else { cell.text = @"Hindi"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } } else if (indexPath.section == 1) { if(indexPath.row == 0) { cell.text = @"Street"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else if ( indexPath.row == 1 ) { cell.text = @"City"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else { cell.text = @"State"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } } else if (indexPath.section == 2) { if(indexPath.row == 0) { cell.text = @"Salem"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else if ( indexPath.row == 1 ) { cell.text = @"Samalpatti"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else { cell.text = @"Chennai"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } } else if (indexPath.section == 3) { if(indexPath.row == 0) { cell.text = @"NOKIA"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else if ( indexPath.row == 1) { cell.text = @"SAMSUNG"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } else { cell.text = @"SONY"; UITextField *aField = [[UITextField alloc]initWithFrame:CGRectMake(100,10,200,40)]; aField.placeholder = @"Mandatory"; aField.delegate = self; aField.textColor = [UIColor blackColor]; [cell addSubview:aField]; [aField release]; } } } return cell; }

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  • How to get the same UITableViewCell layout as in the Address Book app?

    - by Romain
    Hi, I currently have a custom UITableViewCell which contains a few labels, and an image. The "main" label is used to display people's names. Currently, I'm styling it in bold text. What I'd like to do (to gain some space and readability), is to mimic the Address Book app cell style, that is: first name in light text, and family name in bold text. Is there a way to do this using the same UILabel? Or, should I use 2 different UILabels? How should I layout them, without knowing their sizes? Thanks in advance for your assistance!

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  • Great UIKit/Objective-C code snippets

    - by Nissan Fan
    New to Objective-C iPhone/iPod touch/iPad development, but I'm starting to discover lots of power in one-liners of code such as this: [UIApplication sharedApplication].applicationIconBadgeNumber = 10; Which will display that distinctive red notification badge on your app iphone with the number 10. Please share you favorite one or two-liners in Objective-C for the iPhone/iPod touch/iPad here. PUBLIC APIs ONLY.

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  • scroll image using UIscrollview

    - by summer
    i looked at the example from the iphone dev: http://developer.apple.com/iphone/library/samplecode/Scrolling/index.html everything looks cool except that for 5 image they set the "const NSUInteger kNumImages = 5;" what happens is that what if i have 1000 images?and i wan to view it without having to change the number everytime?also if i will to set the number to 1000 and i have only 10 images then in the simulator the user can scroll "blank view" till it reaches count 1000! help please..thanks

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  • Using regexkitlite with strings containing % signs

    - by David Liu
    So I'm using RegexKitLite in my iPhone app, and I'm basically grabbing out a bunch of URLs and names from within a web page. The problem is that whenever it comes across a URL with URL encoded characters like %22 for a double quote or %27 for a single quote, the captured string basically gives me a jumbled overflowed string, containing garbage and even method names. I'm really not doing anything particularly special within the regex, just your basic "startdelimiter(.*)enddelimiter" regex.

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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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  • is there a default back key(on device) listener in android???

    - by androidbase Praveen
    hi all, i am having two activities A and B. when i click the button in A that will shows B. when i click the Button in B it backs to A. i had set the overridePendingTransition method after the finish() method. it works properly. but in case the current Activity is B. on that time i click the default back button in the device. it shows the right to left transition to show the Activity A. how i can listen that Default back key on device.?????

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  • How can we change color of a text programmatically ?

    - by user297535
    My code is -(UIImage *)addText:(UIImage *)img text:(NSString *)text1{ int w = img.size.width; int h = img.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage); CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1); char* text = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding]; CGContextSelectFont(context, "Arial", 18, kCGEncodingMacRoman); CGContextSetTextDrawingMode(context, kCGTextFill); CGContextSetRGBFillColor(context, 255, 255, 255, 2); CGContextShowTextAtPoint(context, 10, 170, text, strlen(text)); CGImageRef imageMasked = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:imageMasked]; } -(UIImage *)addText:(UIImage *)img text:(NSString *)text1{ int w = img.size.width; int h = img.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage); CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1); char* text = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding]; CGContextSelectFont(context, "Arial", 18, kCGEncodingMacRoman); CGContextSetTextDrawingMode(context, kCGTextFill); CGContextSetRGBFillColor(context, 255, 255, 255, 2); CGContextShowTextAtPoint(context, 10, 170, text, strlen(text)); CGImageRef imageMasked = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:imageMasked]; } How can we change the color of the text programmatically? Answers will be greatly appreciated!

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  • Mapkit: Only show annotations in current view

    - by Nic Hubbard
    Instead of loading all annotations that are in my array, I would only like to load the annotations that the user could currently see cased on how far they are zoomed in on the map. So, if the user pans to a place where there are annotations, those would be added, and if they pan away, those would be removed. I assume this would help with memory. Does anyone know how to do something like this? And, is it worth it, or needed?

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  • how to send sms programmatically in iphone 2.0

    - by MaheshBabu
    Hi folks, I need to send email programmatically in iphone os 2.0. some where i found NSString *url = [NSString stringWithString: @"mailto:[email protected][email protected]&subject=Greetings%20from%20Cupertino!&body=Wish%20you%20were%20here!"]; [[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]]; is this is code work on iphone os 2.0. similarly i need to send sms in iphone 2.0 and make a call. i found it is not possible in sending sms in iphone 2.0 and making call. is there any third party tools to send sms. can any one pls help me. Thank u in advance.

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  • Packaging a Bundle with a static library

    - by 4thSpace
    I have a static library that includes some xibs. These will basically be the same across projects. I'd like to include the xibs as part of the library. I can include their veiwcontrollers, reference these controllers in the calling project but then there isn't a xib to load. When I right click the xib in the library project, it can't be part of the target. I thought about creating a CFPluginBundle but that creates a new project. I'd loose all of my IBOutlet and IBAction references. What is the best way to reuse xibs that also have outlets and actions to specific controllers?

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