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• Dismissing the keyboard in a UIScrollView

  - by Nicholas1024

  Alright, I have a couple of UITextFields and UITextViews inside a UIScrollView, and I'd like to set the keyboard to disappear whenever the scrollview is touched or scrolled (except when you touch down inside the text field/view, of course). My current attempt at doing this is replacing the UIScrollView with a subclass, and setting it to call a removeKeyboard function (defined inside the main view controller) inside the touchesBegan method. However, this only removes the keyboard for a normal touch, not when the view is simply scrolled. So, what's the best way to remove the keyboard inside a UIScrollView? Thanks in advance for your help.

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• How to call a method from another class that's been instantiated within the current class

  - by Pavan

  my screen has a few views like such __________________ | _____ | | | | | //viewX is a video screen | | | | | viewX | vY | | //viewY is a custom uiview i created. | |____| | //it contains a method which i would like to call that toggles |_________________| //the hidden property of this view. and when it hides, a little | | //button is replaced no the top right corner on top of viewX | viewZ | //the video layer | | |_________________| //viewZ is a view containing many square views - thumbnails. my question is, i dont know how to register for touch events so that it recognises any touch event on no matter which view the user touches the screen.. atm im handling the touch events for each view inside it. so all works well... however what im trying to do is that when the user taps anywhere else on the screen but on viewY, viewY should dissapear by calling that method in the viewY class. this viewY class is instantiated and has no xib file attached to it. the uiview is created progammatically in the viewY class. this whole class for viewY behviour is instantiated in viewX - the video view. my boss says add delegates.. although i have now clue how to do that... any help? is there anyway i can just make it really simple and be able to say REMOVE VIEW no matter which class im calling from? Also ive seen other people achieve this by using these funky arrows - ... <- etc.. although im not sure if thats what i need or how to implement such a thing. ah i think ive made my question quite complicated but i really mean it to be a simple one, and know it can be done in an easy way!

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• Is there a difference between NSString compare: and isEqual(ToString): ?

  - by frenetisch applaudierend

  Occasionally I find code which tests if two NSStrings are the same like this: if ([str1 compare:str2] == NSOrderedSame) { // Do something } Now, I believe this is less readable than using isEqualToString: and it also has some nasty side effects, like if str1 == nil the if(..) evaluates to true, or when str2 == nil havoc might break upon us according to the Apple docs. But before I crusade against those statements in my companys code, I wanted to make sure I didn't miss some important point. So my question basically boils down to: Is there any difference between a compare: to NSOrderedSame and isEqual:?

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• Adding a footer to a table in another view?

  - by cannyboy

  The app I'm making has a settings view which I want to show on the first run of the app. Normally (after the first run) this view will be pushed onto the screen and there will be a "Back" button in the nav bar. However, on first launch I don't want there to be a back button. Instead, I want to add a 'Done' button at the footer of the table... and then the view can be popped. Here's my code (in my initial view's viewDidLoad). I have removed the back button, but don't know how to add the footer and button. NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; if ([prefs stringForKey:@"firstRun"] == nil) { SettingsViewController *settingsView = [[SettingsViewController alloc] initWithNibName:@"SettingsView" bundle:nil]; settingsView.hidesBottomBarWhenPushed = YES; settingsView.navigationItem.hidesBackButton = TRUE; // add footer button here? [[self navigationController] pushViewController:settingsView animated:YES]; [settingsView release]; [prefs setObject:@"OK" forKey:@"firstRun"]; } else { //something }

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• "incomplete universal character name" with stringWithUTF8String

  - by Nasser

  hi, when i try to convert form utf-8 string to NSString like so: NSString *s = [NSString stringWithUTF8String:"\U0627\U0644\U0641\U0631\U0646"]; NSLog(@"%@", s); i get the compile error: incomplete universal character name note that it sometime just works fine: NSString *UAE = [NSString stringWithUTF8String:"\U0627\U0644\U0641\U0631\U0646"]; NSLog(@"%@", UAE); and the output: ???????? so why is that happening? please help.

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• Basic iPhone app help

  - by LaSha

  I'm new to iphone development and have about 5 days of experience with xcode, so I need some help developing the following app. I'm not sure where to start. The app is very simple, it's like a simplified version of the address book that came with the iphone a screen shows a list of all items in a list view list can be filtered through search list can also be favorites or unfavorites selecting an item will take the user to another screen with more detailed information (a pic, location,) the data should be stored in an xml file. Can you guys point me to the right path? or know any code samples that does this? Been stuck on this for days now. Thanks!!!

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• novice needing help on shuffeling an array

  - by steffen Myklebust

  Please help a TOTAL beginner.! I found this post: http://stackoverflow.com/questions/56648/whats-the-best-way-to-shuffle-an-nsmutablearray And as i try to deploy this in my own code, I cant get it working... :-( Can anyone help me to resolve this code? To me it looks like the shuffle function is not called..? here is my code: // // shuffle2ViewController.h // shuffle2 #import @interface shuffle2ViewController : UIViewController { NSMutableArray *puzzles; int *randomSort; } - (void)shuffle; @end //============================= // shuffle2ViewController.m ´#import "shuffle2ViewController.h" @implementation shuffle2ViewController (void)viewDidLoad { [super viewDidLoad]; NSMutableArray *puzzles = [NSMutableArray arrayWithObjects:@"1",@"2",@"3", @"4",@"5",@"6",@"7",@"8",@"9", @"10",@"11",@"12", nil]; // Call the shuffle function [self shuffle]; // print to log int i; NSLog(@"NEW OLD"); NSLog(@"================="); for (i = 0; i < 12; ++i) NSLog(@" %2i %@", i + 1, [puzzles objectAtIndex:i]); } int randomSort(id obj1, id obj2, void *context ) { // returns random number -1 0 1 return (random()%3 - 1); } (void)shuffle { // call custom sort function [puzzles sortUsingFunction:randomSort context:nil]; } Giving this result: NEW OLD ================= 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12

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• quartz2d translating the origin

  - by qwertyp96

  My understanding of quartz2d is that the code CGContextTranslateCTM(context, x, y); translates the coordinate system. I have a quartz2d view with lots of shapes on it, and the user needs to be able to pan around and zoom it. However, when using the CGContextScaleCTM(context, scaleX, scaleY); code, everything scales around the origin, not the center of the viewpoint the user is viewing. My solution to this was to use the following code: CGContextRef context = UIGraphicsGetCurrentContext(); CGContextTranslateCTM(context, 512.0+offset.x, 384.0+offset.y); //(512, 384) is the center of the iPad screen CGContextScaleCTM(context, scale, scale); You can translate around fine, but things still scale into the corner. What's wrong? EDIT: Oh. Wow. Duh. If you move the origin, the shapes move too, so you can't move it relative to the shapes. Now I know what's wrong, but how do I do that?(move the origin independently of the shapes)

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• Request for member Name in something not a structure or Union

  - by Ashutosh

  Hey Folks, I am trying to Call the webservices in my app and while checking it in console it's showing the number of objects. (as i am using the Mutable array) and then while trying to display the name of the objects (here it's location) it's giving me an error in this line for (SDZArrayOfLocationWithLatestGrades* location in a) { NSLog(@" - %@", location.Name); // error here and a is the mutable array } PLease help me with this and Happy New Year to All!!!!!! Thanks,

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• Why doesn't NSDateFormatter return a NSString?

  - by TheLearner

  Why does this message not return a string: NSDate *today = [NSDate date]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; NSString *formattedDate = (@"Date for today %@:", [dateFormatter stringFromDate:today]);

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• Dynamic Button Layout without hard coding positions

  - by mmc

  I would like to implement a view (it will actually be going into the footer of a UITableView) that implements 1-3 buttons. I would like the layout of these buttons (and the size of the buttons themselves) to change depending on which ones are showing. An example of almost the exact behavior I would want is at the bottom of the Info screen in the Contacts application when you are looking at a specific contact ("Add to Favorites" disappears when it is clicked, and the other buttons expand to take up the available space in a nice animation). As I'm running through the different layout scenarios, I'm hard coding all these values and I just think... "this is NOT the way I'm supposed to be doing this." It even APPEARS that Interface Builder has some features that may do this for me in the ruler tab, but I'll be darned if I can figure out how they work (if they work) on the phone. Does anyone have any suggestions, or a tutorial online that I could look at to point me in the right direction? Thanks much.

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• Sharing same properties of ViewController for iPhone Stroryboard and iPad Story Board

  - by Ruhul Amin

  I'm developing a universal application. in the first view, I have the login screen for the user. In iPhone storyBoard, I have added 2 text field and one button( login check). I have added properties in ViewController.h file by dragging those objects(Ctrl key + Dragg) to .h file. I have added code for login check and it is working fine for iPhone. This is the code in ViewController.h @property (strong, nonatomic) IBOutlet UITextField *txtUserId; @property (strong, nonatomic) IBOutlet UITextField *txtUserPwd; @property (strong, nonatomic) IBOutlet UIButton *btnLogin; In the iPad storyBoard, I have added 2 text field( userid and password) and i button for login. So now, I want to bind those objects with the veriable which I declared already in ViewController.h file in case of iPhone. My questions: 1. What is the right way to bind properties for both storyboard? 2. Am I on the right direction or should I think in a different way to do it? I am new with iPhone development. Please help. Thanks. --Amin

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• can any one provide me some link or ebooks related to the server side programing on iphone using the

  - by uttam

  i want to learn the server side programing with json parser on the client side and php on the server side. i want some ebook or link related to the same.

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• UIViewController takes up entire screen in Interface Builder

  - by Sheehan Alam

  I have a NIB with a UIView that contains some UILabels, UIButtons etc. and a UIViewController that is loading a detached NIB. I want the UIViewController to be positioned below my UIView, but whenever I add it in Interface Builder it takes up the whole screen, and my UIView becomes part of the UIViewController. How can I make sure UIViewController appears below the UIView?

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• Custom nib UITableViewCell height

  - by Chuck

  I've created a custom UITableViewCell in IB, linked it to the root view controller's property for it, and set it up in CellForRowAtIndexPath. But the height of my drawn cells doesn't match what I setup in IB, advice? Here's some screenshots and the code. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *AddressCellIdentifier = @"AddressCellIdent"; UITableViewCell *thisCell = [tableView dequeueReusableCellWithIdentifier:AddressCellIdentifier]; if (thisCell == nil) { [[NSBundle mainBundle] loadNibNamed:@"AddressCell" owner:self options:nil]; thisCell = addressCell; self.addressCell = nil; } return thisCell ; } addressCell is a @property (nonatomic, assign) IBOutlet UITableViewCell *addressCell;, and is linked up in IB to the file's owner (the table view controller). I'm using the example from Apple's table view programming guide.

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• Adding an Image to the calendar View in Iphone

  - by sadumerry

  I need to add an image at the top of the default calendar view of the iPhone. If any body knows how to implement this please respond.I am using the Tapku library inorder to show the calendar. Kal library also can be used if this can implement there. Below attached the calendar view and i need to put an image at the top of this calendar just below the title bar.The calendar need to see just below the image.

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• iPhone adding a timer to an app

  - by Rob J

  How would I go about adding a simple 2 minute timer to my app in almost the exact same way that the clock app does? I just want the user to click start and have the timer start displaying the timer counting down from 2:00 and beep when it hits 0:00.

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• when setting a property does the property name always change to camelcase?

  - by TheLearner

  So if a have this property: @property (nonatomic, retain) MKReverseGeocoder *reverseGeocoder; and i want to set it, does the case always change: [self setReverseGeocoder: ... Seems a bit weird to get used to! I mean the property name is lower case!

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• Microphone question in iPhone SDK

  - by Henry D'Andrea

  I am trying to do an app, to where when it launches, it will detect audio, and then play it back automatically. NO BUTTONS, NOthing to press. Just a picture of something then, it listens for audio, then plays it back. Similar to the Talking Carl app in the App Store. Any ideas/help? Would appreciate it, if i could use the code with IB.

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• Does NSClassFromString affect performance?

  - by Tomen

  I want to create a controller that depends on the class of a given instance of a model -(BaseController *)getControllerForModel:(Model *)model { BaseController *controller = nil; Class controllerClass = [BaseController class]; //the default value //find the right controller if ([model isMemberOfClass:[ModelClass1 class]]) controllerClass = [ConcreteController1 class]; else if ([model isMemberOfClass:[ModelClass2 class]]) controllerClass = [ConcreteController2 class]; else if ([model isMemberOfClass:[ModelClass3 class]]) controllerClass = [ConcreteController3 class]; ... else if ([model isMemberOfClass:[ModelClassX class]]) controllerClass = [ConcreteControllerX class]; else Trace(TRACELEVEL_WARNING, @"Unrecognized model type: %@", NSStringFromClass([model class])); //Now instantiate it with the model controller = [[[controllerClass alloc] initWithModel:model] autorelease]; return slotController; } I want to find a more flexible solution to this and thought of having a dictionary, which maps Model-Classes to Controller-Classes and then NSClassFromString could give me the right instance. My question is this: Is NSClassFromString using much of my applications performance if i use it several times (say, 100 times at once)? Or would it be about as fast as the above approach?

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• iphone memory management: alloc and retain properties.

  - by Jonathan

  According to the docs, you do one release per alloc or retain (etc) However what about when using retain propertys? eg: HEADER @property(retain)UIView *someView; IMPLEMENTATION /*in some method*/ UIView *tempView = [[UIView alloc] init]; //<<<<<ALLOC - retain count = +1 [tempView setBackgroundColor:[UIColor redColor]]; self.someView = tempView; ///<<<<<RETAIN - retain count = +2 [tempView release]; ///should I do this? or a different version of the IMPLEMENTATION self.someView = [[UIView alloc] init]; //<<<<<ALLOC & RETAIN - retain count = +2 //now what??? [self.someView release]; ???? EDIT: I didn't make it clear, but I meant what to do in both circumstances, not just the first.

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• Parameter becoming zero somewhere

  - by Nick

  Hey guys, Something really weird is happening: when I call foo(100*1.0f), somewhere along the line that becomes 0. To verify I put a breakpoint on foo(), and it indeed is zero and it indeed gets called with 100*1.0f. The code is in Obj-C++. Here is the calling function in XCode's GDB frontend, as you can see, score*scoreMultiplier is 100. And here is the called function in XCode's GDB frontend, here _score is 0.

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• TabBarController delegate is not working

  - by Zach

  Hi, Can any one help me, when i am using my UITabBarController delegate it is not working.. I called a delegate method like this.. - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { [self.navigationController popToRootViewControllerAnimated:NO]; }

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• How can I add a header folder to my project?

  - by VansFannel

  I'm developing an iOS application with latest Xcode 4.5.2. I have the following folder structure: /.../SourceCode/MyProjectFolder/projectName.xcodeproject /.../SourceCode/MyProjectFolder/projectName/ /.../SourceCode/MyProjectFolder/projectName/xxx.m /.../SourceCode/MyProjectFolder/projectName/xxx.h /.../SourceCode/MyProjectFolder/projectName/PVRT/ /.../SourceCode/MyProjectFolder/projectName/PVRT/header1.h /.../SourceCode/MyProjectFolder/projectName/PVRT/OtherFolder/header2.h If in my header files I add this: #include "header1.h" I get a "header1.h" not found error. But, if I add: #include "PVRT/header1.h" I get a "header2.h" not found. On project settings I have add the following path: ${SOURCE_ROOT}/projectName/PVRT But I'm getting the same error. How can I fix this?

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• Red Badge on UITab?

  - by Mohit Deshpande

  I have noticed that some applications (BeejiveIM) that you can put the red badge on a UITab. What message must be passed to add a badge to a tab?

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