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  • TableView on Tab Bar Application ? Application is crashing.

    - by Andrei
    Steps to reproduce: 1. Create a Tab Bar Application called "TestApp" 2. Add new file, a UIViewController subclass with a XIB user interface called "Table" 3. Open up MainWindows.xib, click on the Second tab bar item and in Inspector change the NIB Name from "SecondView" to "Table". Save and close. 4. Open up Table.xib and drag a TableView on top of the view. Now link the dataSource and delegate outlets of the TableView to the Table.xib File's Owner. 5. Add the following code to Table.m: - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { NSLog(@"Returning num sections"); return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSLog(@"Returning num rows"); return 1; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"Trying to return cell"); static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } cell.text = @"Hello"; NSLog(@"Returning cell"); return cell; } 6.Run the application and select the Second tab bar item. If I start with a View-based application, add a TableView to it, link the outlets to the File's owner and add that piece of code it all works just fine. What am I doing wrong ? Why is the application crashing ?

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  • intialization with a nibFIle failed

    - by zp26
    Hi, I have a problem. I try to initialize a variabile in a classViewController created inside a xib file. I try with the code below but when i append a object to array, these array isn't initialized. Can you help me? thanks and sorry for my english. #import <UIKit/UIKit.h> @interface AccelerometroViewController : UIViewController <UIAccelerometerDelegate, UITextFieldDelegate, UIAlertViewDelegate>{ //..... NSMutableArray *arrayPosizioni; NSMutableArray *arrayPosizioniCorrenti; NSString *nomePosizioneCorrente; } -(IBAction)salvaPosizione; //... @property (nonatomic, assign) NSMutableArray *arrayPosizioni; @property (nonatomic, assign) NSMutableArray *arrayPosizioniCorrenti; @property (nonatomic, assign) NSString *nomePosizioneCorrente; @end #import "AccelerometroViewController.h" #import "Position.h" @implementation AccelerometroViewController float actualX; float actualY; float actualZ; @synthesize arrayPosition; @synthesize arrayCurrentPosition; @synthesize nameCurrentPosition; -(id)init { self = [super init]; if (self != nil) { arrayPosition = [[NSMutableArray alloc]init]; arrayCurrentPosition = [[NSMutableArray alloc]init]; nameCurrentPosition = [NSString stringWithFormat:@"noPosition"]; actualX = 0; actualY = 0; actualZ = 0; } return self; } -(void)updateTextView:(NSString*)nomePosizione { NSString *string = [NSString stringWithFormat:@"%@", nameCurrentPosition]; textEvent.text = [textEvent.text stringByAppendingString:@"\n"]; textEvent.text = [textEvent.text stringByAppendingString:string]; } -(IBAction)savePosition{ Posizione *newPosition; newPosition = [[Position alloc]init]; if([newPosition setValue:(NSString*)fieldNomePosizione.text:(float)actualX:(float)actualY:(float)actualZ]){ //setValue is a method of Position. I'm sure that this method is correct UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Salvataggio Posizione" message:@"Posizione salvata con successo" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil]; [alert show]; [alert release]; [arrayPosition addObject:newPosition]; } else{ UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Salvataggio osizione" message:@"Errore nel salvataggio" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil]; [alert show]; [alert release]; } } - (void) initialise { arrayPosition = [[NSMutableArray alloc] init]; arrayCurrentPosition = [[NSMutableArray alloc] init]; nameCurrentPosition = @"noPosition"; actualX = 0; actualY = 0; actualZ = 0; } - (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle { if (self = [super initWithNibName:nibName bundle:bundle]) { [self initialise]; } }

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  • [picker dismissModalViewControllerAnimated:YES]; not working

    - by shishir.bobby
    I am using - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { } for imagepicker and using [picker dismissModalViewControllerAnimated:YES]; in iPad to dismiss the picker. also i tried using - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;{ [picker dismissModalViewControllerAnimated:YES]; } to dismiss the picker once it done the work. BUt its not dimissing it. when i tap anywhere in the screen, than only it gets dismiss. What i am doing wrong to dismiss the imagepicker? Many thnkas

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  • How is Core Data detecting the conflicts, actually?

    - by brainfrog
    Apple says about -detectConflictsForObject: If on the next invocation of save: object has been modified in its persistent store, the save fails. This allows optimistic locking for unchanged objects. Conflict detection is always performed on changed or deleted objects. So what does this mean? If I simply modify an managed object and then save the context, there is always a conflict detection happening? Does this conflict detection simply compare the timestamps of the "records" to see if the "new" data is actually "old"? Is that a conflict?

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  • How to implement action in didSelectRowAtIndexPath of UITableview?

    - by Sumana Mehta
    On my view, I used to have few buttons and each button had an action associated with it. UIButton *testButton = [[UIButton alloc] initWithFrame:CGRectMake(120,300,90,90)]; [testButton setBackgroundImage:[UIImage imageNamed:@"test.jpg"] forState:UIControlStateNormal]; [testButton addTarget:self.view action:@selector(gotoProd:) forControlEvents:UIControlEventTouchUpInside]; [testButton addt [scrollView testButton]; But now I am trying to replace all those buttons with the tableview with rows. I was able to populate the rows and I know one needs to use didSelectRowAtIndexPath for handling on select event of the cell. But how can I implement action:@selector(gotoProd:) in tableviews ?? Any help will be greatly appreciated.

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  • Can't use method from class in other file

    - by user1833848
    I am not able to use one of my methods that i implemented in my tableviewcell file in my tableview controller implementation. I tried searching the web and xcode help with no luck. My codes looks like this: TableViewController.h: #import TableViewCell.h @interface TableViewController : UITableViewController @property (nonatomic, strong) IBOutlet UIBarButtonItem *A1Buy; @property (nonatomic, getter = isUserInteractionEnabled) BOOL userInteractionEnabled; - (IBAction)A1Buy:(UIBarButtonItem *)sender; TableViewController.m: @implementation A1ViewController @synthesize A1Buy = _A1Buy; @synthesize userInteractionEnabled; - (IBAction)A1Buy:(UIBarButtonItem *)sender { [TableViewCell Enable]; //this is where it gives an error } TableViewCell.h: @interface TableViewCell : UITableViewCell { BOOL Enable; BOOL Disable; } @property (nonatomic, getter = isUserInteractionEnabled) BOOL userInteractionEnabled; TableViewCell.m: @implementation TableViewCell; @synthesize userInteractionEnabled; - (BOOL) Enable { return userInteractionEnabled = YES; } - (BOOL) Disable { return userInteractionEnabled = NO; } As you can see i am trying to enable user interaction with a button, but Xcode only gives me errors like "class does not have this method" and stuff like that. All files are importet correctly so thats not why. Would appreciate any help. Thanks!

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  • Sorting an NSArray of NSString

    - by Robert Eisinger
    Can someone please show me the code for sorting an NSMutableArray? I have the following NSMutableArray: NSMutableArray *arr = [[NSMutableArray alloc] init]; with elements such as "2", "4", "5", "1", "9", etc which are all NSString. I'd like to sort the list in descending order so that the largest valued integer is highest in the list (index 0). I tried the following: [arr sortUsingSelector:@selector(compare:)]; but it did not seem to sort my values properly. Can someone show me code for properly doing what I am trying to accomplish? Thanks!

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  • UITableView populating EVERY OTHER launch

    - by Joshmattvander
    I am having a problem that I cant seem to get to the bottom of. In my view did load code, I am creating an array and attempting to populate the table. For some reason it only populates the data on EVERY OTHER time the app is run. I put logs in viewDidLoad which runs as does viewWillAppear and outputs the correct count for the array. Also, the UITableView specicic methods get called when it works and they just don't get called when it doesnt work. I cant figure out the root of this problem. Again this occurrence happens exactly 50% of the time. Theres no dynamic data that could be tripping up or anything. #import "InfoViewController.h" @implementation InfoViewController - (void)viewDidLoad { NSLog(@"Info View Loaded"); // This runs infoList = [[NSMutableArray alloc] init]; //Set The Data //Theres 8 similar lines [infoList addObject :[[NSMutableDictionary alloc] initWithObjectsAndKeys: @"Scrubbed", @"name", @"scrubbed", @"url", nil]]; NSLog(@"%d", [infoList count]); // This shows the count correctly every time [super viewDidLoad]; } -(void) viewWillAppear:(BOOL)animated { NSLog(@"Info Will Appear"); // This Runs } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // This WILL NOT RUN when it doesnt work, and DOES show the count when it does run NSLog(@"Counted in numberOfRowsInSection %d", [infoList count]); return [infoList count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"ROW"); static NSString *CellIdentifier = @"infoCell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; cell.textLabel.text = [[infoList objectAtIndex:indexPath.row] objectForKey:@"name"]; return cell; } @end

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  • need advise about NSClassFromString

    - by RAGOpoR
    according to this code i dont understand about NSClassFromString how did i know "viewControllerName" can i use it from another source ? could you please tell me more information how to use NSClassFromString? UIViewController *viewController = [[NSClassFromString(viewControllerName) alloc] init];

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  • modifying constants in objective c during run time

    - by moshikafya
    I am trying to solve the following problem. I have the following constants in my header file: #define PREFS_MY_CONSTANT_1 @"bla1" #define PREFS_MY_CONSTANT_2 @"bla2" #define PREFS_MY_CONSTANT_3 @"bla3" ... In one of my functions, I'd like to print to the UIbutton one of those strings based on user input, so say the user inputs '1', i would show bla1. Instead of creating a huge switch (i have 100 of those), I am looking for a way to combine the constant with the variable holding the user input, so something like that ideally: NSInteger input; [button setTitle:PREFS_MY_CONSTANT_{$input} forState: UIControlStateNormal]; Is something like that possible? what would be the best way to solve this?

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  • How to animate the change of image in an UIImageView?

    - by mystify
    I have an UIImageView with an image. Now I have a completely new image (graphic file), and want to display that in this UIImageView. If I just set myImageView.image = newImage; the new image is visible immediately. Not animatable. I want it to nicely fade into the new image. I thought maybe there's a better solution than just creating a new UIImageView on top of that and blending with animation?

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  • multiple regionDidChangeAnimated calls - what gives?

    - by mvexel
    I have a MKMapView inside a UITableView as a custom cell (don't ask ;) - don't know if it matters really), for which I register a regionDidChangeAnimated delegate method. This method gets called three times when the UITableView is loaded - once with the actual region and then two more times with a region that is way off. In the simulator, I consistently get a region with center (+37.43997405, -97.03125000). On the device, it seems to depend on the location reported by the location manager, which initializes the map view. Why am I getting three regionDidChangeAnimated calls? And why are the center coordinates for the last two of them off? This is the code I use to get the center coordinates: - (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated { CLLocation *l = [[CLLocation alloc] initWithLatitude:self.mapView.centerCoordinate.latitude longitude:self.mapView.centerCoordinate.longitude]; (....)

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  • Do we need to release an UIImage object even not allocated memory?

    - by Madan Mohan
    Hi Guys, I added an image to button UIImage* deleteImage = [UIImage imageNamed:@"Delete.png"]; CGRect imageFrame=CGRectMake(-4,-4, 310, 55); [btn setFrame:imageFrame]; btn.backgroundColor=[UIColor clearColor]; [btn setBackgroundImage:deleteImage forState:UIControlStateNormal]; [btn setTitle:@"Delete" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(editDeleteAction) forControlEvents:UIControlEventTouchUpInside]; [elementView addSubview:btn]; [deleteImage release];// do we need to release the image here If I release here its working fine but in object allocations no.of image count is increasing.

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  • Remove newline character while XML parsing

    - by Prashant
    Hi, I am facing a problem while XML parsing. I have an NSMutablestring currentElementValue that has newlines into it. It has been received as an XMl from a web source. Even when i am trying to remove newline charactersets of substring the first 3 char there is no effect on the string. What can be done here? Regards PC Code is (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { if(!currentElementValue) currentElementValue = [[NSMutableString alloc] initWithString:string]; else { [currentElementValue substringFromIndex:3]; [currentElementValue stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]]; NSLog(@"Processing Value : %@ with length %d", currentElementValue,[currentElementValue length] ); }

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  • Int property in class definition

    - by Daniel I-S
    I have the following class structure for custom UITableViewCells: NumericEntryCell - Contains method for controlling max value that can be entered into a textbox. SliderCell - inherits from NEC and contains methods for handling slider-control of textbox value TextOnlyCell - just contains a textbox CellA - inherits from SliderCell and has a max value of 28 CellB - inherits from TextOnlyCell and has a max value of 150. I want NumericEntryCell to contain a definition for a property that contains the maxValue. I want to be able to set a value for this in the initialize method of a child class (CellA or CellB). Currently I have an int maxValue declared in the interface of NEC. I declare a property for this with @property int maxValue and @synthesize it within the .m file. However, attempting to modify this property's value from CellA or CellB's initialize method has no effect - when I hit a breakpoint in the NEC method that uses this value, its value is always zero. How can I get this to work?

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