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• NSDecimalNumber leaks memory if not used with AutoRelease pool?

  - by bioffe

  NSString* str = [[NSString alloc] initWithString:@"0.05"]; NSDecimalNumber* num = [[NSDecimalNumber alloc] initWithString:str]; NSLog(@" %@", num); [str release]; [num release]; leaks memory *** __NSAutoreleaseNoPool(): Object 0x707990 of class NSCFString autoreleased with no pool in place - just leaking Can someone suggest a workaround ?

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• How to draw multiple arcs in openGL

  - by chaitanya

  I had a mutable array of size 15. The array has different radius values. I need to divide the circle into 15(array size) divisions And draw each arc with the radius from mutable array.

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• RTL shows numbers at the end of lines

  - by Tiger

  Hi. Trying to display a hebrew string that starts with a number, always displays the number at the end of the string like so: 1. ??? ???? ????? but I need the number to be displayed at the right side of the text- any solution to that? It happens with UILabel & UITextField & UITextView and trying to write the number at the left side also produce the same resault. Playing with combinations of UITextAlignment will doesn't help.

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• how to disable the delete operation for certain row in UITableView

  - by user262325

  Hello everyone I know using 'setEditing' to enable the edit(delete) of UITableView But I prefer to disable the operation for some certain rows(enable other rows). Is it possible? Thanks interdev

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• What are the relevant classes / frameworks when I want to write / read stuff to / from disk?

  - by mystify

  Which classes / frameworks must I look at? I don't want to use 3rd party libs, so just plain old, boring default solutions to read / write text files and stuff like that... Is there something like a File IO framework?

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• Using .align in inline assemby

  - by tech74

  Hi, I'm using ".align 16 \n\t" in some inline ARM assembly that is implementing some loops to align it on a 16 byte boundary however gcc asm compiler is complaining that alignement is too large i want to implement -falign-loops=16 in asm for a particular loop Thanks

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• Methods in Customized View did not get invoke in AppDelegate, Why?

  - by NorthKyut

  I want the methods pauseGame in customized UIView - MyGameView get invoked when the phone is locked or interrupted. So I have a pauseGame method but it can't stop the timer when user lock screen (command+L). The lock screen did appear but the game still running at the background. So I added the testPause method to MyGameView and MyGameAppDelegate and and put a breakpoint to debug it. When screen locked it, the screen lock appeared and the code did stop at the breakpoint. But when I tried to step into the testPause method, it didn't take me to the method in MyGameView (it just passed it, not skipped) and no message was printed on terminal by NSLog. Why? What did I miss? // // MyGameAppDelegate.h // MyGame // #import <UIKit/UIKit.h> @class MyGameViewController; @class MyGameView; @interface MyGameAppDelegate : NSObject { UIWindow *window; MyGameViewController *viewController; MyGameView *view; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet MyGameViewController *viewController; @property (nonatomic, retain) IBOutlet MyGameView *view; @end // // MyGameAppDelegate.m // MyGame // #import "MyGameAppDelegate.h" #import "MyGameViewController.h" #import "MyGameView.h" @implementation MyGameAppDelegate @synthesize window; @synthesize viewController; @synthesize view; - (void)applicationWillResignActive:(UIApplication *)application { /* Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game. */ [view pauseGame]; [view testPause]; } @end // // MyGameView.h // MyGame @interface MyGameView : UIView { - (void)pauseGame; - (void)testPause; @end // // MyGameView.m // MyGame // #import "MyGameView.h" #import "AtlasSprite.h" #import "MyGameViewController.h" #import "SecondViewController.h" @implementation MyGameView - (void)pauseGame { [theTimer invalidate]; theTimer = nil; } - (void)testPause{ NSLog(@"TestPause"); } @end

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• swipe to delete uitableview cell; a bit jumpy?

  - by Veeru

  I have implemented "swipe to delete" on my table cell. It works fine, how ever, the delete button is a little jumpy; as in, i really have to position my finger on top of the button and carefully touch it to delete the record. I am not sure if am making it clear; let me do my best to explain When the delete button appears; the user has trouble clicking on it, it disappears the moment its clicked. THe user has to try a few times to actually delete the cell. Am not sure what the reason is, it just seems like the delete button gets hidden as though the user has clicked on a different part of the cell. Any suggestsions?

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• Can Settings bundle use values from application's Info.plist file?

  - by delirus

  Hi, is it possible to use values from application's Info.plist file as DefaultValue value for items in Settings.bundle? For example CFBundleVersion. I've tried entering it as ${CFBundleVersion} but it didn't work. I've also tried changing DefaultValue type but with no success. Any ideas? The reasons behind are simple: CFBundleVersion is known at compile time, so I won't have to take its value from application's mainBundle and then apply that value to NSUserDefaults. Other reason is that just after installing the app, but before running it, Settings bundle values are not in-sync as the code setting NSUserDefaults did not have a chance to execute itself... so it would be boring to always remember that I have to change my Settings bundle values manually.

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• How to calculate the y-pixels of someones weight on a graph? (math+programming question)

  - by RexOnRoids

  I'm not that smart like some of you geniuses. I need some help from a math whiz. My app draws a graph of the users weight over time. I need a surefire way to always get the right pixel position to draw the weight point at for a given weight. For example, say I want to plot the weight 80.0(kg) on the graph when the range of weights is 80.0 to 40.0kg. I want to be able to plug in the weight (given I know the highest and lowest weights in the range also) and get the pixel result 400(y) (for the top of the graph). The graph is 300 pixels high (starts at 100 and ends at 400). The highest weight 80kg would be plot at 400 while the lowest weight 40kg would be plot at 100. And the intermediate weights should be plotted appropriately. I tried this but it does not work: -(float)weightToPixel:(float)theWeight { float graphMaxY = 400; //The TOP of the graph float graphMinY = 100; //The BOTTOM of the graph float yOffset = 100; //Graph itself is offset 100 pixels in the Y direction float coordDiff = graphMaxY-graphMinY; //The size in pixels of the graph float weightDiff = self.highestWeight-self.lowestWeight; //The weight gap float pixelIncrement = coordDiff/weightDiff; float weightY = (theWeight*pixelIncrement)-(coordDiff-yOffset); //The return value return weightYpixel; }

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• Drawing animation

  - by HHHH

  I'm creating a simple app where when the user presses a button, a series of lines will be drawn on the screen and the user will be able to see these lines drawn in real time (almost like an animation). My code looks something like this (has been simplified): UIGraphicsBeginImageContext(CGSizeMake(300,300)); CGContextRef context = UIGraphicsGetCurrentContext(); for (int i = 0; i < 100; i++ ) { CGContextMoveToPoint(context, i, i); CGContextAddLineToPoint(context, i+20, i+20); CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); CGContextStrokePath(context); } UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); My problem is that: 1) As soon as the user presses the button, the UIThread blocks until the drawing is done. 2) I can't get the lines to be drawn on the screen one at a time - I've tried setting the UIImage directly inside the loop and also tried setting a layer content inside the loop. How do I get around these problems?

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• Button not moving on my interface

  - by user1500134

  First before I say anything I want to announce that i'm fairly new to this kind of stuff so don't get all super techie on me :D ! Ok so i'm making an app and i'm trying to get a button to move to certain coordinates depending on the screen size of the phone (4, 4S, 5, etc...). I have correct syntax but the button will not move at all. Here is the part of my .m ViewController file... - (void)viewDidLoad { if([[UIScreen mainScreen] respondsToSelector:NSSelectorFromString(@"scale")]) { if ([[UIScreen mainScreen] scale] < 1.1) { CGRect frame = done.frame; frame.origin.x = 129; //New x coordinate frame.origin.y = 401; //New y coordinate done.frame = frame; NSLog(@"Standard Resolution"); } if ([[UIScreen mainScreen] scale] > 1.9) { NSLog(@"High Defenition Resolution"); } } [super viewDidLoad]; // Do any additional setup after loading the view from its nib. } The NSLog is triggering int he console saying 'Standard Resolution'but the button doesn't move from where I placed it in the XIB file. This may be a small stupid mistake but hopefully you can help me anyways... Thanks guys! :) P.S. Yes I did link my IBOutlet to the button

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• Question to delete [closed]

  - by Moitah

  Question to delete

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• How to remove seprator in tableView?

  - by AJPatel

  i make one tableview in which i add button type cell using custom cell.....looks good but when their is less cell in tableview at that time seprator looks very bad...... in design so thier is any solution than tell me............ i try to remove seprator from design but it not work.... Thanks in advance.......... - (void)viewDidLoad { self.navigationItem.title = @"My List"; self.tblView.separatorStyle = UITableViewCellSeparatorStyleNone; [[self tableView] setRowHeight:70]; [[self tableView] setBackgroundColor:[UIColor blackColor]]; Helath_ndroidAppDelegate *appDeleg = (Helath_ndroidAppDelegate *)[[UIApplication sharedApplication] delegate]; NSMutableArray *temp1 =[[NSMutableArray alloc] init]; appDeleg.recipCategoryFromDatabase = temp1; [temp1 release]; dataBase *objData = [[[dataBase alloc] init] autorelease]; [objData selectrecepFromDatabase]; [[self tableView] setSeparatorStyle:UITableViewCellSeparatorStyleSingleLineEtched]; [super viewDidLoad]; }

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• How can I discard 2 choices out of 4 from my Array of choice

  - by Umaid

  Actually I have four choice out of which i need to discard to choice on button click like 50/50 , then it will show only 2 choice for user to select out which one is correct and one is wrong -(IBAction)Rebind:(id)sender { if (i == [QuizArray count]) { if([sender tag] == 1) //if([sender tag] == 1) { [self.CorrectArr addObject:@"A"]; //[self.CorrectArr addObject:mydiet.varOpt1]; } else if([sender tag] == 2) { [self.CorrectArr addObject:@"B"]; //[self.CorrectArr addObject:mydiet.varOpt2]; } else if([sender tag] == 3) { [self.CorrectArr addObject:@"C"]; //[self.CorrectArr addObject:mydiet.varOpt3]; } else if([sender tag] == 4) { [self.CorrectArr addObject:@"D"]; //[self.CorrectArr addObject:mydiet.varOpt4]; } Score *myscore = [[Score alloc] initWithNibName:@"Score" bundle:nil]; myscore.SelectedArr = CorrectArr; [self.view addSubview:myscore.view]; } else { NSString *questionstring = [NSString stringWithFormat:[[QuizArray objectAtIndex:i] varQuestion]]; self.myquestion.text = questionstring; [btn1 setTitle:[[AnswerArray objectAtIndex:i] varAnswer] forState:normal]; if([sender tag] == 1) { [self.CorrectArr addObject:@"A"]; //addObject:mydiet.varOpt1]; } else if([sender tag] == 2) { [self.CorrectArr addObject:@"B"]; //addObject:mydiet.varOpt2]; } else if([sender tag] == 3) { [self.CorrectArr addObject:@"C"]; //addObject:mydiet.varOpt3]; } else if([sender tag] == 4) { [self.CorrectArr addObject:@"D"]; //addObject:mydiet.varOpt4]; } } i = i + 1; //} }

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• Objective-C retain clarification

  - by Maverick

  I'm looking at this code: NSMutableArray *controllers = [[NSMutableArray alloc] init]; for (unsigned i = 0; i < kNumberOfPages; i++) { [controllers addObject:[NSNull null]]; } self.viewControllers = controllers; [controllers release]; Later on... - (void)dealloc { [viewControllers release]; ... } I see that self.viewControllers and controllers now point to the same allocated memory (of type NSMutableArray *), but when I call [controllers release] isn't self.viewControllers released as well, or is setting self.viewControllers = controllers automatically retains that memory?

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• Adding a UILabel to a UIToolbar

  - by Boolean

  I'm trying to add a label to my toolbar. Button works great, however when I add the label object, it crashes. Any ideas? UIBarButtonItem *setDateRangeButton = [[UIBarButtonItem alloc] initWithTitle:@"Set date range" style:UIBarButtonItemStyleBordered target:self action:@selector(setDateRangeClicked:)]; UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 20, 20)]; label.text = @"test"; [toolbar setItems:[NSArray arrayWithObjects:setDateRangeButton,label, nil]]; // Add the toolbar as a subview to the navigation controller. [self.navigationController.view addSubview:toolbar]; // Reload the table view [self.tableView reloadData];

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• NSUserDefaults and show a picture

  - by Momeks

  Hi , iam using setting.bundle and i try to show a hidden picture with Switch toggle , here is my code but i miss something : NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [//Some code show the hidden pic]; myPic.hidden = NO; my key is .e.g = wood_back should i use ObjectForKey ?

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• How to display "number of items" in a tableview?

  - by Garry

  Hi, What's the best way to implement showing a number in a small circle on a UITableView row, much like is seen on the 'Inbox' row in the image below? Thanks,

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• Which are the most noteable things which make working with Core Date so different than with MySQL?

  - by mystify

  One thing I have in mind is, that datasets in Core Data (or lets say: managed objects) have no ID like known from other databases such as MySQL. Also, they're not in a specific guaranteed order. What else makes Core Data much more "special" compared to working with a relational database like MySQL? Besides the whole object graph persisting and ORM stuff?

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• Why is my view not resizing after rotating?

  - by E-Madd

  I'm only supporting the portrait orientation, but both the right-side-up and upside-down versions. Why do my subviews not resize appropriately? There's a status bar sized black space at the top of the view. If I change tabs and come back, it's corrected.

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• MKAnnotation - Map Pin callout pops up behind other map pins.

  - by user160462

  My map pins can be quite densely populated so that when a pin is selected the callout pops up but is mostly obscured by all the other map pins - I can bring the Map Pin to the front it there were a delegate for selected map pin ( not tapped callout, selected pin ). Any suggestions for a work around ?

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• Core Data: Detecting the type and casting it

  - by Tim Sullivan

  I have set up a Core Data model that includes an entity, Item with a 1-M relationship with the abstract entity Place, so that an item has many places. There are several entities with the parent set to Place. I want to set up several UI elements depending on the descendent place types. I have a loop that looks something like this: for (Place *place in item.places) { } ... but I'm not sure how to detect what type the place is, and how to cast it to the proper type so that I can access its properties. Thanks for any help!

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• Ordering a list of NSStrings in NSMutableArray?

  - by james.ingham

  Is it possible to order an NSMutableArray where it's values are NSStrings? I'm looking to order alphabetically. Thanks

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• Save Values AUTOMATICALLY with NSUserDefaults

  - by Edouard Tarter

  I have an app with two UITextFields, where the user enters an integer, and then a method is called with the values the user enters. But when I completely close the app, the values are deleted. I want to change it to save the value the user entered when it closes, and loads it up when the app is re-opened. I tried this with NSUserDefault, and it worked fine (with save and load button), but I want it to make it automatically, without pressing any buttons. I saw some other people do it with the basic methods in the AppDelegate.m, but I don't know anything about that, therefore I didn't understand it at all. I saw MANY tutorials online, but I didn't understand any of them, please help, and give a detailed answer, thanks :)

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