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  • Quartz 2D Layers

    - by coure06
    I want to create 2 separate layers using quartz 2D. Can i handle there redraw methods separately? so that i can redraw 1 layer without redrawing the whole screen or other layers. Is it possible? any code sample?

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  • NSScanner scanFloat returning unexpected results

    - by E-Madd
    I'm trying to build a UIColor from a comma-delimited list of values for RGB, which is "0.45,0.53,0.65", represented here by the colorConfig object... NSScanner *scanner = [NSScanner scannerWithString:colorConfig]; [scanner setCharactersToBeSkipped:[NSCharacterSet characterSetWithCharactersInString:@"\n, "]]; float red, green, blue; return [UIColor colorWithRed:[scanner scanFloat:&red] green:[scanner scanFloat:&green] blue:[scanner scanFloat:&blue] alpha:1]; But my color is always coming back as black. So I logged the values to my console and I'm seeing Red = -1.988804, Green = -1.988800, Blue = -1.988796 What am I doing wrong?

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  • White disclosure indicator

    - by Knodel
    In my app I have a UITableView with a UITableViewCellAccessoryDisclosureIndicator. I don't want to change the whole indicator, but I want to make it white instead of gray. How can I do it? Thanks in advance!

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  • Clearing "may not respond" warnings for UIView and UIViewController

    - by user284681
    In an iPad app, I'm using a custom subclass of UIView with UIViewController. Here's the view header: @interface pdfView : UIView { CGPDFDocumentRef doc; } -(void)setDoc:(CGPDFDocumentRef)newDoc; @end And here's the controller header: @interface iPadPDFTestViewController : UIViewController { CGPDFDocumentRef doc; } - (void)loadPDF; @end Part of the controller implementation: - (void)viewDidLoad { [super viewDidLoad]; [self loadPDF]; [self.view setDoc:doc]; } In Interface Builder, I've set the view object to use the class pdfView. At compilation, [self.view setDoc:doc]; gives the warning "'UIView' may not respond to '--setDoc'." I'm guessing that this warning appears because the compiler thinks it's looking at UIView (which does not implement the setDoc method) instead of pdfView. But why does it think that? And how can I tell it what class it's really looking at, so as to clear the warning?

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  • UIIMageView, warning: check_safe_call: could not restore current frame

    - by lukya
    Hi, I am changing the image in UIImageView based on accelerometer input. The images are stored in an array. The application runs fine for a while and then crashes. warning: check_safe_call: could not restore current frame I am not using "UIImage ImageNamed" method when populating the array. The total size of all images is around 12 Mb. But individual images are very light (<100 kb) and i am using only one image at a time from the array. Just in case there are any autoreleases, I have allocated a NSAutoreleasePool in view did load and am draining it in the didReceiveMemoryWarning method (which does get called 2, 3 times before the app crashes?). Following is the code that creates images array: //create autorelease pool as we are creating many autoreleased objects NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSMutableArray *finalarr = [[NSMutableArray alloc] initWithCapacity:9]; NSLog(@"start loading"); for(int y = 0; y < 100; y+=10) { NSMutableArray *arr = [[NSMutableArray alloc] initWithCapacity:10]; for(int x = 0; x < 10; x++) { NSString *imageName = [[NSString alloc] initWithFormat:@"0%d",y + x]; UIImage *img = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:imageName ofType:@"png"]]; [arr addObject:img]; [imageName release]; [img release]; } [finalarr addObject:arr]; [arr release]; } NSLog(@"done loading"); // Override point for customization after app launch viewController.imagesArray = finalarr; [finalarr release]; //retain the array of images [viewController.imagesArray retain]; //release the aurtorelease pool to free memory taken up by objects enqued for release [pool release]; As the app runs smoothly for a while, which means array creation is definitely not the problem. After this the following method is called from [accelerometer didAccelerate] -(BOOL)setImageForX:(int)x andY:(int)y { [self.imageView setImage:(UIImage*)[(NSArray*)[self.imagesArray objectAtIndex:y] objectAtIndex:x]]; return TRUE; } So the only code being executed is the "UIImageView setImage". But no objects are being created here. Please let me know if the code seems to have any leaks or i am doing something wrong. Thanks, Swapnil

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  • Can't set default value of string property to "" in the Xcode CoreData model designer

    - by glenc
    I have an entity in my datamodel with a string property that is currently optional, and I'd like to convert this property to a required property with a default value of the empty string. As others have discovered, leaving the default value blank results in validation errors (since the designer interprets this as NULL), but trying '', "", or @"" as the default value results in those literal characters being interpreted as the default, rather than the empty zero-length string, as desired. I did find this thread on Google, however, apart from the solution being really ugly (model definition split between the .xcdatamodel and objc source), it also doesn't work for lightweight migrations because those migrations are done solely based on the .xcdatamodel files and the objc logic from your entity implementations isn't loaded. Is there any way to achieve this in the data model designer?

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  • UITableViewCells of different heights place their accessoryViews at different X positions

    - by Jasarien
    Hey Guys, My app has some table cells that vary in height. The cells can also have a UIButton set to be a detail disclosure button (round, blue with arrow) as their accessory view. Depending on the height of the cell, the accessory view is positioned differently. At first I thought it was my layout code for my cell that was causing the problem, so I set up a quick independent test that uses vanilla UITableCells to remove the possibility that it could be my fault. I set up a view in interface builder, and just added a view table cells to the view, set their heights to different values and then added a detail disclosure button to each. Nothing more, nothing less. This is what I see: I added the size guides (thanks to Xscope) so you can see the difference in the accessory view x positions. The heights are: top 37px mid 68px bottom 44px (default, untouched height) If I increase the height any heigher than 68px the accessory view doesn't move any further to the left. Is this a bug? Is there any way I can prevent this from happening?

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  • Loading a UITableView From A Nib

    - by Garry
    Hi, I keep getting a crash when loading a UITableView. I am trying to use a cell defined in a nib file. I have an IBOutlet defined in the view controller header file: UITableViewCell *jobCell; @property (nonatomic, assign) IBOutlet UITableViewCell *jobCell; This is synthesised in the implementation file. I have a UITableViewCell created in IB and set it's identifier to JobCell. Here is the cellForRowAtIndexPath method: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *cellIdentifier = @"JobCell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier]; if (cell == nil) { [[NSBundle mainBundle] loadNibNamed:@"JobsRootViewController" owner:self options:nil]; cell = jobCell; self.jobCell = nil; } // Get this job Job *job = [fetchedResultsController objectAtIndexPath:indexPath]; // Job title UILabel *jobTitle; jobTitle = (UILabel *)[cell viewWithTag:tagJobTitle]; jobTitle.text = job.title; // Job due date UILabel *dueDate; dueDate = (UILabel *)[cell viewWithTag:tagJobDueDate]; dueDate.text = [self.dateFormatter stringFromDate:job.dueDate]; // Notes icon UIImageView *notesImageView; notesImageView = (UIImageView *)[cell viewWithTag:tagNotesImageView]; if ([job.notes length] > 0) { // This job has a note attached to it - show the notes icon notesImageView.hidden = NO; } else { // Hide the notes icon notesImageView.hidden = YES; } // Job completed button // Return the cell return cell; } When I run the app - I get a hard crash and the console reports the following: objc[1291]: FREED(id): message style sent to freed object=0x4046400 I have hooked up all the outlets in IB correctly. What is the issue? Thanks,

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  • Wanted: How to reliably, consistently select an MKMapView annotation

    - by jdandrea
    After calling MKMapView's setCenterCoordinate:animated: method (without animation), I'd like to call selectAnnotation:animated: (with animation) so that the annotation pops out from the newly-centered pushpin. For now, I simply watch for mapViewDidFinishLoadingMap: and then select the annotation. However, this is problematic. For instance, this method isn't called when there's no need to load additional map data. In those cases, my annotation isn't selected. :( Very well. I could call this immediately after setting the center coordinate instead. Ahh, but in that case it's possible that there is map data to load (but it hasn't finished loading yet). I'd risk calling it too soon, with the animation becoming spotty at best. Thus, if I understand correctly, it's not a matter of knowing if my coordinate is visible, since it's possible to stray almost a screenful of distance and have to load new map data. Rather, it's a matter of knowing if new map data needs to be loaded, and then acting accordingly. Any ideas on how to accomplish this, or how to otherwise (reliably) select an annotation after re-centering the map view on the coordinate where that annotation lives? Clues appreciated - thanks!

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  • Using a UIPickerView to make a CoreData Relationship

    - by DVG
    Okay, so I have a fairly simple application set up. I have two different CoreData Entities, Games and Platforms, each have one attribute: name, and they have a one-to-many relationship between them. Platforms are populated on the first launch of the application, and will never change as a result of user input. I'm working on my Add view to let the user add new games to their personal database, and each game should select from a platform. The add view itself is a grouped table view with static custom cells. Tapping the platform cell should advance the user to another view to select the platform. My thought is that UIPickerView seems like a logical choice for the control, since the Platform list is static, but I'm not sure how to use it with CoreData. Even if I construct a fetch request to get the Platform objects and extract the strings out, how do I go about linking the new Game object to the original Platform object?

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  • UINavigationController Back Button not visible, but works

    - by cagreen
    I have a scenario where my UINavigationController is missing the back button (left button) but tapping the left button still seems to work. I found a similar problem posted here: http://stackoverflow.com/questions/919832/uinavigationcontrollers-back-button-disappears which was resolved by not setting the title to @"", but that's not my problem. Are there any other scenarios that would cause this behaviour? Thanks.

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  • how to select different parts of an image

    - by abhinav
    there is a .png image displaying human body skeleton.My query is that how to select diffrent parts of the skeleton like hand,foot,head etc in the image and then after selection control moves into another view which displays information about that selected part.

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  • Core Data and NSDate

    - by Pierre
    Hi ! I read this post but I don't really understand the code... I have a core data database with an Entity and some attributes. One of them is named "myDate" and has for type NSDate. Now I want to to display each date but eliminate dates with same day-month-year and display them ascendantly . Have you got an idea? Thanks a lot !

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  • How can I set a highlighted image on a table view cell?

    - by nevan
    I've followed the code in Apple's AdvancedTableViewCells and built a table view with a background image for cells. Now I want to change it so that instead of the blue highlight colour, it shows a darker version of my image. What are the steps I need to follow to do this? I'm using a UITableViewCell subclass with a custom NIB. My background image is implemented as the cell.backgroundView. The steps I've take so far are: Change the selectionStyle of the cell to "None" Set the Highlight colour on my UILabel subviews to a light colour Create a darker version of my background as a separate image Override setSelected: animated: I'm wondering about the next steps.

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  • Unable to forward UITouch events to my view controller

    - by hyn
    I have a UISplitViewController setup with a custom view added as a subview of the view (UILayoutContainerView) of split view controller. I am trying to forward touch events from my custom view controller to the master and detail views, but the following (which was suggested here on another thread) seems to have no effect: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; // Do something [self.nextResponder touchesBegan:touches withEvent:event]; } (I couldn't get this formatted properly) As a result my custom view controller locks the events and all the UI underneath never has a chance to do anything. How can I get my master and detail view controllers to receive events?

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  • change fillColor of selected CAShapeLayer

    - by Frank
    I'm trying to change the fillColor of a CAShapeLayer when the layer it's contained in is touched. I'm able to change the background color of the tapped layer like this: -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { CALayer *layer = [(CALayer *)self.view.layer.presentationLayer hitTest:point]; layer = layer.modelLayer; layer.backgroundColor = [UIColor blueColor].CGColor; } This turns the background of "layer" blue as expected. My problem is how do I change the color of the CAShapelayer inside "layer"? Thanks!

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  • objective-c : @synchronized how it works ?

    - by g.revolution
    Hi, i have two methods -(void) a { @synchronized(self) { // critical section 1 } } -(void) b { @synchronized(self) { // critical section 2 } } now my question is if a thread is in critical section 1. will the critical section 2 be locked for other threads or other threads can access critical section 2.

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  • How to set that compiler flag?

    - by mystify
    Shark told me this: This instruction is the start of a loop that is not aligned to a 16-byte address boundary. For optimal performance, you should align the start of a hot loop using a compiler directive. With gcc 3.3 or later, use the -falign-loops=16 compiler flag. for (int i=0; i < 4; i++) { // line with the info //...code } How would I set that flag, and does it really improve performance?

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  • Adding a UIPickerView over a UITabBarController

    - by Kai
    I'm trying to have a UIPickerView slide from the bottom of the screen (over the top of a tab bar) but can't seem to get it to show up. The actual code for the animation is coming from one of Apple's example code projects (DateCell). I'm calling this code from the first view controller (FirstViewController.m) under the tab bar controller. - (IBAction)showModePicker:(id)sender { if (self.modePicker.superview == nil) { [self.view.window addSubview:self.modePicker]; // size up the picker view to our screen and compute the start/end frame origin for our slide up animation // // compute the start frame CGRect screenRect = [[UIScreen mainScreen] applicationFrame]; CGSize pickerSize = [self.modePicker sizeThatFits:CGSizeZero]; CGRect startRect = CGRectMake(0.0, screenRect.origin.y + screenRect.size.height, pickerSize.width, pickerSize.height); self.modePicker.frame = startRect; // compute the end frame CGRect pickerRect = CGRectMake(0.0, screenRect.origin.y + screenRect.size.height - pickerSize.height, pickerSize.width, pickerSize.height); // start the slide up animation [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.3]; // we need to perform some post operations after the animation is complete [UIView setAnimationDelegate:self]; self.modePicker.frame = pickerRect; // shrink the vertical size to make room for the picker CGRect newFrame = self.view.frame; newFrame.size.height -= self.modePicker.frame.size.height; self.view.frame = newFrame; [UIView commitAnimations]; // add the "Done" button to the nav bar self.navigationItem.rightBarButtonItem = self.doneButton; }} Whenever this action fires via a UIBarButtonItem that lives in a UINavigationBar (which is all under the FirstViewController) nothing happens. Can anyone please offer some advice?

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  • How to write text(using CGContextShowTextAtPoint) on graph x and y-axis intervals points?

    - by Rajendra Bhole
    I developed graph using NSObject class and using CGContext method. The following code displaying dynamically in X and Y-axis intervals, CGContextSetRGBStrokeColor(ctx, 2.0, 2.0, 2.0, 1.0); CGContextSetLineWidth(ctx, 2.0); CGContextMoveToPoint(ctx, 30.0, 200.0); CGContextAddLineToPoint(ctx, 30.0, 440.0); for(float y = 400.0; y >= 200.0; y-=30) { CGContextSetRGBStrokeColor(ctx, 2.0, 2.0, 2.0, 1.0); CGContextMoveToPoint(ctx, 28, y); CGContextAddLineToPoint(ctx, 32, y); CGContextStrokePath(ctx); //CGContextClosePath(ctx); } CGContextMoveToPoint(ctx, 10, 420.0); CGContextAddLineToPoint(ctx, 320, 420.0); //CGContextAddLineToPoint(ctx, 320.0, 420.0); //CGContextStrokePath(ctx); for(float x = 60.0; x <= 260.0; x+=30) { CGContextSetRGBStrokeColor(ctx, 2.0, 2.0, 2.0, 1.0); CGContextMoveToPoint(ctx, x, 418.0); CGContextAddLineToPoint(ctx, x, 422.0); CGContextStrokePath(ctx); CGContextClosePath(ctx); } I want to write the dynamic text on the X and Y-axis lines near the intervals (like X-axis is denoting number of days per week and Y-axis denoting something per someting)? Thanks.

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  • iTunes App Store API?

    - by Daniel
    Sites like http://www.apptism.com/ readout the app store automatically and display information like title, description, price and images. Where do I find the documentation for this (iTunes API?). I tried to google it but no good result.

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