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  • How to draw an UIImageView in -drawRect:?

    - by mystify
    I'm trying since 5 hours now: - (void)drawRect:(CGRect)rect { // flip the wrong coordinate system CGContextTranslateCTM(context, 0.0f, rect.size.height); //shift the origin up CGContextScaleCTM(context, 1.0f, -1.0f); //flip the y-axis CGContextDrawImage(context, myImgView.frame, myImageView.image.CGImage); } The problem: While the image draws correctly, the coordinates specified by the UIImageView frame are completely useless. The image appears placed completely wrong on screen. I guess I must also flip the CGRect of the UIImageView? But how?

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  • How do you create a DropShadow on a UIView

    - by Arpit
    My current code doesnt seem to do anything: CGContextRef currentContext = UIGraphicsGetCurrentContext(); CGContextSaveGState(currentContext); float myColorValues[] = {1.0, 0, 0, .8}; CGColorSpaceRef myColorSpace = CGColorSpaceCreateDeviceRGB(); CGColorRef myColor = CGColorCreate(myColorSpace, myColorValues); CGContextSetShadowWithColor (currentContext, CGSizeMake(-1, -1), 0, myColor); //CGContextSetShadow(currentContext, CGSizeMake(-15, 20), 15); [super drawRect: rect]; CGContextRestoreGState(currentContext);

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  • little more help with a CATiledLayer

    - by Brodie4598
    Okay so I am trying to adapt an online tutorial for CATiledLayer to use in my app. The example uses a PDF but I need to display a JPG. I'm getting close, but I just cant figure this out. Should I be using a UIImage or something else? #import <QuartzCore/QuartzCore.h> #import "practiceViewController.h" @implementation practiceViewController - (void)viewDidLoad { [super viewDidLoad]; NSBundle *bundle = [[NSBundle mainBundle]autorelease]; NSString *path = [bundle pathForResource:@"H-5" ofType:@"jpg"]; NSData *data = [NSData dataWithContentsOfFile:path]; image = [UIImage imageWithData:data]; CGRect pageRect = CGRectMake(0, 0, 1600, 2400); CATiledLayer *tiledLayer = [CATiledLayer layer]; tiledLayer.delegate = self; tiledLayer.tileSize = CGSizeMake(1024.0, 1024.0); tiledLayer.levelsOfDetail = 1000; tiledLayer.levelsOfDetailBias = 1000; tiledLayer.frame = pageRect; myContentView = [[UIView alloc] initWithFrame:pageRect]; [myContentView.layer addSublayer:tiledLayer]; CGRect viewFrame = self.view.frame; viewFrame.origin = CGPointZero; UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:viewFrame]; scrollView.delegate = self; scrollView.contentSize = pageRect.size; scrollView.maximumZoomScale = 1000; [scrollView addSubview:myContentView]; [self.view addSubview:scrollView]; } - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return myContentView; } - (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx { NEED HE:LP WITH THIS } @end

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  • Deserializing a complex JSON result (array of dictionaries) with TouchJSON

    - by jpm
    I did a few tests with TouchJSON last night and it worked pretty well in general for simple cases. I'm using the following code to read some JSON content from a file, and deserialize it: NSString *jsonString = [[NSString alloc] initWithContentsOfFile:@"data.json"]; NSData *jsonData = [jsonString dataUsingEncoding:NSUTF32BigEndianStringEncoding]; NSError *error = nil; NSDictionary *items = [[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&error]; NSLog(@"total items: %d", [items count]); NSLog(@"error: %@", [error localizedDescription]); That works fine if I have a very simple JSON object in the file (i.e. a dictionary): {"id": "54354", "name": "boohoo"} This way I was able to get access to the array of values, as I wanted to get the item based on its index within the list: NSArray *items_list = [items allValues]; NSString *name = [items_list objectAtIndex:1]; (I understand that I could have fetched the name with the dictionary API) Now I would like to deserialize a semi-complex JSON string, which represents an array of dictionaries. An example of such a JSON string is below: [{"id": "123456", "name": "touchjson"}, {"id": "3456", "name": "bleh"}] When I try to run the same code above against this new content in the data.json file, I don't get any results back. My NSLog() call says "total items: 0", and no error is coming back in the NSError object. Any clues on what is going on? I'm completely lost on what to do, as there isn't much documentation available for TouchJSON, and much less usage examples.

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  • Parsing ISO-8859-1 w/ NSXmlParser

    - by Travis
    I am usin the nsxmlparser and am wondering how I can parse ISO-8859-1 correctly into an NSString. Currently, I am getting results w/ Â for two-byte characters. The XML I'm using (not created by me) starts with <?xml version="1.0" encoding="ISO-8859-1"?> Here are the basic calls I'm using (omitted the NSThread calls). NSString *xmlFilePath = [[NSBundle mainBundle] pathForResource:sampleFileName ofType:@"xml"]; NSString *xmlFileContents = [NSString stringWithContentsOfFile:xmlFilePath encoding:NSUTF8StringEncoding error:nil]; NSData *data = [xmlFileContents dataUsingEncoding:NSUTF8StringEncoding]; NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; [parser setDelegate:self]; [parser parse];

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  • JASON parsing using soap request and response

    - by hardik
    hello all in my project i want to use JASON parsing my sample soap request and response is here below please guide me how can i do that // soap request // <SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns9093="urn:outmarket"><SOAP-ENV:Body><ns9093:doStartup xmlns:ns9093="urn:outmarket"><username xsi:type="xsd:string">guest</username><password xsi:type="xsd:string">guest</password></ns9093:doStartup></SOAP-ENV:Body></SOAP-ENV:Envelope> // soap response // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:doStartupResponse xmlns:ns1="urn:outmarket"><return xsi:type="xsd:xml"><isvaliduser>1</isvaliduser><userid>19</userid><cansubmitphoto>0</cansubmitphoto><cansubmitcomment>0</cansubmitcomment><cansubmitrating>0</cansubmitrating><cansubmitmarket>0</cansubmitmarket><cansubmitstallholder>0</cansubmitstallholder><databaseid>1</databaseid><markets><markettype>1</markettype><marketid>3</marketid><marketname><![CDATA[Bairnsdale Farmers Market]]></marketname><ratingname><![CDATA[Market in general]]></ratingname><good>0</good><neutral>0</neutral><bad>0</bad></markets><markets><markettype>0</markettype><marketid>3</marketid><marketname><![CDATA[Bairnsdale Farmers Market]]></marketname><ratingname><![CDATA[Market in general]]></ratingname><good>25</good><neutral>0</neutral><bad>18</bad></markets><markets><markettype>0</markettype><marketid>5</marketid><marketname><![CDATA[Bendigo Farmers' Market]]></marketname><ratingname>`

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  • Copying the bitmap contents of a UIView's context to that of another UIView

    - by Joonas Trussmann
    Basically what I want to do is copy the already rendered content (a PDF drawn into the UIView's graphics context using CGContextDrawPDFPage()) onto a similar UIView, without having to re render the PDF. The idea is, that I'd then be able to perform an animated transform on the UIView and later re render the PDF with more accuracy. For both UIViews I'm using a larger-than-screen CATiledLayer to make it easier to rerender the PDF once the user zooms in, if that makes any difference. Any tips? I'm kind of lost here.

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  • viewDidLoad not being called by parent UITabBarController

    - by Adam Bishop
    Sample: I've created a minimal set of files that highlight the issue here: http://uploads.omega.org.uk/Foo3.zip If viewDidLoad/viewInitWithNibName are called, a message box is displayed. The message box is not displayed, therefore, the methods are not being called. Details: I have an application that is attempting to use a UITabBarController to switch between multiple views. The views are linked up to the UITabBarController using interface builder (select the tab page, open Attributes (Option-1), and fill in the NIB Name field), and so are displayed "automatically" with no extra code-behind to make them appear. Is it intended behaviour that views loaded like this do not have their viewDidLoad method executed? If not, how am I doing it wrong, and what do I need to change. If it is intended behaviour, I can think of a few work-arounds, but any suggestions are appreciated: Scrap the UITabBarController and implement the view switching myself (using initWithNibName and add/insert/push/Subview). Call each of the children's viewDidLoad method manually in the UITabBarController's own viewDidLoad method. Thank you in advance for any help you can offer.

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  • Add shadow to UIImage drawn in rounded path

    - by Tom Irving
    I'm drawing a rounded image in a UITableView cell like so: CGRect imageRect = CGRectMake(8, 8, 40, 40); CGFloat radius = 3; CGFloat minx = CGRectGetMinX(imageRect); CGFloat midx = CGRectGetMidX(imageRect); CGFloat maxx = CGRectGetMaxX(imageRect); CGFloat miny = CGRectGetMinY(imageRect); CGFloat midy = CGRectGetMidY(imageRect); CGFloat maxy = CGRectGetMaxY(imageRect); CGContextMoveToPoint(context, minx, midy); CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); CGContextClosePath(context); CGContextClip(context); [self.theImage drawInRect:imageRect]; This looks great, but I'd like to add a shadow to it for added effect. I've tried using something along the lines of: CGContextSetShadowWithColor(context, CGSizeMake(2, 2), 2, [[UIColor grayColor] CGColor]); CGContextFillPath(context); But this only works when the image has transparent areas, if the image isn't transparent at all, it won't even draw a shadow around the border. I'm wondering if there is something I'm doing wrong?

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  • Need content in UIWebView to display quickly

    - by leftspin
    Part of my app caches web pages for offline viewing. To do that, I am saving the HTML fetched from a site and rewriting img urls to point to a file on the local store. When I load the html into a UIWebView, it loads the images as expected and everything's fine. I am also caching stylesheets in this fashion. The problem is that when I put the phone into airplane mode, loading this cached html causes the UIWebView to display a blank screen and pause for a while before displaying the page. I've figured out that it's caused by non-cached URLs referenced from the original HTML doc that the web view is trying to fetch. These other URLs include images within the cached stylesheets, content in iframes, and javascript that opens a connection to fetch other resources. The pause happens when the UIWebView tries to fetch these resources, and the web page only appears after all these other fetches have timed out. My questions is, how can I make UIWebView just display the stuff I've cached immediately? Here are my thoughts: write even more code to cache these other references. This is potentially a ton more code to catch all the edge cases, etc., especially having to parse the Javascript to see what it loads after the page is loaded force UIWebView to time out immediately so there's no pause. I haven't figured out how to do this. somehow get what's already loaded to display even though the external references haven't finished fetching yet strip the code of all scripts, link tags and iframes to "erase" the external references. I've tried this one, but for some sites, the resultant page is severely messed up Can anyone help me here? I've been working on this forever, and am running out of ideas.

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  • objective c compare two date strings in NSDate

    - by mac
    Hi I am having two date as string , that is assigned to two labels, one label holds current date string, that is may 29, 2010 similarly the other date will be selected by user in this same format, i need to check the user date is present, past , or future. by comparing with current date string. please provide some sample code. Thanks in advance.

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  • UIWebView loading slow if using baseUrl

    - by ashish
    this works very well and fast but it does not load images if I give baseurl instead of nil. It takes few seconds to load. NSURL *myUrl = [[NSURL alloc] initFileURLWithPath:self.contentPath]; //NSLog(@”Content url is %@”,myUrl); NSString *string = [[NSString alloc]initWithContentsOfFile:self.contentPath encoding:NSASCIIStringEncoding error:nil]; [contentDisplay loadHTMLString:string baseURL:nil]; //here nil if replaced by myUrl webView takes time to load. Any help ? [string release]; [myUrl release];

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  • Problem releasing UIImageView after adding to UIScrollView

    - by Josiah Jordan
    I'm having a memory problem related to UIImageView. After adding this view to my UIScrollView, if I try to release the UIImageView the application crashes. According to the stack trace, something is calling [UIImageView stopAnimating] after [UIImageView dealloc] is called. However, if I don't release the view the memory is never freed up, and I've confirmed that there remains an extra retain call on the view after deallocating...which causes my total allocations to climb quickly and eventually crash the app after loading the view multiple times. I'm not sure what I'm doing wrong here though...I don't know what is trying to access the UIImageView after it has been released. I've included the relevant header and implementation code below (I'm using the Three20 framework, if that has anything to do with it...also, AppScrollView is just a UIScrollView that forwards the touchesEnded event to the next responder): Header: @interface PhotoHiResPreviewController : TTViewController <UIScrollViewDelegate> { NSString* imageURL; UIImage* hiResImage; UIImageView* imageView; UIView* mainView; AppScrollView* mainScrollView; } @property (nonatomic, retain) NSString* imageURL; @property (nonatomic, retain) NSString* imageShortURL; @property (nonatomic, retain) UIImage* hiResImage; @property (nonatomic, retain) UIImageView* imageView; - (id)initWithImageURL:(NSString*)imageTTURL; Implementation: @implementation PhotoHiResPreviewController @synthesize imageURL, hiResImage, imageView; - (id)initWithImageURL:(NSString*)imageTTURL { if (self = [super init]) { hiResImage = nil; NSString *documentsDirectory = [NSString stringWithString:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]]; [self setImageURL:[NSString stringWithFormat:@"%@/%@.jpg", documentsDirectory, imageTTURL]]; } return self; } - (void)loadView { [super loadView]; // Initialize the scroll view hiResImage = [UIImage imageWithContentsOfFile:self.imageURL]; CGSize photoSize = [hiResImage size]; mainScrollView = [[AppScrollView alloc] initWithFrame:[UIScreen mainScreen].bounds]; mainScrollView.autoresizingMask = ( UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight); mainScrollView.backgroundColor = [UIColor blackColor]; mainScrollView.contentSize = photoSize; mainScrollView.contentMode = UIViewContentModeScaleAspectFit; mainScrollView.delegate = self; // Create the image view and add it to the scrollview. UIImageView *tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, photoSize.width, photoSize.height)]; tempImageView.contentMode = UIViewContentModeCenter; [tempImageView setImage:hiResImage]; self.imageView = tempImageView; [tempImageView release]; [mainScrollView addSubview:imageView]; // Configure zooming. CGSize screenSize = [[UIScreen mainScreen] bounds].size; CGFloat widthRatio = screenSize.width / photoSize.width; CGFloat heightRatio = screenSize.height / photoSize.height; CGFloat initialZoom = (widthRatio > heightRatio) ? heightRatio : widthRatio; mainScrollView.maximumZoomScale = 3.0; mainScrollView.minimumZoomScale = initialZoom; mainScrollView.zoomScale = initialZoom; mainScrollView.bouncesZoom = YES; mainView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds]; mainView.autoresizingMask = ( UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight); mainView.backgroundColor = [UIColor blackColor]; mainView.contentMode = UIViewContentModeScaleAspectFit; [mainView addSubview:mainScrollView]; // Add to view self.view = mainView; [imageView release]; [mainScrollView release]; [mainView release]; } - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return imageView; } - (void)dealloc { mainScrollView.delegate = nil; TT_RELEASE_SAFELY(imageURL); TT_RELEASE_SAFELY(hiResImage); [super dealloc]; } I'm not sure how to get around this. If I remove the call to [imageView release] at the end of the loadView method everything works fine...but I have massive allocations that quickly climb to a breaking point. If I DO release it, however, there's that [UIImageView stopAnimating] call that crashes the application after the view is deallocated. Thanks for any help! I've been banging my head against this one for days. :-P Cheers, Josiah

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  • Animating sprites in Cocos2d

    - by Christian Budtz
    How do I avoid unneccesary deallocation? I'm running this code: CCSpriteFrameCache * cache = [CCSpriteFrameCache sharedSpriteFrameCache]; [cache addSpriteFramesWithFile:@"boosttexture.plist"]; CCAnimation * animation = [[CCAnimation alloc] initWithName:@"boosting" delay:1/24.0f]; [animation addFrame:[cache spriteFrameByName:@"ship.png"]]; [animation addFrame:[cache spriteFrameByName:@"ship_boost_l_r.png"]]; id action = [CCRepeatForever actionWithAction:[CCAnimate actionWithAnimation:animation]]; [spaceShipSprite runAction:action]; When the animaton is running (granted - its an ugly one), I get this in the console: 2010-04-14 13:40:16.311 Booster2K10Beta[521:20b] cocos2d: deallocing CCSpriteFrame = 00EBA620 | TextureName=4, Rect = (1.00,32.00,32.00,32.00) 2010-04-14 13:40:16.411 Booster2K10Beta[521:20b] cocos2d: deallocing CCSpriteFrame = 00EBA620 | TextureName=4, Rect = (1.00,32.00,32.00,32.00) 2010-04-14 13:40:16.496 Booster2K10Beta[521:20b] cocos2d: deallocing CCSpriteFrame = 00EBA620 | TextureName=4, Rect = (1.00,32.00,32.00,32.00) It seems unneccesary that the same SpriteFrame gets dealloc'ed 24 times per second - how do I avoid that?

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  • How do I make a UIBarButtonItem 'glow'?

    - by brianegge
    In the Maps app, when you press the tracking button in the lower left hand corner, it glows showing that it's pressed. This makes it behave like a radio button, and it will un-glow once you move the map. Is there a simple way to but a button into the pressed state?

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  • Stuck in itunesconnect submission version number limbo...

    - by Kevin Beimers
    I did a very very stupid thing. I was uploading an update to my app on itunesconnect, but typed in the wrong version number. The version number I typed (1.02) was smaller than the one that's already up there (1.1). Apple accepted the submission, and planned to upload binary later. Went to upload the binary (also 1.02), but only AFTER uploading did Apple inform me that it can't accept my binary because it's a smaller number than the current version. BUT I CAN'T CHANGE THE VERSION NUMBER IN THE SUBMISSION FORM. AND I CAN'T CANCEL THE UPDATE. [string of profanity symbols] So now, Apple is waiting for an update that it will never accept. Surely I'm not the only dope who's done this. I've written to the Contact Us form, but is there anything else I can do? Anyone else had to deal with this, if so, how long did it take to sort out? Thanks for anything on this, even if it's just moral support, -k.

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  • App is getting run in iOS 5.1.1 but crashed in iOS 6.1.3

    - by Jekil Patel
    I have implemented below code but app has been crashed in iPad with iOS version 6.1.3,while running perfectly in iPad with iOS version 5.1.1. when I am scrolling table view continuously it is crashed in ios version 6.1.3. what could be the issue. The implemented delegate and data source methods for the table view are as given below. #pragma mark - Table view data source -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. return [UserList count]; } -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 70; } -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; //cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; cell = nil; if (cell == nil) { // cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } UIImageView *imgViweback; imgViweback = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,0,0)]; imgViweback.image = [UIImage imageNamed:@"1scr-Student List Tab BG.png"]; UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 10, 32, 32)]; UIImageView *imageView1 = [[UIImageView alloc]initWithFrame:CGRectMake(12, 5, 50, 50)]; UILabel *lblName = [[UILabel alloc] initWithFrame:CGRectMake(110, 5, 200, 40)]; //cell.backgroundColor = [UIColor clearColor]; //cell.alpha = 0.5f; CountSelected = 0; flagQuizEnabled = NO; if ([[[checkedImages objectAtIndex:indexPath.row] valueForKey:@"checked"] isEqualToString:@"NO"]) { // cell.imageView.image = [UIImage imageNamed:@"Unchecked.png"]; //imageView.image = [UIImage imageNamed:@"Unchecked.png"]; } else { //imageView.image = [UIImage imageNamed:@"Checked.png"]; } NSString *pathTillApp=[[self getImagePath] stringByDeletingLastPathComponent]; NSLog(@"Path Till App %@",pathTillApp); NSString *makePath=[NSString stringWithFormat:@"%@%@",pathTillApp,[[UserList objectAtIndex:indexPath.row ]valueForKey:@"ImagePath"]]; NSLog(@"makepath=%@",makePath); imageView1.image = [UIImage imageWithContentsOfFile:makePath]; [cell.contentView insertSubview:imgViweback atIndex:0]; [cell.contentView insertSubview:imageView atIndex:0]; [cell.contentView insertSubview:imageView1 atIndex:2]; lblName.text =[NSString stringWithFormat:@"%@ %@",[[UserList objectAtIndex:indexPath.row] valueForKey:@"FirstName"],[[UserList objectAtIndex:indexPath.row] valueForKey:@"LastName"]]; lblName.backgroundColor = [UIColor clearColor]; lblName.font = [UIFont boldSystemFontOfSize:22.0f]; //lblName.font = [UIFont fontWithName:@"HelveticaNeue Heavy" size:22.0f]; lblName.font = [UIFont fontWithName:@"Chalkboard SE" size:22.0f]; [cell.contentView insertSubview:lblName atIndex:3]; [imgViweback release]; [imageView release]; [imageView1 release]; [lblName release]; imgViweback = nil; imageView = nil; imageView1 = nil; lblName = nil; //cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton; return cell; } #pragma mark - Table view delegate -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"Values : %@", Val); }

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  • Marrying Core Animation with OpenGL ES

    - by Ole Begemann
    Edit: I suppose instead of the long explanation below I might also ask: Sending -setNeedsDisplay to an instance of CAEAGLLayer does not cause the layer to redraw (i.e., -drawInContext: is not called). Instead, I get this console message: <GLLayer: 0x4d500b0>: calling -display has no effect. Is there a way around this issue? Can I invoke -drawInContext: when -setNeedsDisplay is called? Long explanation below: I have an OpenGL scene that I would like to animate using Core Animation animations. Following the standard approach to animate custom properties in a CALayer, I created a subclass of CAEAGLLayer and defined a property sceneCenterPoint in it whose value should be animated. My layer also holds a reference to the OpenGL renderer: #import <UIKit/UIKit.h> #import <QuartzCore/QuartzCore.h> #import "ES2Renderer.h" @interface GLLayer : CAEAGLLayer { ES2Renderer *renderer; } @property (nonatomic, retain) ES2Renderer *renderer; @property (nonatomic, assign) CGPoint sceneCenterPoint; I then declare the property @dynamic to let CA create the accessors, override +needsDisplayForKey: and implement -drawInContext: to pass the current value of the sceneCenterPoint property to the renderer and ask it to render the scene: #import "GLLayer.h" @implementation GLLayer @synthesize renderer; @dynamic sceneCenterPoint; + (BOOL) needsDisplayForKey:(NSString *)key { if ([key isEqualToString:@"sceneCenterPoint"]) { return YES; } else { return [super needsDisplayForKey:key]; } } - (void) drawInContext:(CGContextRef)ctx { self.renderer.centerPoint = self.sceneCenterPoint; [self.renderer render]; } ... (If you have access to the WWDC 2009 session videos, you can review this technique in session 303 ("Animated Drawing")). Now, when I create an explicit animation for the layer on the keyPath @"sceneCenterPoint", Core Animation should calculate the interpolated values for the custom properties and call -drawInContext: for each step of the animation: - (IBAction)animateButtonTapped:(id)sender { CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"sceneCenterPoint"]; animation.duration = 1.0; animation.fromValue = [NSValue valueWithCGPoint:CGPointZero]; animation.toValue = [NSValue valueWithCGPoint:CGPointMake(1.0f, 1.0f)]; [self.glView.layer addAnimation:animation forKey:nil]; } At least that is what would happen for a normal CALayer subclass. When I subclass CAEAGLLayer, I get this output on the console for each step of the animation: 2010-12-21 13:59:22.180 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect. 2010-12-21 13:59:22.198 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect. 2010-12-21 13:59:22.216 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect. 2010-12-21 13:59:22.233 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect. ... So it seems that, possibly for performance reasons, for OpenGL layers, -drawInContext: is not getting called because these layers do not use the standard -display method to draw themselves. Can anybody confirm that? Is there a way around it? Or can I not use the technique I laid out above? This would mean I would have to implement the animations manually in the OpenGL renderer (which is possible but not as elegant IMO).

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  • What means: libtool: -dynamic not specified the following flags are invalid: -ObjC

    - by Olie
    I inherited a project (lucky me!) which relies on a static library. Trying to build the static lib, I get this error: /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool: -dynamic not specified the following flags are invalid: -ObjC It is followed by these two lines, which I do understand, but this appears to be a separate problem (missing file.) /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool: can't locate file for: -lFlurryWithLocation /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool: file: -lFlurryWithLocation is not an object file (not allowed in a library) Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool failed with exit code 1 Am I wrong, and it's all related? Will the 1st line error go away if I fix the missing file part? Either way, what does the -dynamic not specified part of message mean? Thanks!

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  • Loop an UIScrollView

    - by Ilya
    Hi, I've got an UIScrollView and in it different images(about 30). I'd like to make it possible, when user reaches the last image to show the first one after it and so on. And I want to implement the same feature with the first image(to go to the last one). I'd like to loop the images smoothly that user won't even notice that he is making another loop. What is the best way to achieve this? Thanks.

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  • TTStyledTextLabel offset between link and regular text when changing from default font

    - by Guy Ephraim
    I'm using Three20 TTStyledTextLabel and when I change the default font (Helvetica) to something else it creates some kind of height difference between links and regular text The following code demonstrate my problem: #import <Three20/Three20.h> @interface TestController : UIViewController { } @end @implementation TestController -(id)init{ self = [super init]; TTStyledTextLabel* label = [[[TTStyledTextLabel alloc] initWithFrame:CGRectMake(0, 0, 320, 230)] autorelease]; label.text = [TTStyledText textFromXHTML:@"<a href=\"aa://link1\">link</a> text" lineBreaks:YES URLs:YES]; [label setFont:[UIFont systemFontOfSize:16]]; [[self view] addSubview:label]; TTStyledTextLabel* label2 = [[[TTStyledTextLabel alloc] initWithFrame:CGRectMake(0, 230, 320, 230)] autorelease]; label2.text = [TTStyledText textFromXHTML:@"<a href=\"aa://link1\">link2</a> text2" lineBreaks:YES URLs:YES]; [label2 setFont:[UIFont fontWithName:@"HelveticaNeue" size:16]]; [[self view] addSubview:label2]; return self; } @end In the screen shot you can see that the first link is aligned and the second one isn't How do I fix it? I think there is a bug in the TTStyledTextLabel code...

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  • how to make UIAlertView with custom font , height and width?

    - by shreya
    Hi All, I want to show pop up of question with it's options. Each question have 3 options. Currently the text is not fitting in the UIAlertView. My UIalertView is in landscape mode. my questions are, 1) How to change the font and font size of UIAlertView message and Button? 2) How to increase the height and width of UIAlertView? OR please suggest me any other way , by which I implement the same pop up. Thanks .

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