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  • Does NSArray:lastObject return an autoreleased object?

    - by Kyle
    I'm working on an iPhone project where I would like to retrieve an object from an NSMutableArray, remove the object from the array and then use it later. The code looks something like this: NSMutableArray * array; // fill the array NSObject * obj = [array lastObject]; [array removeLastObject]; // do something with obj (in the same function) array is the only entity with a retain on the object that is being accessed. Is this safe to do? I would assume that this would only work if lastObject autoreleased the object which is something that I can't figure out if it does.

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  • Setting the background colour/highlight colour for a given string range using Core Text

    - by Jasarien
    I have some text laid out using Core Text in my iPhone app. I'm using NSAttributedString to set certain styles within the text for given ranges. I can't seem to find an attribute for setting a background / highlight colour, though it would seem it is possible. I couldn't find an attribute name constant that sounded relevant and the documentation only lists: kCTCharacterShapeAttributeName kCTFontAttributeName kCTKernAttributeName kCTLigatureAttributeName kCTForegroundColorAttributeName kCTForegroundColorFromContextAttributeName kCTParagraphStyleAttributeName kCTStrokeWidthAttributeName kCTStrokeColorAttributeName kCTSuperscriptAttributeName kCTUnderlineColorAttributeName kCTUnderlineStyleAttributeName kCTVerticalFormsAttributeName kCTGlyphInfoAttributeName kCTRunDelegateAttributeName Craig Hockenberry, developer of Twitterrific has said publicly on Twitter that he uses Core Text to render the tweets, and Twitterrific has this background / highlight that I'm talking about when you touch a link. Any help or pointers in the right direction would be fantastic, thanks. Edit: Here's a link to the tweet Craig posted mentioning "Core text, attributed strings and a lot of hard work", and the follow up that mentioned using CTFrameSetter metrics to work out if touches intersect with links.

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  • How do you make a UIBarButtonItem animation flip?

    - by Andrew Arrow
    In the iPod app on the iPhone there is a UIBarButtonItem in the upper right toolbar that flips between the song and track listings for the album. When you select the button, the button itself does a flip animation. Is there a way to do this with: CGContextRef context = UIGraphicsGetCurrentContext(); [UIView beginAnimations:nil context:context]; [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromLeft forView:[self superview] cache:YES]; Do I need to make a UIBarButtonItem with initWithCustomView vs. initWithImage to achieve this?

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  • Why doesn't border-radius work properly on text inputs in MobileSafari?

    - by abrahamvegh
    Here is a reference HTML document: <!DOCTYPE html> <html> <head> <style> body { background-color: #000; } input { -webkit-border-radius: 20px; } </style> </head> <body> <input type="text" value="text" /> </body> </html> The border-radius renders fine on Safari/WebKit-based desktop browsers, but on the "MobileSafari" variant, namely the iPhone and iPad browsers, it renders with this strange box, which destroys the illusion of rounded corners when the input is being displayed on top of a differently-colored background.

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  • take out objects from randomizer obj c

    - by David Pollak
    hello everyone, I'm a new "developer" trying to build some iPhone app I'm making an app which gets text from a list of objects in a NSArray and then randomizes them and display one in a TextView, here's the code: - (IBAction)azione{ NSArray *myArray= [NSArray arrayWithObjects: @"Pasta",@"Pizza",@"Wait",@"Go", nil]; int length = [myArray count]; int chosen = arc4random() % length; testo.text = [myArray objectAtIndex: chosen]; } what I want to do now, is when I open the app and get a random object, to take it out from the list, so that it won't be picked again ex. I open the appI get "Pizza"Do the action againI don't get "Pizza" anymore, only "Pasta" "Wait" and "Go" What should I do ? Which code should I use ? Thanks for answers

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  • How to remove previous versions of Xcode

    - by Ed Marty
    When the 3.2 beta of the iPhone OS first came out, Xcode for 3.2 had to be installed side-by-side with the version for 3.1.2. I installed the new version (3.2) in /Developer and moved 3.1.2 to /Xcode3.1.2. Now I want to get rid of the old version and just use the new one since we can do that now. I ran the uninstall tool at /Xcode3.1.2/Library/uninstall-devtools and uninstall-developer-folder, but the directory still exists and has lots of stuff still in it, adding up to about 5 GB. At this point, am I safe just deleting the folder if I want to totally get rid of it and still use the /Developer folder? (At about 8 GB, it's got lots more in it, but I'm not sure if that's just because it's larger or because the old version was 8 GB before I ran the uninstall tool)?

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  • When Debugging in Xcode what does "out of scope" mean?

    - by Buffernet
    I'm in xcode debugging my iphone application. when i get to a break point and I roll over my object and properties of that object say "out of scope" instead of their respective values. Here's what I do: I have inited a view with nib name (initwithnibname). Then set the property of that view to the object that I want. I have placed the breakpoint in the viewwillappear method. I rollover my reference to the variable that was is my property. All properties in the object say "out of scope" Does anyone know why this is happening?

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  • UIView Subview Does not autoresize on orientation change

    - by Jason
    In my iPhone app, I have a view controller with two views (essentially, a front & back view). The front view is the main UIView, and the back view is a secondary UIView which is added as a subview using [self.view addSubview:backView] when showing the back and [backView removeFromSuperview] when hiding it. However, when the orientation changes, I have the following issue: the main UIView (frontView) rotates & all of its elements resize properly, but the secondary/subview UIView (backView) does not rotate & all of its elements do not resize properly. Does anyone have suggestions on how to make the secondary UIView autoresize properly according to the rules I have set in Interface Builder?

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  • How to load a UIView from a tap?

    - by balexandre
    Hi, I'm new to iPhone Development and I did some examples and seen code and code and more code but I still can't get the when the user taps here show this view using this animation, and go back after (user taps a back button) I did some Tab Bar examples, Utility examples, etc but when I start a project from scratch the code never does what I want :-/ every time I create a View (xib) I also create the controller (h and m files), as all examples are like this, and I have no idea if I can only create 4 Views and just have one controller :-( when a user taps a UITableCell how can I load a new view using an animation? and how can I go back to the UITableCell the user was? kind'a (in C#) myNewForm f = new myNewForm(); f.show(); ... this.Close(); If someone can share some knowledge or a tutorial or a screencast, I will greatly appreciate Thank you!

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  • Obj-C : Passing parameters back from a detailViewController in a navigation controller

    - by Garfield81
    Hi I am using a navigation Controller on an iPhone app. I am able to pass data forward when I push a controller into the navigation stack but how do I pass data back when I pop the controller. What I am basically trying to achieve is the root navigation controller view displays a number of fields that can be edited. A user then clicks on one of the fields to be edited and a EditViewController is pushed onto the stack with the name of the field the user wants to edit. Now the users enters the new value of the field and presses save to pop the view controller. So how do I get the value from the editViewController back to the root navigation controller view?

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  • Can I disable UIPickerView scroll sound?

    - by cocoaholic
    Hi, I want to disable the annoying clicks that the UIPickerView generates upon scrolling up and down. Is there a way to do this? I want to play short sounds for each item that the picker view lands upon. It gets ruined by the built in sound. I understand that the picker sounds can be turned off globally by switching off the keyboard sounds in iPhone/iPod settings. But is there a way to programatically do this? Any help will be much appreciated! Thanks

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  • Is is possible to derive currency symbol from currency code?

    - by Dave Hunt
    My iPhone app formats an NSDecimalNumber as a currency using setCurrencyCode, however another screen displays just the currency symbol. Rather than storing both the currency code and symbol, is it possible to derive the symbol from the code? I thought the following might work, but it just returns the symbol as $: currencyCode = [dictPrices valueForKey:@"currencyCode"]; NSNumberFormatter *numberFormatter = [[[NSNumberFormatter alloc] init] autorelease]; [numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4]; [numberFormatter setCurrencyCode:currencyCode]; [numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle]; NSString *currencySymbol = [numberFormatter currencySymbol];

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  • Box2d Documentation - Outdated, any better api refs?

    - by GONeale
    Hi guys, I am working with cocos2d + box2d and as I look through the 'Hello World' tutorial and attempt others I am finding many constructs which do not seem to be documented in the latest api ref. Would anybody be able to shed some light on what's going on? or point me in the right direction to someone who has covered the new constructs such as b2PolygonDef changing to b2PolygonShape and likewise for circle + who knows what else, seems there has not been any doc updates since August '09. This is the only information I could find on the issue, of another user stating they have found many mismatches also. http://www.cocos2d-iphone.org/forum/topic/1683

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  • Core Data store corruption

    - by sehugg
    A handful of customers for my iPhone app are experiencing Core Data store corruption (I assume so, since the error is "Failed to save to data store: Operation could not be completed. (Cocoa error 259.)") Has anyone else experienced this kind of store corruption? I am worried since I aim to soon push an update which performs a schema migration, and I am worried that this will expose even more problems. I had assumed that the Core Data/SQLlite APIs use atomic operations and are immune to corruption except if the underlying filesystem experiences corruption. Is there a way to reduce/prevent corruption, or at least a good way to reproduce (I have been unsuccessful thus far).

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  • Xcode compile error: Can't find an (old) file I used to have

    - by Carol
    This is what happens when I try to compile my iPhone app with Xcode v3.1.4 What in the world does it all mean? (And how do I fix it?) Processing /Users/carol/Documents/MyApp/build/Release-iphonesimulator/MyApp.app/Info.plist TabBarDemo2-Info.plist cd /Users/carol/Documents/MyApp setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" TabBarDemo2-Info.plist -genpkginfo /Users/carol/Documents/MyApp/build/Release-iphonesimulator/MyApp.app/PkgInfo -expandbuildsettings -format binary -o /Users/carol/Documents/MyApp/build/Release-iphonesimulator/MyApp.app/Info.plist error: The file “TabBarDemo2-Info.plist” does not exist.

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  • write() causes fatal crash when filedescriptor becomes invalid

    - by ckrames1234
    I'm writing an iPhone App with a webserver in it. To handle a web request, I take the web request and write() to it the data that I want to send back. When I try to download a moderately sized file (3-6MB) it works fine, but if I cancel the download halfway through, the app crashes and leaves no trace of an error. I'm thinking that the file descriptor becomes invalid halfway through the write, and causes the crash. I really don't know if this is what causes the crash, i'm just assuming. I'm basing my webserver off of this example. NSString *header = @""; NSData *data = [NSData dataWithContentsOfFile:fullPath]; write (fd, [header UTF8String], [header length]); write(fd, [data bytes], [data length]); close(fd); Does anyone know how to fix this? I was thinking about chunking the data and then writing each part, but I don't think it would help.

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  • Good way to make animations with cocos2d?

    - by Johnny Oin
    Hi there, I'm making a little iphone game, and I would get some clues. Let's imagine: Two background sprites moving pretty fast from right to left, and moving up and down with accelerometer. I guess I can't use animations here, cause the movement of the background is recalculated at each frame. So I use a schedule with an interval of 0.025s and move my sprites at each clock with a : sprite.position = ccp(x, y); So here is my problem: the result is laggy, with only these two sprites. I tried both declaring sprites in the header, and getting them with CCNodes and Tags. It's quite the same. So if someone can give me a hint on what is the best way to do that, that would be so nice. I wonder if the problem can't be the fact that sprites are moving very fast, but i'm not sure. Anyway, thanks for your time. J.

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  • NSData to NSString by changing the value null is returned. I need you help

    - by kevin
    *cipher.h, cipher.m all code : http://watchitlater.com/blog/2010/02/java-and-iphone-aes-interoperability Cipher.m -(NSData *)encrypt:(NSData *)plainText{ return [self transform:KCCEncrypt data:plainText; } step1. Cipher *cipher = [[Cipher alloc]initWithKey:@"1234567890"]; NSData *input = [@"kevin" dataUsingEncoding:NSUTF8StringEncoding]; NSData *data = [cipher encrypt:input]; data variables NSLog print : <4d1c4d7f 1592718c fd588cec 84053e35 step2. NSString *changeVal = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; data variables NSLog print : null NSData to NSString by changing the value null is returned. By converting NSString NSURLConnection want to transfer. I need you help

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  • How to determine UINavigationBar custom view text/shadow color for different styles in UISplitViewCo

    - by Cal
    I have a splitview with a pop over master view using UINavigationController. The problem is I have some custom text views in the header of the nav controller and when it switches to the pop-over view the style of the nav bar changes. This makes the colors of the text clash since they are no longer using the correct settings for the new navbar style. How do you determine the proper default text colors for a given navigation bar (style)? The issue is because I'm using a split view in the iPad but you should be able to determine the proper colors for an iPhone nav bar too.

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  • Objective-C to Java cross compiler

    - by mvid
    It is clear that cross compilers will not be allowed by the Apple App Store, so a developer will need to be familiar with Objective-C to create applications for the iPhone. I was wondering, is there a cross compiler that will take Objective-C application code and rebuild it into a similar Java application that can be packaged for Android? That way, a developer could still learn just one language (obj-c) but put out applications on many devices. I understand that the Java port would be less optimal than a natively coded application, but could conceivably save a developer some time.

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  • NSMutableUrlRequest eats plus signs

    - by Mike
    I create NSMutableUrlRequest for sending data to server, add all necessary fields to it and then add the string for sending like this: [theRequest setHTTPBody:[postString dataUsingEncoding: NSUTF8StringEncoding]]; postString is a usual NSString. The problem is, when I receive this request at the server, all the plus (+) signs disappear from the http body. So if I had "abcde+fghj" on iPhone, I get "abcde fghj" on the server". Can this be some encoding problem from using dataUsingEncoding: NSUTF8StringEncoding? Or some NSMutableUrlRequest stripping feature? What can I do to make it stop stripping plus signs? I need to receive UTF8 strings at the server side.

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  • Is an object in objective-c EVER created without going through alloc?

    - by Jared P
    Hi, I know that there are functions in the objective-c runtime that allow you to create objects directly, such as class_createInstance. What I would like to know is if anything actually uses these functions other than the root classes' (NSObject) alloc method. I think things like KVC bindings might, but those aren't present on the iPhone OS (to my knowledge, correct me if I'm wrong), so is there anything that would do this? In case you're wondering/it matters, I'm looking to allocate the size of an instance in a way that circumvents the objc runtime by declaring no ivars on a class, but overriding the +alloc method and calling class_createInstance(self, numberofbytesofmyivars). Thanks

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  • UIImagePickerController camera preview is portrait in landscape app

    - by Jane Sales
    In my landscape-only iPhone application, I launch a UIImagePickerController to take a photo, but the live image displayed from the camera is in portrait orientation, with blank space around it. The image is rotated. Once the camera button is pressed, the preview is very messy, with most of the preview off screen, and views not correctly aligned. Apple has acknowledged that this is defect, and is working on it. My question is, does anyone have a work-around (legal or illegal) that would allow me to get this working now. I wouldn't release to the App Store with an illegal fix, but I would have a much better app for user testing - currently the camera is pretty much unusable in landscape. I will attach a simple test project and images if I can. Edit - just to clarify, the image I get is correctly landscape. I want the camera & preview UIs to look right!

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  • Triggering shouldStartLoadWithRequest with multiple window.location.href calls

    - by AlBeebe
    Im trying to pass multiple things from a webpage inside a UIWebView back to my iPhone app via the shouldStartLoadWithRequest method of the UIWebView. Basically my webpage calls window.location.href = "command://foo=bar" and i am able to intercept that in my app no problem. Now if i create a loop and do multiple window.location.href calls at once, then shouldStartLoadWithRequest only appears to get called on once and the call it gets is the very last firing of window.location.href at the end of the loop. The same thing happens with the webview for Android, only the last window.location.href gets processed.

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  • HTML5 Cache manifest file itself is not cached, and called at each resource load

    - by Mic
    We have a web app that runs on the iPhone.The manifest file is ok, and the resources(html, css, js) are cached correctly.The page sits in the home screen. The trouble is, when the page loads a resource from the cache, there is as well a GET call to the server to read the Cache Manifest file.The server is configured to send the correct header (max-age=31536000; public, etc...) and caches well all other files except the cache manifest itself. Is this a normal behavior? It looks there is a slight lag, because of that call, for each resource load.Any idea, if these multiple calls can get a status 304 or even better avoided?

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