iphone os 4 - Page 119 - Developer IT

iphone google maps crosshair button

- by xastor

I would like to use or emulate a button like the gps button in the bottom left corner of the standard maps application on the iphone OS. The button behaves like a toggle button where gps is enabled or disabled depending on whether it is pushed and it may hold a small spinner component while the gps is finding your position. Does anyone know if this component can be easily constructed using default components? If no, what would be the best way to develop such a component? Is the crosshair/target icon a generic icon that I can re-use?

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Object mapping in objective-c (iphone) from JSON

- by freshfunk

For my iPhone app, I'm consuming a RESTful service and getting JSON. I've found libraries to deserialize this into an NSDictionary. However, I'm wondering if there are any libraries to deserialize the JSON/NSDictionary/Property List into my object (an arbitrary one on my side). The java equivalent would be the object-relational mappers although the sort of object mapping I'm looking for is relatively straightforward (simple data types, no complex relationships, etc.). I noticed that Objective-C does have introspection so it seems theoretically possible but I haven't found a library to do it. Or is there a simple way to load an object from an NSDictionary/Property List object that doesn't require modification every time the object changes? For example: { "id" : "user1", "name" : "mister foobar" "age" : 20 } gets loaded into object @interface User : NSObject { NSString *id; NSString *name; int *age; }

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Disable scrolling in an iPhone web application?

- by Stefan Kendall

Is there any way to completely disable web page scrolling in an iPhone web app? I've tried numerous things posted on google, but none seem to work. Here's my current header setup: <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=no;"/> <meta name="apple-mobile-web-app-capable" content="yes"/> document.body.addEventListener('touchmove', function(e){ e.preventDefault(); }); doesn't seem to work.

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Good GUI Design Tool to mock up iPhone & Android applications

- by Peter Delaney

I am about to embark on developing a mobile application for both the iPhone and the Android based phone. I have most of my gui mock ups written down on a white board and some in my head. I need to put them down on paper so I can relay my designs to others in my team. I was wondering what the best on-line gui mockup tool I could use? I have a lot of experience with Visio and I truly like it. I want a tool that would be web based so I could collaborate with others on the team. Does anyone have a suggestion for an easy gui mockup tool that I could use?

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iphone dev: UIImageview subclass interface builder - how to call custom initializer

- by ninjasmith

hi. I messing with iphone developement. I have a uiimageview subclass that I want to use to detect touches. I have sucessfully added to interfacebuilder and I can detect a touch in my UIImageview subclass within my application so all is good on that front. however my UIImageView subclass has a custom initializer which is not called when it is created in interface builder. if I manually initialize the UIImageview and add it programmatically I think it will work but then I lose the ability to 'see' my positioning in Interface builder. how can I either 1) 'see' a uiimageview in interface builder that is added in code? (not possible?) 2) call my custom initializer when the subclass is instantiated in interfacebuilder. thanks

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iPhone Mapkit Blue Dot / User Location Region Zoom Question

- by user290031

Hey All, Is is possible to set a region based on a current location in a mapview only one time. I want my iphone app to get the current location, zoom into that current location, and then allow the user to scroll around. However, because my setRegion code is in my didUpdateToLocation function, every time the current location is updated, so is the region, and I can't scroll around on the map. I tried putting this setRegion code in the viewDidLoad function, but the user's current location isn't initialized at this point, so it doesn't work right. Any ideas?

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RPG Game loop and class structure (cocos2D for iPhone)

- by mac_55

I'm looking to make an RPG with Cocos2D on the iPhone. I've done a fair bit of research, and I really like the model Cocos2D uses for scenes. I can instantiate a scene, set up my characters etc. and it all works really nicely... what I have problems with is structuring a game loop and separating the code from the scenes. For example, where do I put my code that will maintain the state of the game across multiple scenes? and do I put the code for events that get fired in a scene in that scene's class? or do I have some other class that separates the init code from the logic? Also, I've read a lot of tutorials that mention changing scenes, but I've read none that talk about updating a scene - taking input from the user and updating the display based on that. Does that happen in the scene object, or in a separate display engine type class. Thanks in advance!

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IPhone Example : Login Page and then Navigate to another Screen (UI Table View)

- by Smc

Hi, I am an .Net Expert but a new to the IPhone App Development. Recently I have started workinf on Objective - c. I need a help I need a example which shows a Login Screen and then Navigates to the another Screen (UITableView) when username and password and found correct. As of now I am assuming that username and passwords are hardcoded in app. I have tried to Design the Screen for Login UI but unable to Load the another ViewController but it wont worked Can some one help me out with examples, Links?

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Unit Testing iPhone - Linker Errors

- by sliver

I've followed the Unit Testing Applications guide from the iPhone Development documentation. I followed all the steps and it worked with the TestCase from the documentation. But as soon as I changed the TestCase to test real Code from my project I ended up with linker errors. All classes that are used in the TestCase are reported as missing. I've already searched the internet and found that the Bundle Loader property must be set to "$(BUILT_PRODUCTS_DIR)/MyApplication.app/Contents/MacOS/MyApplication". But this also fails because the file could not be found. Any ideas what I have to do to tell the linker where to search for the missing files?

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iPhone Provisioning: What's it all about?

- by david van brink

Grepping around, I see that I'm not AT ALL alone in being... challenged... by the process of setting up an iPhone app, getting it to run, giving it my testers, and so on. I've gotten it to work. Somehow I emailed a copy or two to testers, and eventually got my li'l app into the store, and that was fine. But I can't say a really, deeply understand it! (And I don't do iDev every day. Even now my recollection of what I did is kind-of hazy.) I'm moderately capable of understanding things, if presented, well, you know, in a way I can understand. Can anyone point me to a crystal clear explanation of what provisioning actually is? I feel that if I understood it, the recipes to do it would be obvious. Thanks!

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Best way to learn iphone audio queue services, step by step tutorial

- by optician

Hi Everyone, I'm trying to learn how to handle audio at a fairly low level with audio queue services. I have been progrmaing in memory managed languages for quite a while, and have just completed the c programing tutorial by vtc (2007). This has left me comfortable with the understanding of pointers and memory allocation, but the apple documention still leaves me wanting for a simpler implenation and explaination. Maybe I need to learn objective c and cocoa better. I have heard that this book is good. Cocoa(R) Programming for Mac(R) OS X (3rd Edition) Could someone suggest a learning path that is going to help me get an better understanding of working with audio and an iphone. I want to be able to play mp3 files back and also alter the pitch of them as they are playing. I am prepared that I may have to temporarily convert the mp3 files into pcm files to do things like that to them. Thanks everyone.

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iphone compass tilt compensation

- by m01d

hi, has anybody already programmed a iphone compass heading tilt compensation? i have got some approaches, but some help or a better solution would be cool! FIRST i define a vector Ev, calculated out of the cross product of Gv and Hv. Gv is a gravity vector i build out of the accelerometer values and Hv is an heading vector built out the magnetometer values. Ev stands perpendicular on Gv and Hv, so it is heading to horizonatl East. SECOND i define a vector Rv, calculated out of the cross product Bv and Gv. Bv is my looking vector and it is defined as [0,0,-1]. Rv is perpendicular to Gv and Bv and shows always to the right. THIRD the angle between these two vectors, Ev and Rv, should be my corrected heading. to calculate the angle i build the dot product and thereof the arcos. phi = arcos ( Ev * Rv / |Ev| * |Rv| ) Theoretically it should work, but maybe i have to normalize the vectors?! Has anybody got a solution for this? Thanks, m01d

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iPhone web apps running as native apps

- by Henrikb4

The browser on the iPhone is capable of using advanced web technologies introduced in HTML5. One of these is the app cache that allows web pages to run on the client, from the cache, without a connection to the internet. Together with Local Storage you can also save data permanently "in" the page. My question is, would it then be possible to make a website that when visited and set as a web clip (bookmark on the home screen), could be accessed again, at any moment. Using HTML5, Javascript and css, you can make some very good apps and at the same time avoid the pricey developer fee, the harsh app approval and the single platform development platform? Or am I just dreaming?

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Objective-C runtime reflection (objc_msgSend): does it violate the iPhone Developer License Agreemen

- by GamingHorror

Does code like this (potentially) violate the iPhone Developer License Agreement? Class clazz = NSClassFromString(@"WNEntity"); id entity = [clazz entityWithImage:@"Icon.png"]; SEL setPositionSelector = NSSelectorFromString(@"setPosition:"); objc_msgSend(entity, setPositionSelector, CGPointMake(200, 100)); I'm working on code that dynamically allocates classes from XML and calls methods on them via objc_msgSend. It's just very convenient constructing my objects that way but it worries me because i have no idea whether this is ok or violates the License by dynamically executing code or maybe even calling private (?) API functions. They wouldn't be documented if they were private, right? Can someone shed some light on this? Have you had an App approved or rejected using code similar to the above? I'm pretty sure that this is ok but i wan't to hear it from someone else! :)

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hide keyboard in iphone safari webapp

- by munchybunch

I'm creating a webapp for the iPhone, based in HTML/CSS/JS. I'm using forms to receive input and pass data to the script, but a problem I'm encountering is that the keyboard won't disappear. The user will enter the information, hit submit, and since it's JavaScript the page doesn't reload. The keyboard remains in place, which is a nuisance and adds another step for users (having to close it). Is there any way to force the keyboard in Safari to go away? Essentially, I have a feeling this question is equivalent to asking how I can force an input box to lose focus or to blur. Looking online, I find plenty of examples to detect the blur event, but none to force this event to occur.

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How to find (in javascript) the current "scroll" offset in mobile safari / iphone

- by mintywalker

I'd like to know the x/y offset of the how far the user has "scrolled" within the viewport in mobile safari on the iphone. Put another way, if I (through javascript) reloaded the current page, I'd like to find the values I'd need to pass into window.scrollTo(...) in order to reposition the document/viewport as it is currently. window.pageXOffset always reports 0 jquery's $('body').scrollTop() always reports 0 events have a pageX, but this won't account for the scrolling of the page that happens after you release your finger if your gesture was to "flick" the page up/down. Namely, it'll give me a point when the finger leaves the screen, but that doesn't always match where the page will be after it's finished scrolling. Any pointers?

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J2ME VS Android VS iPhone VS Symbian VS Windows CE

- by Sadi

I have very little idea about mobile platform, though I am interested to program for mobile platform. Would you please compare between J2ME VS Android VS iPhone VS Symbian VS Windows CE. I would like to know which one is better, and if there is any VM technology to test the programs. Which one should I choose and why? Is there any IDE, debugging facilities? Personally I would like to code for open source, but any suggestion are welcome. I have preliminary knowledge on java. I would also like to know, if there is anything else that you can recommended. Thank you

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how many fps can iPhone's UIGetScreenImage() actually do?

- by M Katz

Now that Apple is officially allowing UIGetScreenImage() to be used in iPhone apps, I've seen a number of blogs saying that this "opens the floodgates" for video capture on iPhones, including older models. But I've also seen blogs that say the fastest frame rate they can get with UIGetScreenImage() is like 6 FPS. Can anyone share specific frame-rate results you've gotten with UIGetScreenImage() (or other approved APIs)? Does restricting the area of the screen captured improve frame rate significantly? Also, for the wishful thinking segment of today's program, does anyone have pointers to code/library that uses UIGetScreenImage() to capture video? For instance, I'd like an API something like Capture( int fps, Rect bounds, int durationMs ) that would turn on the camera and for the given duration record a sequence of .png files at the given frame rate, copying from the given screen rect.

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WS-Security on iphone, is it possible?

- by emmanuel.aquino

Hello, I'm new here and I'm facing a problem. I need to know if it is possible to implement the WS-Security protocol with X.509 certificates on a native iPhone application. I haven't found much information on the web, except this information from Apple about security services. I just want to ask, is it possible? has it been made before?. If it is posbile, can you point me in the right direction?. Thanks in advance.

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iPhone UIWebView width does not fit after zooming operation + UIInterfaceOrientation change

- by choonkeat

I created a bare bones iPhone app with a UIWebView (Scales Page to Fit = YES, shouldAutorotateToInterfaceOrientation = YES) and loaded a webpage, e.g. http://stackoverflow.com/ Rotating the device shows that UIWebView is auto-resized to fit the width. Good. Incorrect: Zoom into the page and zoom out. Now rotating the device shows UIWebView in a weird width in one of the orientation (if u zoom in landscape, the portrait width is weird, vice versa). This behavior is fixed only when you navigate to another page. Correct: Load the same URL in Mobile Safari. Rotating works & the width fits regardless of the zooming exercise. Is this a UIWebView bug (probably not)? Or is there something that needs to be done to make things "just work" like in Mobile Safari?

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best way to save data in ipod touch/iphone objective-c

- by Leonardo

Hi all, I am writing a very simple application, for iphone. Unfortunately I am really a newbie. What I am trying to do is to save data at the end of a user experience. These data are really simple, only string or int, or some array. Later I want to be able to retrieve that data, therefore I also need an event id (I suppose). Could you please point out the best way, api or technology to achieve that, xml, plain text, serialization... ? many thanks Leonardo

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Get json from Twitter API in iPhone using JSON Framework

- by jozei

Hello now I'm trying to get json data from Twitter API using iPhone. I'm using JSON Framework. This code has good results. #import "JSON/JSON.h" NSString *urlString= @"http://api.twitter.com/1/statuses/public_timeline.json"; NSURL *url = [NSURL URLWithString:urlString]; NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil]; NSLog(@"%@", jsonString); But when I change API's URL like "http://search.twitter.com/trends/current.json" the above code gets SIGABRT error. Could someone explain it to me? Thanks.

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Simplest way on iPhone to unzip downloaded file?

- by Scott Pendleton

Goal: download a zipped file, unzip it, and save it in the iPhone app's Documents directory. The following code makes use of the initWithGzippedData method that was added to NSData in the Molecule app found here: http://www.sunsetlakesoftware.com/molecules As adapted to my app: NSString *sFolder = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSString *sFileName = [sFolder stringByAppendingPathComponent:@"MyFile.db"]; NSURL *oURL = [NSURL URLWithString: @"http://www.isystant.com/Files/MyFile.zip"]; NSData *oZipData = [NSData dataWithContentsOfURL: oURL]; NSData *oData = [[NSData alloc] initWithGzippedData:oZipData]; [oZipData release]; b = [oData writeToFile:sFileName atomically:NO]; NSLog(@"Unzip %i", b); Result: A zip file is successfully downloaded. From it a new, supposedly unzipped file is created in the Documents directory with the desired name (MyFile.db) but it has zero bytes. Anybody see the problem? Or else is there a simpler way to unzip a downloaded file than the one used in the Molecules app?

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Dynamically load nib for iPhone/iPad within view controller

- by qui

Hello I have converted an iPhone application using the wizard like thing in XCode into a universal app. It builds fine but obviously looks a bit rubbish in some areas :) I need to load nibs according to which device is being used. I dont wish to create my view controllers using initWithNib as I already have code to create the controllers with some data (initWithMyLovelyData) which doesnt do anything to do with nib loading. I know to find out the device you use UI_USER_INTERFACE_IDIOT() so I tried overriding the initWithNibName within the actual view controllers themselves, assuming they get called internally somehow. But it's not working as I guess I am unsure of the syntax. I have tried if(ipad..) self = [super initWithNibName:@"MyIpadNib" bundle:nibBundleOrNil]; And that doesnt work :/ EDIT - I know I have massively edited this, made my question a bit more specific after doing some more research - apologies!

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- by xastor

- by freshfunk

- by Stefan Kendall

- by Peter Delaney

- by ninjasmith

- by user290031

- by mac_55

- by Smc

- by sliver

- by david van brink

- by optician

- by m01d

- by Henrikb4

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- by munchybunch

- by mintywalker

- by Sadi

- by M Katz

- by emmanuel.aquino

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