2014/10/15 下午 10:13:38
iphone Programming Glossary: sampleHow do I record audio on iPhone with AVAudioRecorder? http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder only reference to the classes. I am a newbie at iPhone development so I am looking for a simple sample to get me started. Thanks in advance. iphone audio recording share improve this question Actually.. is triggered by the user pressing a button on the navBar. The recording uses cd quality 44100 samples stereo 2 channels linear pcm. Beware if you want to use a different format especially an encoded one..
Parsing XML in iPhone [closed] http://stackoverflow.com/questions/1021102/parsing-xml-in-iphone I need to parse simple XML coming from my webserver and store this in database. Is there any sample code for doing the same iphone xml parsing share improve this question Please have a look at Touch..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present way is to move up down the view having textfields whenever the keyboard is shown. Here is some sample code #define kOFFSET_FOR_KEYBOARD 80.0 void keyboardWillShow Animate the current view out of the way..
http://stackoverflow.com/questions/1388467/reading-epub-format available to develop this I have no idea about how to read this file format. I tried to parse a sample file with .epub extension using NSXML Parser but that fails. iphone epub share improve this question..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone a bitmap representation in which I could extract this information for a given pixel A working code sample would be most appreciated and note that I am not concerned with the alpha value. iphone cocoa touch..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview way. iphone uitableview uitableviewcell share improve this question In Apple's Accessory sample the following method is used button addTarget self action @selector checkButtonTapped forControlEvents..
iPhone ivar naming convention [duplicate] http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention and as another responder noted to avoid conflict with incoming parameter names. Even in Apple sample code the use is mixed. However I greatly prefer to not use the _ prefix and have two strong reasons..
JSON and Core Data on the iPhone http://stackoverflow.com/questions/2362323/json-and-core-data-on-the-iphone preserving the relationship between entities . I have searched unsuccessfully for a tutorial code sample on this point so any assistance would be gratefully received. iphone objective c json core data share..
http://stackoverflow.com/questions/2371489/why-do-you-use-an-underscore-for-an-instance-variable-but-not-its-corresponding development.I am doing research on voice recording in iphone .I have downloaded the speak here sample program from Apple.It consist of LevelMeter.h file in which @interface LevelMeter UIView CGFloat _level..
http://stackoverflow.com/questions/3339722/check-iphone-ios-version if CLLocationManager headingAvailable Do something Apple uses systemVersion in their GLSprite sample code so my recommendation can't be absolute A system version of 3.1 or greater is required to use CADisplayLink...
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure.. yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how to implement it into an actual project. iphone audio fft .. was 44.1kHz so that's ~44 frames sec. So our time window is whatever the time duration of 1024 samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate..
http://stackoverflow.com/questions/37464/iphone-app-minus-app-store you can use the following method which I have personally tested using the AccelerometerGraph sample app on iPhone OS 3.0. Create Self Signed Certificate First you'll need to create a self signed certificate..
iphone/ipad: How exactly use NSAttributedString? http://stackoverflow.com/questions/3786528/iphone-ipad-how-exactly-use-nsattributedstring methods for setting the attributes of an NSAttributedString from UIKit classes. From the sample provided in the repo #import NSAttributedString Attributes.h #import OHAttributedLabel.h 1 Build the..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage..
How do I do base64 encoding on iphone-sdk? http://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers CS193P class notes that they have left on the web. It includes lecture notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth..
iPhone UIView Animation Best Practice http://stackoverflow.com/questions/630265/iphone-uiview-animation-best-practice best practice for animating view transitions on the iPhone For example the ViewTransitions sample project from apple uses code like CATransition applicationLoadViewIn CATransition animation applicationLoadViewIn..
Has anyone implemented the PayPal API through a native iPhone app? http://stackoverflow.com/questions/779423/has-anyone-implemented-the-paypal-api-through-a-native-iphone-app the user would need to use their API key. Does this sound right and has anyone got or seen any sample code I have to think this is a common piece of code. UPDATE Will Apple allow this It is a charity app..
Is there a barcode recognition framework for iOS? http://stackoverflow.com/questions/838724/is-there-a-barcode-recognition-framework-for-ios there a barcode recognition framework for iOS Is there a framework or other sample code for doing barcode recognition on iPhone iPad iphone ios cocoa touch barcode share improve this..
How do I record audio on iPhone with AVAudioRecorder? http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder examples of how to best do this in the iPhone Dev Center and only reference to the classes. I am a newbie at iPhone development so I am looking for a simple sample to get me started. Thanks in advance. iphone audio recording share improve this question Actually there are no examples at all. Here is my working code. Recording.. there are no examples at all. Here is my working code. Recording is triggered by the user pressing a button on the navBar. The recording uses cd quality 44100 samples stereo 2 channels linear pcm. Beware if you want to use a different format especially an encoded one make sure you fully understand how to set the AVAudioRecorder..
Parsing XML in iPhone [closed] http://stackoverflow.com/questions/1021102/parsing-xml-in-iphone XML in iPhone closed hi I am new to iphone development. I need to parse simple XML coming from my webserver and store this in database. Is there any sample code for doing the same iphone xml parsing share improve this question Please have a look at Touch XML a Objective C framework for reading and writing XML...
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present textfields without being hidden by the keyboard the standard way is to move up down the view having textfields whenever the keyboard is shown. Here is some sample code #define kOFFSET_FOR_KEYBOARD 80.0 void keyboardWillShow Animate the current view out of the way if self.view.frame.origin.y 0 self setViewMovedUp YES else..
http://stackoverflow.com/questions/1388467/reading-epub-format iPhone application to read ePub files. Is there any framework available to develop this I have no idea about how to read this file format. I tried to parse a sample file with .epub extension using NSXML Parser but that fails. iphone epub share improve this question The EPUB format brings together a bunch of different specifications..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone part but is there a way to convert the UIImage data into a bitmap representation in which I could extract this information for a given pixel A working code sample would be most appreciated and note that I am not concerned with the alpha value. iphone cocoa touch image bitmap share improve this question A little more..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview be dequeued instead. It feels very dirty. There must be a better way. iphone uitableview uitableviewcell share improve this question In Apple's Accessory sample the following method is used button addTarget self action @selector checkButtonTapped forControlEvents UIControlEventTouchUpInside Then in touch handler touch coordinate..
iPhone ivar naming convention [duplicate] http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention like to use it for clarity to separate out class variables and as another responder noted to avoid conflict with incoming parameter names. Even in Apple sample code the use is mixed. However I greatly prefer to not use the _ prefix and have two strong reasons 1 Some people think the _ is a good indicator of private . My..
JSON and Core Data on the iPhone http://stackoverflow.com/questions/2362323/json-and-core-data-on-the-iphone 2 convert the JSON string back into core data objects again preserving the relationship between entities . I have searched unsuccessfully for a tutorial code sample on this point so any assistance would be gratefully received. iphone objective c json core data share improve this question First pick a JSON library to use..
http://stackoverflow.com/questions/2371489/why-do-you-use-an-underscore-for-an-instance-variable-but-not-its-corresponding a variable in a cocoa objective c class work I am new to iphone development.I am doing research on voice recording in iphone .I have downloaded the speak here sample program from Apple.It consist of LevelMeter.h file in which @interface LevelMeter UIView CGFloat _level _peakLevel The property are set as @property CGFloat level..
http://stackoverflow.com/questions/3339722/check-iphone-ios-version and UIDevice provide methods to check device capabilities if CLLocationManager headingAvailable Do something Apple uses systemVersion in their GLSprite sample code so my recommendation can't be absolute A system version of 3.1 or greater is required to use CADisplayLink. The NSTimer class is used as fallback when it isn't..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework the apple FFT and accelerate Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how to implement it into an actual project. iphone audio.. Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how to implement it into an actual project. iphone audio fft share improve this question I just got the FFT code working.. gets in 1024 floats. Supposing the microphone sampling rate was 44.1kHz so that's ~44 frames sec. So our time window is whatever the time duration of 1024 samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal and vDSP_fft_zrip setupReal A stride..
http://stackoverflow.com/questions/37464/iphone-app-minus-app-store on iPhone 2.0 article Jailbroken iPhone For jailbroken iPhones you can use the following method which I have personally tested using the AccelerometerGraph sample app on iPhone OS 3.0. Create Self Signed Certificate First you'll need to create a self signed certificate and patch your iPhone SDK to allow the use of this certificate..
iphone/ipad: How exactly use NSAttributedString? http://stackoverflow.com/questions/3786528/iphone-ipad-how-exactly-use-nsattributedstring that draws an NSAttributedString and also provides convenience methods for setting the attributes of an NSAttributedString from UIKit classes. From the sample provided in the repo #import NSAttributedString Attributes.h #import OHAttributedLabel.h 1 Build the NSAttributedString NSMutableAttributedString attrStr NSMutableAttributedString..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints give the performance and functionality that you would expect from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage Method PDF's in a UIImage don't optically scale as well..
How do I do base64 encoding on iphone-sdk? http://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers and the frameworks. One of the resources I'm using is Stanford's CS193P class notes that they have left on the web. It includes lecture notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth . Class Website http www.stanford.edu class cs193p cgi..
iPhone UIView Animation Best Practice http://stackoverflow.com/questions/630265/iphone-uiview-animation-best-practice UIView Animation Best Practice What is considered best practice for animating view transitions on the iPhone For example the ViewTransitions sample project from apple uses code like CATransition applicationLoadViewIn CATransition animation applicationLoadViewIn setDuration 1 applicationLoadViewIn setType kCATransitionReveal..
Has anyone implemented the PayPal API through a native iPhone app? http://stackoverflow.com/questions/779423/has-anyone-implemented-the-paypal-api-through-a-native-iphone-app site and let them complete the transaction there otherwise the user would need to use their API key. Does this sound right and has anyone got or seen any sample code I have to think this is a common piece of code. UPDATE Will Apple allow this It is a charity app so I am assuming there is no issue. Re UPDATE I assumed wrong...
Is there a barcode recognition framework for iOS? http://stackoverflow.com/questions/838724/is-there-a-barcode-recognition-framework-for-ios there a barcode recognition framework for iOS Is there a framework or other sample code for doing barcode recognition on iPhone iPad iphone ios cocoa touch barcode share improve this question Yes we produced the 'Barcodes' application for..
How do I record audio on iPhone with AVAudioRecorder? http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder iPhone Dev Center and only reference to the classes. I am a newbie at iPhone development so I am looking for a simple sample to get me started. Thanks in advance. iphone audio recording share improve this question Actually there are no examples.. working code. Recording is triggered by the user pressing a button on the navBar. The recording uses cd quality 44100 samples stereo 2 channels linear pcm. Beware if you want to use a different format especially an encoded one make sure you fully..
Parsing XML in iPhone [closed] http://stackoverflow.com/questions/1021102/parsing-xml-in-iphone to iphone development. I need to parse simple XML coming from my webserver and store this in database. Is there any sample code for doing the same iphone xml parsing share improve this question Please have a look at Touch XML a Objective..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present keyboard the standard way is to move up down the view having textfields whenever the keyboard is shown. Here is some sample code #define kOFFSET_FOR_KEYBOARD 80.0 void keyboardWillShow Animate the current view out of the way if self.view.frame.origin.y..
http://stackoverflow.com/questions/1388467/reading-epub-format Is there any framework available to develop this I have no idea about how to read this file format. I tried to parse a sample file with .epub extension using NSXML Parser but that fails. iphone epub share improve this question The EPUB format..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone UIImage data into a bitmap representation in which I could extract this information for a given pixel A working code sample would be most appreciated and note that I am not concerned with the alpha value. iphone cocoa touch image bitmap share..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview There must be a better way. iphone uitableview uitableviewcell share improve this question In Apple's Accessory sample the following method is used button addTarget self action @selector checkButtonTapped forControlEvents UIControlEventTouchUpInside..
iPhone ivar naming convention [duplicate] http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention out class variables and as another responder noted to avoid conflict with incoming parameter names. Even in Apple sample code the use is mixed. However I greatly prefer to not use the _ prefix and have two strong reasons 1 Some people think..
JSON and Core Data on the iPhone http://stackoverflow.com/questions/2362323/json-and-core-data-on-the-iphone data objects again preserving the relationship between entities . I have searched unsuccessfully for a tutorial code sample on this point so any assistance would be gratefully received. iphone objective c json core data share improve this question..
http://stackoverflow.com/questions/2371489/why-do-you-use-an-underscore-for-an-instance-variable-but-not-its-corresponding work I am new to iphone development.I am doing research on voice recording in iphone .I have downloaded the speak here sample program from Apple.It consist of LevelMeter.h file in which @interface LevelMeter UIView CGFloat _level _peakLevel The..
http://stackoverflow.com/questions/3339722/check-iphone-ios-version device capabilities if CLLocationManager headingAvailable Do something Apple uses systemVersion in their GLSprite sample code so my recommendation can't be absolute A system version of 3.1 or greater is required to use CADisplayLink. The NSTimer..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework apple FFT and accelerate Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how to implement it.. for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how to implement it into an actual project. iphone audio fft share improve this question.. sampling rate was 44.1kHz so that's ~44 frames sec. So our time window is whatever the time duration of 1024 samples is ie 1 44 s. So we would pack A with 1024 floats from the mic set log2n 10 2^10 1024 precalculate some bobbins setupReal..
http://stackoverflow.com/questions/37464/iphone-app-minus-app-store For jailbroken iPhones you can use the following method which I have personally tested using the AccelerometerGraph sample app on iPhone OS 3.0. Create Self Signed Certificate First you'll need to create a self signed certificate and patch your..
iphone/ipad: How exactly use NSAttributedString? http://stackoverflow.com/questions/3786528/iphone-ipad-how-exactly-use-nsattributedstring and also provides convenience methods for setting the attributes of an NSAttributedString from UIKit classes. From the sample provided in the repo #import NSAttributedString Attributes.h #import OHAttributedLabel.h 1 Build the NSAttributedString..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints that you would expect from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage Method PDF's..
How do I do base64 encoding on iphone-sdk? http://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers I'm using is Stanford's CS193P class notes that they have left on the web. It includes lecture notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth . Class Website..
iPhone UIView Animation Best Practice http://stackoverflow.com/questions/630265/iphone-uiview-animation-best-practice What is considered best practice for animating view transitions on the iPhone For example the ViewTransitions sample project from apple uses code like CATransition applicationLoadViewIn CATransition animation applicationLoadViewIn setDuration..
Has anyone implemented the PayPal API through a native iPhone app? http://stackoverflow.com/questions/779423/has-anyone-implemented-the-paypal-api-through-a-native-iphone-app there otherwise the user would need to use their API key. Does this sound right and has anyone got or seen any sample code I have to think this is a common piece of code. UPDATE Will Apple allow this It is a charity app so I am assuming there..
Is there a barcode recognition framework for iOS? http://stackoverflow.com/questions/838724/is-there-a-barcode-recognition-framework-for-ios there a barcode recognition framework for iOS Is there a framework or other sample code for doing barcode recognition on iPhone iPad iphone ios cocoa touch barcode share improve this question Yes we..
iPhone: How to draw line between two points on MapKit? http://stackoverflow.com/questions/10598322/iphone-how-to-draw-line-between-two-points-on-mapkit route in mkmapview 1 Draw route using mapkit 2 From versions above ios4.0 You can use MKOverlayPathView See Apple Docs Sample code create PolyLine void loadRoute NSString filePath NSBundle mainBundle pathForResource @ 𩼣oute ofType @ 𩓧sv 㷷 NSString..
ios iphone get device model and make? http://stackoverflow.com/questions/11197509/ios-iphone-get-device-model-and-make share improve this question EITHER try this library http github.com erica uidevice extension by Erica Sadun . Sample Code UIDevice currentDevice platformType ex UIDevice4GiPhone UIDevice currentDevice platformString ex @ iPhone 4G OR You..
http://stackoverflow.com/questions/11323326/xml-parsing-in-ios-tutorial
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an even need the NSTimeInterval just apply the dates to the NSCalendar method . Get your quotes from NSDateComponents Sample Code The time interval NSTimeInterval theTimeInterval ... Get the system calendar NSCalendar sysCalendar NSCalendar currentCalendar..
Interface orientation in iOS 6.0 http://stackoverflow.com/questions/12404556/interface-orientation-in-ios-6-0 UIInterfaceOrientation preferredInterfaceOrientationForPresentation return UIInterfaceOrientationMaskPortrait #edit 2 Sample code from landscape only application which supports iOS 5 and iOS 6 BOOL shouldAutorotateToInterfaceOrientation UIInterfaceOrientation..
UISearchBar Sample Code [closed] http://stackoverflow.com/questions/1302962/uisearchbar-sample-code Sample Code closed Implementing a searchbar can be tricky business and I'm struggling to make it work for my situation. Here's..
iPhone Pull Down Refresh like Tweetie http://stackoverflow.com/questions/1634739/iphone-pull-down-refresh-like-tweetie region. How would I do this An example would be what the Tweetie 2 app for the iPhone does to refresh tweets. Sample code would be extremely helpful. iphone uitableview pull to refresh share improve this question I did find the answer..
UITextField: move view when keyboard appears http://stackoverflow.com/questions/1775860/uitextfield-move-view-when-keyboard-appears nil @end KBKeyboardHandlerDelegate.h @protocol KBKeyboardHandlerDelegate void keyboardSizeChanged CGSize delta @end Sample MyViewController.h @interface MyViewController UIViewController KBKeyboardHandlerDelegate ... @end Sample MyViewController.m.. delta @end Sample MyViewController.h @interface MyViewController UIViewController KBKeyboardHandlerDelegate ... @end Sample MyViewController.m @implementation MyViewController KBKeyboardHandler keyboard void dealloc keyboard.delegate nil keyboard..
How to add a button to UINavigationBar? http://stackoverflow.com/questions/2504351/how-to-add-a-button-to-uinavigationbar to UINavigationBar programmatically iphone xcode interface builder uinavigationbar share improve this question Sample code to set the right button on a navigation bar. UIBarButtonItem rightButton UIBarButtonItem alloc initWithTitle @ Done..
http://stackoverflow.com/questions/4238760/how-to-make-a-uitableviewcell-with-a-uitextview-inside-that-dynamically-adjust This is the code by which you can calculate the size of string.... First get the size of String NSString label @ Sample String to get the Size for the textView Will definitely work CGSize stringSize label sizeWithFont UIFont boldSystemFontOfSize..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader ways I can cut it I can make some precessing with this but... I really don't understand what I gonna do with this CMSampleBufferRef to get data for drawing waveform I need info about peak values how I can get it this maybe another way AVAssetTrack.. AVAssetReaderTrackOutput trackOutput AVAssetReaderTrackOutput reader.outputs objectAtIndex 0 CMSampleBufferRef sampleBufferRef trackOutput copyNextSampleBuffer if sampleBufferRef what I gonna do with this Please help me iphone.. AVAssetReaderTrackOutput reader.outputs objectAtIndex 0 CMSampleBufferRef sampleBufferRef trackOutput copyNextSampleBuffer if sampleBufferRef what I gonna do with this Please help me iphone objective c core audio ipod waveform share improve..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating you're done call performSelectorOnMainThread which calls a selector to update your UI. performSelectorInBackground Sample In this snippet I have a button which invokes the long running work a status label and I added a slider to show I can move.. nil waitUntilDone YES void workDone id obj self feedbackLabel setText @ Done ... self doWorkButton setEnabled YES GCD Sample on click of button IBAction doWork id sender self feedbackLabel setText @ Working ... self doWorkButton setEnabled NO async..
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