2014/10/15 下午 10:07:01

iphone Programming Glossary: dispatch_queue_t

UIStringDrawing methods don't seem to be thread safe in iOS 6

http://stackoverflow.com/questions/12744558/uistringdrawing-methods-dont-seem-to-be-thread-safe-in-ios-6

UIStringDrawing methods were thread safe from iOS 4.0. This code that does nothing of any use demonstrates the problem dispatch_queue_t queue dispatch_queue_create com.queue NULL for int i 0 i 10000 i dispatch_async queue ^ NSString string @ My string CGSize.. by serialising any draw calls using CGD void serialiseDrawing void ^ block dispatch_sync self.serialDrawingQueue block dispatch_queue_t serialDrawingQueue if _serialDrawingQueue NULL _serialDrawingQueue dispatch_queue_create com.myApp.SerialDrawQueue NULL..

This code to write video+audio through AVAssetWriter and AVAssetWriterInputs is not working. Why?

http://stackoverflow.com/questions/4149963/this-code-to-write-videoaudio-through-avassetwriter-and-avassetwriterinputs-is

_videoOutput _capSession addOutput _audioOutput _capSession.sessionPreset AVCaptureSessionPresetLow Setup the queue dispatch_queue_t queue dispatch_queue_create MyQueue NULL _videoOutput setSampleBufferDelegate self queue queue _audioOutput setSampleBufferDelegate..

Grand Central Dispatch (GCD) with CoreData

http://stackoverflow.com/questions/4264540/grand-central-dispatch-gcd-with-coredata

lifting. The application is using Core Data for data storage purposes. Here's my scenario along with relevant question dispatch_queue_t main_queue dispatch_get_main_queue dispatch_queue_t request_queue dispatch_queue_create com.app.request NULL dispatch_async.. storage purposes. Here's my scenario along with relevant question dispatch_queue_t main_queue dispatch_get_main_queue dispatch_queue_t request_queue dispatch_queue_create com.app.request NULL dispatch_async request_queue ^ MyNSManagedObject mObject self.fetchedResultsController.. is when you save the UI update takes place. You can solve this by nesting a call to dispatch_sync on the main thread. dispatch_queue_t main_queue dispatch_get_main_queue dispatch_queue_t request_queue dispatch_queue_create com.app.request NULL __block __typeof__..

Is there a way to make drawRect work right NOW?

http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now

the easiest way to do this under Snow Leopard and iOS 4.0 is to use blocks like in the following rudimentary sample dispatch_queue_t main_queue dispatch_get_main_queue dispatch_async queue ^ Do some work dispatch_async main_queue ^ Update the UI The Do..

How to make ui responsive all the time and do background updating?

http://stackoverflow.com/questions/5133731/how-to-make-ui-responsive-all-the-time-and-do-background-updating

is not thread safe UIImage imageNamed is not thread safe but UIImage imageWithContentsOfFile is thread safe. dispatch_queue_t mainQueue dispatch_get_main_queue dispatch_queue_t concurrentQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT.. not thread safe but UIImage imageWithContentsOfFile is thread safe. dispatch_queue_t mainQueue dispatch_get_main_queue dispatch_queue_t concurrentQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 dispatch_async concurrentQueue ^ dispatch_apply..

iPhone:Programmatically compressing recorded video to share?

http://stackoverflow.com/questions/5687341/iphoneprogrammatically-compressing-recorded-video-to-share

self dismissModalViewControllerAnimated YES void copyTempVideoToMediaLibrary NSString videoURL dispatch_queue_t mainQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 dispatch_async mainQueue ^ ALAssetsLibrary library..

Make movie file with picture Array and song file, using AVAsset

http://stackoverflow.com/questions/6061092/make-movie-file-with-picture-array-and-song-file-using-avasset

I want copy audio in the file and I do this audioReader startReading videoWriter startSessionAtSourceTime kCMTimeZero dispatch_queue_t mediaInputQueue dispatch_queue_create mediaInputQueue NULL audioWriterInput requestMediaDataWhenReadyOnQueue mediaInputQueue..

GCD, Threads, Program Flow and UI Updating

http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating

@selector createTreeFromNode withObject rootNode I've tried to use GCD but similar issue and can't get UI updated. dispatch_queue_t queue dispatch_queue_create com.gamesbychris.createTree 0 dispatch_sync queue ^ self createTreeFromNode rootNode Need to.. @ Solve Puzzle Needs to run in background so UI can be updated void createTreeFromNode TreeNode node Tried using GCD dispatch_queue_t main_queue dispatch_get_main_queue ...Create Tree Node and find Children Code... if solutionFound Solution not found yet.. @ Working ... self doWorkButton setEnabled NO async queue for bg work main queue for updating ui on main thread dispatch_queue_t queue dispatch_queue_create com.sample 0 dispatch_queue_t main dispatch_get_main_queue do the long running work in bg async..

Core Data and threads / Grand Central Dispatch

http://stackoverflow.com/questions/7540801/core-data-and-threads-grand-central-dispatch

NSPersistentStoreCoordinator mainThreadContextStoreCoordinator self.mainThreadContext persistentStoreCoordinator dispatch_queue_t request_queue dispatch_queue_create com.yourapp.DescriptionOfMethod NULL dispatch_async request_queue ^ Create a new managed..

Load image to a tableView from URL iphone sdk

http://stackoverflow.com/questions/7565123/load-image-to-a-tableview-from-url-iphone-sdk

share improve this question You can use GCD to load images in background thread like this get a dispatch queue dispatch_queue_t concurrentQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 this will start the image loading in bg dispatch_async..

Last In-First Out Stack with GCD?

http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd

placeholder cell imageView setImage placeHolderImage Retrieve the image from the database on a background queue dispatch_queue_t queue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_HIGH 0 dispatch_async queue ^ UIImage image render image contact.image.. background priority queue as soon as we get onto the main queue so as not to block the main queue and therefore the UI dispatch_queue_t lowPriorityQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_BACKGROUND 0 dispatch_apply contactsCount lowPriorityQueue..