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2014/10/15 ¤U¤È 10:13:05
iphone Programming Glossary: queuesWhat is the basic difference between NSTimer, NSTask, NSThread and NSRunloop? http://stackoverflow.com/questions/1124207/what-is-the-basic-difference-between-nstimer-nstask-nsthread-and-nsrunloop be using NSTasks. NSOperations are used when you need to handle a larger amount of different tasks placing them in queues and or processing them in separate threads although they don't have to run in separate threads . If your application needs..
NSBlockOperation or NSOperation with ALAsset Block to display photo-library images using ALAsset URL http://stackoverflow.com/questions/11580918/nsblockoperation-or-nsoperation-with-alasset-block-to-display-photo-library-imag to the issue I have researched detailed about my above mentioned issue and I have found the document about operation queues from here . So I have created one sample application to display seven photo library images using operation queues through.. queues from here . So I have created one sample application to display seven photo library images using operation queues through ALAsset blocks. Here are the sample application details. Step 1 In the NSOperationalQueueViewController viewDidLoad..
NSManagedObjectContext performBlockAndWait: doesn't execute on background thread? http://stackoverflow.com/questions/11831946/nsmanagedobjectcontext-performblockandwait-doesnt-execute-on-background-thread is not a good forum for this because it's a bit more complex than that especially w.r.t the main queue and GCD global queues but the latter is not important for Core Data. The main point is that when you call any performBlock or GCD function you.. GCD function you should not expect it to run on any particular thread except something tied to the main thread because queues are not threads and only the main queue will run blocks on a specific thread. When calling the core data performBlockAndWait..
Common multithreading mistakes beginners make on iPhone http://stackoverflow.com/questions/1357108/common-multithreading-mistakes-beginners-make-on-iphone I also highly recommend reading the new Concurrency Programming Guide however ignore the blocks and dispatch queues as Grand Central Dispatch is not yet available on iPhone OS iOS 4.0 just added blocks and GCD because it makes a strong..
Do you need to create an NSAutoreleasePool within a block in GCD? http://stackoverflow.com/questions/4141123/do-you-need-to-create-an-nsautoreleasepool-within-a-block-in-gcd of your block ™s code in an @autorelease block to handle the memory management for those objects. Although GCD dispatch queues have their own autorelease pools they make no guarantees as to when those pools are drained. If your application is memory..
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 a continuous progress bar. This sample application I created for my class illustrates how to use both NSOperations and queues for performing background work and then updating the UI when done. Also my Molecules application uses background threads..
Concurrency and serial queues in Grand Central Dispatch http://stackoverflow.com/questions/5026043/concurrency-and-serial-queues-in-grand-central-dispatch and serial queues in Grand Central Dispatch OK I love Grand Central Dispatch and after using it with relative success but this is something..
Access to iPhone music library http://stackoverflow.com/questions/625625/access-to-iphone-music-library items from the user ™s library. This support lets you play all audio types supported by the iPod application. Construct queues of audio items to play back. Perform searches of the user ™s audio library. Access the user ™s playlists including smart on..
What major ASIHTTPRequest features is AFNetworking missing? http://stackoverflow.com/questions/7529258/what-major-asihttprequest-features-is-afnetworking-missing views with asynchronous image downloading and cell filling pretty easily whereas in ASI you had to make operation queues for bandwidth throttling and mind yourself to cancel and resume the operation queue according to table view visibility and..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd
Filling a portion of an image with color http://stackoverflow.com/questions/8124308/filling-a-portion-of-an-image-with-color
iOS Stream Audio from one iOS Device to Another http://stackoverflow.com/questions/8357514/ios-stream-audio-from-one-ios-device-to-another or in the case of wrong sample rates audio that sounds slowed down or sped up. Note that SpeakHere runs two audio queues one for recording and one for playback. All audio stuff works using buffers of data. So you're always passing round pointers..
Core Data's NSPrivateQueueConcurrencyType and sharing objects between threads http://stackoverflow.com/questions/8637921/core-datas-nsprivatequeueconcurrencytype-and-sharing-objects-between-threads performBlock One of the rules of thumb of Core Data has been that you can not share a managed object between threads queues. Is it still the case with performBlock Is the following context performBlock ^ fetch request code NSArray results context..
What's the difference between the “global queue” and the “main queue” in GCD? http://stackoverflow.com/questions/9602042/whats-the-difference-between-the-global-queue-and-the-main-queue-in-gcd global queue&rdquo and the &ldquo main queue&rdquo in GCD Among some other ways there are these two ways to get queues in GCD dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 dispatch_get_main_queue If I'm not completely wrong the.. dispatch share improve this question The main queue does indeed run on the main thread like you say. The global queues are concurrent queues and from the main page for dispatch_get_global_queue Unlike the main queue or queues allocated with.. this question The main queue does indeed run on the main thread like you say. The global queues are concurrent queues and from the main page for dispatch_get_global_queue Unlike the main queue or queues allocated with dispatch_queue_create..
http://stackoverflow.com/questions/2393124/set-device-volume-on-iphone Clock apps out there somehow are able to do this so there must be a way. I believe that this can be done using Audio Queues using the call AudioQueueSetParameter aq kAudioQueueParam_Volume 1.0 But my code needs to use the AVAudioPlayer to play..
AVAssetWritter does not work with audio http://stackoverflow.com/questions/5200077/avassetwritter-does-not-work-with-audio case AVAssetWriterStatusCompleted return case AVAssetWriterStatusFailed self delegateMessage @ Critical Error Writing Queues withType ERROR bufferWriter writer_failed YES _broadcastError YES self stopCapture return case AVAssetWriterStatusCancelled..
Is there a way to record device audio on the iPhone? http://stackoverflow.com/questions/5670326/is-there-a-way-to-record-device-audio-on-the-iphone
What exactly is GCD and where should it be used? http://stackoverflow.com/questions/6539656/what-exactly-is-gcd-and-where-should-it-be-used grand central dispatch share improve this question I strongly suggest you to read the chapter called Dispatch Queues in Apple's Concurrency Programming Guide. It is an excellent document and clearly depicts the differences with standard..
Combining two .caf files on iPhone http://stackoverflow.com/questions/7656512/combining-two-caf-files-on-iphone email. Does anyone have any clue as to how this can be done This answer suggests using something called Audio Service Queues but I don't know anything about that iphone objective c avfoundation share improve this question It's not quite as..
http://stackoverflow.com/questions/8485032/record-audio-to-nsdata data recorded during that second. iphone nsdata record microphone voice share improve this question Both Audio Queues and the RemoteIO Audio Unit will give you buffers of raw audio in real time with fairly low latency. You can take the buffer..
AVCaptureSession only got video buffer http://stackoverflow.com/questions/9257052/avcapturesession-only-got-video-buffer break case AVAssetWriterStatusCompleted return case AVAssetWriterStatusFailed NSLog @ Critical Error Writing Queues bufferWriter writer_failed YES _broadcastError YES return case AVAssetWriterStatusCancelled break default break iphone..
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