2014/10/15 下午 10:06:59

iphone Programming Glossary: dispatch_get_main_queue

How to check for an active Internet Connection on iPhone SDK?

http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk

is reachable internetReachableFoo.reachableBlock ^ Reachability reach Update the UI on the main thread dispatch_async dispatch_get_main_queue ^ NSLog @ Yayyy we have the interwebs Internet is not reachable internetReachableFoo.unreachableBlock ^ Reachability reach.. reachable internetReachableFoo.unreachableBlock ^ Reachability reach Update the UI on the main thread dispatch_async dispatch_get_main_queue ^ NSLog @ Someone broke the internet internetReachableFoo startNotifier METHOD 2 Do it yourself the old way using Apple's..

Upload live streaming video from iPhone like Ustream or Qik

http://stackoverflow.com/questions/1960782/upload-live-streaming-video-from-iphone-like-ustream-or-qik

outputDevice AVCaptureVideoDataOutput alloc init outputDevice setSampleBufferDelegate self queue dispatch_get_main_queue initialize capture session AVCaptureSession captureSession AVCaptureSession alloc init autorelease captureSession addInput..

How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?

http://stackoverflow.com/questions/4139219/how-do-you-trigger-a-block-after-a-delay-like-performselectorwithobjectafter

wait_fences: failed to receive reply: 10004003 error - UIAlert WITHOUT UITextField present

http://stackoverflow.com/questions/4241894/wait-fences-failed-to-receive-reply-10004003-error-uialert-without-uitextfie

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

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 some work part of the above could..

NSURLConnection and grand central dispatch

http://stackoverflow.com/questions/5037545/nsurlconnection-and-grand-central-dispatch

Uploading live streaming video from iPhone [duplicate]

http://stackoverflow.com/questions/5062266/uploading-live-streaming-video-from-iphone

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

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 0 dispatch_async concurrentQueue..

Grand Central Dispatch (GCD) vs. performSelector - need a better explanation

http://stackoverflow.com/questions/5225130/grand-central-dispatch-gcd-vs-performselector-need-a-better-explanation

is an Obj C wrapper to the GCD C syntax. I've been thinking of these two commands as equivalent dispatch_sync dispatch_get_main_queue ^ self doit YES self performSelectorOnMainThread @selector doit withObject YES waitUntilDone YES Am I incorrect That is..

Can you use cancel/isCancelled with GCD/dispatch_async?

http://stackoverflow.com/questions/5449469/can-you-use-cancel-iscancelled-with-gcd-dispatch-async

that this does not work if you use the main Q rather than a global Q as shown. Thus this would not work dispatch_async dispatch_get_main_queue ^ ... void actuallyProcedurallyBuildInBackground we are actually in the BG here... self setUpHere set up any variables contexts.. else it will sit there for about 4 to 6 seconds on 4.3 4.2 doing nothing until it realises you are done dispatch_sync dispatch_get_main_queue ^ self attentionBGIsAllDone would setneedsdisplay etc return void buildGuts we are actually in the BG here... Don't open.. blah blah CHECKER self blah blah to get stuff done from time to time on the UI something like... CHECKER dispatch_sync dispatch_get_main_queue ^ supportStuff pleasePostMidwayImage UIImage imageWithCGImage halfOfShip CHECKER self blah blah CHECKER self blah blah..

GCD, Threads, Program Flow and UI Updating

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

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 so check other children by recursion... 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 queue within that call to update UI on main thread. dispatch_async queue ^ self performLongRunningWork..

Objective-C: Asynchronously populate UITableView - how to do this?

http://stackoverflow.com/questions/7491517/objective-c-asynchronously-populate-uitableview-how-to-do-this

Note We MIGHT be on a background thread here. if NSThread isMainThread self tableView reloadData else dispatch_sync dispatch_get_main_queue ^ self tableView reloadData And done. A few more lines of code for you to write but it replaces 13K lines of code that..

loading images from a background thread using blocks

http://stackoverflow.com/questions/7502073/loading-images-from-a-background-thread-using-blocks

Last In-First Out Stack with GCD?

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

visibleCells containsObject theCell put the image into the cell's imageView on the main queue dispatch_async dispatch_get_main_queue ^ theCell imageView setImage contact.image theCell setNeedsLayout return cell The WWDC2010 conference video Introducing.. queue to get it working as soon as the main queue comes online . A trick mentioned by Apple at WWDC dispatch_async dispatch_get_main_queue ^ dispatch to background priority queue as soon as we get onto the main queue so as not to block the main queue and therefore..

Core Data's NSPrivateQueueConcurrencyType and sharing objects between threads

http://stackoverflow.com/questions/8637921/core-datas-nsprivatequeueconcurrencytype-and-sharing-objects-between-threads

context performBlock ^ fetch request code NSArray results context executeFetchRequest request error nil dispatch_async dispatch_get_main_queue ^ void Class firstObject results objectAtIndex 0 do something with firstObject still unacceptable since I'm sharing my..