¡@
2014/10/15 ¤U¤È 10:06:59
iphone Programming Glossary: dispatch_asyncHow 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 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.. 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..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events bgTask bgTask UIBackgroundTaskInvalid Start the long running task and return immediately. dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ you can do sth. here or simply do nothing.. ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ while 1 NSLog @ BGTime left f UIApplication.. ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ while 1 NSLog @ BGTime left f UIApplication..
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 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.. 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 be a lengthy calculation or an..
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour like the following if dispatch_semaphore_wait frameRenderingSemaphore DISPATCH_TIME_NOW 0 return dispatch_async openGLESContextQueue ^ EAGLContext setCurrentContext context Render here dispatch_semaphore_signal frameRenderingSemaphore..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating solutionNode newChild minMoves newChild.numberOfMoves Update UI on main Thread dispatch_async main_queue ^ minMovesLabel.stringValue NSString stringWithFormat @ d minMoves numSolutionsLabel.stringValue.. do the long running work in bg async queue within that call to update UI on main thread. dispatch_async queue ^ self performLongRunningWork dispatch_async main ^ self workDone void performLongRunningWork.. that call to update UI on main thread. dispatch_async queue ^ self performLongRunningWork dispatch_async main ^ self workDone void performLongRunningWork simulate 5 seconds of work I added a slider to the..
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 reachabilityWithHostname @ www.google.com Internet 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 Update the.. ^ NSLog @ Yayyy we have the interwebs Internet is not 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 outdated Reachability..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events beginBackgroundTaskWithExpirationHandler ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task and return immediately. dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ you can do sth. here or simply do nothing All your background treads and timers are still being executed.. bgTask app beginBackgroundTaskWithExpirationHandler ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ while 1 NSLog @ BGTime left f UIApplication sharedApplication .backgroundTimeRemaining self doSomething.. bgTask app beginBackgroundTaskWithExpirationHandler ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ while 1 NSLog @ BGTime left f UIApplication sharedApplication .backgroundTimeRemaining self doSomething..
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 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 some work part of the above could be a lengthy calculation or an operation that loops over.. 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 be a lengthy calculation or an operation that loops over multiple values. In this example the..
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour Then within your CADisplayLink callback you can use code like the following if dispatch_semaphore_wait frameRenderingSemaphore DISPATCH_TIME_NOW 0 return dispatch_async openGLESContextQueue ^ EAGLContext setCurrentContext context Render here dispatch_semaphore_signal frameRenderingSemaphore where frameRenderingSemaphore is created..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating maxMoves newChild.numberOfMoves if minMoves 1 minMoves newChild.numberOfMoves solutionNode newChild minMoves newChild.numberOfMoves Update UI on main Thread dispatch_async main_queue ^ minMovesLabel.stringValue NSString stringWithFormat @ d minMoves numSolutionsLabel.stringValue NSString stringWithFormat @ d numSolutions maxMovesLabel.stringValue.. 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 dispatch_async main ^ self workDone void performLongRunningWork simulate 5 seconds of work I added a slider to the form.. do the long running work in bg async queue within that call to update UI on main thread. dispatch_async queue ^ self performLongRunningWork dispatch_async main ^ self workDone void performLongRunningWork simulate 5 seconds of work I added a slider to the form I can slide it back and forth during the 5 sec. sleep..
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 Internet 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.. Internet is not 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..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task and return immediately. dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ you can do sth. here or simply do nothing All your background.. ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ while 1 NSLog @ BGTime left f UIApplication sharedApplication.. ^ app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Start the long running task dispatch_async dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 ^ while 1 NSLog @ BGTime left f UIApplication sharedApplication..
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 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 be a lengthy calculation.. 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 be a lengthy calculation or an operation that loops..
How to apply “filters” to AVCaptureVideoPreviewLayer http://stackoverflow.com/questions/5156872/how-to-apply-filters-to-avcapturevideopreviewlayer
iPhone:Programmatically compressing recorded video to share? http://stackoverflow.com/questions/5687341/iphoneprogrammatically-compressing-recorded-video-to-share NSString videoURL dispatch_queue_t mainQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 dispatch_async mainQueue ^ ALAssetsLibrary library ALAssetsLibrary alloc init autorelease ALAssetsLibraryWriteVideoCompletionBlock completionBlock..
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour you can use code like the following if dispatch_semaphore_wait frameRenderingSemaphore DISPATCH_TIME_NOW 0 return dispatch_async openGLESContextQueue ^ EAGLContext setCurrentContext context Render here dispatch_semaphore_signal frameRenderingSemaphore..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating 1 minMoves newChild.numberOfMoves solutionNode newChild minMoves newChild.numberOfMoves Update UI on main Thread dispatch_async main_queue ^ minMovesLabel.stringValue NSString stringWithFormat @ d minMoves numSolutionsLabel.stringValue NSString stringWithFormat.. 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 dispatch_async main ^ self workDone void performLongRunningWork simulate 5 seconds.. in bg async queue within that call to update UI on main thread. dispatch_async queue ^ self performLongRunningWork dispatch_async main ^ self workDone void performLongRunningWork simulate 5 seconds of work I added a slider to the form I can slide it..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd check to see if your contact's image is nil or has been cached. If the image is nil or not in cache use a nested dispatch_async to load the image from the database and update the tableView cell. UITableViewCell tableView UITableView tableView cellForRowAtIndexPath.. reuseIdentifier CellIdentifier If the contact object's image has not been loaded Use a place holder image then use dispatch_async on a background queue to retrieve it. if contact.image nil cell imageView setImage contact.image else Set a temporary.. 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 image use an index path to get at the cell we want to use because the..
|