2014/10/15 下午 10:07:34

iphone Programming Glossary: drained

NSManagedObjectContext performBlockAndWait: doesn't execute on background thread?

http://stackoverflow.com/questions/11831946/nsmanagedobjectcontext-performblockandwait-doesnt-execute-on-background-thread

return after this code has completely executed which will occur after the current queue associated with this MOC has drained . EDIT Are you sure of performBlockAndWait does NOT use the internal queue I think it does. The only difference is that..

iPhone GPS in background never resumes after pause

http://stackoverflow.com/questions/17484352/iphone-gps-in-background-never-resumes-after-pause

that they have got a location aware app running and have stopped using it. By pausing updates their battery won't be drained as quickly. Unfortunately it's not possible to know whether new movement is them resuming the activity or doing something..

To Autorelease or Not to Autorelease

http://stackoverflow.com/questions/2165619/to-autorelease-or-not-to-autorelease

basically saying I don't need this any longer but anyone else is free to pick it up before the auto release pool is drained . When you explicitly relase an object you're saying I don't need this any longer and unless anyone else has already said..

When is an autoreleased object actually released?

http://stackoverflow.com/questions/2498330/when-is-an-autoreleased-object-actually-released

object is added to that outter pool in the run loop. When the current event is finished being dispatched the pool is drained and those objects are finally sent release messages. One last note. There can be more than one autorelease pool that aren't..

When is the autorelease pool triggered

http://stackoverflow.com/questions/3439884/when-is-the-autorelease-pool-triggered

my app and would like to understand the behavior of the autorelease method. When is the default autorelease pool drained is it based on a timer every 30sec or have to be called manually do I need to do anything to release variables that are..

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

will manage an autorelease pool per queue automatically. However there are no guarantees as to when the pool will be drained it may be after one block is processed it may be after hundreds but probably won't be . So if you are only allocating a.. 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 constrained creating your own autorelease pool allows you to free up the memory for autoreleased..

Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init]

http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init

control. The problem here is that autoreleased objects live in the autorelease pool and can pile up until the pool is drained whenever that may be. Another thing to watch out for is loops. You may generate autoreleased objects without being aware..

How would you keep secret data secret in an iPhone application?

http://stackoverflow.com/questions/544463/how-would-you-keep-secret-data-secret-in-an-iphone-application

End of run loop — autorelease pool recovery

http://stackoverflow.com/questions/5766839/end-of-run-loop-autorelease-pool-recovery

receiving a call etc. For every such event that iOS handles a new autorelease pool is created at the beginning and drained when the event processing is complete. Theoretically there could be any number of nested autorelease pools created by Cocoa..

Autorelease for beginners

http://stackoverflow.com/questions/5860639/autorelease-for-beginners

initWithFrame:frame] vs. [UIButton buttonWithType]

http://stackoverflow.com/questions/6245882/initwithframeframe-vs-uibutton-buttonwithtype

performSelector may cause a leak because its selector is unknown

http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown

Do nothing assume returned object value will be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling..

received memory warning. level 1

http://stackoverflow.com/questions/7088853/received-memory-warning-level-1

Some beginner Objective-C/iPhone questions

http://stackoverflow.com/questions/710568/some-beginner-objective-c-iphone-questions

str str2 . See this answer as well. autorelease adds the receiver to the current NSAutoreleasPool . When the pool is drained usually at the end of the current run loop iteration or when the pool is manually drained the pool calls release on all.. . When the pool is drained usually at the end of the current run loop iteration or when the pool is manually drained the pool calls release on all instances in the pool. If this release drops the retain count to 0 the object is deallocated.. frowned upon on the iPhone because it may cause you to accumulate many unused instances in the pool before it is drained at the end of the run loop iteration. If you can use release instead of autorelease you generally should. Again see the..