2014/10/15 下午 10:12:22

iphone Programming Glossary: operations

http://stackoverflow.com/questions/1018369/accessing-web-service-from-iphone

question This is much simpler to do than on most mobile devices and more robust in my opinion . Best practices use operations NSOperation to handle the requests this is the best way I have found to reduce the complexities of threading with web calls..

Get notification when NSOperationQueue finishes all tasks

http://stackoverflow.com/questions/1049001/get-notification-when-nsoperationqueue-finishes-all-tasks

this I can't send notifications from my NSOperation s because I don't know which one is going to be last and queue operations might not be empty yet or worse repopulated when notification is received. iphone asynchronous queue notifications nsoperation.. received. iphone asynchronous queue notifications nsoperation share improve this question Use KVO to observe the operations property of your queue then you can tell if your queue has completed by checking for queue.operations count 0 . When you.. to observe the operations property of your queue then you can tell if your queue has completed by checking for queue.operations count 0 . When you setup your queue do this self.queue addObserver self forKeyPath @ operations options 0 context NULL Then..

How to programmatically send SMS on the iPhone?

http://stackoverflow.com/questions/10848/how-to-programmatically-send-sms-on-the-iphone

up now you'll get 3 200 RB points Apple has restrictions for automated or even partially automated SMS and dialing operations. Imagine if the game instead dialed 911 at a particular time of day Your best bet is to setup an intermediate server on..

What's the difference between NSNumber and NSInteger?

http://stackoverflow.com/questions/1285098/whats-the-difference-between-nsnumber-and-nsinteger

an array with a negative number of elements. When the coder knows it's unsigned he she has more freedom to perform operations that might be unreliable in the signed case including bitwise operations such as shifting. This blog post talks more about.. unsigned he she has more freedom to perform operations that might be unreliable in the signed case including bitwise operations such as shifting. This blog post talks more about signed vs unsigned. My guess about CGFloat vs NSFloat which doesn't exist..

Drawing formulas with Quartz 2d

http://stackoverflow.com/questions/2907045/drawing-formulas-with-quartz-2d

layers to construct the sub elements of a parsed equation. The equations are constructed hierarchically and the operations that compose them are laid out as such. Each operation is contained within its parent operation's layer and laid out following.. layer and laid out following the rules of that particular operation. For rendering the visual elements of the operations within an equation I used Quartz to draw lines symbols etc. but most of the drawing was simply text drawn within a CALayer..

NSThread vs. NSOperationQueue vs. ??? on the iPhone

http://stackoverflow.com/questions/3041837/nsthread-vs-nsoperationqueue-vs-on-the-iphone

matter how you create your NSOperation you can just throw it into an operation queue when you are ready to run it. The operations are designed to work as either objects you put into a queue or you can run them as standalone asynchronous methods if you.. once. NSOperationQueue is smart enough to only create about as many threads as there are cores queuing the remaining operations. With NSThread creating 100 threads to cache 100 images is probably overkill and somewhat inefficient. You may want to cancel..

Obtaining Specific ABSource from ABAddressBook in iOS 4+

http://stackoverflow.com/questions/4679641/obtaining-specific-absource-from-abaddressbook-in-ios-4

4 provides new API that allows one to select a specific ABSource from the ABAddressBook. This may be useful as some operations e.g. creating an ABGroup are not supported in some sources i.e. Exchange . Not all source types support groups more conspicuously..

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

is not entirely correct as Tom's answer shows. You can allow the run loop to come to completion in the middle of operations performed on the main thread. However this still may reduce the responsiveness of your application. In general it is recommended..

Convert decimal to fraction in Objective-C?

http://stackoverflow.com/questions/5552537/convert-decimal-to-fraction-in-objective-c

c xcode formatting share improve this question Objective C uses pure C for basically all primitive mathematical operations. This being said you'll find all necessary information along with C code in the answers of this other question How to convert..

Are the Core Image filters in iOS 5.0 fast enough for realtime video processing?

http://stackoverflow.com/questions/6625888/are-the-core-image-filters-in-ios-5-0-fast-enough-for-realtime-video-processing

This is about the simplest Core Image filter case you can set up so performance will certainly vary with more complex operations. This would seem to indicate that Core Image cannot do live processing fast enough to match the iPhone's camera rate on..

Exception Types in iOS crash logs

http://stackoverflow.com/questions/7446655/exception-types-in-ios-crash-logs

or the alignment is invalid. SIGFPE Floating point exception Invalid arithmetic operation. Can be related to integer operations despite the name. SIGPIPE Broken pipe. SIGILL Illegal processor instruction. SIGTRAP Debugger related SIGABRT Program crash..

iCloud basics and code sample [closed]

http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample

You can open them create them move them copy them read and write from them delete them or any of the other operations you might want to do. The only differences between local files and directories and iCloud files and directories is the URL..

Does AFNetworking have backgrounding support?

http://stackoverflow.com/questions/7800614/does-afnetworking-have-backgrounding-support

How to achieve concurrent task through NSOperation? [closed]

http://stackoverflow.com/questions/12910479/how-to-achieve-concurrent-task-through-nsoperation

adding it to an operation queue. See the Concurrency Programming Guide section Concurrent Versus Non concurrent Operations Also Please read Managing Concurrency with NSOperation You typically execute operations by adding them to an operation queue.. added to a queue an operation remains in that queue until it is explicitly canceled or finishes executing its task. Operations within the queue but not yet executing are themselves organized according to priority levels and inter operation object..

Asynchronous methods in NSOperation

http://stackoverflow.com/questions/1596160/asynchronous-methods-in-nsoperation

fbconnect share improve this question Dave Dribin describes how to do such thing in his blog post Concurrent Operations Demystified . His example shows async NSURLConnection but should be almost the same with FBConnect share improve this answer..

Implementing iphone's copy/paste controls on a custom view / uiview subclass

http://stackoverflow.com/questions/2110731/implementing-iphones-copy-paste-controls-on-a-custom-view-uiview-subclass

the Event Handling section of the iPhone Application Programming Guide specifically the section on Copy Cut and Paste Operations it should be possible to provide copy cut and or paste operations from a custom view. So I've sub classed UILabel with the..

Interlocked operations in iOS?

http://stackoverflow.com/questions/4862308/interlocked-operations-in-ios

Will my iPhone app take a performance hit if I use Objective-C for low level code?

http://stackoverflow.com/questions/926728/will-my-iphone-app-take-a-performance-hit-if-i-use-objective-c-for-low-level-cod

for performance of various Objective C method calls versus C and C in his post Performance Comparisons of Common Operations . Also this post by Savoy Software is an interesting read when it comes to tuning the performance of an iPhone application..