nsoperationqueue | 易学教程

How to get completion block of NSOperationQueue [duplicate]

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问题 This question already has answers here : Get notification when NSOperationQueue finishes all tasks (13 answers) Closed 4 years ago . How to get completion block of NSOperationQueue, here I want to spin activity indicator from start to end of all operation. NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init]; // Set the max number of concurrent operations (threads) [operationQueue setMaxConcurrentOperationCount:3]; [operationQueue addOperations:@[operation, operation1,

NSOperationQueue becomes suspended at random?

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问题 I have an app that uses NSOperationQueue intensively. Sometimes I've noticed that some of the NSOperationQueues would "lock up" or enter a "isSuspended" state randomly even though my code never calls the setSuspended: method. It's impossible to replicate and very hard to debug because whenever I hook the device up to Xcode to debug it, the app would reload and the bug would go away. I added a lot of NSLogs at all possible points that might have a problem and just had to use the app for a few

How to check if NSOperationQueue is finished and if any operation failed?

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问题 I'm trying to parse some XML files in the background so that the UI doesn't freeze. I have to check two things: NSOperationQueue is finished? NSOperation - parsing did fail? I have a class that subclasses NSOperation and a delegate is called if the parsing failed. Operations in the queue are limited to one simultaneously. My problem is that I can't rely on the fact that the failed message is executed before I get the queue did finish message. Sometimes I don't get a failed message before I

How to assure that operations in an OperationQueue are finished one after another

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问题 When performing operations that are dependent on each other OperationQueue could be used to assure they are executed in the correct order. However, would it also be possible to assure that operations are finished one after another? Let's assume a method that is performed asynchronous and takes some time to finish: public func performOperation(_ number: Int, success: @escaping (Int) -> Void)->Void { DispatchQueue(label: "operations").async { print("Operation #\(number) starts") usleep(useconds

Chaining `NSOperation` : Pass result from an operation to the next one

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问题 I've been looking for a way to pass results for chained NSOperation . For example, lets assume we have 3 operations chained: Operation1 to download JSON data from server Operation2 to parse & model JSON received Operation3 to download user images So Op3 would be dependent on Op2, which is dependent on Op1. But I'm looking for way to pass results from Op1 -> Op2, then from Op2 -> Op3 as: [operation1 startWithURL:url]; [operation2 parseJSONfromOp1IntoModel:JSONData]; [operation3

iphone app crash bad access exception DataDetectorsCore processToken

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问题 My iphone app is crashing on ios 7.0 iphone 5s on client device i can't figure out what is wrong with it, I am using crashlytics for crash reporting. Crashlytics reporting crash due to bad access on thread #9 DataDetectorsCore processToken Crashed: NSOperationQueue 0x17023e120 EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x0000000620a51e24 0 DataDetectorsCore processToken + 400 1 DataDetectorsCore _DDScannerHandleState + 344 2 DataDetectorsCore _DDScannerHandleState + 344 3 DataDetectorsCore

文檔翻譯：NSOperationQueue Class Reference

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NSOperationQueue Class Reference NSOperationQueue 類參考本文PDF版本： http://db.tt/6gZkMwJA 。（排版較佳）轉載請註明出處，謝謝。原文網址：http://developer.apple.com/documentation/Cocoa/Reference/NSOperationQueue_class/Reference/Reference.html。(Last updated: 2012-01-09) 本文網址：http://my.oschina.net/KSHime37。(2012-09-15) Overview 概論 The NSOperationQueue class regulates the execution of a set of NSOperation objects. After being 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

How do I start an Asynchronous NSURLConnection inside an NSOperation?

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问题 I want to do an Asynchrous NSURLConnection inside of an NSOperation on a background thread. it is because I'm doing some very expensive operations on the data as they come back. This is a very similar question to what they asked here: How do I do an Asynchronous NSURLConnection inside an NSOperation? but the difference is that I run the connection in another class. Here is my first attempt: In my MainViewController: @property (nonatomic, strong) NSOperationQueue *requestQueue; #pragma mark -

How do I cancel an NSOperation's dependencies?

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问题 I have some NSOperation s in a dependency graph: NSOperation *op1 = ...; NSOperation *op2 = ...; [op2 addDependency:op1]; Here's how I'm running them: NSOperationQueue *queue = [[NSOperationQueue alloc] init]; [queue addOperation:op1]; [queue addOperation:op2]; Now I need to cancel them. How do I ensure that all the NSOperation s in a dependency graph are cancelled, and that no other NSOperation s are cancelled? what I've tried: Calling cancel on either NSOperation doesn't cancel the other

How to use NSOperation and dispatch queue

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问题 I am using NSoperation in Initiating request to server.Pullparser will be called and it will initiate a o/p & i/p stream.In connecitonDidRecievedata I am writing data coming from server to oStream.Imeediately I have to call custom method instead of letting the parser start parsing.How to handle this case.How to handle the ostream call to parser and handle my custom method first then in my custom method I have to call the parser. - (void)run { [gObjAppDelegatePtr displayActivityIndicator];