Question

如何获得NSOperationQueue的完成块，这里我想从所有操作的开始到结束旋转活动指示器。

NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];
// Set the max number of concurrent operations (threads)
[operationQueue setMaxConcurrentOperationCount:3];
[operationQueue addOperations:@[operation, operation1, operation3,...] waitUntilFinished:NO];

感谢。

Answer 1

您需要实施KVO才能观察。

转到addDependency进行操作，这将有助于您完成＆＃34; isFinished键＆＃34;操作，并解决所有依赖关系，它执行KVN。之后，您可以运行自旋活动指标的逻辑。你也可以写一个块。请检查以下代码：

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSBlockOperation *operationObj = [NSBlockOperation blockOperationWithBlock:^{
    NSLog(@"Show your activity...");
}];

[operationObj setCompletionBlock:^{
    NSLog(@"Operation has finished...");
}];

[queue addOperation: operationObj];

检查以下参考URL

Get notification when NSOperationQueue finishes all tasks

When will completionBlock be called for dependencies in NSOperation

如何获得NSOperationQueue的完成块

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