objective-c - NSOperation完成

Question

我有一个 NSOperation 在 NSOperationQueue 中运行。 NSOperation 下载一些数据并将其解析为 NSDictionary。我如何知道 NSOperation 何时完成并获取该字典？谢谢。

Answer 1

你也可以使用NSOperation的- (void)setCompletionBlock::

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
    NSLog(@"Doing something...");
}];

[operation setCompletionBlock:^{
    NSLog(@"Doing something once the operation has finished...");
}];

[queue addOperation:operation];

更多细节 here .