使用 NSOperationQueue 下载多个视频
我有以下几行代码可以从我的应用程序开始多次下载。问题是，NSInitationQueue 没有调用选择器方法，即 downloadMyVideos。
请问有人可以告诉我以下代码到底有什么问题吗？
- (void)viewWillAppear:(BOOL)animated
{
[operationQueue cancelAllOperations];
operationQueue = [[NSOperationQueue alloc] init];
[operationQueue setSuspended:YES];
indexOperation = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(downloadMyVideo) object:nil];
[operationQueue addOperation:indexOperation];
}
I have code following lines to start multiple downloads from my application. The problem is, the NSInvocationQueue is not calling selector method, i.e. downloadMyVideos.
Can please anyone let me know, exactly what is wrong with following code?
- (void)viewWillAppear:(BOOL)animated
{
[operationQueue cancelAllOperations];
operationQueue = [[NSOperationQueue alloc] init];
[operationQueue setSuspended:YES];
indexOperation = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(downloadMyVideo) object:nil];
[operationQueue addOperation:indexOperation];
}
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评论（1）
您已暂停队列。
添加到挂起队列的操作不会运行。这可能是你的问题，除非你在其他地方开始排队。
You've suspended your queue.
Operations that you add to a suspended queue are not run. That could be your problem, unless you are starting the queue elsewhere.