ios-終止異步DISPATCH_QUEUE

終止異步DISPATCH_QUEUE

每次開啟一個DISPATCH_QUEUE需要三四分鐘。我需要一個按鈕可以終止隊列。怎麼實現？

dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
        @synchronized(self)
        {
            for (int i = 0; i < (4000); i++) {
                         (Some methods)
            }
        }
});

能否終止或取消此線程？

最佳回答：

使用dispatch_sync阻塞了主線程

你應該用 NSOperationQueue ：

NSOperationQueue *_myQueue; //instance var

_myQueue = [[NSOperationQueue alloc] init]; //init it

_myQueue.suspended = (buttonPressed) ? YES : NO; //toggle it like you need

for (int i = 0; i < (4000); i++) {
   [_queue addOperationWithInvocation:NSInvocation for method to call];  
}