ios - 如何在后台线程中运行 NSTimer

Question

我想使用 BackGround thread 运行 NSTimer 因为我已经写了下面的代码但是我的 NSTimer 方法没有被调用!

有人能帮帮我吗

- (void)viewDidLoad {
       [super viewDidLoad];
       // Do any additional setup after loading the view.
        NSOperationQueue* operationQueue = [[NSOperationQueue alloc] init];
        [operationQueue addOperationWithBlock:^{
        // Perform long-running tasks without blocking main thread

        [NSTimer scheduledTimerWithTimeInterval:2
                                                 target:self
                                               selector:@selector(targetMethod)
                                               userInfo:nil
                                                repeats:YES];
          }];
}

-(void)targetMethod{
         NSLog(@"Timer Called");
}

Answer 1

您可以为后台线程使用 GCD 调度队列 :=

 dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void)
                   {
                       NSTimer *timer = [NSTimer timerWithTimeInterval:0.5
                                                                target:self
                                                              selector:@selector(timerFired)
                                                              userInfo:nil repeats:YES];
                       [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
                       dispatch_async(dispatch_get_main_queue(), ^(void)
                                      {
                                      });
                   });