Question

如何在另一个背景完成之前使背景不再发挥作用,以及如何在第一个背景完成后使背景变得read。

Answer 1

使用旗帜处理下列类型的活动......

BOOL isYourthreadexecuting = NO;

- (void)beginThread {   
    isYourthreadexecuting = YES;

    [self performSelectorInBackground:@selector(backgroundThread) withObject:nil];
}
- (void)backgroundThread {
    [myClass performLongTask];

    // Done!
    isYourthreadexecuting = NO;
}
- (void)waitForThread {
    if (! isYourthreadexecuting) {
        // Thread completed
        [self callyourmethod];
    }
}

www.un.org/spanish/ecosoc Edited >> Addition under use comment

我建议你使用NSQueue进行多读。

希望。

Answer 2

正如我在评论中指出的那样,你可以使用德国航天局的空中分机。这里是一部示范守则,以证明:

- (IBAction)buttonSerialQ2Pressed:(id)sender 
{
    dispatch_queue_t serialdQueue;
    serialdQueue = dispatch_queue_create("com.mydomain.testbed.serialQ2", NULL);
    dispatch_async(serialdQueue, ^{
        //your code here
        [self method1];
    });
    dispatch_async(serialdQueue, ^{
        //your code here
        [self method2];
    });
    dispatch_async(serialdQueue, ^{
        //your code here
        [self method2];
    });
    dispatch_async(serialdQueue, ^{
        //your code here
        [self method3];
    });
}

-(void)method1
{
    for (int i=0; i<1000; i++) 
    {
        NSLog(@"method1 i: %i", i);
    }
}

-(void)method2
{
    for (int i=0; i<10; i++) 
    {
        NSLog(@"method2 i: %i", i);
    }
}

-(void)method3
{
    for (int i=0; i<100; i++) 
    {
        NSLog(@"method3 i: %i", i);
    }
}

友情链接