Question

首先让我描述一下这个场景，然后我将描述这个问题：

我创建了一个使用NSUserNotification

显示用户通知的函数

    -(void)notify:(NSString*) message {

    NSUserNotification *notification = [[NSUserNotification alloc] init];
    notification.title = @"TechHeal";
    notification.informativeText = message;
    //notification.soundName = NSUserNotificationDefaultSoundName;

    [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:notification];    
}

我有一个按钮从服务器获取详细信息。在按钮点击的最后和结尾处，我已调用通知，如下所示：

-(IBAction)get2000Rows:(id)sender{

    [self notify:@"Please wait..."];

    //some code that takes a while to run. like 10 minues :P

    [self notify:@"Thanks for waiting..."];

}

现在，问题是第一个通知“请稍候......”没有显示在按钮点击上，但最后一个通知显示完好。

我也尝试在一个单独的线程中调用Notify函数，但它没有用。（如下所示）

dispatch_queue_t backgroundQueue = dispatch_queue_create("com.mycompany.myqueue", 0);

    dispatch_async(backgroundQueue, ^{

        [self notify:@"Please wait..."];


        dispatch_async(dispatch_get_main_queue(), ^{
        });    
    });

非常感谢您的帮助。提前谢谢。

Answer 1

问题是您在与10 minutes部分代码相同的线程上运行UI代码。所以你应该将那些使用它分开：

-(IBAction)get2000Rows:(id)sender{

    [self notify:@"Please wait..."];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        //some code that takes a while to run. like 10 minues :P

        dispatch_async(dispatch_get_main_queue(), ^(void) {
            [self notify:@"Thanks for waiting..."];
        });
    });
}

Answer 2

您可以通过NSTimer启动计时器以获取重新消息

@interface MyClass ()
{
     NSTimer *timer;
}

-(IBAction)get2000Rows:(id)sender{

       [self notify:@"Please wait..."];


       timer = [NSTimer scheduledTimerWithTimeInterval:10.0f
                                                target:self
                                            selector:@selector(timerClick:)
                                            userInfo:nil
                                             repeats:YES];
}

 - (void)timerClick:(NSTimer *)timer {

        [self notify:@"Thanks for waiting..."];
 }

如何使用NSUserNotification在单击按钮上显示两次用户通知？

2 个答案: