Ios NSTimer'；她打断了

摘要：我正在开发一个iOS应用程序，需要登录到web应用程序中托管的帐户。该帐户是在web应用程序中创建和维护的（通过web界面，而不是iOS应用程序），可以在iOS应用程序开始使用该帐户后更改或删除。因此，我需要定期验证该帐户在web应用程序中是否仍然处于活动状态。我使用NSUserDefaults将deviceID（唯一帐号）存储在iOS应用程序中，并希望将此值与硬件唯一ID一起使用，以确认iOS设备仍与活动帐户关联

我的问题：如果我实施verifyDeviceConfiguration方法，则在用户登录时保持数据新鲜的NSTimer将停止工作

更多详细信息： 登录发生在my WelcomeViewController中，它使用故事板Segue打开显示内容的MainViewController。这是my MainViewController的ViewDidLoad中的一个NSTimer示例：

getWeather = [NSTimer scheduledTimerWithTimeInterval:600 target:self selector:@selector(startFetchingWeather:) userInfo:nil repeats:YES];

-(void)verifyDeviceConfiguration:(NSNotification *)notification
{
    [_uManager validateDevice:[[NSUserDefaults standardUserDefaults] valueForKey:@"deviceID"] deviceNumber:[SKFunctions identifierForVendor1]];
}

-(void)didReceiveValidationConfirmation:(NSArray *)message
{   
    if([message count] == 1)
    {
        for (NSArray *currentMessage in message)
        {
            // fails to validate
            if([currentMessage valueForKey:@"loginError"] != nil)
            {
                // empty device and location
                [[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"deviceID"];

            // request user pair the device again
            NSString *message = @"There was an error validating this device. Please pair the device again.";
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Validation Error" message:message delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [alertView showWithCompletion:^(UIAlertView *alertView, NSInteger buttonIndex)
             {
                 [self viewDidAppear:YES];
             }];

        }
        // successfully validates
        else
        {
            // initiate the seque to the device display
            [self performSegueWithIdentifier:@"registeredUserSegue" sender:nil];
        }
    }
}
else
{
    NSLog(@"This should never happen");


  }
}

-(void)deviceValidationFailedWithError:(NSError *)error
{
    NSLog(@"Device validation error");
}

下面是我用来验证iOS设备是否仍然与有效帐户关联的代码。它位于WelcomeViewController中：

getWeather = [NSTimer scheduledTimerWithTimeInterval:600 target:self selector:@selector(startFetchingWeather:) userInfo:nil repeats:YES];

-(void)verifyDeviceConfiguration:(NSNotification *)notification
{
    [_uManager validateDevice:[[NSUserDefaults standardUserDefaults] valueForKey:@"deviceID"] deviceNumber:[SKFunctions identifierForVendor1]];
}

-(void)didReceiveValidationConfirmation:(NSArray *)message
{   
    if([message count] == 1)
    {
        for (NSArray *currentMessage in message)
        {
            // fails to validate
            if([currentMessage valueForKey:@"loginError"] != nil)
            {
                // empty device and location
                [[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"deviceID"];

            // request user pair the device again
            NSString *message = @"There was an error validating this device. Please pair the device again.";
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Validation Error" message:message delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [alertView showWithCompletion:^(UIAlertView *alertView, NSInteger buttonIndex)
             {
                 [self viewDidAppear:YES];
             }];

        }
        // successfully validates
        else
        {
            // initiate the seque to the device display
            [self performSegueWithIdentifier:@"registeredUserSegue" sender:nil];
        }
    }
}
else
{
    NSLog(@"This should never happen");


  }
}

-(void)deviceValidationFailedWithError:(NSError *)error
{
    NSLog(@"Device validation error");
}

还有一些代码使用NSURLConnection从提供帐户确认的服务器获取响应。该守则如下：

-(void)validateDevice:(NSNumber *)deviceID deviceNumber:(NSString *)deviceNumber
{
    [self.communicator validateDevice:deviceID deviceNumber:deviceNumber];
}

-(void)receivedValidationConfirmationJSON:(NSData *)objectNotation
{
    NSString *decodedString = [[NSString alloc] initWithData:objectNotation encoding:NSUTF8StringEncoding];
    NSLog(@"Decoded Validation Confirmation: %@", decodedString);

    NSError *error = nil;
    NSArray *validationMessage = [SKLoginBuilder deviceValidationConfirmationJSON:objectNotation error:&error];

    if(error != nil) {
        [self.delegate deviceValidationFailedWithError:error];
    } else {
        [self.delegate didReceiveValidationConfirmation:validationMessage];
    }
}    

-(void)validateDevice:(NSNumber *)deviceID deviceNumber:(NSString *)deviceNumber
{
    NSString *urlAsString = [NSString stringWithFormat:@"%@/%@&d=%@&n=%@&apiKey=%@", API_URL, @"validation", deviceID, deviceNumber, API_KEY_LOGIN];
    NSLog(@"Device Validation URL: %@", urlAsString);

    BOOL validUrl = [SKFunctions validateURL:urlAsString];

    if(validUrl)
    {
        NSURL *url = [[NSURL alloc] initWithString:urlAsString];

        if([NSURL URLWithString:urlAsString] != nil)
        {
            [NSURLConnection sendAsynchronousRequest:[[NSURLRequest alloc] initWithURL:url] queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                if(error) {
                    [self.delegate deviceValidationFailedWithError:error];
                } else {
                    [self.delegate receivedValidationConfirmationJSON:data];
                }
            }];
        }
    }
    else
    {
        //error handing for poorly formatted url
        UIAlertView *urlFailure = [[UIAlertView alloc] initWithTitle:@"Error" message:@"There was an error validating your tablet. Please logout and login again." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil ];
        [urlFailure show];
        }
    }

如果我关闭verifyDeviceConfiguration，一切正常…NSTimer将启动，数据将刷新。如果我打开verifyDeviceConfiguration，MainViewController将加载，它将填充数据一次（直接调用数据的初始加载，不使用NSTimer），并且NSTimer将不会触发和刷新数据

最后，我会处理NSLog语句

---

想法？谢谢。

我在学习和生活！我在以下特定事件中使计时器无效，然后再次尝试运行计时器。实际上，我想要/需要的是暂停计时器……我知道这是不可能做到的。所以，我采取了不同的方法，一切都很好

[getTime invalidate];

谢谢